METHOD OF PRODUCTION OF HYDROPHOBIC SILICA Russian patent published in 2007 - IPC C01B33/18 C09C3/10 

FIELD: organic and physical chemistry; chemical modification of solid surfaces of highly dispersed amorphous silica for imparting hydrophobic properties; oil and gas industry; manufacture of building materials.

SUBSTANCE: proposed method consists in production of silica by chemical modification of surface with the aid of organic compounds at elevated temperature. Modification reaction is conducted in reactor at mechanical mixing and at boiling point of modifying agent. Modification of surface is performed with the aid of compound selected from group of higher α-olefins C₁₀-C₁₆ at elevated temperature; the procedure is continued for 3-10 h at the following ratio of mixture components, mass-%: α-olefin : dispersed silica (17-95) : (5-83), respectively. Proposed method may additionally include drying or dehydroxylation of silica at temperature of 120-300°C for 2 h.

EFFECT: avoidance of corrosion of equipment; enhanced ecological safety; low cost of final product.

2 cl, 1 tbl, 12 ex