Method for the purification of a-hydroxy acids on an industrial scale
US7223885B2 · kind B2 · utility
13Cited by
2References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2001 |
| Grant date | May 29, 2007 |
| Priority date | — |
| Expiry date | Nov 19, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/43
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method for the purification of an α-hydroxy acid on an industrial scale, in which an α-hydroxy acid with a color (fresh) of not more than 10,000 APHA units is subjected to (a) a crystallization step followed by (b) a distillation step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.