Purification of crude isophthalic acid
US4937378A · kind A · utility
8Cited by
5References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1989 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Oct 13, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/487
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Solutions of crude isophthalic acid are purified by hydrogenation to provide purified isophthalic acid having a predetermined color scale b*-value or optical density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.