METHOD FOR REMOVING OFF GASES FROM SULFUR OXIDES WITH OBTAINING COMMERCIAL PRODUCTS Russian patent published in 2019 - IPC B01D53/14 

FIELD: technological processes.

SUBSTANCE: invention relates to methods of purifying exhaust gases (pyrolysis gas, flue gases from combustion thereof or other hydrocarbons) from sulfur oxides in heat engineering, metallurgy and other industries with similar composition of exhaust gases. Method of purification of waste gases from sulfur oxides comprises continuous contact in absorption scrubber with circulating water absorbent, which is removed with absorption products for neutralization. Water absorbent used is 20…25 % aqueous solution of dolomite dust in form of a suspension. Suspension is supplied by spraying into gas collector. Further, gases are cooled with t=700…800 °C to t=110…120 °C and then due to multiple action of sprayed suspension of gases in scrubber are cooled to temperature of 80…90 °C. Magnesium and calcium oxides of dolomite suspension react with sulfur oxides to form calcium and magnesium sulphates. Thereafter, sulfur-free gas is sucked from scrubber top and fed into gas holder. When the content of magnesium sulphate 42…45 %, it is removed from circulation and a reserve vessel with the same suspension is introduced. Suspension withdrawn from circulation is fed for three-stage treatment to obtain commercial products.

EFFECT: invention reduces cost of cleaning exhaust gases from sulfur oxides due to their binding with magnesium and calcium oxides of dolomite dust, as well as production of commercial products in process of purification (gypsum, bitter salt and their mixture).

1 cl, 1 dwg, 4 tbl