Process for removing silanes from by-product stream
US5493042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1995 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Jun 15, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62D2101/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for treating a by-product stream, resulting from the commercial manufacture of methylchlorosilanes, to remove residual silanes where the residual silanes comprise low-boiling hydrosilanes. The process comprises a first step where the by-product stream is contacted with hydrogen chloride in the presence of a chlorination catalyst to convert the low-boiling hydrosilanes to chlorosilanes. In a second step, the modified by-product stream comprising the chlorosilanes is contacted with activated carbon which adsorbs higher-boiling silanes including chlorosilanes, thereby forming a final by-product stream reduced in lower-boiling hydrosilanes and in total silanes. The present process is especially useful for removing silanes from by-product streams intended for incineration, thus reducing silica during combustion of the by-product stream in the incinerator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.