Process for producing stable, low odor S,S,S-tributylphosphorothrithiote
US5831112A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1997 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/17
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention is directed to a process for producing a stable, low odor S,S,S-tributylphosphorotrithioate having a level of dibutyl disulfide of 0.3% by weight or less. The process broadly includes the steps of PA1 a) reacting S,S,S-tributylphosphorotrithioite with an oxidizing agent to produce a crude S,S,S-tributylphosphorotrithioate, PA1 b) treating the crude product with sodium bisulfite to decompose any excess oxidizing agent, PA1 c) adding a caustic solution having a caustic concentration of from 25 to 50% by weight directly to the reaction mixture of step b), the addition of said caustic solution being stopped once the total caustic concentration is less than 10% by weight and once the pH is constant, and PA1 d) phase separating S,S,S-tributylphosphorotrithioate from the mixture of step c).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.