Process for preparing saturated .omega.-amino acids
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United States of America Patent
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May 11, 1982
Grant Date -
N/A
app pub date -
Mar 18, 1980
filing date -
Mar 21, 1979
priority date (Note) -
Expired
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Abstract
A process for continuous or batch preparation of an .omega.-amino-acid is scribed, comprising the imination of an unsaturated aldehyde acid, the catalytic reduction in a single hydrogenation step of the imine of the ethylenically unsaturated straight chain .omega.-aldehyde acid in the presence of ammonia and an alkaline metal hydroxide whereby the alkaline salt of the imine is obtained, and the acidification of the alkaline salt of the .omega.-amino acid. The imine of formyl alkenoic acid is prepared at most at room temperature adding the acid to an ammonia solution of above 10%, then adding NaOH solution to the ammonia solution. The reductive imination is effectuated in two steps, first at 100.degree.-150.degree. C. and the second at 150.degree.-180.degree. C. under a 20-70 Ate pressure in the presence of a nickel catalyst. High yield and only few by-products are obtained.
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