EP1528961A1 - Verfahren zur reinigung von apparaten, in welchen (meth)acrylsäure enthaltende organische lösungsmittel behandelt und/oder erzeugt wurden - Google Patents
Verfahren zur reinigung von apparaten, in welchen (meth)acrylsäure enthaltende organische lösungsmittel behandelt und/oder erzeugt wurdenInfo
- Publication number
- EP1528961A1 EP1528961A1 EP03790831A EP03790831A EP1528961A1 EP 1528961 A1 EP1528961 A1 EP 1528961A1 EP 03790831 A EP03790831 A EP 03790831A EP 03790831 A EP03790831 A EP 03790831A EP 1528961 A1 EP1528961 A1 EP 1528961A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acrylic acid
- column
- meth
- water
- aqueous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000003960 organic solvent Substances 0.000 title claims abstract description 37
- 238000004140 cleaning Methods 0.000 title claims abstract description 9
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- 238000001256 steam distillation Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 239000007788 liquid Substances 0.000 claims description 26
- 238000010521 absorption reaction Methods 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000012808 vapor phase Substances 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000012487 rinsing solution Substances 0.000 claims description 9
- 238000003795 desorption Methods 0.000 claims description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 7
- 239000008346 aqueous phase Substances 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 5
- 239000012074 organic phase Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 34
- 238000009835 boiling Methods 0.000 description 24
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 22
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 22
- 239000000203 mixture Substances 0.000 description 22
- 239000002904 solvent Substances 0.000 description 19
- 239000012071 phase Substances 0.000 description 15
- 238000000926 separation method Methods 0.000 description 15
- 230000003647 oxidation Effects 0.000 description 13
- 238000007254 oxidation reaction Methods 0.000 description 13
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 12
- 239000012495 reaction gas Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 9
- 239000004305 biphenyl Substances 0.000 description 6
- 235000010290 biphenyl Nutrition 0.000 description 6
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 6
- MHCVCKDNQYMGEX-UHFFFAOYSA-N 1,1'-biphenyl;phenoxybenzene Chemical group C1=CC=CC=C1C1=CC=CC=C1.C=1C=CC=CC=1OC1=CC=CC=C1 MHCVCKDNQYMGEX-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 5
- 125000006267 biphenyl group Chemical group 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 5
- 238000004821 distillation Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N Propene Chemical compound CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- RRZLSYQXSYWRDG-UHFFFAOYSA-N 1,2-dimethylcyclohexa-3,5-diene-1,2-dicarboxylic acid Chemical compound OC(=O)C1(C)C=CC=CC1(C)C(O)=O RRZLSYQXSYWRDG-UHFFFAOYSA-N 0.000 description 2
- HGINCPLSRVDWNT-UHFFFAOYSA-N Acrolein Chemical compound C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- AMIMRNSIRUDHCM-UHFFFAOYSA-N Isopropylaldehyde Chemical compound CC(C)C=O AMIMRNSIRUDHCM-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- -1 alkanols Chemical class 0.000 description 2
- 239000003637 basic solution Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 239000003701 inert diluent Substances 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- WJFKNYWRSNBZNX-UHFFFAOYSA-N 10H-phenothiazine Chemical compound C1=CC=C2NC3=CC=CC=C3SC2=C1 WJFKNYWRSNBZNX-UHFFFAOYSA-N 0.000 description 1
- STNJBCKSHOAVAJ-UHFFFAOYSA-N Methacrolein Chemical compound CC(=C)C=O STNJBCKSHOAVAJ-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical class OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008953 bacterial degradation Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229950000688 phenothiazine Drugs 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000008237 rinsing water Substances 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0323—Arrangements specially designed for simultaneous and parallel cleaning of a plurality of conduits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0327—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid the fluid being in the form of a mist
Definitions
- the present invention relates to a method for cleaning apparatus in which organic solvents containing (meth) acrylic acid have been treated and / or produced and which contain fouling and / or polymer and residues of the organic solvent formed in an undesirable manner.
- (Meth) acrylic acid is particularly useful for the preparation of polymers for a wide variety of applications, e.g. Use as an adhesive, important.
- (Meth) acrylic acid itself is primarily obtainable by heterogeneously catalyzed gas-phase oxidation of alkanes, alkanols, alkenes or alkenals which contain 3 or 4 carbon atoms.
- These starting gases are usually diluted with inert gases such as nitrogen, CO, saturated hydrocarbons and / or water vapor, in a mixture with oxygen at elevated temperatures (usually 200 to 400 ° C) and optionally increased pressure via transition metals (e.g. Mo, V , W and / or Fe) mixed oxide catalysts passed and oxidatively converted into (meth) acrylic acid (see, for example, DE-A 4405059, EP-A 253409, EP-A 92097, DE-A 4431957 and DE-A 4431949).
- inert gases such as nitrogen, CO, saturated hydrocarbons and / or water vapor
- the (meth) acrylic acid is separated off by means of absorptive, extractive, desorptive and / or rectificative separation processes with the use of organic solvents in a wide variety of apparatus.
- the (meth) acrylic acid formed is initially absorbed from the reaction gas mixture of the gas phase oxidation, optionally after indirect and / or direct cooling with an optionally organic solvent, into a suitable absorbent (e.g. water or a preferably high-boiling organic solvent).
- a suitable absorbent e.g. water or a preferably high-boiling organic solvent.
- a (meth) acrylic acid of high purity is then usually obtained by desorptive, extractive and / or rectificative separation of the absorbate.
- DE-A 4436243 relates, for example, to a process for separating (meth) acrylic acid from the reaction gas mixture of catalytic gas phase oxidation by countercurrent absorption with a high-boiling inert organic liquid, in which the reaction gas mixture is separated in an absorption column to the descending high-boiling inert hydrophobic organic liquid
- Countercurrent leads, a rectification process superimposed on the absorption process taking place naturally in the absorption column, by withdrawing from the absorption column an amount of energy which goes beyond its natural energy release due to its contact with the ambient temperature and from (meth) acrylic acid and that Absorbent (care) as the main constituent liquid drain of the absorption column (absorbate) which rectically separates (meth) acrylic acid overhead.
- DE-A 4436243 prefers all those organic liquids whose boiling point at normal pressure (1 atm) is above the boiling temperature of (meth) acrylic acid and which consists of at least 70% by weight such molecules exist that do not contain an external polar group and are therefore not able to form hydrogen bonds, for example.
- EP-A 117146 relates to a process for separating acrylic acid from the reaction gas mixture of catalytic gas phase oxidation by absorbing the acrylic acid in an absorption column operated with water. By extraction with ethyl acetate the acrylic acid is separated from the liquid drain and rectificatively obtained from the acrylic acid extract via the sump.
- DE-A 19606877 discloses initially cooling the reaction gas mixture containing acrylic acid from the gas phase oxidation of propene and / or propane by partial evaporation of a high-boiling organic solvent in a direct condenser K9.
- the high-boiling secondary components of the reaction gas mixture condense into the non-evaporated solvent.
- a partial stream from the direct condenser (quench) K9 is subjected to a solvent distillation, the solvent being distilled over and the high-boiling secondary components remaining.
- the latter can be further thickened and disposed of, e.g. be burned.
- a column K10 which is preferably a valve plate column or a combination of valve plates (top) and a few dual flow plates (in the lowest region of the column), is charged with the same solvent from above, while the solvent evaporated in K9 and the gaseous reaction product are introduced into column K10 from below and then cooled to absorption temperature.
- the cooling is expediently carried out by means of the return line which is removed from the absorption column and which passes through external cooling circuits. After the reaction gas stream has cooled to the absorption temperature, the actual absorption takes place. The acrylic acid contained in the reaction gas and some of the low-boiling secondary components are absorbed.
- reaction gas which has not been absorbed, is further cooled in order to condense the comparatively difficult-to-condense secondary components and water vapor contained therein and to separate it off as acid water.
- the gas stream then remaining is advantageously partially disposed of and partially (recycle gas) is returned as a diluent gas to the gas phase oxidation or used for stripping.
- the solvent loaded with acrylic acid and secondary components is drawn off from the bottom of column K10 and fed to a desorption column K20.
- the low boilers are stripped from the loaded solvent in the desorption column K20 with part of the cycle gas. Since larger amounts of acrylic acid are also stripped, this stream is expediently recirculated into the direct condenser K9 or fed to the lower part of the column K10 below the fresh solvent feed.
- the low boilers contained in the cycle gas used as stripping gas are removed before it enters K20. This is advantageous in terms of process technology in that the stripping gas is purified with worked-up solvent from column K30 described below in a countercurrent washing column K19.
- an almost low-boiler free solvent stream loaded with acrylic acid is drawn off from the bottom of the desorption column K20 and fed to the distillation column K30, which is preferably a dual-flow tray column.
- the high-boiling solvent and secondary components such as, for example, condense into the bottom of column K30. Maleic anhydride.
- this low-boiling fraction is expediently reduced by extending the buoyancy part of column K30 to such an extent that the acrylic acid is withdrawn from the column as a side draw can be deducted.
- the solvent which is essentially free of low boilers and acrylic acid and is withdrawn from the bottom of the rectification column K30 is fed to the countercurrent wash column K19 in order, as already mentioned above, to remove the low boilers from the stripping gas stream which flows into the desorption column K20 leads to wash.
- the solvent, which is almost free of acrylic acid is then fed back into the absorption column K10, except for a small partial stream.
- the acidic water, which still contains acrylic acid in solution, is treated with the small partial flow of the solvent, which is almost free of acrylic acid. In this acid water extraction, part of the acrylic acid is recovered from the acid water, while at the same time the acid water extracts all polar components from the partial solvent stream. The remaining acid water can be pre-evaporated and then burned.
- Suitable high-boiling organic solvents for standard acrylic acid separation especially mixtures of diphenyl ether (70 to 75% by weight) and diphenyl (25 to 30% by weight).
- a high-boiling hydrophobic organic absorption liquid which is particularly advantageous in this process is a mixture consisting of a mixture of 70 to 75% by weight of diphenyl ether and 25 to 30% by weight Diphenyl, and, based on this mixture, 0.1 to 25 wt .-% o-dimethylphthalate. In principle, however, all other high-boiling organic liquids recommended in EP-A 722926 can also be used.
- These devices are, in particular, rectification columns, absorption columns, desorption columns and extraction columns.
- Columns with a wide variety of internals are generally used as such columns.
- Such internals are e.g. Soils (such as dual flow trays, sieve trays, valve trays, Thormann trays, tunnel trays and / or bubble trays), packings, Raschig rings and / or Pall rings.
- Evaporators act as they are indispensable for the thermal separation processes and e.g. are described in EP-A 854120, or capacitors or mixing devices.
- the disadvantage is that (meth) acrylic acid even in the presence of polymerization inhibitors such as N-oxyl radicals, phenothiazine, monomethyl ether of hydroquinone, hydroquinone, etc., particularly in the liquid phase, have a pronounced tendency to polymerize. This is particularly noticeable in the thermal separation processes in which the (meth) acrylic acid monomers are exposed to comparatively high temperature loads.
- polymerization inhibitors such as N-oxyl radicals, phenothiazine, monomethyl ether of hydroquinone, hydroquinone, etc.
- DE-A 10213027 therefore recommends that from the fouling and / or polymer, the residues of the organic solvent contained therein are first extracted from the same by means of (meth) acrylic acid and the mixture of (meth) acrylic acid and residues of the organic solvent in the process the separation of the (meth) acrylic acid from the reaction gas mixture of the gas phase oxidation.
- a disadvantage of this procedure is that (meth) acrylic acid which has already been separated off is mixed again with organic solvent.
- DE-A 10213027 recommends that if the apparatus to be cleaned is a column, a gas (e.g. air or nitrogen or water vapor) is passed through the column in countercurrent to the flushing liquid then descending, but water vapor is only used as the same recommended if the rinsing liquid itself is watery. However, the latter is only possible after extraction with (meth) acrylic acid, i.e. after removal of the residues of the organic solvent.
- a gas e.g. air or nitrogen or water vapor
- a disadvantage of the above-mentioned procedure is that the steam distillation and the rinsing with water are carried out spatially separately.
- a process for cleaning apparatus in which organic solvents containing (meth) acrylic acid have been treated and / or produced and which contain fouling and / or polymer and residues of the organic solvent formed in an undesired manner has been found, which is characterized in that that the contents of the apparatus are subjected to steam distillation, the vapor phase removed from the apparatus is condensed and the resulting condensate is separated into an aqueous phase and an organic phase containing residues of the organic solvent.
- Steam distillation of the contents of the apparatus should be understood to mean all processes in which on the one hand water vapor is generated in the apparatus to be cleaned and / or water vapor is supplied to the apparatus to be cleaned and on the other hand vapor phase is removed from the apparatus to be cleaned.
- e.g. proceed as follows.
- the apparatus which is normally emptied except for the fouling and / or polymer formed and residues of the organic solvent and small amounts of (meth) acrylic acid is washed with water or an aqueous basic solution (i.e. with an aqueous rinsing liquid), e.g. an aqueous alkali hydroxide solution (preferably sodium hydroxide and / or potassium hydroxide), filled (particularly in the case of columns, as a rule, only part of the filling is carried out; the amount is normally measured so that evaporators and pumps can be operated), which can be preheated.
- the aqueous phase is e.g. brought to a boil by suitable heat exchangers and thus to the formation of water vapor and / or heated water vapor is led into the apparatus.
- the organic phase essentially consists of the organic solvent, which, for example, can be returned to the separation of the (meth) acrylic acid from the product gas mixture of the gas phase oxidation (for example, in the case of the standard acrylic acid separation, it can be returned to the absorption column K10 below the supply of fresh absorbent , which reduces solvent losses).
- the aqueous phase consists essentially of water.
- the aqueous phase can be recycled, for example as reflux in the column) and / or the generation of steam will be supplied from outside the apparatus to be cleaned ,
- the filling quantity is the quantity that would be required to completely fill the emptied apparatus with water.
- an aqueous rinsing liquid used in the process according to the invention can also be taken continuously from the apparatus to be cleaned and, if necessary after heating outside the apparatus to be cleaned (for example in a suitable heat exchanger), returned to the apparatus to be cleaned and thus continuously through the apparatus to be cleaned be circulated. Pumps are used to promote this.
- a circulation preferably supplied water vapor and the aqueous rinsing liquid used are passed in countercurrent through the apparatus to be cleaned.
- water vapor is supplied to the apparatus to be cleaned when carrying out the process according to the invention, its pressure, particularly if the apparatus to be cleaned is a separation column, is expediently from 1.0 to 16 bar, frequently from 1.1 to 4 bar.
- Saturated steam is preferably used as water vapor. Saturated steam means that the water partial pressure makes up at least 99% of the total pressure.
- aqueous alkali and / or alkaline earth hydroxide and / or oxide solutions especially, as already mentioned, the aqueous solutions of NaOH, KOH and Ca (0H).
- the aqueous solution has a dissolved salt content of from 0.01 to 30% by weight, preferably from 0.5 to 10% by weight.
- the aforementioned basic aqueous alkali solution in a ratio of> 0: 1 to 2: 1 becomes an essentially pH-neutral (based on its aqueous solution) alkali and / or added alkaline earth metal salt.
- the sulfates, acetates, oxalates, carbonates corresponding to the hydroxide / oxide compounds are particularly suitable for this. Hydrogen sulfates, hydrogen carbonates and / or other salts.
- Such an addition can further improve the solution behavior of the basic solution for the process according to the invention.
- aqueous rinsing liquid is expediently used in the process according to the invention and the point in time at which the vapor phase removed from the apparatus to be cleaned is substantially or completely free of organic substances is reached, the aqueous rinsing liquid is drained off and disposed of as described in DE-A 10211273 and DE-A 10213027.
- an aqueous rinsing liquid used in this way can be renewed from time to time as part of the implementation of the method according to the invention and / or exchanged for another aqueous rinsing liquid.
- it advantageously has a boiling temperature within the apparatus to be cleaned.
- the apparatus to be cleaned is generally rinsed with water / (if alkali is also used beforehand, rinsing is carried out without alkali).
- rinsing with aqueous basic rinsing liquid can be carried out beforehand, as described in DE-A 10211273 and DE-A 10213027, without steam distillation being carried out at the same time. If necessary, this rinsing liquid also has an elevated temperature.
- the process according to the invention can be carried out either at regular time intervals or after a specific polymer formation has been established.
- the process according to the invention is particularly suitable when the boiling point of the organic solvent is above the boiling point of water (both at 1 atm). That is, it is particularly suitable when it is a matter of a high-boiling, preferably hydrophobic, organic absorption liquid, as recommended in DE-A 2136396 and in DE-A 4308087.
- a high-boiling, preferably hydrophobic, organic absorption liquid as recommended in DE-A 2136396 and in DE-A 4308087.
- These are essentially liquids whose boiling point at normal pressure (1 atm) is above 160 ° C. Examples include middle oil fractions from paraffin distillation, diphenyl ether, diphenyl or mixtures of the aforementioned liquids, such as a mixture of 70 to 75% by weight of diphenyl ether and 25 to 30% by weight of diphenyl.
- the (meth) acrylic acid content of the organic solvent containing (meth) acrylic acid, as it was treated or produced in the apparatus to be cleaned according to the invention can be> 5% by weight, or> 10% by weight, or> 25% by weight. -%, or> 35% by weight, or
- this content is at values ⁇ 90% by weight, or
- Suitable apparatuses to be cleaned according to the invention are all apparatuses already mentioned in the document. This applies in particular if they are made of stainless steel with the material number 1.4541 or 1.4571 (cf. standard DIN EN 10020).
- the method according to the invention can be applied to any form of separation column (absorption, desorption, extraction and rectification columns). Soil columns,
- the process according to the invention can be carried out in the apparatus to be cleaned under reduced pressure (e.g. 10 to 100 mbar), increased pressure or under other conditions.
- reduced pressure e.g. 10 to 100 mbar
- the process according to the invention is expediently carried out by conveying an aqueous basic rinsing solution through the tray column from top to bottom and in countercurrent to the rinsing solution, water vapor is passed through the tray column in such a way that the Difference between the pressure in the vapor phase immediately below the bottom tray of the tray column and the pressure in the vapor phase immediately above the top tray, divided by the number of trays in the column at least 0.5 mbar, often 0.5 to 6 mbar or 1 to 5 mbar, per floor.
- the bubble layers produced in this way have an improved cleaning effect.
- the rinsing solution is expediently continuously removed from the bottom of the column and fed back to the bottom column via the return line. Their temperature is at their boiling point.
- the pressure in the vapor phase "immediately" below the bottom or top of the bottom column of the tray column should mean that the measuring point should not be more than 15 cm below the bottom and at least 25 cm above the top.
- the pressure measurement can take place, for example, via open drilling, in which a transmitter is connected to the column via a wall connection.
- the advantage of the method according to the invention lies in the fact that the organic load of an aqueous rinsing solution which is also used or subsequently used is so low that it can be fed directly to a sewage treatment plant for the purpose of aerobic degradation of the organic load.
- the organic solvent content is usually well below 100 ppm by weight. If you then rinse with water, the resulting wash water can usually be released directly into the natural environment.
- 600 g of an aqueous sodium hydroxide solution which contained dissolved polyacrylic acid and a small amount of a mixture (called diphyl) of diphenyl and diphenyl ether were placed in a 1 1 four-necked flask [TJ with bottom valve, mechanical stirrer, gas inlet tube, thermometer and distillation bridge.
- 600 g of water were placed in a second 1 1 four-necked flask 2 with a dropping funnel (steam generator). The water in the four-necked flask 2 was heated and the water vapor passed through the rinse liquor through the gas inlet pipe. The evaporated water was replenished via the dropping funnel.
- the fill levels of both four-necked flasks were kept constant.
- 6000 g of the rinsing liquor from Example 1 were placed in a 10 1 double-jacketed flat-surface reaction vessel with a bottom valve, magnetically coupled stirrer, gas inlet tube, thermometer and distillation bridge with a coil cooler.
- the reaction vessel was heated to 110 ° C. with heat transfer oil.
- 1000 g of water were placed in a 2 1 four-necked flask with a dropping funnel (steam generator). The water was heated to boiling and the water vapor was passed through the rinse liquor through the gas inlet tube. Water was metered into the steam generator via the dropping funnel. The fill levels of the two containers were kept constant.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Detergent Compositions (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10237061 | 2002-08-09 | ||
| DE10237061A DE10237061A1 (de) | 2002-08-09 | 2002-08-09 | Verfahren zur Reinigung von Apparaten, in welchen(Meth)acrylsäure enthaltende organische Lösungsmittel behandelt und/oder erzeugt wurden |
| PCT/EP2003/008398 WO2004020116A1 (de) | 2002-08-09 | 2003-07-30 | Verfahren zur reinigung von apparaten, in welchen (meth)acrylsäure enthaltende organische lösungsmittel behandelt und/oder erzeugt wurden |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1528961A1 true EP1528961A1 (de) | 2005-05-11 |
| EP1528961B1 EP1528961B1 (de) | 2006-05-03 |
Family
ID=30469717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03790831A Expired - Lifetime EP1528961B1 (de) | 2002-08-09 | 2003-07-30 | Verfahren zur reinigung von apparaten, in welchen (meth)acrylsäure enthaltende organische lösungsmittel behandelt und/oder erzeugt wurden |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US7287534B2 (de) |
| EP (1) | EP1528961B1 (de) |
| CN (1) | CN100335184C (de) |
| AT (1) | ATE324948T1 (de) |
| AU (1) | AU2003260338A1 (de) |
| BR (1) | BR0313067B1 (de) |
| DE (2) | DE10237061A1 (de) |
| MY (1) | MY136884A (de) |
| WO (1) | WO2004020116A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4231407B2 (ja) | 2001-09-24 | 2009-02-25 | アイエムエックス ラブズ インコーポレイテッド | 化粧品カスタム調合用の装置および方法 |
| DE10211273A1 (de) * | 2002-03-13 | 2003-03-06 | Basf Ag | Verfahren zur Reinigung von Bodenkolonnen, die zur rektifikativen Behandlung von (Meth)acrylsäure und/oder deren Ester enthaltenden Flüssigkeiten verwendet worden waren |
| JP2004216206A (ja) * | 2003-01-09 | 2004-08-05 | Mitsubishi Rayon Co Ltd | 粘着性物質または粘着性物質を含む廃液の除去方法 |
| CN102740941A (zh) | 2010-02-03 | 2012-10-17 | 埃克森美孚上游研究公司 | 使用冷却液从工艺气流中去除可凝固的气体组分的系统和方法 |
| CN106964594B (zh) * | 2017-05-02 | 2019-04-12 | 中国工程物理研究院核物理与化学研究所 | 水精馏塔的在线清洗方法及清洗剂和清洗装置 |
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| DE3461782D1 (en) | 1983-02-22 | 1987-02-05 | Halcon Sd Group Inc | Conversion of propane to acrylic acid |
| US4904309A (en) * | 1986-06-06 | 1990-02-27 | Kanegafuchi Chemical Industry Co., Ltd. | Chemical cleaning method of the interior of polymerization reactor |
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| DE4405059A1 (de) * | 1994-02-17 | 1995-08-24 | Basf Ag | Multimetalloxidmassen |
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-
2002
- 2002-08-09 DE DE10237061A patent/DE10237061A1/de not_active Withdrawn
-
2003
- 2003-05-29 US US10/447,227 patent/US7287534B2/en not_active Expired - Fee Related
- 2003-07-15 MY MYPI20032640A patent/MY136884A/en unknown
- 2003-07-30 CN CNB038189909A patent/CN100335184C/zh not_active Expired - Fee Related
- 2003-07-30 BR BRPI0313067-3A patent/BR0313067B1/pt not_active IP Right Cessation
- 2003-07-30 WO PCT/EP2003/008398 patent/WO2004020116A1/de not_active Ceased
- 2003-07-30 EP EP03790831A patent/EP1528961B1/de not_active Expired - Lifetime
- 2003-07-30 AT AT03790831T patent/ATE324948T1/de not_active IP Right Cessation
- 2003-07-30 DE DE50303223T patent/DE50303223D1/de not_active Expired - Lifetime
- 2003-07-30 AU AU2003260338A patent/AU2003260338A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004020116A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| BR0313067B1 (pt) | 2012-11-27 |
| CN100335184C (zh) | 2007-09-05 |
| CN1675006A (zh) | 2005-09-28 |
| EP1528961B1 (de) | 2006-05-03 |
| DE50303223D1 (de) | 2006-06-08 |
| WO2004020116A1 (de) | 2004-03-11 |
| US7287534B2 (en) | 2007-10-30 |
| US20040026228A1 (en) | 2004-02-12 |
| BR0313067A (pt) | 2005-06-28 |
| ATE324948T1 (de) | 2006-06-15 |
| AU2003260338A1 (en) | 2004-03-19 |
| DE10237061A1 (de) | 2004-02-19 |
| MY136884A (en) | 2008-11-28 |
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