EP1240123A1 - Procede destine a empecher des depots de polymeres dans le traitement de fluxs d'hydrocarbures contenant des olefines - Google Patents

Procede destine a empecher des depots de polymeres dans le traitement de fluxs d'hydrocarbures contenant des olefines

Info

Publication number
EP1240123A1
EP1240123A1 EP00987638A EP00987638A EP1240123A1 EP 1240123 A1 EP1240123 A1 EP 1240123A1 EP 00987638 A EP00987638 A EP 00987638A EP 00987638 A EP00987638 A EP 00987638A EP 1240123 A1 EP1240123 A1 EP 1240123A1
Authority
EP
European Patent Office
Prior art keywords
process according
composition
nitroxides
aromatic amines
nitroxide
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Withdrawn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
EP00987638A
Other languages
German (de)
English (en)
Inventor
Marco Buccolini
Andrea Zanotti
Roberto Masciola
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.)
Chimec SpA
Original Assignee
Chimec SpA
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 Chimec SpA filed Critical Chimec SpA
Publication of EP1240123A1 publication Critical patent/EP1240123A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00—Purification; Separation; Use of additives
    • C07C7/04—Purification; Separation; Use of additives by distillation
    • C07C7/05—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00—Purification; Separation; Use of additives
    • C07C7/20—Use of additives, e.g. for stabilisation
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G75/00—Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general
    • C10G75/02—Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general by addition of corrosion inhibitors
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G75/00—Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general
    • C10G75/04—Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general by addition of antifouling agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
    • C10G9/16—Preventing or removing incrustation

Definitions

  • the present invention relates to a process for preventing polymeric fouling during the transfer of a hydrocarbon stream containing olefinic compounds through apparatuses for the relevant treatment, like, e.g., tne production, the storage, the refining, the fractionation, the compression, the extraction and the heating of the olefinic compounds contained in the stream.
  • olefinic compounds may form complex mixtures of ethylene, propylene, butadiene, isoprene, cyclopentadiene, styrene and of other higher olefins.
  • the process s based on the use of a stabilizing mixture consisting of a nitroxide or a dinitroxide compound and an aromatic amine.
  • the mixture comprising both the two types of nitroxide compound and an aromatic amine for the above mentioned use is novel to the state of the art and it has a synergistic effect experimentally verifiable with respect to the individual and separate use of the two types of compounds.
  • aromatic amines ⁇ r general, ana ID particular phenylene ⁇ iammes and diphenylamines, are widely used as antioxidants and stabilizers.
  • polymeric fouling deposits During the olefin production process by pyrolisis of gaseous or liquid hydrocarbon streams, the formation of polymeric fouling deposits is incurred: such deposits usually generate onto the surfaces of the apparatuses, with a formation mechanism which usually includes a polymerization following the formation of carbon or oxygen radicals, by thermal induction and catalysis of metals deriving from corrosion phenomena.
  • Polymeric fouling reduces thermal exchange, may adversely affect plant performance and stall the production capacity: in some cases the deposit that may be generated is so copious to cause the clogging of the sets of heat exchangers, the transfer pipes, the distillation column plates, and it may cause the unplanned shutdown of the plant itself.
  • Deposits are usually localized in the heat exchanger sets, the bottom column reboilers, on the column bottom itself, onto the plates and in the intermediate pumparounds, as well as onto the top of rectification and extraction columns, in the transfer pipes and on the bottom of containers for the temporary storage of pure monomers .
  • an object of the present invention is a process for preventing polymeric fouling in petrochemical plants for the treatment of olefinic compounds, in which in the supply stream of the treatment plants an amount of a stabilizing composition effective to prevent said fouling, comprising nitroxides and aromatic amines in a mixture therebetween in a weight ratio of 2:1 to 1:20, is introduced.
  • a further object of the invention is such stabilizing mixture and the use thereof to hinder fouling in plants for the treatment of olefinic compounds through petrochemical processes.
  • Nitroxides compounds suitable for use in the present invention are those containing free radicals. Particularly suitable ones are those selected from the group comprising 4-hydroxy-tetramethyl-piperidino-l-oxy) , or a nitroxide having the general formula
  • R" 0° R" wherein R, R' , and R' ' represent H, alkyl, cycloalkyl, aryl (Ci - C ⁇ 5 ) , substituted or unsubstituted with heteroatoms such as N, S, P, halogens and the like, or a dinitroxide, in particular of the type 1- piperidinyloxy-4, 4' - (1, 10-dioxo-l, 10-decanediyl) -bis- 2, 2, 6, 6-tetramethyl and mixtures thereof.
  • Suitable aromatic amines are in particular diphenylamines (DPA) and phenylene diamines (PDA) or aromatic amines of general formula
  • R wherein R, R' , R' ' have the above stated meaning, and mixtures thereof.
  • the quantitative weight ratio of nitroxide and/or dinitroxide compound with respect to the aromatic amines ranges from 2:1 to 1:20, preferably from 1:7,5 to 2:5.
  • the mixture is preferably a solution wherein the active substances nitroxide and aromatic amines are dissolved in an extractant.
  • Suitable extractants are, by way of example, aliphatic extractants, xylene, benzene and higher homologous substances.
  • the stabilizing mixture may preferably be added, with respect to the fluid material to be treated, in an amount of from 0,5 to 50 ppm.
  • the combined additive consisting of the two active substances, may be added in sites which correspond to the plant sites, related to the whole range of steps of production, selective extraction, rectification and storage, that can be liable to fouling due to particularly disadvantageous thermal conditions or to the presence of metal-containing oxygen or water, or in presence of particularly high concentrations of markedly reactive olefins.
  • the stabilizing mixture which is a combination of the two active substances, is added to the load streams. However it may also be supplied at the column bottom reboilers.
  • the term "column" is intended to mean the distillation apparatus of a hydrocarbon stream containing olefins for the separation of a mixture made of C n .
  • the stabilizing mixture may be supplied at the bottom reboiler of the quench oil column (cooling of the hydrocarbon stream carried out with quench oil) in the cracking gas compression section, in particular under suction among the 3 rd , 4 th and 5 th stage, in the cuts directed to hydrogenation processes (pyrolysis or cracking gasoline) , in the mixtures directed to temporary storage and in the feed and/or in the overhead reflux of the rectification and purification processes of the olefinic compounds.
  • the use of the mixture according to the invention enables the control of the undesirable polymerization reactions to be increased, as well as the nitroxide amounts required for the antifouling treatment (with the entailed cost reduction) to be decreased.
  • the instrument represents one of the most technically sophisticated modules for reproducing fouling situations in any one plant: by controlling the heating of the liquid in the circuit, as well as measuring the ⁇ P both at the inlet and at the outlet of the cell provided for the purpose, full information may be obtained, for assessing the tendency of- a certain fluid to deposit organic fouling.
  • the instrument was used in the ⁇ P configuration, using the cell module provided for the purpose and automatically recording over time the pressure exerted onto a filter for collecting the insoluble substances formed upon heating of the processed fluid.
  • the operative temperature or skin temperature was set at 120 °C. This represents the temperature at which the filament transferring heat to the exchanger 1 is electrically heated.
  • the tested fluid F is run onto the outer surface of the exchanger.
  • the two lines 2, 3 at the top of the exchanger are connected to a transducer which detects the pressure difference ⁇ p between the circuit section upstream of the strain 4 and the downstream one.
  • the internal pressure of the apparatus is of about 21 Atm .
  • a fluid exactly corresponding to that present at the bottom of a depropanizing column (this is the column section wherein the conditions required to form insoluble polymers are most likely to occur, usually under 10-12 atm) would be, under the instrument conditions, in a near-gaseous state.
  • the cut density was set at 0,65 gr/cm 3 : moreover, the mixture employed was further enriched in C4 by scrubbing gaseous butadiene (previously TBC-freed by soda washing) into the cooled liquid (-20°C).
  • Aromatic amine 10 ppm PDA + hydroxyl amine: 2 ppm + 2 ppm 4H-TEMPO x 1: 200 ppb
  • the second test series, (Table 4) carried out with a second sampling of the same cut confirms the preceding inclinations, with the utmost efficiency, both as the initial sinuosity and after 480 min, of the dinitroxide - PDA mixture.
  • PDA + Dinitroxide (5:2): 1 ppm + 400 ppb
  • the isoprene employed is the commercially available one, and, prior of being fed into the autoclave, it was washed in a separatory funnel with repeated soda and water washings, then dehydrated with anhydrous sodium sulfate .
  • Table 6 reports the weight of the polymer obtained by heating at 90°C a fixed amount of pure isoprene, under the initial pressure of 2 atm obtained with a nitrogen pressure-controlling device.
  • the test duration was set at 24 hours with constant stirring of 200 rpm: then the residual isoprene left over was evaporated at 100°C, under nitrogen stream.
  • Table 7 reports other results, always obtained with isoprene, mixed in this case, at the beginning of the test, to an equal amount of isooctane.
  • the solvent allows more isoprene to remain in a liquid state, whereby the effect of the additives, which of course remain dissolved in the liquid phase, becomes more evident. Furthermore, the test temperature was brought to 100°C.
  • the mixture of isoprene-solvent-anti- polymerization agents forms a more homogeneous phase, hence the results of polymerization inhibition are markedly improved with respect to the first test series, notwithstanding a markedly lower concentration of the additive.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

L'invention concerne une composition comprenant un nitroxyde ou un dinitroxyde et une amine aromatique utilisée comme additif afin d'empêcher des dépôts de polymères dans des appareils pétrochimiques servant à produire, stocker, raffiner, fractionner, mettre sous pression et extraire des composés oléfiniques d'un flux d'hydrocarbure.
EP00987638A 1999-12-24 2000-12-27 Procede destine a empecher des depots de polymeres dans le traitement de fluxs d'hydrocarbures contenant des olefines Withdrawn EP1240123A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT1999RM000795A IT1307306B1 (it) 1999-12-24 1999-12-24 Procedimento per impedire la formazione di fouling polimerico neltrattamento di cariche idrocarburiche contenenti olefine.
ITRM990795 1999-12-24
PCT/IT2000/000548 WO2001047844A1 (fr) 1999-12-24 2000-12-27 Procede destine a empecher des depots de polymeres dans le traitement de fluxs d'hydrocarbures contenant des olefines

Publications (1)

Publication Number Publication Date
EP1240123A1 true EP1240123A1 (fr) 2002-09-18

Family

ID=11407118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00987638A Withdrawn EP1240123A1 (fr) 1999-12-24 2000-12-27 Procede destine a empecher des depots de polymeres dans le traitement de fluxs d'hydrocarbures contenant des olefines

Country Status (3)

Country Link
EP (1) EP1240123A1 (fr)
IT (1) IT1307306B1 (fr)
WO (1) WO2001047844A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20060581A1 (it) * 2006-10-26 2008-04-27 Chimec Spa Additivo stabilizzante per olio combustibile
EP2233505A1 (fr) 2009-03-23 2010-09-29 Total Petrochemicals Research Feluy Compositions stabilisées comportant des oléfines
DE102013204950A1 (de) 2013-03-20 2014-09-25 Evonik Industries Ag Verfahren und Zusammensetzung zur Inhibierung der Polymerisation von Cyclopentadienverbindungen
EP3026101A1 (fr) 2014-11-26 2016-06-01 Borealis AG Huile de lavage destinée à être utilisée comme agent antisalissure dans des compresseurs de gaz
CA3034458C (fr) * 2016-08-31 2023-09-26 Ecolab Usa Inc. Methode d'inhibition de la polymerisation dans une eau de procede
EP3947271A1 (fr) 2019-04-02 2022-02-09 Ecolab Usa Inc. Système de génération de dioxyde de chlore pur à usage d'acide réduit
TW202348787A (zh) 2022-04-01 2023-12-16 美商藝康美國公司 用於乙烯系單體流之高苛刻度加工的防汙劑組成物
TW202404930A (zh) 2022-04-01 2024-02-01 美商藝康美國公司 在共軛二烯單體之萃取蒸餾期間減少非所要之乳化聚合
TW202348786A (zh) 2022-04-01 2023-12-16 美商藝康美國公司 用於蒸氣空間應用之防汙劑組成物
CN114685854A (zh) * 2022-04-25 2022-07-01 萧县新秀新材料有限公司 一种用于反式异戊橡胶的稳定剂及应用

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US4670131A (en) * 1986-01-13 1987-06-02 Exxon Chemical Patents Inc. Method for controlling fouling of hydrocarbon compositions containing olefinic compounds
US5711767A (en) * 1996-07-11 1998-01-27 Ciba Specialty Chemicals Corporation Stabilizers for the prevention of gum formation in gasoline
GB9614854D0 (en) * 1996-07-15 1996-09-04 Marks A H & Co Ltd Free radical scavengers
EP1056711B1 (fr) * 1997-08-07 2004-10-06 Basf Aktiengesellschaft Procede de stabilisation d'esters d'acide (meth)acrylique vis-a-vis d'une polymerisation par voie radicalaire indesirable
US5955643A (en) * 1997-10-17 1999-09-21 Nalco/Exxon Energy Chemicals, L.P. Composition and method for inhibiting polymerization during the anaerobic of styrene
US6337426B1 (en) * 1998-11-23 2002-01-08 Nalco/Exxon Energy Chemicals, L.P. Antifoulant compositions and processes
AU1863100A (en) * 1998-12-17 2000-07-03 Ciba Specialty Chemicals Holding Inc. Inhibiting polymerization of vinyl aromatic monomers using synergistic mixtures containing nitroxide stabilizers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0147844A1 *

Also Published As

Publication number Publication date
WO2001047844A1 (fr) 2001-07-05
ITRM990795A1 (it) 2001-06-25
IT1307306B1 (it) 2001-10-30
ITRM990795A0 (it) 1999-12-24

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