Sulfonation of polyhydroxyaromatics
US8492581B2 · kind B2 · utility
19Cited by
6References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2010 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Aug 3, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides improved process for the sulfonation of hydroxyaromatics amenable to direct isolation of the sulfonylated hydroxyaromatics in their free-acid forms. The process allows for the recyclization of sulfuric acid and minimizes waste. The starting materials are from a renewal resource, e.g., biomass, and contain detectable 14C up to a 14C content of 0.0000000001% (one part per trillion). The products made include sulfonated catechol, disulfonated pyrogallol and sulfonated protocatechuic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.