(US4935043-A)      Removing S contg. cpds. and recovering at least 3C hydrocarbons from a gaseous mixt. comprising CH4, at least 2C hydrocarbons and acid gas cpds. contg. H25, comprises, (a) contacting the gaseous mixt. at an absolute pressure above 0.5 MPa and low temp. with an amt. of solvent, to give a gas contg. CH4, a partial pressure of H25 of upto 65 Pa, a rich solvent comprising H25 and at least 80 mol.% at least 3C hydrocarbons in the gaseous mixt. (6) demethanising the rich solvent to give demethanised rich solvent and CH4 rich gas, (c) cooling the demethanised rich solvent to separate it into a purified rich solvent contg. acid gas cpds. and an amt. of hydrocarbon (expressed as CH4 equivalent), less than 5 mol.% acid gas cpds. and a prim. fraction comprising the hydrocarbons which were present in the demethanised rich solvent but not present in the purified rich solvent, (d) sepg. the purified rich solvent from the prim. fraction, (e) regenerating the purified rich solvent to produce H25 (expressed on a CH4 equivalent basis), less than 5 mol.% hydrocarbon based on the acid gas and regenerated solvent and (f) recycling the regenerated solvent as the solvent for contacting the gaseous mixt. The solvent used in (a) has a b.pt. at atmospheric pressure above 40 deg.C. and a viscosity at -40 deg.C. of less than 0.1 Pa.S.    ADVANTAGE -   Process is effected more easily and cheaply. (18pp)    (SU1745119-A3)      Removal of S cpds. and C2+ hydrocarbons from CH4-rich gas contg. H2S, C2+ hydrocarbons and opt. inert gases, H2), CO2, COS and/or mercaptans, where the gas is at an absolute pressure above 0.5 MPa, is effected by: scrubbing the gas at low temp., with a solvent that preferentially dissolves the H2S, COS and mercaptans and only part of the CO2, where the solvent has a b.pt. above 40 deg.C at atmospheric pressure and viscosity below 0.1 Pa.s at -40 deg.C to give a treated gas with an H2S partial pressure below 65 Pa or a total partial pressure of S cpds., below 26 Pa, and a rich solvent contg. H2S other absorbed components and at least 80 mole.% of the C3+ hydrocarbons present in the raw gas; (b) demethanising the rich solvent; (c) cooling the rich solvent to a temp. low enough to form a lower rich solvent phase contg. acids (H2S and opt. CO2, COS and mercaptans), with a hydrocarbon content which is less than 5 mole.% of the acid content, calcd. as CH4 equiv. and an upper hydrocarbon base; (d) sepg. the bases formed in (c); (e) regenerating the rich solvent to form an acid gas stream with a hydrocarbon content below 5 mole.% and a regenerated solvent; and (f) recycling the solvent to the scrubber.    USE -   The process is esp. applicable to natural gas. Bul.24/30.6.92    (JP2559267-B2)      Removal of S cpds. and C2+ hydrocarbons from a CH4-rich gas contg. H2S, C2+ hydrocarbons and opt. inert gases, H2O, CO2, COS and/or mercaptans, where the gas is at an absolute pressure above 0.5 MPa, is effected by: scrubbing the gas at low temp. with a solvent that preferentially dissolves the H2S, COS and mercaptans and only part of the CO2, where the solvent has a b.pt. above 40 deg.C at atmospheric pressure and a viscosity below 0.1 Pa.se. at -40 deg.C, to give a treated gas with an H2S partial pressure below 65 Pa or a total partial pressure of S cpds. below 26 Pa, and a rich solvent contg. H2S other absorbed components and at least 80 mole.% of the C3+ hydrocarbons present in the raw gas; (b) demethanising the rich solvent; (c) cooling the rich solvent to a temp. low enough to form a lower rich solvent phase contg. acids (H2S and opt. CO2, COS and mercaptans), with a hydrocarbon content which is less than 5 mole.% of the acid content, calcd. as CH4 equiv., and an upper hydrocarbon hase; (d) seg. the hases formed in (c); (e) regeneraing the rich solvent to form an acid gas stream with a hydrocarbon content below 5 mole.% and a regenerated solvent; and (f) recycling the solvent to the scrubber.    USE -   The process is esp. applicable to natural gas.