EP2560945A2 - Purification d'esters d'acides carboxyliques par distilllation extractive - Google Patents

Purification d'esters d'acides carboxyliques par distilllation extractive

Info

Publication number
EP2560945A2
EP2560945A2 EP11718314A EP11718314A EP2560945A2 EP 2560945 A2 EP2560945 A2 EP 2560945A2 EP 11718314 A EP11718314 A EP 11718314A EP 11718314 A EP11718314 A EP 11718314A EP 2560945 A2 EP2560945 A2 EP 2560945A2
Authority
EP
European Patent Office
Prior art keywords
carboxylic acid
acid ester
extractant
purified
weight
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.)
Withdrawn
Application number
EP11718314A
Other languages
German (de)
English (en)
Inventor
Helmut Kronemayer
Ellen Dahlhoff
Andreas Lanver
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to EP11718314A priority Critical patent/EP2560945A2/fr
Publication of EP2560945A2 publication Critical patent/EP2560945A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/48—Separation; Purification; Stabilisation; Use of additives
    • C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
    • C07C67/54—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
    • C07C69/02—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen
    • C07C69/04—Formic acid esters
    • C07C69/06—Formic acid esters of monohydroxylic compounds

Definitions

  • the invention relates to a process for the purification of carboxylic acid esters.
  • Low molecular weight esters such as formic acid esters find z. B. as fragrances, insecticides, fungicides or in organic synthesis application. Processes for the preparation of low molecular weight esters are widely described in the literature. A cost-effective production possibility is the esterification of carboxylic acid and alcohol with subsequent distillation of the ester. This process is in many cases technically very easy to carry out because the product in the form of the ester is the lowest-boiling compound. In US-A 5,302,747 a process is described in which an inert gas is passed through an esterification mixture containing an alcohol and a carboxylic acid and maintained at least at the boiling temperature of the alcohol to drive off the ester.
  • JP 10175916 describes the preparation of highly pure formic acid esters.
  • the esterification of formic acid and alcohol is carried out by reactive distillation, wherein the resulting distillate is dehydrated by means of acetic anhydride.
  • water can be removed by the use of drying agents. Unreacted alcohol can not be removed in a comparable manner.
  • WO 2007/099071 describes the preparation of esters by a reactive distillation.
  • a carboxylic acid, an alcohol and an entraining agent are introduced in a reaction column.
  • the bottom stream comprises the ester formed and unreacted carboxylic acid.
  • the top stream comprises unreacted alcohol, water and entrainers.
  • the invention has for its object to provide an efficient method for the purification of carboxylic acid esters. According to the invention the object is achieved by a process for the purification of carboxylic acid esters, in which distilling a carboxylic acid ester in the presence of an extractant.
  • the process is suitable for purifying low molecular weight carboxylic acid esters which can be evaporated without decomposition.
  • Carboxylic acids with C 1 -C 8 -alcohols such as methyl formate, ethyl formate, propyl formate, isopropyl formate, n-butyl formate, sec-butyl formate and n-pentyl formate, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, n-butyl acetate, sec-butyl acetate and n-pentyl acetate.
  • the carboxylic acid ester is preferably a formic acid ester, in particular ethyl formate.
  • the impurities contained in the carboxylic acid ester to be purified are usually selected from water, alcohol and free carboxylic acid.
  • the alcohol and the free carboxylic acid usually correspond to the alcohol and carboxylic acid constituents of the carboxylic acid ester to be purified.
  • the alcohol and the free carboxylic acid may also comprise a foreign alcohol and / or a foreign carboxylic acid.
  • carboxylic acid ester to be purified it may, for. B. to a crude distillate of an esterification reaction or transesterification reaction.
  • the purity of the carboxylic ester to be purified is generally 50 to 99.5% by weight, usually 95 to 99% by weight.
  • the pure carboxylic acid ester obtained by the process according to the invention generally has a purity of at least 99.5 wt .-%, preferably at least 99.8 wt .-%, on.
  • the purity of the carboxylic acid ester may, for. B. by gas chromatography, ion chromatography, titrimetric methods or pH measurements can be determined.
  • the process according to the invention can be carried out in a simple manner by heating a mixture of the carboxylic acid ester to be purified and the extractant to boiling and collecting and condensing the vapors of the pure carboxylic acid ester.
  • the distillation is carried out as a fractional distillation.
  • Conventional equipment suitable for this purpose are, for example, those described in Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd Ed., Vol. 7, John Wiley & Sons, New York, 1979, pages 870-881.
  • extractive distillation zone is meant a column section in which the carboxylic acid ester to be purified and the extractant come into contact with each other under conditions of extractive distillation.
  • the extractive distillation makes use of the phenomenon that the fugacity of the constituents of the mixture to be separated changes as a result of the addition of the extractant. Extractants used in accordance with the invention selectively increase the relative fugacity of the carboxylic acid ester.
  • the carboxylic acid ester in the distillation in the presence of the extractant is preferably in the low-boiling overhead product, while the impurities such as carboxylic acid, alcohol and water, in the extract, the heavier-boiling bottom product of the distillation, find again.
  • the process can be carried out batchwise, for which purpose the carboxylic acid ester to be purified is introduced in a distillation bubble.
  • the submitted to be purified carboxylic acid ester is heated to boiling and the vapors passed through the distillation column.
  • the extractant is introduced at the top or preferably laterally and leads to the vapor. The extractant collects with the impurities in the distillation bubble.
  • the process can be carried out continuously, for which purpose the carboxylic ester to be purified is introduced below the extractive distillation zone into the distillation column or into the bottom of the distillation column and an extractant-containing stream is withdrawn from the bottom.
  • the pure carboxylic acid ester is withdrawn above the extractive distillation zone as a side draw or as a top fraction, preferably as a top fraction.
  • the distillation column is provided with means for condensing and collecting the head sample. provided. About a condensate divider, a portion of the overhead condensate can be given as reflux back to the column. The other part of the condensate is withdrawn as a product.
  • the distillation can be carried out at reduced pressure, atmospheric pressure or overpressure. A preferred pressure range is 15 mbar to 10 bar, more preferably 0.5 to 1.5 bar.
  • the distillation can be carried out in a temperature range (bottom temperature) of 20 ° to 250 ° C, preferably at least 50 ° C.
  • the distillation column preferably contains internals which consist of trays, rotating internals, disordered and / or ordered packings.
  • the columns used can have random beds with different packing. They can be made of any suitable material such as steel, stainless steel, nickel base alloys such as HC, copper, carbon, stoneware, porcelain, glass, plastics, and in various forms such as spheres, rings with smooth or profiled surfaces, rings with internal webs or wall penetrations, wire mesh rings, calipers and spirals.
  • suitable material such as steel, stainless steel, nickel base alloys such as HC, copper, carbon, stoneware, porcelain, glass, plastics, and in various forms such as spheres, rings with smooth or profiled surfaces, rings with internal webs or wall penetrations, wire mesh rings, calipers and spirals.
  • Packages with regular geometry can, for. B. from sheets or tissues exist. Examples of such packages are Sulzer metal or plastic BX packages, Sulzer multi-plate Mellapack sheet metal packings, structural packings from Sulzer (Optiflow), Montz (BSH) and Kühni (Rombopack).
  • the distillation column is provided with means for bottom heating.
  • evaporators come into consideration, which are installed in the sump, such as a Robert evaporator, or a circulation with an external evaporator, eg. B. tube or plate heat exchanger.
  • a circulation is then for example a forced circulation or a natural circulation.
  • Suitable classes of substances which are suitable as extractants are preferably diols, polyols, open-chain or cyclic amides and mixtures of the mentioned classes of substances. Examples of suitable diols and polyols are ethylene glycol, diethylene glycol,
  • Triethylene glycol polyethylene glycol, 1, 3-propanediol, 2-methyl-1, 3-propanediol, 1, 4-butanediol, dipropylene glycol, 1, 5-pentanediol, 1, 6-hexanediol and glycerol called.
  • Suitable open-chain or cyclic amides are formamide, N-methylformamide, N, N-dimethylformamide, N-methylpyrrolidone, acetamide and N-methylcaprolactam.
  • the extractant has a boiling point (under atmospheric pressure) which is at least 30 ° C higher, in particular at least 100 ° C higher than the boiling point (under normal pressure) of the carboxylic acid ester to be purified.
  • the polar extractants used are preferably diols or polyols having 3 to 5 OH groups.
  • diols and polyols are called ethylene glycol, 1, 4-butanediol, 2-methyl-1, 3-propanediol, of which ethylene glycol is particularly preferred.
  • Suitable extractants are ionic liquids.
  • ionic liquids are meant salts having a melting point below 100 ° C., preferably below 80 ° C.
  • aromatic heterocycles are preferred.
  • Particularly preferred compounds are those which have a molar mass of less than 1000 g / mol, very particularly preferably less than 600 g / mol and in particular less than 400 g / mol.
  • Preferred cations are selected from the compounds of the formulas (La) to (lw), ⁇
  • R is hydrogen, alkyl, alkenyl, cycloalkyl, cycloalkenyl, polycyclyl, heterocycloalkyl, aryl or heteroaryl; Radicals R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 and R 9 attached to a ring carbon atom independently of one another represent hydrogen, a sulfo group, COOH, carboxylate, sulfonate, acyl , Alkoxycarbonyl, cyano, halogen, hydroxyl, SH, nitro, NE 1 E 2 , alkyl, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, alkenyl, cycloalkyl, cycloalkyloxy, cyclo- alkenyl, cycloalkenyloxy, polycyclyl, polycycloxy, heterocycloalkyl, aryl, aryl
  • B in the compounds of the formulas (Ix1) and (Ix2) together with the CN group to which it is attached forms a 4- to 8-membered, saturated or unsaturated or aromatic cycle which is optionally substituted and / or which may optionally have further heteroatoms or heteroatom-containing groups and / or may comprise further fused saturated, unsaturated or aromatic carbocycles or heterocycles.
  • Two adjacent radicals R 1 to R 9, together with the ring atoms to which they are attached, form at least one fused, saturated, unsaturated or aromatic ring or a ring system having from 1 to 30 carbon atoms, the ring or the ring system not being adjacent to 1 to 5 Heteroatoms or heteroatom-containing groups may have and wherein the ring or the ring system may be unsubstituted or substituted, these radicals may together as fused building blocks preferably 1, 3-propylene, 1, 4-butylene, 1, 5-pentylene, 2- Oxa-1,3-propylene, 1-oxa-1, 3-propylene, 1-oxa-1,3-propenylene, 3-oxa-1, 5-pentylene, 1 -zaza-1, 3-propenylene, I - C1-C4 Alkyl 1 -aza-1, 3-propenylene, 1,4-buta-1,3-dienylene, 1-az-1, 4-buta-1,3-dienylene or 2-aza-1
  • the radical R is preferably linear C 1 - to C 18 -alkyl, such as, for example, methyl, ethyl, 1-propyl, 1-butyl, 1-pentyl, 1-hexyl, 1-heptyl, 1-octyl, 1-decyl, 1 - dodecyl, 1 - tetradecyl, 1 -hexadecyl, 1 -octadecyl, very particularly preferably represents methyl, ethyl, 1 - 3 0- butyl and 1-octyl, and CH (CH2CH20) n-CH 2 CH 2 and CH 3 CH 2 0- ( CH 2 CH 2 0) m - CH 2 CH 2 - with m is 0 to 3.
  • the radicals R 1 to R 9 are independently hydrogen; C1-C18 alkyl, such as methyl, ethyl, 1-butyl, 1-pentyl, 1-hexyl, 1-heptyl, 1-octyl; phenyl; 2-hydroxyethyl; 2-cyanoethyl; 2- (alkoxycarbonyl) ethyl such as 2- (methoxycarbonyl) ethyl, 2- (ethoxycarbonyl) ethyl or 2- (n-butoxycarbonyl) ethyl; N, N- (C 1 -C 4 -dialkyl) amino, such as ⁇ , ⁇ -dimethylamino or ⁇ , ⁇ -diethylamino; Chlorine and radicals of oligoalkylene glycol, such as CH 3 0- (CH 2 CH 2 O) n-CH 2 CH 2 or CH 3 CH 2 O- (CH 2 CH 2 O) n-CH 2 CH 2 - where
  • imidazolium ions imidazolinium ions, pyridinium ions, pyrazolinium ions and pyrazolium ions are preferable.
  • Particularly preferred are the imidazolium ions and cations of 1, 5-diazabicyclo [4.3.0] non-5-ene (DBN) and 1, 8-diazabicyclo [5.4.0] undec-7-ene (DBU).
  • the anion of the ionic liquid is selected, for example, from the group of pseudohalides and halogen-containing compounds of the formulas: BF 4 -, PF 6 " , CF 3 SO 3 -, (CF 3 S0 3 ) 2 N-, CF 3 CO 2 -, CCI 3 CO 2 -, CN-, SCN -, OCN-; the group of sulphates, sulphites and sulphonates of the general formulas:
  • the radicals R c , R d are preferably each independently hydrogen; C 1 -C 30 -alkyl, alkyl which is completely or partially substituted by halogen, or C 6 -C 14 -aryl.
  • Preferred anions are formate, acetate, propionate, butyrate, lactate, saccharinate, carbonate, bicarbonate, sulfate, sulfite, C 1 -C 4 -alkyl sulfates, methanesulfonate, tosylate, trifluoroacetate, C 1 -C 4 -dialkyl phosphates and hydrogen sulfate.
  • Particularly suitable ionic liquids are 1-ethyl-3-methylimidazolium acetate and 1-n-butyl-3-methylimidazolium acetate.
  • Fig. 1 shows schematically a suitable for carrying out the method according to the invention plant.
  • the carboxylic acid ester to be purified is introduced into the lower region of the distillation column 1 via the feed 2 and the extractant is introduced into the upper region of the distillation column 1 via the feed 3.
  • the bottom 4 bottom product which consists essentially of extractant and impurities, withdrawn via the line 5 and partially returned via the heater 7 in the distillation column 1 and partially discharged via the line 6.
  • the line 8 overhead product which consists essentially of the pure carboxylic acid ester, withdrawn and condensed in the cooler 9. A portion of the condensate is recycled via line 10 into the distillation column 1.
  • Via line 1 1 pure carboxylic acid ester is withdrawn.
  • Example 2 is about 0.5% by weight of other compounds (including formic acid).
  • Comparative Example 2 About 860 g of a mixture having the composition of about 98.2% by weight of ethyl formate, 0.6% by weight of water, 1.2% by weight of ethanol were placed in the bottom of a 60 cm-long column which was used for increasing the separation performance was filled with packing. The sump was heated to boiling by means of a heated double jacket. The distillation was carried out at atmospheric pressure. At the top of the column was condensed by means of a water-cooled condenser (about 10 ° C) and using a reflux divider about one fifth of the condensate as reflux to the column, the remaining portion of the condensate was withdrawn. Distillate of the composition was obtained: about 98% by weight of ethyl formate,

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

L'invention concerne un procédé de purification d'esters d'acides carboxyliques, comme le formiate d'éthyle, selon lequel on distille un ester d'acide carboxylique en présence d'un agent d'extraction, de préférence en (a) laissant remonter les vapeurs de l'ester d'acide carboxylique à purifier dans une colonne de distillation; (b) en amenant, dans une zone de distillation extractive, l'agent d'extraction à l'encontre des vapeurs; (c) en récupérant des esters d'acides carboxyliques purs au-dessus de la zone de distillation extractive. L'agent d'extraction est choisi, par exemple, parmi des diols, polyols, amides cycliques ou à chaîne ouverte.
EP11718314A 2010-04-19 2011-04-18 Purification d'esters d'acides carboxyliques par distilllation extractive Withdrawn EP2560945A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11718314A EP2560945A2 (fr) 2010-04-19 2011-04-18 Purification d'esters d'acides carboxyliques par distilllation extractive

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10160346 2010-04-19
EP11718314A EP2560945A2 (fr) 2010-04-19 2011-04-18 Purification d'esters d'acides carboxyliques par distilllation extractive
PCT/EP2011/056110 WO2011131609A2 (fr) 2010-04-19 2011-04-18 Purification d'esters d'acides carboxyliques par distilllation extractive

Publications (1)

Publication Number Publication Date
EP2560945A2 true EP2560945A2 (fr) 2013-02-27

Family

ID=44626229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11718314A Withdrawn EP2560945A2 (fr) 2010-04-19 2011-04-18 Purification d'esters d'acides carboxyliques par distilllation extractive

Country Status (5)

Country Link
EP (1) EP2560945A2 (fr)
JP (1) JP2013525322A (fr)
KR (1) KR20130051453A (fr)
CN (1) CN102858733A (fr)
WO (1) WO2011131609A2 (fr)

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
US9447018B2 (en) 2009-10-20 2016-09-20 Greenyug, Llc Ethyl acetate production
US9079851B2 (en) 2012-02-01 2015-07-14 Greenyug, Llc Ethyl acetate production
WO2014130465A1 (fr) 2013-02-19 2014-08-28 Greenyug, Llc Production d'alcools supérieurs
CN103193203B (zh) * 2013-04-23 2016-08-24 上海化学试剂研究所 一种提升工业级过氧化氢品质的方法
WO2015038383A1 (fr) * 2013-09-10 2015-03-19 Greenyug, Llc Production d'acétate d'éthyle
BR112016012629B1 (pt) 2013-12-04 2020-12-01 Rescurve, Llc método e sistema de destilação reativa
CA3225290A1 (fr) 2015-08-19 2017-02-23 Viridis Chemical, Llc Composition de catalyseurs pour la conversion d'ethanol en n-butanol et alcools a haut poids moleculaire
PL3390380T3 (pl) 2015-12-18 2020-09-21 Basf Se Odzyskiwanie energii w sposobie wytwarzania 1,3,5-trioksanu
CN107473967A (zh) * 2017-07-05 2017-12-15 北京化工大学 一种离子液体萃取精馏同时脱除酸和水的方法
KR102306544B1 (ko) * 2017-09-07 2021-09-30 주식회사 엘지화학 에스터화 반응에서의 1가 알코올의 제거 방법 및 이를 포함하는 에스터 조성물의 제조 방법
KR102138788B1 (ko) 2017-09-07 2020-07-28 주식회사 엘지화학 에스터 조성물의 제조 시스템 및 이를 이용한 에스터 조성물의 제조 방법
CN116688549A (zh) * 2023-06-08 2023-09-05 中冶焦耐(大连)工程技术有限公司 一种苯加氢萃取蒸馏塔

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US4826576A (en) * 1985-08-22 1989-05-02 Lloyd Berg Separation of isopropyl acetate from isopropanol by extractive distillation
US5302747A (en) 1992-08-24 1994-04-12 Purdue Research Foundation Process for the manufacture of esters
JPH10175916A (ja) 1996-12-13 1998-06-30 Daicel Chem Ind Ltd ギ酸エステルの製造方法
AU3069600A (en) * 1999-01-28 2000-08-18 Izak Nieuwoudt Separation of methanol and methyl acetate from mixtures thereof by extractive distillation
WO2000044696A1 (fr) * 1999-01-28 2000-08-03 Izak Nieuwoudt Separation de l'ethanol et de l'acetate d'ethyle de melanges de ceux-ci, par distillation extractive
BRPI0707394A2 (pt) 2006-02-28 2011-05-03 Shell Internationale Res Maartschappij B V processo para destilação reativa

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Also Published As

Publication number Publication date
WO2011131609A3 (fr) 2011-12-15
JP2013525322A (ja) 2013-06-20
CN102858733A (zh) 2013-01-02
KR20130051453A (ko) 2013-05-20
WO2011131609A2 (fr) 2011-10-27

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