SORBENT FOR CLEANING WATER AND GROUND SURFACES FROM CRUDE OIL AND PETROLEUM PRODUCTS AND METHOD OF PREPARATION THEREOF Russian patent published in 2003 - IPC

FIELD: oil pollution elimination. SUBSTANCE: sorbent contains 70-85% steam- and UV-treated ground brown coal, 0.2-0.2% surfactant OP-7 and OP-4, and 3.0-20% silica powder. More particularly, brown coal is first subjected to primary grinding to fineness at least 1 mm and then treated anaerobically with overheated steam at 105-110 C under simultaneous UV radiation for 30 min, carbonized at 280-340 C until volatile components are completely released, reground to fineness 0.5-100 mcm while simultaneously adding silica powder and surfactants. EFFECT: enabled preparation of environmentally safe sorbent with high capacity and low loose density. 18 cl, 3 tbl, 2 ex