Process for removing silanes from by-product stream

Details Process for removing silanes from by-product stream Process for removing silanes from by-product stream

1995-06-15

1996-02-20

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C07F 708

Patent

active

054930421

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.

REFERENCES:
patent: 4297500 (1981-10-01), Finke et al.
patent: 4985579 (1991-07-01), Bokerman et al.
patent: 5292909 (1994-03-01), Chadwick et al.
patent: 5292912 (1994-03-01), Chadwick et al.
patent: 5302736 (1994-04-01), Kalchauer et al.
patent: 5321147 (1994-06-01), Chadwick et al.
Sommer et al., J. Org. Chem. 32:2470-2472 (1967).

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