TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: Alcohol and liquid products of simultaneous oxidation and reduction reaction are mixed in a particular amount such that reacting mass compounds having silicon-hydrogen bonds are absent and the active portion of the catalyst is recycled as a reactant in the simultaneous oxidation and reduction reaction. The alcohol obtained by hydrolysis of tetra-alkoxysilane is dehydrated using tetra-alkoxysilane extract of the liquid products which is then completely hydrolyzed. Purification of silane is by absorption in a counter current flow, for approximately 5-60 minutes, at a temperature near the freezing point of absorption medium. The difference in silane and absorber temperature is less than 5 degreesC and the silane purification absorbent is the tetra-alkoxysilane liquid product extract. EXAMPLE - Powdered metallurgic silicon (98.2% silicon) was mixed with copper chloride (5% of silicon weight) and was dispersed in dodecaethoxypentasiloxane followed by reaction with dried ethanol (after adding aluminum) at 200 degreesC. Vapors of ethoxysilane and unreacted ethanol were condensed. Ethanol was reused with silicon. The mixture of ethoxysilane (having 87 wt.% of triethoxy silane) was purified by bubbling ammonia gas and was subjected to simultaneous oxidation and reduction in presence of catalyst (1% solution of sodium trialkoxysilanolate in triethoxysilane) at 20 degreesC for 20 hours. Silane released was purified by absorption. Tetraethoxysilane used as absorber was cooled and then temperature was increased from -80 to 20 degreesC while that of silane was decreased from 20 to -80 degreesC. After complete absorption, concentration of organo elemental impurities was less than 0.001 volume percent. Adsorption was then performed on activated carbon and silane was produced. Liquid products of oxidation and reduction reaction were mixed with ethanol (0.85% of liquid product weight) to break-up the remaining silicon-hydrogen bonds in unreacted ethoxysilanes. Tetraalkoxysilane was then separated and the catalyst was reused in simultaneous oxidation and reduction reaction. Tetra-alkoxysilane (with 0.43% alcohol) obtained was passed through absorption column to dehydrate the alcohol. Then the partially hydrolyzed tetra-alkoxysilane was completely hydrolyzed to obtain silica sol and ethanol, which was returned to reaction with silicon. Quantity of alcohol returned was 96% of that used initially.