EP0146771B1 - Procédé de production d'alcoolates alcalins - Google Patents

Procédé de production d'alcoolates alcalins Download PDF

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Publication number
EP0146771B1
EP0146771B1 EP84113888A EP84113888A EP0146771B1 EP 0146771 B1 EP0146771 B1 EP 0146771B1 EP 84113888 A EP84113888 A EP 84113888A EP 84113888 A EP84113888 A EP 84113888A EP 0146771 B1 EP0146771 B1 EP 0146771B1
Authority
EP
European Patent Office
Prior art keywords
alkali metal
alcohol
space
ions
liberated
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.)
Expired
Application number
EP84113888A
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German (de)
English (en)
Other versions
EP0146771A3 (en
EP0146771A2 (fr
Inventor
Carl H. Prof. Hamann
Jürgen Schneider
Peter Dr. Schmittinger
Rudolf Dr. Stephan
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.)
Huels AG
Original Assignee
Huels AG
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 Huels AG filed Critical Huels AG
Publication of EP0146771A2 publication Critical patent/EP0146771A2/fr
Publication of EP0146771A3 publication Critical patent/EP0146771A3/de
Application granted granted Critical
Publication of EP0146771B1 publication Critical patent/EP0146771B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B3/00—Electrolytic production of organic compounds
    • C25B3/20—Processes
    • C25B3/25—Reduction

Definitions

  • the invention relates to a method for producing alkali alcoholates of the type described in the preamble of claim 1.
  • a large-scale industrial process for producing simple alcoholates is linked to chlor-alkali electrolysis using the amalgam process.
  • the object of the invention is to enable the electrolytic production of alcoholates from the alcohol in question and an alkali metal compound, bypassing the amalgam process.
  • This object is achieved with the invention. It consists in that in a process of the type mentioned at the outset for the production of alkali alcoholates from a monohydric aliphatic alcohol having 1 to 4 carbon atoms and a dissociable compound of the respective alkali metal in an electrolysis cell, the anode compartment and the cathode compartment are separated by a cation exchange membrane and in the cathode compartment with evolution of hydrogen from the alcohol alcoholate anions and in the anode compartment from the alkali metal compound alkali metal ions are released and the latter are transported through the cation exchange membrane into the cathode compartment.
  • the alcoholate anion is released from the alcohol with evolution of hydrogen.
  • alkali metal ions are released by electrooxidation from an alkali metal compound added in the anolyte or by oxidation of a further starting material and transported through the membrane into the catholyte, where the desired product is formed.
  • the solvent on the anode side can be the alcohol itself. Because of the low conductivities that can be achieved in the solvents in question, the electrode spacing should be minimized as far as possible.
  • stirring the catholyte and the anolyte is advantageous to ensure adequate mass transport speeds.
  • the two-part test electrolysis cell used for carrying out the tests for Examples 1 to 3 has riser pipes for gas outlet from both electrolysis chambers and devices for loading and emptying the anode and cathode compartments.
  • the membrane is clamped between the flanges of the two cell halves or the like by means of a screw. pressed together and sealed by an O-ring lying in a groove.
  • Bare platinum electrodes serve as electrodes.
  • the experiments shown in the examples were carried out with current densities of about 1.7 kA. m-2 performed with galvanostatic switching.
  • the platinum electrodes are arranged at a distance of 2 to 4 mm on both sides of the exchange membrane.
  • a methanolic 0.4 N sodium methoxide solution was used as the catholyte.
  • the cathode reaction obeys the following relationship:
  • the anolyte consisted of a 1.4 N CH 3 COONa, 1.2 N CH 3 COOH methanolic solution.
  • the anode reaction is based on the following relationship anodically discharge the acetate ion and thus release Na + .
  • the hydrolysis product of a copolymer of tetrafluoroethylene and perfluorosulfonyl vinyl ether (Nafion membrane 214 ( R ), commercially available) was used as the membrane.
  • the cell response is given as follows: The theoretical yield with an electrolysis time of 2 hours would correspond to a product amount of 90 mmol CH 3 0Na. The indicated yield of 73 mmol was determined by back titration of the catholyte.
  • a solution of 1N NaClo 4 in methanol is used as the anolyte.
  • the solvent methanol itself is the anodic feed that is oxidized, whereupon perchloric acid remains behind due to the transport of Na + ions through the membrane.
  • the composition of the catholyte and the cathode reaction are identical to those in Examples 1 and 2.
  • the anode reaction is assumed in accordance with the following relationships: Under the otherwise analogous conditions as in Examples 1 and 2, a Faraday current efficiency of 57% is achieved with an electrolysis voltage of 7 V.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Claims (4)

1. Procédé de production d'alcoolates alcalins à partir d'un monoalcool aliphatique avec 1 à 4 atomes de C et d'un composé dissociable du métal alcalin concerné sous forme d'une solution, d'une suspension ou d'une émulsion avec participation d'un alcool, caractérisé en ce que, dans une cellule d'électrolyse, le compartiment anodique et le compartiment cathodique sont séparés par une membrane échangeuse de cations, que des anions alcoolate sont libérés dans le compartiment cathodique à partir de l'alcool avec dégagement d'hydrogène et des ions de métal alcalin sont libérés dans le compartiment anodique à partir du composé de métal alcalin et que ces derniers sont transportés dans le compartiment cathodique à travers la membrane échangeuse de cations.
2. Procédé selon la revendication 1, caractérisé en ce que des ions de métal alcalin sont libérés dans le compartiment anodique par électro-oxydation à partir d'un composé de métal alcalin dissociable et sont transportés dans le compartiment cathodique à travers la membrane échangeuse de cations avec formation d'un alcoolate de métal alcalin en solution alcoolique ou sous forme de précipité.
3. Procédé selon la revendication 1, caractérisé en ce qu'un nouveau partenaire est mis à la disposition du contre-ion du composé de métal alcalin par oxydation de l'alcool proprement dit ou d'un autre produit de mise en oeuvre et que l'ion de métal alcalin est ainsi libéré et transporté à travers la membrane échangeuse de cations.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que
a) un monoalcool aliphatique avec 1 à 4 atomes de C est mis en oeuvre,
b) une solution de l'alcoolate de métal alcalin dans l'alcool concerné est introduite dans le compartiment cathodique et une solution d'un composé de métal alcalin dans un alcool est chargé dans le compartiment anodique,
c) des ions alcoolate sont libérés par voie électrolytique dans le compartiment cathodique avec dégagement d'hydrogène et les ions alcalins sont libérés dans le compartiment anodique à partir du composé de métal alcalin et transportés à travers la membrane dans le compartiment cathodique,
d) la solution d'alcoolate alcalin formée dans le compartiment cathodique est soutirée et les pertes correspondantes dans les compartiments anodique et cathodique sont compensées.
EP84113888A 1983-12-21 1984-11-16 Procédé de production d'alcoolates alcalins Expired EP0146771B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3346131A DE3346131C2 (de) 1983-12-21 1983-12-21 Verfahren zur Herstellung von Alkalialkoholaten
DE3346131 1983-12-21

Publications (3)

Publication Number Publication Date
EP0146771A2 EP0146771A2 (fr) 1985-07-03
EP0146771A3 EP0146771A3 (en) 1986-12-10
EP0146771B1 true EP0146771B1 (fr) 1989-05-03

Family

ID=6217517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113888A Expired EP0146771B1 (fr) 1983-12-21 1984-11-16 Procédé de production d'alcoolates alcalins

Country Status (2)

Country Link
EP (1) EP0146771B1 (fr)
DE (2) DE3346131C2 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4233191C2 (de) * 1992-01-16 1995-06-29 Huels Chemische Werke Ag Verfahren zur Herstellung von Alkoholaten
DE4237333A1 (de) * 1992-11-05 1994-05-11 Salzgitter Anlagenbau Ein elektrochemisches Verfahren zur Regenerierung des Katalysators bei der Methylformiatsynthese
US5425856A (en) * 1994-04-26 1995-06-20 Occidental Chemical Corporation Method of making alkali metal alcoholates
EP1312700A3 (fr) * 2001-11-02 2003-05-28 Degussa AG Procédé pour la production d'alcoolats de metaux alcalins
WO2005059205A2 (fr) 2003-12-11 2005-06-30 American Pacific Corporation Procede electrolytique de fabrication d'alcoolates d'alcali au moyen de membranes solides ceramiques conduisant les ions
US8075758B2 (en) 2003-12-11 2011-12-13 Ceramatec, Inc. Electrolytic method to make alkali alcoholates using ion conducting alkali electrolyte/separator
US7824536B2 (en) 2003-12-11 2010-11-02 Ceramatec, Inc. Electrolytic method to make alkali alcoholates using ceramic ion conducting solid membranes
DE10360758A1 (de) * 2003-12-23 2005-07-28 Degussa Ag Elektrochemische Herstellung von Alkalialkoholaten mit Hilfe einer keramischen Festelektrolytmembran
WO2007075865A2 (fr) 2005-12-20 2007-07-05 Ceramatec, Inc. Processus électrolytique pour obtenir de l’hypochlorite de sodium à l’aide de membranes de céramique conductrice à ion de sodium
CN112226782B (zh) * 2020-09-15 2021-06-29 安徽金邦医药化工有限公司 一种固体甲醇钠的精制工艺
CN117586506A (zh) 2022-08-12 2024-02-23 赢创运营有限公司 烷氧基硅氧烷的制备
CA3208899A1 (fr) 2022-08-12 2024-02-12 Evonik Operations Gmbh Production d~alkoxysiloxanes
CA3208911A1 (fr) 2022-08-12 2024-02-12 Evonik Operations Gmbh Procede de production d~alkoxysiloxanes a partir de silicone recycle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438963A (en) * 1942-10-17 1948-04-06 Mathieson Alkali Works Inc Manufacture of alkali metal alcoholates
US4250000A (en) * 1979-03-26 1981-02-10 Stauffer Chemical Company Electrochemical process for metal alkoxides

Also Published As

Publication number Publication date
DE3478038D1 (en) 1989-06-08
EP0146771A3 (en) 1986-12-10
EP0146771A2 (fr) 1985-07-03
DE3346131A1 (de) 1985-06-27
DE3346131C2 (de) 1986-07-10

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