Method of industrial-scale purification of lactic acid
US6630603B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2002 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | Jan 16, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/44
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method of industrial-scale purification of lactic acid, the method including the steps of:(a) reduced-pressure distillation of a concentrated lactic acid solution having a total acid content of at least 95 wt % and a content of monomeric lactic acid of at least 80 wt %, based on the concentrated lactic acid solution, the ratio between the lactic acid enantiomers in the concentrated lactic acid solution not being equal to 1; and(b) subjecting the concentrated lactic acid solution to a crystallization to form a pure lactic acid.The invention also relates to the lactic acid or the lactic acid solution obtained via this method, and the use thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.