Process for preparing L-aspartic acid
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United States of America Patent
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Sep 14, 1999
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N/A
app pub date -
Dec 29, 1998
filing date -
Dec 29, 1997
priority date (Note) -
Expired
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Abstract
An improved process for preparing L-aspartic acid by enzyme-catalyzed reaction of fumaric acid with ammonia, in which, after reaction has been completed, excess ammonia is removed from the reaction mixture, L-aspartic acid is precipitated by adding acetic acid or formic acid, whereupon formic acid and acetic acid are rereleased from the mother liquor by adding fumaric acid, and the ammonia released and the liberated formic or acetic acid and the ammonium fumarate formed in the liberation are reused for subsequent cycles.
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