Process for the recovery of citric acid
US7411090B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2004 |
| Grant date | Aug 12, 2008 |
| Priority date | — |
| Expiry date | Mar 3, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention provides a process for the recovery of citric acid from an aqueous solution feed stream originating in fermentation of carbohydrates and utilizing an amine solvent extraction step for separation of impurities comprising: subjecting said aqueous solution feed stream A to a treatment for partial recovery of citric acid, wherein said treatment is other than amine solvent extraction, to form a first portion of purified citric acid B and a secondary feed stream F; subjecting at least a portion G of said secondary feed stream F to a treatment consisting of amine solvent extraction to form a second portion of purified citric acid solution and to reject substantial of impurities initially present in said portion of said secondary feed stream; subjecting said second portion of purified citric acid solution to crystallization; and recycling mother liquor from said crystallization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.