Synthesis of Tetramethoxysilane from SiO2-Containing Industrial Wastes
O. V. PERERVA1,2, M. V. DMITRIEVA1, P. A. STOROZHENKO1
1State Research Institute of Chemistry and Technology of Organoelement Compounds, Moscow, Russia
2Mendeleev University of Chemical Technology of Russia, Moscow, Russia
Keywords: tetramethoxysilane, silicon dioxide, dimethyl carbonate, chlorine-free technology, industrial waste recycling
Pages: 433-443
Abstract
The published data are considered, and the technological aspects of a promising industrial process for the chlorine-free production of alkoxysilanes from silicon dioxide are analysed. Particular attention is paid to key issues that have not yet been considered in the literature. It is shown that the raw material base for the synthesis of alkoxysilanes can be expanded at the expense of microsilica, waste from the production of silicon and ferrosilicon. It has been experimentally confirmed that potassium hydroxide used as a catalyst for the synthesis of alkoxysilanes can be recovered and returned to the process. It has been established that the products of tetramethoxysilane (Si(OMe)4) synthesis from silicon dioxide and dimethyl carbonate contain 55 components (among them, 45 high-boiling ones have not been identified). The main impurities in the reaction products are MeOH, CH2O, MeOMe, and (MeO)3SiOSi(OMe)3. Technological prospects for the process of obtaining Si(OMe)4 from industrial wastes are considered.
DOI: 10.15372/CSD2023488
EDN: GCPVQW
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