Chlorosulfonic acid composition
US4891196A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1986 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Dec 16, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/466
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to an improved chlorosulfonic acid (CSA) composition useful in making a high clarity sulfated salt of a C.sub.8-22 natural or synthetic predominantly straight chain aliphatic primary alcohol to a process for making the improved CSA composition and to improved CSA composition by the process. The CSA contains less than 1 weight percent sulfuric acid, less than 0.47 weight percent sulfur trioxide, less than 5 parts per million iron and less than 0.5 relative percent pyrosulfuryl chloride. The CSA process involves contacting the hydrogen chloride and sulfur trioxide at the point of reaction with from 0.75 to 1.5 weight percent sulfuric acid based on the stoichiometric rate of CSA produced from the sulfur trioxide with an excess of hydrogen chloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.