WO2011131643A2 - Verfahren zur herstellung von carbonsäureestern durch reaktivdestillation - Google Patents
Verfahren zur herstellung von carbonsäureestern durch reaktivdestillation Download PDFInfo
- Publication number
- WO2011131643A2 WO2011131643A2 PCT/EP2011/056189 EP2011056189W WO2011131643A2 WO 2011131643 A2 WO2011131643 A2 WO 2011131643A2 EP 2011056189 W EP2011056189 W EP 2011056189W WO 2011131643 A2 WO2011131643 A2 WO 2011131643A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- alcohol
- carboxylic acid
- acid ester
- reaction
- reaction column
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/03—Preparation of carboxylic acid esters by reacting an ester group with a hydroxy group
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Definitions
- the invention relates to a process for the preparation of carboxylic acid esters, in particular of ethyl formate, by transesterification.
- Low molecular weight esters such as formic acid esters find z. B. as fragrances, insecticides, fungicides or in organic synthesis application. Methods for the preparation of low molecular weight esters are described in various ways in the literature. An inexpensive option is the esterification of carboxylic acid and alcohol followed by 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.
- the esterification of formic acid and alcohol is carried out by reactive distillation, wherein the resulting distillate is dehydrated by means of acetic anhydride.
- acetic anhydride a distillate 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.
- the bottom stream comprises the ester formed and not um- put carboxylic acid.
- the top stream comprises unreacted alcohol, water and entrainers.
- the invention has for its object to provide a process for the production of high purity ester, which is economical to carry out and provides a lower equipment investment requirements and in particular bypasses the requirement of acid-resistant materials.
- the object is achieved by a process for the preparation of carboxylic acid esters by transesterification, in which one introduces a first feed comprising a first carboxylic acid ester, and a second feed comprising a first alcohol in a reaction column and in a reaction zone of the reaction column below Forming a second carboxylic acid ester and a second alcohol, wherein the first alcohol has a higher molecular weight than the second alcohol and wherein the second carboxylic acid ester and the second alcohol is continuously removed from the reaction zone.
- the process is suitable for the preparation of low molecular weight carboxylic acid esters which can be evaporated without decomposition.
- the starting material is a first carboxylic acid ester which is the ester of a carboxylic acid with the second alcohol.
- the first carboxylic acid ester is preferably an ester of a C 1 -C 8 -carboxylic acid, eg. As an ester of formic acid, acetic acid, propionic acid, chloroacetic acid, bromoacetic acid, lactic acid, glycolic acid.
- the first carboxylic acid ester is a formic acid ester.
- the first alcohol has a higher molecular weight than the second alcohol.
- the first alcohol is a C 2 -C 8 alcohol, preferably ethanol, and the second alcohol is methanol.
- a particularly preferred embodiment relates to a process for the preparation of ethyl formate in which the first carboxylic acid ester is methyl formate and the first alcohol is ethanol.
- reaction zone is meant a region of the reaction column in which suitable conditions, in particular with respect to temperature, pressure and presence a catalyst, so that the reaction between the first carboxylic ester and the first alcohol proceeds at an appropriate rate. Parallel to the chemical reaction in the reaction zone, a mass transfer takes place. The removal of the second carboxylic acid ester and the second alcohol from the reaction zone on the one hand causes a shift in the reaction equilibrium and on the other hand prevents subsequent reactions, whereby the selectivity of the reaction is greatly increased.
- the reaction column contains separating internals, such as separating trays, z.
- separating internals such as separating trays, z.
- ordered packings eg. B. sheet or tissue packings such as Sulzer Mellapak 250 Y, Sulzer BX, Montz B1 or Montz A3 or Kühni Rhombopak, or random beds of packing, such.
- Orderly packages, preferably sheet metal or fabric packages have a specific surface area of 100 to 750 m 2 / m 3 , in particular 250 to 500 m 2 / m 3 . They allow high separation performance at low pressure drops.
- the reaction column used is advantageously a rectification column which has 5 to 100, preferably 20 to 50, actual or theoretical plates.
- the bottom of the reaction column is heated with at least one built-in and / or external heater.
- the external heater can work with forced or natural circulation.
- the operating pressure of the reaction column is 0.5 to 7 bar, preferably 1 to 5 bar and more preferably 1 to 3 bar (absolute).
- the temperature in the sump depends on the nature of the first carboxylic ester and / or first alcohol and in the reaction of methyl formate with ethanol is usually 50 to 150 ° C, preferably 60 to 100 ° C.
- the reaction can be carried out in the presence of a suitable catalyst, for.
- a suitable catalyst for.
- an acidic or basic catalyst preferably a basic catalyst.
- the catalyst can be both heterogeneous catalysts and homogeneously soluble catalysts.
- homogeneously soluble is intended to mean that the catalyst used is soluble to more than 1 g / 100 ml at 22 ° C., at least in the first alcohol used.
- heterogeneous basic catalysts are arranged in a stationary manner in the reaction zone.
- Heterogeneous catalysts are selected, for example, below basic oxides, mixed oxides or hydroxides and ion exchangers in amine or hydroxyl form.
- the materials may be used as such or embedded in an oxidic binder matrix, e.g., from alumina, silica, mixtures of fumed silica and alumina, titania, zirconia or clay into moldings such as strands or tablets are formed.
- an oxidic binder matrix e.g.
- the heterogeneous basic catalyst is in particulate form having a particle size (maximum elongation) of 1 to 10 mm, preferably 1 to 4 mm.
- the heterogeneous catalyst is introduced into the reaction zone in such a way that sufficient gaps remain so that a rectificative mass transfer can take place.
- the catalyst is preferably used in a concentration of 10 to 60% by volume, based on the void volume of the column.
- the heterogeneous catalyst can be placed on trays or installed as a catalyst bed in the reaction zone.
- catalyst-containing packages e.g. Montz MULTIPAK or Sulzer KATAPAK, or to introduce the catalyst in the form of packing in the column.
- the heterogeneous catalysts between an inert fabric or knitted fabric, for. B. fiberglass bring in and roll up into bales (so-called Bales).
- the bales can be arranged next to and above each other so that the bales of one layer cover the interstices of the underlying layer.
- the heterogeneous catalyst has a suitable particle size and shape such that it can be introduced into the reaction zone as a packing, optionally mixed with inert fillers.
- Homogeneously soluble basic catalysts are metered into the reaction column at any suitable point in the lower to middle column range, expediently together with the first alcohol.
- the homogeneously soluble catalysts used are, for. B. selected from alkali metal hydroxides and / or alcoholates, such as potassium, sodium methylate.
- the catalysts are expediently metered in the form of a solution in a suitable solvent.
- a preferred solvent is the first or second alcohol used in the process of the invention.
- the homogeneously soluble catalyst if used, is usually used in an amount of 0.00001 to 0.2, preferably 0.0001 to 0.1, and more preferably 0.0005 to 0.05, equivalents based on the first carboxylic acid ester.
- the first feed is preferably introduced laterally into the reaction column at at least one first feed point located between the top and bottom of the reaction column, and introduces the second feed laterally into the reaction column at a second feed point located above the first feed point.
- the reaction zone extends at least partially to the column section between the first and second feed points.
- the ongoing removal of the reaction products from the reaction zone is achieved by the mass transfer processes taking place in the reaction column.
- vapors of a low-boiling fraction which comprises the second carboxylic acid ester formed and the unconverted first carboxylic acid ester and the unreacted first alcohol and the second alcohol are removed.
- the low-boiling fraction passes into a rectifying section of the reaction column, in which the entrained unreacted first alcohol and the second alcohol are separated and run back into the reaction zone.
- a product fraction comprising the second carboxylic acid ester and unconverted first carboxylic acid ester, preferably as a side draw.
- the second carboxylic acid ester and the first carboxylic acid ester form azeotropes with the alcohols, so that the composition of the product fraction substantially corresponds to the azeotrope composition.
- the product fraction may contain minor amounts of first alcohol and second alcohol.
- top fraction At the top of the reaction column mainly unreacted first carboxylic acid ester is condensed and partly recycled as a head reflux in the reaction column and partially withdrawn as a top fraction.
- the top fraction is at least partially returned to the reaction zone, for example by admixing with the first feed. Another part of the top fraction can be removed to prevent accumulation of low boilers.
- a condensate of a high-boiling fraction comprising in addition to unreacted first alcohol and second alcohol entrained second carboxylic acid ester and unreacted first carboxylic acid ester.
- the high-boiling fraction passes into a stripping section of the column in which the entrained second carboxylic acid ester and unreacted first carboxylic acid ester are stripped off and returned to the reaction zone.
- a bottoms fraction comprising the second alcohol and unreacted first alcohol can be withdrawn. In order to remove forming high-boiling components, part of the bottoms fraction can be discarded.
- the bottom fraction is separated by distillation into the second alcohol and unconverted first alcohol, preferably in a further distillation column.
- the unreacted first alcohol is advantageously at least partially recycled to the reaction zone by admixing it, for example, the second feed.
- the product fraction contains in addition to the second carboxylic acid ester usually unreacted first carboxylic acid ester and small amounts of second alcohol and unreacted first alcohol.
- the product fraction is therefore preferably separated by distillation into pure second carboxylic acid ester and a fraction containing unreacted first carboxylic acid ester.
- the distillative separation is preferably carried out continuously in a second column.
- the fraction containing the unreacted first carboxylic acid ester is preferably at least partly returned to the reaction zone, for example by admixing with the first feed.
- the product fraction comprises azeotropes of the second carboxylic acid ester with second alcohol and unreacted first alcohol and unreacted first Carbonklareester. Since the azeotrope composition is generally pressure-dependent, the separation of the azeotrope succeeds by distillation at a pressure which is different from the pressure in the reaction column. The person skilled in this phenomenon is known as a two-pressure process or pressure swing rectification or pressure swing distillation. At a different pressure from the pressure in the reaction column, the composition of the product fraction corresponds to another azeotrope composition.
- the second carboxylic acid ester in the second column, can be withdrawn purely at the bottom or in the lower part of the column, for example near the bottom region of the column, while an azeotropic mixture is formed in the top, albeit in a significantly different composition than in the product fraction.
- This azeotropic mixture can be fed back into the reaction zone.
- the stream obtained at the bottom of the second column contains 99.0 to 100% by weight (in particular 99.8 to 100% by weight) Ethyl formate, 0 to 1 wt .-% (in particular 0 to 0.2 wt .-%) of ethanol and 0 to 1 wt .-% (in particular 0 to 0.2 wt .-%) of other compounds.
- Fig. 1 shows schematically a suitable for carrying out the method according to the invention plant.
- reaction column T1 is introduced via a lateral inlet 2, which is located at the upper end of the reaction zone 1, a first alcohol.
- a heterogeneous catalyst (not shown) is introduced in a stationary manner.
- the reaction takes place to the second carboxylic acid ester and second alcohol.
- the second carboxylic acid ester and unconverted first carboxylic acid ester enter the enrichment section 4 of the reaction column T1, where they are largely freed from entrained second alcohol and unreacted first alcohol.
- Second alcohol and unreacted first alcohol from the reaction zone 1 enter the stripping section 5 of the Christshkolonne T1, where they are stripped off entrained second carboxylic acid ester and unreacted first carboxylic acid ester.
- the bottoms fraction withdrawn via line 7 consists mainly of second alcohol and unreacted first alcohol.
- the vapor 8 obtained at the top of the reaction column is condensed and partly returned to the reaction column via line 9 as a head reflux and partially fed via line 10 as feed into the reaction zone.
- the withdrawn at the side offtake 6 product fraction from the reaction column T1 is fed to a distillation column T2 at its upper portion.
- the column T2 is operated at a different pressure, usually a higher pressure, than the reaction column T1.
- At the bottom of the distillation column T2 falls to pure second carboxylic acid ester, which is removed via line 1 1.
- the top hatch of the distillation column T2 is returned via the line 12 in the reaction column T1.
- the bottoms fraction from the reaction column T1 is withdrawn via line 7 and fed to a distillation column T3.
- reaction column operated at 1 bar with 30 theoretical stages were fed at stage 10 about 60 g / h of ethanol. At level 5, 81 g / h of methyl formate was added. It is assumed that on the intervening soils the reaction to ethyl formate and methanol takes place up to chemical equilibrium.
- the reflux ratio of the reaction column was about 11.
- the overhead condensate consisting essentially of methyl formate was partially returned as reflux and partially recycled to the lower part of the reaction column.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11714782A EP2560943A2 (de) | 2010-04-19 | 2011-04-19 | Verfahren zur herstellung von carbonsäureestern durch reaktivdestillation |
JP2013505444A JP2013525325A (ja) | 2010-04-19 | 2011-04-19 | 反応蒸留によるカルボン酸エステルの製造方法 |
KR1020127030034A KR20130051452A (ko) | 2010-04-19 | 2011-04-19 | 반응성 증류에 의한 카르복실산 에스테르의 제조 방법 |
CN201180019648.8A CN102844292B (zh) | 2010-04-19 | 2011-04-19 | 通过反应性蒸馏制备羧酸酯的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10160353.8 | 2010-04-19 | ||
EP10160353 | 2010-04-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2011131643A2 true WO2011131643A2 (de) | 2011-10-27 |
WO2011131643A3 WO2011131643A3 (de) | 2011-12-29 |
Family
ID=44625874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/056189 WO2011131643A2 (de) | 2010-04-19 | 2011-04-19 | Verfahren zur herstellung von carbonsäureestern durch reaktivdestillation |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2560943A2 (de) |
JP (1) | JP2013525325A (de) |
KR (1) | KR20130051452A (de) |
CN (1) | CN102844292B (de) |
WO (1) | WO2011131643A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014050788A1 (ja) * | 2012-09-28 | 2014-04-03 | Jx日鉱日石エネルギー株式会社 | カルボン酸無水物の製造方法 |
CN106083586A (zh) * | 2016-08-10 | 2016-11-09 | 烟台国邦化工机械科技有限公司 | 一种利用甲酸和乙醇合成甲酸乙酯并提纯产品的工艺方法 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102019037B1 (ko) * | 2017-05-26 | 2019-09-06 | 지에스칼텍스 주식회사 | 알킬 카르복실산 에스테르의 제조 방법 |
WO2022065853A1 (ko) * | 2020-09-24 | 2022-03-31 | 주식회사 엘지화학 | 에스터계 조성물의 제조방법 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
WO2007099071A1 (en) | 2006-02-28 | 2007-09-07 | Shell Internationale Research Maatschappij B.V. | A process for reactive distillation of a carboxylic acid |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000016966A (ja) * | 1998-07-01 | 2000-01-18 | Mitsubishi Gas Chem Co Inc | アクリル酸エステルまたはメタクリル酸エステルの製造方法 |
DE102007006917A1 (de) * | 2007-02-13 | 2008-08-14 | Technocon Gmbh | Verfahren und Vorrichtung zur kontinuierlichen katalytischen Umesterung |
-
2011
- 2011-04-19 EP EP11714782A patent/EP2560943A2/de not_active Withdrawn
- 2011-04-19 WO PCT/EP2011/056189 patent/WO2011131643A2/de active Application Filing
- 2011-04-19 CN CN201180019648.8A patent/CN102844292B/zh not_active Expired - Fee Related
- 2011-04-19 JP JP2013505444A patent/JP2013525325A/ja not_active Withdrawn
- 2011-04-19 KR KR1020127030034A patent/KR20130051452A/ko not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
WO2007099071A1 (en) | 2006-02-28 | 2007-09-07 | Shell Internationale Research Maatschappij B.V. | A process for reactive distillation of a carboxylic acid |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014050788A1 (ja) * | 2012-09-28 | 2014-04-03 | Jx日鉱日石エネルギー株式会社 | カルボン酸無水物の製造方法 |
JPWO2014050788A1 (ja) * | 2012-09-28 | 2016-08-22 | Jxエネルギー株式会社 | カルボン酸無水物の製造方法 |
CN106083586A (zh) * | 2016-08-10 | 2016-11-09 | 烟台国邦化工机械科技有限公司 | 一种利用甲酸和乙醇合成甲酸乙酯并提纯产品的工艺方法 |
CN106083586B (zh) * | 2016-08-10 | 2021-09-14 | 烟台国邦化工机械科技有限公司 | 一种利用甲酸和乙醇合成甲酸乙酯并提纯产品的工艺方法 |
Also Published As
Publication number | Publication date |
---|---|
JP2013525325A (ja) | 2013-06-20 |
WO2011131643A3 (de) | 2011-12-29 |
CN102844292A (zh) | 2012-12-26 |
KR20130051452A (ko) | 2013-05-20 |
CN102844292B (zh) | 2014-07-16 |
EP2560943A2 (de) | 2013-02-27 |
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