METHOD OF PRODUCING SILICA GEL Russian patent published in 2016 - IPC C01B33/16 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of silica gel. Method involves mixing sodium silicate solution with aluminium sulphate solution to obtain a sol, which changes into gel. Mixing of solutions is performed at temperature not higher than 10 °C with concentration of sodium silicate 1.7-2.0 mol/dm³ and concentration of aluminium sulphate 0.45-0.48 mol/dm³. Obtained Sol is moulded into balls, which are held in circulating stream of sodium sulphate solution, said balls are washed, first with sulphuric acid, then with purified water or steam condensate. Drying is performed at temperature of 70 °C to 180 °C and calcining at 360-400 °C without access of water vapour. Obtained silica gel contains 96-97 % silicon dioxide and 3-4 % aluminium oxide.

EFFECT: invention provides higher operational characteristics of silica gel during extraction of petrol-containing components.

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