摘要:
The instant invention is a catalyzed process for the redistribution of linear, chloride or hydroxy end-terminated polyorganosiloxanes or cyclic polyorganosiloxanes. Effective catalysts for the described process are alumina, silica-alumina, activated carbon, zeolite and acid clay. The catalyzed redistribution process can be incorporated as an element of a three-stage process. The three-stage process allows control of the yield of cyclic polyorganosiloxanes.
摘要:
A process for converting a high-boiling fraction, resulting from the reaction of methyl chloride with silicon metalloid in a process typically referred to as the "direct process", to monosilanes. Said process comprises forming a mixture comprising a low-boiling fraction comprising monosilanes and a high-boiling fraction comprising polymeric silicon containing compounds and contacting the mixture with hydrogen gas in the presence of a catalyst effective in promoting conversion of the polymeric silicon containing compounds to monosilanes. The process results in conversion of the high-boiling fraction to monosilanes. At least a portion of the catalyst present may be formed in situ during conduct of the direct process and isolation of the fractions.
摘要:
A process for converting a high-boiling fraction, resulting from the reaction of methyl chloride with silicon metalloid in a process typically referred to as the "direct process", to monosilanes. Said process comprises forming a mixture comprising a low-boiling fraction comprising monosilanes and a high-boiling fraction comprising polymeric silicon containing compounds and contacting the mixture with hydrogen gas in the presence of a catalyst effective in promoting conversion of the polymeric silicon containing compounds to monosilanes. The process results in conversion of the high-boiling fraction to monosilanes. At least a portion of the catalyst present may be formed in situ during conduct of the direct process and isolation of the fractions.
摘要:
A hydrochlorination process is claimed herein for production of monosilanes from the high-boiling residue obtainable from the reaction of organochlorides with silicon in a process known as the "direct process". Our process comprises (A) forming a mixture of said high-boiling residue and an organosilane and (B) contacting said mixture with hydrogen chloride in the presence of a catalytic amount of a catalyst composition effective in the formation of monosilanes from said high-boiling residue. A preferred catalyst composition comprises aluminum trichloride, at least a portion of which may be formed, in situ , during conduct of the direct process and isolation of said high-boiling residue.
摘要:
A process is claimed for the use of water granulated silicon in the manufacture of alkylhalosilanes. In said process, an alkyl halide, described by formula RX, is contacted with a water granulated silicon particulate containing greater than 0.5 to 5.0 weight percent iron and greater than 0.05 to 0.3 weight percent titanium, in the presence of a catalyst composition comprising copper and at a temperature of 250 to 350°C., wherein R is selected from alkyls having one to four carbon atoms and X is a halogen atom.