Method for the purification of an alpha-hydroxy acid on an industrial scale
US7002039B2 · kind B2 · utility
2Cited by
1References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2001 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Sep 14, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/43
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a method for the purification of a fermentatively prepared 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 at least two crystallization steps, with the crystallization steps being carried out in cooling crystallization devices, melting crystallization devices, evaporative crystallization devices and/or adiabatic crystallization devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.