METHOD OF PREPARING AMORPHOUS MICRO/MESOPOROUS ALUMOSILICATE GEL Russian patent published in 2000 - IPC

FIELD: chemical industry. SUBSTANCE: amorphous micro/mesoporous alumosilicate gel with controllable pore size having surface area of at least 500 sq. m and SiO₂:Al₂O₃ molar ratio of at least 30:1 is obtained from tetra-((C₂-C₅)) alkylammonium hydroxide, tri-((C₂-C₄)) aluminium alkoxide and tetra-((C₁-C₅)) alkylorthosilicate. They are subjected to hydrolysis and gel formation by treatment at atmospheric pressure and at temperature equal or higher then boiling temperature with any alcohols which are formed as by-product in hydrolysis reaction without removal of alcohols from reaction medium, the resulting gel is dried and calcined. Alumosilicate gel thus formed has composition which corresponds to that of initial reactants provided that reaction yield is substantially quantitative. SiO₂:Al₂O₃ molar ratio is in the range from 30:1 to 500:1 and preferably from 50:1 to 300:1, most preferably 100:1. This gel proves to be amorphous, has surface area of at least 500 sq.m/g and is active hydrocarbon conversion catalyst, especially during oligomerization of propylene. EFFECT: more efficient preparation method. 9 cl, 5 dwg, 7 ex