NOVELTY - A method for deacidifying gaseous effluent containing acidic compound(s) (I) involves: (a) contacting with reactant(s) (II) in liquid form to give gas depleted in (I) and a liquid fraction containing (I)/(II) reaction products and unreacted (II); (b) contacting the liquid with extractant (III) to give fractions depleted and enriched in the products; (c) recycling the depleted fraction to step (a); and (d) regenerating the enriched fraction to release gaseous (I) and give (II)/(III) mixture.    USE - The gaseous effluent to be deacidified typically consists of natural gas, synthesis gas, combustion fumes (e.g. from oil- or coal-fired power stations), refinery gas, Claus process tail gas, biomass fermentation gas, cemetry gas or blast furnace gas.    ADVANTAGE - The amount of energy required to regenerate the absorbent solution after loading with (I) is minimized.    DETAILED DESCRIPTION - A method for deacidifying waste gas containing acidic compound(s) (I) selected from hydrogen sulfide, mercaptans, carbon dioxide, carbon oxysulfide, sulfur dioxide and/or carbon disulfide involves: (a) contacting with reactant(s) (II) in liquid form to give an effluent gas depleted in (I) and a first liquid fraction containing (I)/(II) reaction products and unreacted (II); (b) contacting the liquid fraction with extractant (III) to give first and second liquid fractions depleted and enriched respectively in the reaction products; (c) recycling the first fraction from step (b) to step (a), as at least part of the treatment liquid; and (d) regenerating the second fraction from step (b) to release (I) in gaseous form and obtain a mixture of (II) and (III).    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of one form of the process.    Gaseous effluent supply line (1)    Acid-depleted gas outlet line (2)    Acid-loaded absorbent outlet line (3)    Reaction product transfer line (4)    Reaction product outlet line (5)    Expanded gas transfer line (6)    Reaction product-loaded extractant outlet line (7)    Regenerated reactant outlet line (8)    Coabsorbed product-enriched gaseous stream outlet line (9)    Extractant transfer line (10)    Regenerated absorbent and extractant outlet line (11)    Released gas outlet line (12)    Transfer line to heat exchanger (13)    Outlet line from heat exchanger (14)    Extraction solution supply lines (15, 16)    Absorbent recycling line (17)    Absorbent supplementation line (18)    Extractant supplementation line (19)    Liquid absorption solution supply line (20)    Separating flasks (BS1, BS2)    Heat exchangers (E1, E2)    Pumps (P1, P2)    Regeneration column (RE)    Expansion valve (V1)    Absorption zone (ZA)    Extraction zone (ZE)