Chemical processes for preparing citric acid
US4056567A · kind A · utility
12Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1976 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | Mar 8, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/41
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel chemical processes are disclosed for the conversion of cis-aconitic acid, trans-aconitic acid, isocitric acid, alloisocitric acid and mixtures thereof into citric acid. The processes comprise heating selected alkaline earth metal salts of the aconitic and isocitric acids in an aqueous medium in the presence of alkali metal hydroxides or, preferably, selected alkaline earth metal hydroxides at elevated temperatures to produce the corresponding salts of citric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.