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US 4,973,725 AGranted
Direct synthesis process for organohalohydrosilanes
AssigneeUnion Carbide Chemicals and Plastics Company Inc.
InventorsKenrick M. Lewis, Rudolph A. Cameron, Jeffrey M. Larnerd, Bernard Kanner
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Abstract
Direct Synthesis processes for the selective production of organohalohydrosilanes at high rates, selectivities and conversions by the catalytic reaction of activated silicon with mixtures of organohalides and hydrogen in the presence of controlled concentrations of selected metal atoms.
Claims30
A Direct Synthesis process for the selective production of organohalohydrosilanes of the general formula:
- R.sub.a H.sub.b SiX.sub.c (I)
- by the reaction of activated silicon with a mixture of an organohalide of the general formula:
- RX
- and hydrogen in contact with a catalytic amount of catalyst at elevated temperature, in which:
- R is a hydrocarbyl group having up to about 20 carbon atoms;
- X is a halogen atom;
- and
- a, b and c are integer having a value of 1 or 2 with the proviso that the sum of a plus b plus c is 4 wherein the concentration of the following metal atoms in the activated silicon bed are as follows:
- (i) Zn, Sb and Cd, individually or totally, less than 0.05 weight percent of the silicon;
- (ii) Sn, less than 0.01 weight percent of the silicon;
- (iii) Ni, from about 0.001 to about 0.02 weight percent of the silicon;
- (iv) Cr, from about 0.001 to about 0.06 weight percent of the silicon;
- and
- (v) Cu, up to about 10 weight percent of the silicon.
11 more elements
An activated silicon composition for use in the Direct Synthesis of organohalohydrosilanes of the general formula:
- R.sub.a H.sub.b SiX.sub.c (I)
- by the reaction of activated silicon with a mixture of an organohalide of the general formula:
- RX
- and hydrogen comprising silicon and
- (i) Zn, Sb and Cd, individually or totally, less than 0.05 weight percent of the silicon;
- (ii) Sn, less than 0.01 weight percent of the silicon;
- (iii) Ni, from about 0.001 to about 0.02 weight percent of the silicon;
- (iv) Cr, from about 0.001 to about 0.06 weight percent of the silicon;
- and
- (v) Cu, up to about 10 weight percent of the silicon.
7 more elements
Dependencies are inferred from the claim text.