Back to results
US 6,320,071 B1Granted
Production of 2-carboxyalkyl (phenyl)phosphinic acid
AssigneeSolutia Inc.
InventorsDavid J. Weinkauff, Frank E. Paulik
Life of this patent
Estimating the term…
Abstract
Processes for producing 2-carboxyalkyl(phenyl)phosphinic acid comprising hydrolyzing the reaction mixture produced from the reaction of dichloro(phenyl)phosphine with a carboxylic acid in the presence of water, wherein the hydrolysis is conducted with reduced levels of water.
Claims17
A process for producing 2-carboxyalkyl(phenyl)phosphinic acid comprising:
- (a) admixing water and a first reaction mixture comprising the products of the reaction of dichloro(phenyl)phosphine and a carboxylic acid selected from acrylic acid or methacrylic acid, and
- (b) hydrolyzing said reaction products to produce a second reaction mixture comprising 2-carboxyalkyl(phenyl)phosphinic acid;
- wherein the amount of water admixed with said first reaction mixture in step (a) is about 2 to about 7.5 moles water per mole of dichloro(phenyl)phosphine charged to the reaction between dichloro(phenyl)phosphine and carboxylic acid.
A process for producing 2-carboxyalkyl(phenyl)phosphinic acid comprising:
- (a) admixing water and a first reaction mixture comprising the products of the reaction of dichloro(phenyl)phosphine and a carboxylic acid selected form acrylic acid or methacrylic acid, and
- (b) hydrolyzing said reaction products to produce a second reaction mixture comprising 2-carboxyalkyl(phenyl)phosphinic acid, and simultaneously removing at least a portion of the HCl present during the hydrolysis reaction;
- wherein the amount of water admixed with said first reaction mixture in step (a) is the amount effective to enable removal of at least about 20% of the theoretically available chlorine in said first reaction mixture during the hydrolysis.
Dependencies are inferred from the claim text.