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    • 5. 发明专利
    • JP2559267B2
    • 1996-12-04
    • JP50410788
    • 1988-05-10
    • ERUFU AKITEENU
    • BURAN KUROODOPARADOSUKI ANRI
    • B01D53/44B01D53/48B01D53/77C07C7/11C10L3/10F25J3/02
    • PCT No. PCT/FR88/00227 Sec. 371 Date Feb. 21, 1989 Sec. 102(e) Date Feb. 21, 1989 PCT Filed May 10, 1988 PCT Pub. No. WO88/08833 PCT Pub. Date Nov. 17, 1988.A cryogenic process of simultaneous selective desulphurization and gasoline removal of a gaseous mixture consisting mainly of methane and likewise containing H2S and hydrocarbons with C2 and more. Said gaseous mixture (1), after having eventually undergone an operation of removal of benzol (25) and then cooling (2) producing condensates (4), is washed between 0 DEG C. and -45 DEG C. by means of a solvent (5) selective of H2S to produce a current of methane (64) having a partial pressure in H2S below 65 Pa and a liquid phase (9a) rich in H2S and containing at least 80% molar of the hydrocarbons of C3 and more of the gaseous mixture (1). The liquid phase (9a) is subjected to a demethanization (29, 9) producing a demethanized rich solvent (11) and a gaseous phase rich in methane (10), the solvent (11) then is cooled between -25 DEG and -80 DEG C. sufficiently to produce its dissociation in a lower liquid fraction (38) that contains the H2S and, in methane equivalent, less than 5% molar of hydrocarbons and an upper liquid fraction (37) formed of the hydrocarbons of C3 and more. Said fractions (37, 38)are separated and the fraction (38) undergoes a regeneration (46, 16, 20) to produce a current (24) of acid gas rich in H2S and containing the small amount cited above of hydrocarbons and a regenerated solvent (21).