Process for preparing aspartic acid from ammonium aspartate, and continuous process for preparing polysuccinimide involving such process
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United States of America Patent
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Aug 14, 2001
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N/A
app pub date -
Jun 8, 2000
filing date -
Aug 19, 1998
priority date (Note) -
Expired
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Abstract
The invention relates to a process for the preparation of aspartic: acid by decomposition of ammonium aspartate wherein a concentrated aqueous solution of ammonium aspartate is continuously introduced into a diluent in which water has a low solubility, which diluent is maintained at a temperature at which ammonium aspartate decomposes into aspartic acid and ammonia, and wherein the water and the formed ammonia are continuously removed. The invention also relates to a process for preparing polysuccinimide starting from fumaric acid or maleic acid and ammonia involving said process for preparing aspartic acid from ammonium aspartate.
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