METHOD OF TETRAETHOXYSILANE PURIFICATION Russian patent published in 2014 - IPC C07F7/04 C07F7/20 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of purification of alkoxysilanes and deals with obtaining highly pure tetraethoxysilane. Claimed is a method of tetraethoxysilane purification, including the initial processing of a product to be purified with a 0.3-1.5% water ammonia solution, added with intensive mixing to tetraethoxysilane which must be purified in a volume ratio (4-6):1, further rectification of the preliminarily purified product and its purification by distillation without boiling at a rate of evaporation from the surface of 0.5-1.5 ml/cm²·hour. The technical result consists in the following: the method makes it possible to obtain a highly pure product with the content of limited metal admixtures at the level of 10^-6 wt %, chlorine less than 10^-3 wt % and suspended particles with the diameter of 0.3 mcm about 200 particles/cm³.

EFFECT: indices of the obtained tetraethoxysilane quality satisfy the requirements for initial products for highly technological materials.

3 cl, 1 tbl, 4 ex