Process for the production of alkylpolyglycoside
AssigneeHenkel Corporation
InventorsPatrick M. McCurry, Jr., Brian A. Michel, Carl E. Pickens, Janet R. Varvil
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Abstract
An improved process for preparing an alkylpolyglycoside wherein the alkyl group contains about 8 to about 20 carbon atoms, prepared by reacting a saccharide and an alcohol in the presence of an acid catalyst, and subsequently removing excess unreacted alcohol, the improvement comprising adding to the reaction product an oxide, such as MgO, and removing the excess unreacted alcohol by thin film evaporation under vacuum at temperatures up to about 240.degree. C. under sparging or non-sparging condition with an inert gas.
Claims18
A process of preparing an alkylpolyglycoside comprising the steps of
- (a) reacting a saccharide and an alcohol in the presence of an acid catalyst to provide an alkylpolyglycoside stream containing unreacted alcohol;
- (b) adding to said alkylpolyglycoside stream containing the unreacted alcohol an oxide selected from the group consisting of aluminum oxide, magnesium oxide, calcium oxide and zinc oxide;
- (c) contacting a liquid film of the oxide containing alkylpolyglycoside and alcohol stream with an inert gas at temperatures of from about 140.degree. C. to about 240.degree. C. and a pressure less than about 20 mm Hg to remove the unreacted alcohol and
- (d) recovering a low odor, light color alkylpolyglycoside containing less than about 5% by weight alcohol.
In a process of preparing an alkylpolyglycoside comprising reacting a saccharide with an alcohol in the presence of an acid catalyst in which the alkyl group contains from about 8 to about 22 carbon atoms, neutralizing the acid catalyst and removing the unreacted excess alcohol, the improvement comprising
- (a) partially neutralizing the acid with an amount of a hydroxide just less than the stoichiometric amount necessary to neutralize the catalyst;
- (b) adding to the reaction product of said saccharide and said alcohol an oxide selected from the group consisting of aluminum oxide, magnesium oxide, zinc oxide and calcium oxide;
- and
- (c) heating the reaction product, now containing the oxide, under vacuum in a thin film evaporator, wherein the thin film has a thickness less than about 10 mm, the temperature is about 140.degree. C. to about 240.degree. C. and the vacuum is from about 0.1 to about 20 mm of mercury.
Dependencies are inferred from the claim text.