Organic compounds -- part of the class 532-570 series – Organic compounds – Silicon containing
Reexamination Certificate
2002-07-30
2004-04-06
Barts, Samuel (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Silicon containing
Reexamination Certificate
active
06717004
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for making alkylhalosilanes. More particularly, the present invention relates to a method for making alkylhalosilanes which includes silicon, alkyl halide and copper catalyst.
Rochow, U.S. Pat. No. 2,380,995 discloses preparing a mixture of alkylhalosilanes by a direct reaction between powdered silicon and an alkyl halide in the presence of a copper-silicon alloy. This reaction is commonly referred to as the “direct method” or “direct process.” The reaction can be summarized as follows:
where Me is methyl.
In addition to the above methylchlorosilanes, “residue” is also formed during the production of methylchlorosilane crude. Residue means products in the methylchlorosilane crude having a boiling point greater than about 70° C., at atmospheric pressure. Residue consists of materials such as disilanes for example, symmetrical 1,1,2,2-tetrachlorodimethyldisilane; 1,1,2-trichlorotrimethydisilane; disiloxanes; disilymethylenes; and other higher boiling species for example, trisilanes; trisiloxanes; trisilmethylenes; etc.
Generally, it is desirable to yield high rates of production in the methylchlorosilane reaction as well as selectively produce dimethyldichlorosilane over the other products. New techniques are constantly being sought to improve the alkylhalosilane reaction.
SUMMARY OF THE INVENTION
The present invention provides a method for making alkylhalosilanes comprising reacting an alkyl halide and silicon in the presence of a copper catalyst comprising copper powder, particulated copper, copper flake, or combinations thereof and at least one co-catalyst.
REFERENCES:
patent: 2380995 (1945-08-01), Rochow
patent: 5712405 (1998-01-01), Nakayama et al.
patent: 5783721 (1998-07-01), Tsumura et al.
patent: 6211394 (2001-04-01), Kalchauer et al.
patent: 6218562 (2001-04-01), Aramata et al.
patent: 6239304 (2001-05-01), Aramata et al.
patent: 6258970 (2001-07-01), Ward et al.
patent: 6365766 (2002-04-01), Aramata et al.
patent: 2002/0156310 (2002-10-01), Inokai et al.
“Catalzyed Direct Reactions of Silicon”—Commercial Production of Silanes by the Direct Synthesis—B. Kanner, K.M. Lewis—1993—pp. 1-66.
“Silicon in Organic, Organometallic, and Polymer Chemistry”—Michael A. Brook—pps. 382-384—1955.
Crawford Alan Carson
Lewis Larry Neil
Barts Samuel
Caruso Andrew J.
Patnode Patrick K.
LandOfFree
Method for making alkylhalosilanes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for making alkylhalosilanes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for making alkylhalosilanes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3258285