Patent ID: 7825243

Claim:
A continuous process for the concurrent production of isocyanantosilane in a cracking reaction zone and silylisocyanurate in a trimerization zone, which comprises: a) continuously providing a silylorganocarbamate of the general formula; R a 1 SiX (3-a) RNHCOOR 2 , wherein R is a divalent hydrocarbon group of from 2 to 11 carbon atoms; R 1 is an alkyl or halogenated alkyl group of from 1 to 8 carbon atoms, an aryl group of at least 6 carbon atoms or an aralkyl group of at least 7 carbon atoms; R 2 is an alkyl group having 1 to 8 carbon atoms; X is a hydrolysable alkoxy group; and a is an integer from 0 to 3 to a cracking reaction medium comprising silylorganocarbamate, in the absence or, optionally, in the presence of a catalytically effective amount of cracking catalyst selected from the group consisting of ammonium carboxylate, alkali metal carboxylate and alkaline earth metal carboxylate, in a cracking reaction zone; b) subjecting the cracking reaction medium in the cracking reaction zone to cracking reaction conditions to provide isocyanatosilane of general formula: R a 1 SiX (3-a) RNCO, wherein R is a divalent hydrocarbon group of 2 to 11 carbon atoms, R 1 is an alkyl or halogenated alkyl group of from 1 to 8 carbon atoms, an aryl group of at least 6 carbon atoms or an aralkyl group of at least 7 carbon atoms; X is a hydrolysable alkoxy group; and a is an integer from 0 to 3, and by-product alkanol of general formula: R 2 OH wherein R 2 is an alkyl group having 1 to 8 carbon atoms; c) recovering isocyanatosilane and by-product alkanol from the cracking reaction zone; d) purging continuously a portion of the cracking reaction medium during the cracking reaction; e) introducing purged cracking reaction medium to a trimerization reaction zone; and, f) subjecting the purged cracking reaction medium in the trimerization reaction zone to trimerization reaction conditions to provide silyisocyanurate of general formula; wherein R is a divalent hydrocarbon group of from 2 to 11 carbon atoms; R 1 is an alkyl or halogenated alkyl group of from 1 to 8 carbon atoms, an aryl group of at least 6 carbon atoms or an aralkyl group of at least 7 carbon atoms; X is a hydrolysable alkoxy group; and a is an integer from 0 to 3 and by-product alkanol of general formula: R 2 OH wherein R 2 is an alkyl group having 1 to 8 carbon atoms.