Process for sulfonation
US4086256A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1976 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Jul 12, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C303/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Sulfonation of a sulfonatable organic compound is effected by means of a two-stage reaction with an SO.sub.3 -containing gas, in which the first-stage reaction is carried out by flowing, in parallel flow relation, said organic compound and said SO.sub.3 -containing gas upwardly into the lower ends of a plurality of vertically positioned cylinders or double-cylinders, and the second-stage reaction is carried out by the steps of collecting the reaction product of the first-stage reaction, adding fresh SO.sub.3 -containing gas to the reaction product thus collected and flowing in parallel flow arrangement the reaction mixture downwardly into the upper end of a vertically positioned cylinder or double-cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.