Method for purifying an aqueous lactic acid solution
US10604470B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 2017 |
| Grant date | Mar 31, 2020 |
| Priority date | — |
| Expiry date | May 11, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C59/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention concerns a method for purifying an aqueous lactic acid solution, obtained from a fermentation medium or from any other source previously cleared of solid substances and/or of biomass that may be present and ionic substances, characterised in that it comprises the two following steps: a. Concentration of the lactic acid solution until a concentration of between 85 and 95% is reached, preferably of between 90 and 95%, i.e. between 15 and 5% free water or preferably between 10 and 5% free water; b. Distillation in a multi-stage column comprising three areas and allowing the separation, in a single step, of the lactic acid, volatile compounds and the heaviest impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.