FIELD: technological processes.
SUBSTANCE: method of removing sulphur dioxide from a feed gas stream, comprising (I) contacting the feed gas stream with an aqueous lean absorbing medium comprising a chemical solvent comprising a regenerable absorbent, a physical solvent, and one or more heat stable salts. Regenerable absorbent is an amine. Ratio between the values, by wt%, for the physical solvent and regenerable absorbent is in the range from 0.5 to 2.5. Ratio between the values, by wt%, for the heat stable salts and regenerable absorbent is in the range from 0.29 to 0.37. Lean absorbent medium has pH of 6 or less. SO2 can be selectively removed using this method.
EFFECT: invention allows to reduce the energy consumption for regeneration of SO2 from a gas stream.
10 cl, 6 dwg, 12 tbl
