Abstract: A redistribution process for enriching a low-boiling methylsilane mixture in a methylchlorosilane selected from a group consisting of dimethylhydrochlorosilane and trimethylchlorosilane. The process comprises contacting a low-boiling methylsilane mixture, resulting from the contact of methyl chloride with silicon, with alumina under non-equilibrium conditions at a temperature greater than about 150.degree. C. The present inventors have discovered that the concentrations of dimethylhydrochlorosilane and trimethylchlorosilane reach maximum levels under non-equilibrium conditions occurring at a temperature greater than about 150.degree. C. The process is also useful for facilitating the removal of olefin and chlorocarbon organic contaminants from the low-boiling methylsilane mixture.

Abstract: The present invention is a method for reducing the ionic chloride content of hydroxyl-terminated siloxanes. The method involves contacting the hydroxyl-terminated siloxanes with a molecular sieve effective in removing residual water from the siloxanes. Since ionic chloride strongly partitions into the water phase, ionic chloride is removed along with the water phase. In a preferred embodiment of the present method as aprotic solvent is employed to facilitate water removal from the hydroxyl-terminated siloxanes.

Abstract: The present invention relates to a novel method of preparing alkoxysilanes and oligomeric alkoxysiloxanes. The method comprises reacting a metal silicate with an acid selected from the group consisting of sulfurous acid and acids with a pKa greater than about 2.5 in the presence of an alcohol. The resultant product is then reacted with an alcohol to form the alkoxysilane or oligomeric alkoxysiloxane, depending on the starting silicate. This method is particularly valuable since the reaction conditions are mild and the reactants are readily available.

Abstract: The instant invention is a method for the quenching of a spent bed resulting from the reaction of organic halides with silicon metal to form organohalosilanes. The method employs a strong base and elevated temperature to digest the hydrophobic siloxane-rich coating and dislodge the carbon coating which forms around the spent bed particles. Removal of these coatings allows more rapid and complete quenching of the autoxidants on the surface of the spent bed particles.

Abstract: The described invention is a process for reducing residual organic chlorides in a crude phenylchlorosilane mixture. The process involves contacting the organic chloride with a Lewis acid forming material, in the presence of a phenyl source. The phenyl source can be the phenylchlorosilanes and other sources of phenyl present in the crude phenylchlorosilane mixture. The organic portion of the organic chloride forms a hydrocarbon adduct with the phenyl source. If desired, the hydrocarbon adduct can be easily separated from the phenylchlorosilanes.

Abstract: Preceramic polymers composed of [R.sub.2 SiC.tbd.CSiR.sub.2 ] and, optionally, [R.sub.2 Si] units are described where R is hydrogen, an alkyl radicals containing 1 to 8 carbon atoms, phenyl radicals, or vinyl radicals. These preceramic polymers may be converted into silicon carbide-containing ceramic materials by pyrolysis at elevated temperatures.

Abstract: A process for reducing the chlorocarbon content of alkylsilanes is described. The process comprises (A) contacting crude alkylsilanes, containing as a minor portion chlorocarbons, and a hydrogen-containing silane with a catalyst; wherein the catalyst is a sufficient amount of an effective Lewis acid forming material; (B) facilitating the reaction of the chlorocarbons with the hydrogen-containing silane in contact with the catalyst to convert the chlorocarbons to a linear or branched alkanes; (C) separating catalyst from the alkylsilanes and alkanes; and (D) recovering alkylsilanes with lowered chlorocarbon content.

Abstract: A process for purifying alkylhalosilanes to reduce the content of olefinic impurities is described. The process comprises (A) contacting crude alkylhalosilanes, containing as a minor portion the olefinic impurities, with a hydrogen-containing halosilane and a soluble compound of a Group VIII metal; (B) facilitating reaction of the olefins with the hydrogen-containing silicon compound in contact with the Group VIII metal compound to form linear or branched silalkanes, said silalkanes having the formula,R.sup.ii.sub.m A.sub.n SiX.sub.p ; and(C) separating the alkylhalosilanes from the silalkanes formed in the reaction in (B).

Abstract: This invention relates to a process for the preparation of polysiloxanes by reacting halosilanes in the presence of metal oxides and sulfolane. Preferred metal oxides include antimony (III) oxide, antimony (V) oxide, cadmium oxide, calcium oxide, copper (II) oxide, indium oxide, iron (II) oxide, iron (III) oxide, magnesium oxide, manganese (II) oxide, mercury (II) oxide, nickel (II) oxide, thallium (III) oxide, tin (II) oxide, and zinc oxide. Improved yields and rates of reaction can be observed with the process of this invention.

Abstract: A process is described by which numerous waste or by-product chlorosilane streams can be treated to obtain a granular gel that is easily handleable in further processing steps, shipment, or disposal operations. By hydrolyzing a combined stream with an average SiCl functionality greater than or equal to 2.8 in an aqueous medium at elevated temperature a granular gel is obtained in all cases. The combined stream can be formed by blending several different streams to obtain the desired average SiCl functionality. If the aqueous medium is concentrated hydrogen chloride, the hydrogen chloride generated in the hydrolysis step can be recovered.

Abstract: This invention relates to a method of separating close-boiling chlorosilanes from mixtures by employing the technique of liquid extraction with sulfolane and a hydrocarbon compound as co-solvents. The hydrocarbon compound employed is substantially immiscible in sulfolane and is present in sufficient amounts so that two liquid phases are formed, one being suloflane-rich and the other being hydrocarbon-rich. The mixture of chlorosilanes is intimately mixed with the two solvents and allowed to partition between the two phases. The preferred liquid extraction procedure is where the sulfolane and hydrocarbon solvent are in a countercurrent relationship within an extraction tower. Experimentally determined selectivity coefficients show that mixtures of (1) dimethyldichlorosilane and methyltrichlorosilane, (2) phenylmethyldichlorosilane and phenyltrichlorosilane, and (3) trimethylchlorosilane and tetrachlorosilane can be successfully separated by the techniques of this invention.

Abstract: Compounds useful as crosslinkers and having the formula: ##STR1## wherein R is selected from the group consisting of alkyl having 1 to 4 carbon atoms, trifluoromethyl and phenyl and x is an integer of 2 to 4, can be used to cure polyorganosiloxanes.

Abstract: Compounds useful as crosslinkers and having the formula: ##STR1## wherein R is selected from the group consisting of alkyl having 1 to 4 carbon atoms, trifluoromethyl and phenyl and x is an integer of 2 to 4, can be used to cure polyorganosiloxanes.

Abstract: Organosiloxane fluids containing polyfunctional silicon atoms are made by reacting a mixture of chlorosilanes containing a silane or disilane having at least 3 chlorine atoms with methanol in contact with certain quaternary ammonium halide catalysts. For example a fluid methylpolysiloxane was obtained by reacting a mixture of 30 weight percent methyltrichlorosilane and 70 weight percent dimethyldichlorosilane with methanol in contact with methyl pyridinium chloride.

Abstract: Compositions comprising certain acrylate-containing polyorganosiloxanes and a hydroperoxy polymerization initiator are anaerobically curing sealant compositions. For example, a composition comprising a polyorganosiloxane consisting essentially of 42 mole percent trimethylsiloxane units and 58 mole percent methacryloxypropyl silsesquioxane units and cumene hydroperoxide remained uncured for several days in the presence of oxygen but cured to a solid, insoluble sealant when placed on the threads of an iron bolt and a nut was threaded onto the bolt.

Abstract: Organopolysiloxane compositions suitable for use in a liquid injection molding process of elastomeric articles are produced by mixing a vinyl-endblocked polydiorganosiloxane fluid copolymer containing dimethylsiloxane units and methyl-3,3,3-trifluoropropylsiloxane units, a treated, reinforcing silica filler, a platinum-containing catalyst, a curing agent comprising dimethylhydrogensiloxane units as the only source of silicon-bonded hydrogen atoms and, as an inhibitor for the platinum-containing catalyst, certain olefinic siloxanes and/or acetylenic siloxanes. These compositions are especially suited for liquid injection molding because they can be stored at room temperature for days and can be injected into a hot mold with pressures less than 352 kg./sq.cm. (5,000 psi) whereon they cure rapidly to an elastomeric article having a tensile strength greater than 42 kg./sq.cm., and elongation at break greater than 300 percent and a tear strength greater than 7 kg./cm.

Abstract: Olefinic siloxanes which are inhibitors for platinum catalyst can be made by the reaction of secondary or tertiary acetylenic alcohols with siloxanes having silicon-bonded-hydrogen atoms. These olefinic siloxanes inhibit the platinum catalyst such that it will not catalyze the addition of SiH to aliphatic unsaturation at room temperature and does not inhibit the reaction at elevated temperatures. These olefinic siloxanes contain from 3 to 10 siloxane units with a total of at least three units from at least one RHSiO and/or R.sub.2 HSiO.sub.0..sub.5, at least one ##EQU1## and the remaining siloxane units being ##EQU2##R.sub.3 SiO.sub.0..sub.5, SiO.sub.2 or RSiO.sub.1..sub.5but no more than three units of any one of these siloxane units.

Abstract: Injecting a mixture of an acetylenic alcohol and a siloxane compound having at least three silicon-bonded hydrogen atoms into a gas liquid chromatographic (GLC) column through an injection port heated at 300.degree.C. to 375.degree.C. and coated with a layer of a platinum catalyst where the column is heated at 100.degree.C. to 375.degree.C. provides an olefinic siloxane compound which is, below 100.degree.C., an inhibitor for the reaction between the acetylenic alcohol and the siloxane compound having at least three silicon-bonded hydrogen atoms in the presence of a platinum catalyst. This method provides high purity products which do not need further distillation and which do not contain platinum.BACKGROUND OF THE INVENTION1. Field of the InventionThis invention relates to a method of preparing a siloxane compound having olefinic unsaturation by using a GLC column.2. Description of the Prior ArtThe reaction between compounds having aliphatically unsaturated carbon linkages such as C=C or C.tbd.