Production of sulfonated amines
US4808342A · kind A · utility
2Cited by
0References
6Claims
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Assignee
Inventors
Key dates
| Filing date | Apr 9, 1986 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Apr 9, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of sulfonated aromatic amines is disclosed based upon starting with the corresponding amine reacted with sulfuric acid in the presence of a sufficient excess of sulfuric acid to act as the reaction solvent. The sulfuric acid excess in the case of sulfanilic acid, the most common of these sulfonated amines and exemplified herein is an aniline:sulfuric acid ratio in the range 1:2.0 to 1:2.5. The reaction, with recycling of the excess acid, provides substantially 100% yield of high quality sulfonated aromatic amine with effectively no effluent but the product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.