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US 10,370,620 B2Granted
Method for producing polyaspartic acid under reflux cooling
AssigneeBASF SE
InventorsGazi Tuerkoglu, Juergen Detering, Dietrich Fehringer, Christian Benz
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Abstract
Provided herein is a method for producing polyaspartic acid under reflux cooling. Further provided herein are compositions including polyaspartic acid obtainable through the method. Also provided herein is a use of polyaspartic acids obtainable through the method in dishwashing agents, detergents, and cleaning agents.
Claims10
A method for producing polyaspartic acid, the method comprising:
- (a) contacting a mixture of:
- (i) aspartic acid, and
- (ii) 1 to 25 mol % of an acidic catalyst;
- in a reactor;
- (b) heating the mixture according to (a) under reflux cooling without distillative removal of water at a reaction temperature of 100 to 220° C. up to a degree of conversion of the aspartic acid of at least 1%;
- (c) polycondensing the reaction mixture according to (b) with simultaneous distillative removal of water at 170 to 250° C. to produce polycondensates;
- and
- (d) hydrolyzing the polycondensates according to (c) with addition of a base.
5 more elements
Dependencies are inferred from the claim text.