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US 5,206,357 AGranted
Process for the preparation of alkyl glycosides and alkyl polyglycosides
AssigneeHuels Aktiengesellschaft
InventorStefan Schmidt
Life of this patent
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Abstract
Alkyl glycosides and alkyl polyglycosides are prepared by reacting saccharides and alcohols having 12 to 20 C atoms by acid catalysis in the presence of sodium hypophosphite and up to 1.3% by water, relative to the total of saccharides and alcohols, the molar ratio of saccharide to alcohol ranging from 1:5 to 1:10; and, after reaction is complete, neutralizing the reaction medium with an alkali metal hydroxide dissolved in an alcohol having 1 to 4 C atoms.
Claims12
A method for the preparation of alkyl glycosides and alkyl polyglycosides from which transparent aqueous solutions having good color can be prepared comprising:
- reacting saccharides and alcohols having 12 to 20 carbon atoms by acid catalysis in the presence of sodium hypophosphite and up to 1.3% by weight water, relative to the total of saccharides and alcohols, the molar ratio of saccharide to alcohol ranging from 1:5 to 1:10;
- and, after reaction is complete,
- neutralizing the reaction medium with an alkali metal hydroxide dissolved in an alcohol having 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.