Process for preparing aspartic acid from ammonium aspartate, and continuous process for preparing polysuccinimide involving such process
US6274698A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Jun 8, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.