Process for the production of erythorbic acid
US6172242A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1999 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Apr 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D315/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention provides a process for the recovery of erythorbic acid from an aqueous feed solution containing values of erythorbic acid at a concentration of less than 0.7 mol/kg, comprising extracting said erythorbic acid with a water-immiscible organic extractant composition comprising at least one secondary or tertiary alkyl amine in which the aggregate number of carbon atoms is at least 20, as a primary extractant, and a polar extraction enhancer compound; wherein said extractant composition comprises at least 2 moles of said polar extraction enhancer compound per one mole of primary extractant; separating said erythorbic acid-containing organic extractant composition from residual aqueous solution, and subjecting said erythorbic acid-containing organic extractant composition to a stripping operation with aqueous solution at a temperature of at least 20.degree. C. higher than the temperature at which said extraction is carried out; whereby there is obtained an aqueous solution of erythorbic acid in which the concentration of erythorbic acid is higher than its concentration in said aqueous feed solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.