Preparation of boron trichloride
US4213948A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1979 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | May 29, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B35/061
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Boron trichloride is prepared by free-radical chlorination of liquid borate ester, e.g., trimethyl borate, at temperatures of between about 20.degree. C. and 100.degree. C. Color bodies which form and accumulate in the liquid reaction mixture are removed by extracting a purge fraction of the reaction mixture from the reactor, distilling such liquid reaction mixture, and recycling distillate obtained from the distillation to the reactor. The volume of the purge fraction can vary between about 4 and about 20 volume percent of the reaction mixture per hour. Borate ester can be added to the distillate before introducing it into the reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.