METHOD AND APPARATUS FOR CONCENTRATING HUMIN ACID SALT SOLUTIONS Russian patent published in 2002 - IPC

FIELD: chemical engineering. SUBSTANCE: concentration of solutions is accomplished by formation of liquid film on the outside surface of hollow drum, which is then concentrated when being heated by a heat carrier until concentration of humin acids at least 21%. Each concentrated layer is removed from drum, packaged hot, and then cooled to ambient temperature. Apparatus has casing, hollow rotary drum with electric drive disposed at the level of casing edge and oriented along horizontal axis, housing- protected hot fan for supplying heat carrier onto outside drum surface, and also casing-mounted liquid layer-removal device. EFFECT: enabled formation of humin acid salts in the form of high-concentration gel, which is advantageous for storage and transportation. 2 cl, 1 dwg, 1 tbl, 4 ex