Dow Corning Corporation

Dow Silicones Corporation

Robert Thomas Larsen

Dimitris Katsoulis

Matthew J McLaughlin

Jonathan David Wineland

Aswini K Dash

Charles Alan Hall

Wendy Sparschu

Unnikrishnan R Pillai

Stephanie Berger

Michael W Toepke

Robert Morgan

Aaron Coppernoll

Krishna Janmanchi

Catharine Horner

Kurt E Anderson

A method of making a trihalosilane comprising contacting an organotrihalosilane according to the formula RS1X3 (I), wherein R is C-Chydrocarbyl and each X independently is halo, with hydrogen, wherein the mole ratio of the organotrihalosilane to hydrogen is from 0.009:1 to 1:2300, in the presence of a catalyst comprising a metal selected from (i) Re, (ii) a mixture comprising Re and at least one element selected from Pd, Ru, Mn, Cu, and Rh, (iii) a mixture comprising Ir and at least one element selected from Pd and Rh, (iv) Mn, (v) a mixture comprising Mn and Rh, (vi) Ag, (vii) Mg, and (viii) Rh at from 300 to 800&#xb0; C. to form a trihalosilane.

Method of making a trihalosilane

An electrolytic process may be used to generate reactive metal silicides with Group 1 metals of the periodic table and/or Group 2 metals of the periodic table, and/or aluminum. Exemplary reactive metal silicides include magnesium silicide (MgSi).

Electrolytic process to silicides

The present invention relates to a method for separating organohalosilanes. The method includes introducing a mixture including at least a first organohalosilane and a second organohalosilane onto a chromatographic bed including a stationary phase. The method also includes passing a liquid mobile phase through the chromatographic bed to produce an eluate including at least one fraction enriched in the first organohalosilane and at least one fraction enriched in the second organohalosilane.

Purification of chlorosilanes using chromatography

The application relates to a method for preparing organohalosilanes in a two-step process: Steps (i) contacting a copper catalyst with hydrogen gas and halogenated silanes forming a silicon-containing copper catalyst; and Step (ii) contacting said silicon-containing copper catalyst with an organohalide to form the organohalosilane.

Method of preparing an organohalosilane

A method of preparing organohalosilanes comprising combining an organohalide having the formula RX (I), wherein R is a hydrocarbyl group having 1 to 10 carbon atoms and X is fluoro, chloro, bromo, or iodo, with a contact mass comprising at least 2% (w/w) of a palladium suicide of the formula PdSi(II), wherein x is an integer from 1 to 5 and y is 1 to 8, or a platinum suicide of formula PtSi (III), wherein z is 1 or 2, in a reactor at a temperature from 250 to 700&#xb0; C. to form an organohalosilane.

A method of preparing a diorganodihalosilane, the method comprising the following separate and consecutive steps: (a) treating a metal catalyst comprising a metal selected from the groups consisting of i) gold, ii) gold and copper, iii) gold, copper and magnesium, iv) copper, rhodium and gold, v) copper, rhodium, and rhenium, vi) rhenium and palladium, vii) copper, and viii) copper and magnesium with a mixture comprising hydrogen gas and an organotrihalosilane at a temperature from 500 to 1400&#xb0; C. to form a silicon-containing metal intermediate; and (b) reacting the silicon-containing metal intermediate with an organohalide according to the formula RX, wherein R is C-Chydrocarbyl and X is halo, at a temperature from 100 to 600&#xb0; C. to form a diorganodihalosilane and a depleted silicon-containing metal intermediate.

Method for preparing a diorganodihalosilane

A mixture of at least two polyhedral oligomeric silsesquioxane (POSS) compounds is formed in the presence of rhenium on cerium(IV) oxide. The POSS compounds are formed utilizing a method that includes the step of combining (a) a trihalosilane, (b) hydrogen gas, and (c) the rhenium on cerium(IV) oxide, in a reactor at a temperature of from 250&#xb0; C. to 600&#xb0; C. to form the mixture. The trihalosilane has the formula RSiXwherein R is an alkyl group having from 1 to 4 carbon atoms, an aryl group, and wherein X is a halo atom. This method allows for the efficient, predictable, and accurate production of the POSS compounds with a minimized need for use of expensive separation techniques. In addition, this method produces the POSS compounds in commercially useful quantities as major reaction products thereby avoiding the need to run multiple reactions.

Method of forming polyhedral oligomeric silsesquioxane compounds

A method of preparing a diorganodihalosilane comprising the separate and consecutive steps of (i) contacting a copper catalyst with a mixture comprising hydrogen gas and a silicon tetrahalide at a temperature of from 500 to 1400&#xb0; C. to form a silicon-containing copper catalyst comprising at least 0.1% (w/w) of silicon, wherein the copper catalyst is selected from copper and a mixture comprising copper and at least one element selected from gold, magnesium, calcium, cesium, tin, and sulfur; and (ii) contacting the silicon-containing copper catalyst with an organohalide at a temperature of from 100 to 600&#xb0; C. to form at least one diorganodihalosilane.

A method of preparing a trihalosilane comprising the separate and consecutive steps of (i) contacting a copper catalyst with hydrogen gas and a silicon tetrahalide at a temperature of from 500 to 1400&#xb0; C. to form a silicon-containing copper catalyst comprising at least 0.1% (w/w) of silicon, wherein the copper catalyst comprises a metal selected from copper and a mixture comprising copper and at least one element selected from gold, magnesium, and platinum; and (ii) contacting the silicon-containing copper catalyst with a hydrogen halide at a temperature of from 100 to 600&#xb0; C. to form a trihalosilane.

Method for preparing a trihalosilane

A process for preparing organohalosilanes comprising combining hydrogen, a halosilane having the formula HSiX(I) and an organohalide having the formula RX (II), wherein R is C-Calkyl or C-Ccycloalkyl, each X is independently halo, and the subscript a is 0, 1, or 2, in the presence of a sufficient amount of a catalyst effective in enabling the replacement of one or more of the halo groups of the halosilane with the R group from the organohalide, at a temperature from 200 to 800&#xb0; C., to form an organohalosilane and a hydrogen halide, wherein the volumetric ratio of hydrogen to halosilane is from 1:3 to 1:0.001 and the volumetric ratio of hydrogen to organohalide is from 1:1 to 1:0.001, and wherein the catalyst is optionally treated with the hydrogen or the halosilane prior to the combining.

Preparation of organohalosilanes

A method of making a diorganodihalosilane contacting an organotrihalosilane according to the formula RSiX(I) with hydrogen in the presence of a metal catalyst comprising at least two metals and at a temperature from 300 to 800&#xb0; C. to form a diorganodihalosilane, wherein R is C-CQ hydrocarbyl, X is halo, and two of the at least two metals are chosen from at least one of (i) copper and palladium, (ii) copper and gold, (iii) indium and iridium or (iv) iridium and rhenium.

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Midland, MI, United States of America

Robert Thomas Larsen