Multi-stage glycolic acid crystallization
US7439391B2 · kind B2 · utility
14Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2007 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Oct 11, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/43
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a high yield process to prepare high purity crystalline glycolic acid using a multi-loop crystallization process characterized by high liquid and/or solid recycle, said process suitable for large scale purification and producing high purity glycolic acid with low diglycolic acid content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.