Patent ID: 8476468

Claim:
A process for purifying a silicon compound, comprising: contacting an anhydrous silicon compound comprising at least one metal impurity with a dried adsorbent effective for retention of the metal impurity to adsorb the impurity on the adsorbent; removing the adsorbent with the adsorbed impurity from the anhydrous silicon compound to obtain an adsorbent-free anhydrous silicon compound having a reduced content of the impurity; and filtering the silicon compound having a reduced content of the impurity through at least one filter having a pore size of 1 μm or less to obtain an ultra-high purity silicon compound; wherein the silicon compound is an organosilane of formula I, an oligomeric or polymeric organosiloxane which is obtained from at least partial hydrolysis and condensation of at least one organosilane of formula I, or an inorganic silane of formula IV R 1 a R 2 b R 3 c Si(OR 4 ) (4−a−b−c) (I), wherein 0≦a≦3, 0≦b≦3, 0≦c≦3, a+b+c≦3, R 1 is independently hydrogen, a linear, branched, or cyclic, optionally substituted, alkyl group having 1 to 18 carbon atoms, a linear, branched, or cyclic alkoxy, alkoxyalkyl, aryloxyalkyl, arylalkyl, aminoalkyl, haloalkyl, polyether, polyetheralkyl, alkenyl, alkynyl, epoxyalkyl, ureidoalkyl, mercaptoalkyl, cyanoalkyl, isocyanatoalkyl, methacryloyloxyalkyl, or acryloyloxyalkyl group having 1 to 18 carbon atoms or an aryl group having 6 to 12 carbon atoms, R 2 is independently hydrogen, a linear, branched, or cyclic alkyl group having 1 to 18 carbon atoms or an aryl group having 6 to 12 carbon atoms, R 3 is independently hydrogen, a linear, branched, or cyclic alkyl group having 1 to 18 carbon atoms or an aryl group having 6 to 12 carbon atoms, and R 4 is independently a linear, branched, or cyclic alkyl or alkoxyalkyl group having 1 to 8 carbon atoms; Si n H d R 5 e X ((2n+2)−d−e) (IV), wherein 1≦n≦5, 0≦d≦12, 0≦e≦12; each X is independently a halogen, and each R 5 group in the silane is independently a linear, branched, or cyclic alkyl group having 1 to 16 carbon atoms, an aryl group, or an alkylaryl group, the metal impurity is at least one metal or compound of the metal selected from the group consisting of boron, aluminum, copper, and iron, and a content of each metal impurity in the ultra high-purity silicon compound is from 0 μg/kg to 5 μg/kg.