Preparation of thionyl chloride and phosphorus oxyhloride from sulfur dioxide
US5498400A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Jan 28, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00186
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process to manufacture high purity thionyl chloride and phosphorus oxychloride utilizing a fluctuating flow of sulfur dioxide. Chlorine, sulfur dioxide, and phosphorus trichloride are reacted in a process that limits the amount of sulfuryl chloride and/or phosphorus trichloride remaining in the product stream. Cl.sub.2 and SO.sub.2 are first reacted to form SO.sub.2 Cl.sub.2, which, in turn, is reacted with excess PCl.sub.1 to form the products, POCl.sub.3 and SOCl.sub.2. Any excess PCl.sub.3 is then reacted with additional Cl.sub.2 and SO.sub.2 to form additional product. Alternatively, Cl.sub.2, SO.sub.2, and PCl.sub.13 are reacted directly to form POCl.sub.3 and SOCl.sub.2 without the formation of any SO.sub.2 Cl.sub.2 intermediate by utilizing a continuous stirred loop reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.