Production of D,L-aspartic acid

Details Production of D,L-aspartic acid Production of D,L-aspartic acid

1996-06-10

1999-02-16

Krass, Frederick

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

526571, C07C22700, C07C22900

Patent

active

058722858

ABSTRACT:
The present invention is directed to a method for the production of D,L-aspartic acid. The method comprises reacting an unsaturated dicarboxylic acid or anhydride, such as, maleic acid, fumaric acid, maleic anhydride, or mixtures thereof, with excess aqueous ammonia at an elevated temperature and pressure for a time sufficient to produce diammonium D,L-aspartate. The produced diammonium D,L-aspartate is then neutralized to D,L-aspartic acid. Excess unreacted ammonia and various by-products may be recycled and re-used in the method, thereby minimizing waste and reducing cost. The produced D,L-aspartic acid may be subsequently used to make polyaspartic acid.

REFERENCES:
patent: 4839461 (1989-06-01), Boehmke et al.
patent: 5219952 (1993-06-01), Koskan et al.
patent: 5292858 (1994-03-01), Wood
patent: 5373088 (1994-12-01), Koskan et al.
patent: 5491213 (1996-02-01), Batzel

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