| 초록 |
The synthesis of tetraalkoxysilane, especially tetraethoxysilane (TEOS) which is commonly used as the precursor of silica in industrial field, has been studied. The yield of TEOS was optimized by varying reaction conditions such as the mole ratio of Si metal to alcohols, reaction temperature and time in the presence of an alkali metal catalyst. In this study, diethylene glycol monoalkyl ether solvents were used as reactant and solvent. For the production of TEOS, the mole ratio of alkali metal to ether solvent was used in the range of 0.6~0.9 : 1. The reaction was carried out by feeding ethanol at temperature of 160 ~ 190℃ and afforded TEOS as major product. Hydrogen gas was formed as the reaction occurred. Except for TEOS as main product, the little amount of other alkoxysilane byproducts were obtained from the transalkoxylation reaction with alcohols such as butyl triethyl silicate, 2-ethoxy triethyl silicate, etc. formed from the decomposition of diethylene glycol ether solvents. |
