Process for recovering hydrogen in producing pure terephthalic acid
US6407286B1 · kind B1 · utility
0Cited by
3References
2Claims
0Family size
Inventors
Key dates
| Filing date | Jan 14, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Jan 14, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/129
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for recovering and recycling excess hydrogen from process vent streams in the production of highly pure terephthalic acid where the production of the pure terephthalic acid comprises catalytically hydrogenating impure terephthalic acid, which typically contains 4-carboxybenzaldehyde (4-CBA), color bodies and other impurities, in aqueous liquid phase solution at elevated temperature and pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.