Fremgangsmåte og anordning for fjerning av minst en sur gass fra naturgass ved hjelp av et lösemiddel

摘要

The process comprises an absorption stage 2 of the natural gas in the cold by a solvent phase, under a pressure p2, which delivers a purified gas 5, a step of expansion and the separation of a solvent phase acid containing hydrocarbons (lines 4, 11) under a pressure p12 lower than the pressure p2 in a column - heat exchanger 12 which delivers a gaseous effluent to be removed from the bottom 13 and a solvent phase (line 17) enriched with hydrogen sulphide, and a step for regeneration of the solvent phase in a distillation column 18 under a pressure p18 at most equal to the pressure p12 . It is recovered from the column 18 a gas 29 containing mainly hydrogen sulphide, devoid of hydrocarbons, which is compatible with the load of a claus unit of elimination of h2 s. the hot regenerated solvent phase 20 of the heat exchange indirectly with the solvent phase acid and the cold air coming from the absorber 2 or of the separator 6. It is then recycled into the absorbent, after having been cooled. & br / application to the elimination of acid gases of a natural gas.