Henkel & Cie G.m.b.h.

Horst-Jurgen Krause

Gunther Tischbirek

A process for the production of ether polycarboxylic acids comprising reacting alkali metal salts of ether carboxylic acids with carbon dioxide in the presence of an alkali metal alkoxy-silano-carbonate and, optionally, inert diluents at temperatures of 200.degree.C to 350.degree.C under pressure, acidify the resulting alkali metal salt of an ether polycarboxylic acid and recovering said ether polycarboxylic acid.

Process for the production of ether polycarboxylic acids

A process for the production of ether polycarboxylic acids comprising reacting alkali metal salts of ether carboxylic acids with carbon dioxide in the presence of a silicon compound selected from the group of alkali metal alkoxy-silanolates and alkali metal alkoxy-polysiloxanolates and, optionally, inert diluents at temperatures of 200.degree. to 350.degree.C under pressure, acidify the resulting alkali metal salt of an ether polycarboxylic acid and recovering said ether polycarboxylic acid.

A process for the production of ether polycarboxylic acids comprising reacting alkali metal salts of ether carboxylic acids with carbon dioxide in the presence of (1) an alkali metal alcoholate and (2) optionally, heavy metal catalysts and inert diluents at temperatures of 200.degree.C to 350.degree.C under pressure, acidify the resulting alkali metal salt of an ether polycarboxylic acid and recovering the ether polycarboxylic acid.

Method for manufacturing ether polycarboxylic acids

A process for the production of ether polycarboxylic acids comprising reacting alkali metal salts of ether carboxylic acids with carbon dioxide in the presence of (1) an alkali metal alkyl carbonate and (2) optionally, heavy metal catalysts and inert diluents at temperatures of 200.degree.C to 350.degree.C under pressure, acidify the resulting alkali metal salt of an ether polycarboxylic acid and recovering the ether polycarboxylic acid.

Method for preparation of ether polycarboxylic acids

A process for the production of ether polycarboxylic acids comprising reacting alkali metal salts of ether carboxylic acids with carbon dioxide in the presence of (1) an alkaline compound selected from the group of alkali metal carbonates, bicarbonates and hydroxides and (2) optionally, heavy metal catalysts and inert diluents at temperatures of 200.degree.C to 350.degree.C under pressure, acidify the resulting alkali metal salt of an ether polycarboxylic acid and recovering said ether polycarboxylic acid.

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Dusseldorf-Holthausen, Germany

Horst-Jurgen Krause