EP4326412A1 - Extraktionsverfahren - Google Patents
ExtraktionsverfahrenInfo
- Publication number
- EP4326412A1 EP4326412A1 EP22722696.6A EP22722696A EP4326412A1 EP 4326412 A1 EP4326412 A1 EP 4326412A1 EP 22722696 A EP22722696 A EP 22722696A EP 4326412 A1 EP4326412 A1 EP 4326412A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- salt
- dispersed
- water
- acrylic acid
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/02—Solvent extraction of solids
- B01D11/028—Flow sheets
- B01D11/0284—Multistage extraction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0492—Applications, solvents used
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/15—Preparation of carboxylic acids or their salts, halides or anhydrides by reaction of organic compounds with carbon dioxide, e.g. Kolbe-Schmitt synthesis
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/47—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
Definitions
- the present invention relates to a method for separating a salt S, the salt S being dispersed in an aprotic polar liquid A, the liquid A with the dispersed salt S being extracted with a non-polar liquid B, the salt S being in the liquid speed B is dispersed, and the salt S-dispersed liquid B is extracted with water, whereby the solid is dissolved in water.
- the older PCT application with the file number PCT/EP2021/056750 describes a process for preparing salts of a,b-unsaturated carboxylic acids from ethene and carbon dioxide.
- the salt is finely dispersed in an organic solvent.
- the organic solvents used are miscible with water. Therefore, the salt must be separated by filtration.
- the disadvantage of the process is that the finely dispersed salt is difficult to filter.
- the object was therefore to find an alternative process for separating finely dispersed salts from an organic solvent.
- the object is achieved by a method for separating a salt S, the salt S being present in a dispersed form in an aprotic polar liquid A, characterized in that
- the liquid B with the dispersed salt S is extracted with water, the solid being dissolved in water, the solubility of the liquid A in the liquid B at 25°C being less than 20% by weight and the solubility of the Salt S in water at 25°C is at least 20% by weight.
- the salt S is preferably an organic salt, more preferably an acrylic acid salt, most preferably sodium acrylate.
- Suitable organic salts are, for example, alkali metal salts of carboxylic acids, for example sodium acetate, sodium propionate, sodium acrylate, potassium acrylate and tripotassium citrate.
- the amount of water in step (b) is chosen such that a preferably at least 25% by weight, particularly preferably at least 30% by weight, very particularly preferably at least 35% by weight, aqueous solution of an acrylic acid salt is obtained becomes.
- An aprotic polar liquid A does not contain heteroatom-hydrogen bonds such as nitrogen-hydrogen bonds and oxygen-hydrogen bonds.
- aprotic polar liquids A examples include dimethylformamide, sulfolane, dimethyl sulfoxide, propylene carbonate, nitromethane, nitrobenzene, benzonitrile or mixtures thereof. Liquid A should contain less than 1% by weight of water.
- the aprotic polar liquid A can additionally contain a secondary or tertiary alkanol, for example 3,7-dimethyloctan-3-ol. These alkanols are used as auxiliaries in the production of acrylic acid salts from ethene and carbon dioxide.
- the alkanol content in the liquid A is usually from 5 to 15% by weight.
- Suitable non-polar liquids B are, for example, alkanes, alkenes, aromatics, trialkylamines, dialkyl ethers or mixtures thereof.
- the salt S should have an average particle size of 3 to 30 ⁇ m and/or a particle size distribution width of less than 3.00.
- the mean particle size is measured by laser diffraction, the mean particle size being the volume-average mean particle size.
- the width of the particle size distribution is determined using the cumulative distribution curve according to (dgo - dio)/(2 x dso), where dm is the particle size for cumulative 10% and dgo is the particle size for cumulative 90% and dso is the mean particle size.
- the particles can also be secondary particles (agglomerates) made up of smaller primary particles with less than 1 ⁇ m.
- the extractions in steps (a) and (b) are preferably carried out at a temperature of 10 to 60°C. Lower temperatures increase the miscibility gap of the solvents used. Higher temperatures require less cooling.
- the ratio of liquid A to liquid B in step (a) is preferably from 1 to 10, particularly preferably from 0.2 to 5, very particularly preferably from 0.5 to 2. Phase separation is facilitated by a phase ratio in these ranges .
- the ratio of liquid B to water in step (b) is preferably from 1 to 100, more preferably from 2 to 50, most preferably from 5 to 20.
- a phase ratio in these ranges facilitates the preparation of concentrated aqueous solutions of the salt S .
- a further object of the present invention is a process for the preparation of acrylic acid salts, comprising
- the ethene partial pressure in step (i) is preferably from 0.5 to 100 bar, particularly preferably from 2 to 80 bar, very particularly preferably from 5 to 50 bar.
- the carbon dioxide in step (i) can be used in gaseous, liquid or supercritical form. It is also possible to use gas mixtures containing carbon dioxide that occur on an industrial scale, provided they do not contain any appreciable amounts of carbon monoxide.
- the carbon dioxide partial pressure in step (i) is preferably from 1 to 200 bar, particularly preferably from 4 to 140 bar, very particularly preferably from 10 to 100 bar.
- the molar ratio of carbon dioxide to ethene is preferably from 0.1 to 15, more preferably from 1 to 10, most preferably from 4 to 8.
- Secondary or tertiary alkanolates are based on secondary or tertiary alkanols.
- Secondary or tertiary alkanols are alkanols whose hydroxy group is on a secondary or tertiary carbon atom.
- Suitable alkoxides are sodium propane-2-olate, sodium tert-butoxide, sodium cyclopentanolate, sodium cyclohexoxide, sodium cycloheptanolate, sodium butane-2-olate, sodium 3-methylbutane-2-olate , Sodium 4-methylbutan-2-olate, Sodium pentan-3-olate, Sodium 1-methoxypropane-2-olate, Sodium 1-methylcyclopentane-1-olate, Sodium 1-methylcyclohexane-1-olate , Sodium 2-phenylpropane-2-olate, Sodium 3-methylheptane-3-olate, Sodium 3-methylhexane-3-olate, Sodium 2-methylhexane-2-olate, Sodium 2-methylbutane-2-olate , sodium 3-ethylpentan-3-olate, sodium 2-methylpentan-2-olate, sodium 3-methylpentan-3-olate, sodium 3,7-dimethyloctane-3-
- the secondary or tertiary alkanolate is consumed stoichiometrically. This creates the corresponding alkanol.
- the secondary or tertiary alkanol can be converted into the corresponding alkoxide with sodium methoxide.
- step (i) ethene and carbon dioxide are reacted in the presence of a carboxylation catalyst.
- Transition metal complexes are usually used as carboxylation catalysts.
- the carboxylation catalysts are used in an amount of preferably from 0.1 to 20,000 ppm by weight, particularly preferably from 1 to 1000 ppm by weight, very particularly preferably from 5 to 500 ppm by weight, based in each case on the reaction mixture.
- Ge suitable transition metals are the transition metals of groups 4, 6, 7, 8, 9 and 10 of the periodic table of the elements. Nickel and palladium are preferred. Palladium is particularly preferred.
- Suitable ligands are 1,2-bis(dicyclohexylphosphino)ethane,
- the transition metal complex can be prepared directly from transition metal with oxidation state 0 and ligand. However, it is also possible to first produce a precursor of the transition metal complex and then to reduce it. Suitable reducing agents are hydrogen, magnesium, sodium and zinc. Suitable precursors of the transition metal complex are bis(cycloocta-1,5-diene) nickel, bis(acetylacetone) nickel, tetrakis(triphenylphosphine) nickel, bis(dibenzilidenacetone)palladium, tris(dibenzilidenacetone) -dipalladium, tetrakis-(triphenylphosphine)palladium, cyclopentadienyl-allyl-palladium, cyclopentadienyl-cinnamyl-palladium or mixtures thereof.
- the reaction in step (i) is carried out at a temperature of preferably 20 to 250°C, particularly preferably 50 to 190°C, very particularly preferably 70 to 180°C.
- the overall pressure is preferably from 1 to 300 bar, particularly preferably from 3 to 200 bar, very particularly preferably from 5 to 150 bar.
- the reaction in step (i) can be carried out in conventional reactors suitable for gaseous/liquid reactions.
- reactors are described, for example, in S. Moran, K.-D. Henkel "Reactor Types and Their Industrial Application", Chapter 3.3 “Reactors for gas-liquid reactions” (Ullmann's Encyclopedia of Industrial Chemistry, Wiley VCH Verlag GmbH & Co KGaA, DOI: 10.1002/14356007. b04_087).
- the aprotic polar liquid A separated off in step (ii) in the extraction (a) can, if appropriate after purification and separation of the alkanol used as an auxiliary and water, be recycled to step (i).
- the non-polar liquid B separated off in step (ii) in the extraction (b) can, if appropriate after purification and separation of the alkanol used as an auxiliary and water, be returned to the extraction (a).
- the resulting aqueous solution of the acrylic acid salt can be purified, for example by filtration with activated charcoal, stripping with steam or distillation. Residues of the carboxylation catalyst can be removed with an ion exchanger.
- the aqueous solution of the acrylic acid salt is suitable for the production of soluble or water-swellable polyacrylic acid salts, in particular to form weakly crosslinked polyacrylic acid salts (superabsorbers).
- Carbon dioxide (330 g, 7.50 mol) and ethene (33.0 g, 1.18 mol) were then injected at 25°C.
- the mixture was then stirred at 145° C. and a total pressure of 83 bar at 750 rpm for 2 hours. After cooling to 50°C, the pressure was released.
- the autoclave was emptied into a 1 l glass bottle and rinsed with 150 ml of dimethylformamide. A dispersion of sodium acrylate was obtained.
- the mean particle size of the agglomerates was 7.8 ⁇ m, the breadth of the particle size distribution was 1.65.
- the dispersion obtained was extracted in a ratio of 1:1 with a non-polar solvent (liquid B).
- the dispersed sodium acrylate passed into the non-polar solvent.
- the non-polar solvent was then extracted with 70 ml of water and the aqueous sodium acrylate obtained was treated with activated charcoal. A pale yellowish solution was obtained.
- the extractions were carried out at a temperature of 23°C.
- the non-polar solvents (liquid B) used were n-pentane, n-hexane, hexane mixtures, n-heptane, n-octane, isooctane, n-nonane, n-decane, n-undecane, n-dodecane, tributylamine, trihexylamine , trioctylamine and tridodecylamine used.
- dimethylformamide containing 70 ml of water in the non-polar solvent was distilled off before the extraction.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21169900 | 2021-04-22 | ||
| PCT/EP2022/059568 WO2022223333A1 (de) | 2021-04-22 | 2022-04-11 | Extraktionsverfahren |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4326412A1 true EP4326412A1 (de) | 2024-02-28 |
Family
ID=75639808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22722696.6A Pending EP4326412A1 (de) | 2021-04-22 | 2022-04-11 | Extraktionsverfahren |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20240208892A1 (de) |
| EP (1) | EP4326412A1 (de) |
| JP (1) | JP2024515353A (de) |
| KR (1) | KR20230174225A (de) |
| CN (1) | CN117177801A (de) |
| BR (1) | BR112023021673A2 (de) |
| SA (1) | SA523451237B1 (de) |
| WO (1) | WO2022223333A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12448346B1 (en) | 2025-06-18 | 2025-10-21 | King Fahd University Of Petroleum And Minerals | Catalytic method for acrylate production |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0780808B2 (ja) * | 1993-09-08 | 1995-08-30 | 財団法人地球環境産業技術研究機構 | 脂肪酸の分離方法 |
| US8461383B2 (en) * | 2009-10-16 | 2013-06-11 | Basf Se | Process for starting up a separating process for purifying removal of acrylic acid crystals from a suspension S of crystals thereof in mother liquor |
| EP2542516A2 (de) * | 2010-03-03 | 2013-01-09 | Basf Se | Herstellung von ethylenisch ungesättigten carbonsäuresalzen durch carboxylierung von alkenen |
| US8642803B2 (en) * | 2010-03-03 | 2014-02-04 | Basf Se | Preparation of ethylenically unsaturated carboxylic salts by carboxylation of alkenes |
| CN102267890B (zh) * | 2010-11-16 | 2014-06-11 | 中国环境科学研究院 | 从丙烯酸酯生产废水中萃取回收丙烯酸的方法 |
| BR112013019323B1 (pt) * | 2011-02-09 | 2019-12-24 | Lucite International Uk Limited | método de extrair ácido (met)acrílico a partir de um meio de reação aquoso, processo para a produção de ácido (met)acrílico, e, método de preparar polímeros ou copolímeros de ácido (met)acrílico ou ésteres de ácido (met)acrílico |
| JP6124911B2 (ja) * | 2011-11-25 | 2017-05-10 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | アルコールの均一系接触アミノ化による親油性ポリアルキレンポリアミン |
| US8697909B2 (en) * | 2011-12-29 | 2014-04-15 | Basf Se | Preparation of α,β-ethylenically unsaturated carboxylic salts by catalytic carboxylation of alkenes |
| DE102014203951A1 (de) * | 2014-03-05 | 2015-09-10 | Evonik Degussa Gmbh | Synthese von alpha,beta-ungesättigten Carbonsäuren (Meth)acrylaten aus Olefinen |
| EP3442939B1 (de) * | 2016-04-11 | 2020-08-26 | Basf Se | Verfahren zur herstellung eines ungesättigten carbonsäuresalzes |
-
2022
- 2022-04-11 CN CN202280029911.XA patent/CN117177801A/zh active Pending
- 2022-04-11 WO PCT/EP2022/059568 patent/WO2022223333A1/de not_active Ceased
- 2022-04-11 JP JP2023564601A patent/JP2024515353A/ja active Pending
- 2022-04-11 EP EP22722696.6A patent/EP4326412A1/de active Pending
- 2022-04-11 BR BR112023021673A patent/BR112023021673A2/pt unknown
- 2022-04-11 KR KR1020237035896A patent/KR20230174225A/ko active Pending
- 2022-04-11 US US18/287,503 patent/US20240208892A1/en active Pending
-
2023
- 2023-10-22 SA SA523451237A patent/SA523451237B1/ar unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN117177801A (zh) | 2023-12-05 |
| JP2024515353A (ja) | 2024-04-09 |
| BR112023021673A2 (pt) | 2023-12-19 |
| US20240208892A1 (en) | 2024-06-27 |
| KR20230174225A (ko) | 2023-12-27 |
| WO2022223333A1 (de) | 2022-10-27 |
| SA523451237B1 (ar) | 2025-05-21 |
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