Method for gas deacidification in order to produce concentrated acid gases

摘要

Process for treating a gas contg. hydrocarbon(s) and acid gas(es) to remove at least part of the acid gas and to produce at least one conc. acid gas, with the following stages comprises: (a) cooling the gas to ambient temp. or below and contacting with a first solvent mixt. contg. polar solvent(s) and water, to produce a first solvent fraction rich in acid gases and contg. dissolved hydrocarbons, and a gaseous fraction low in acid gases; (b) regenerating the first solvent fraction, rich in acid gases, by lowering the pressure and/or raising the temp. to produce a gaseous fraction contg. hydrocarbons and a solvent phase low in acid gases, which is recycled to stage (a); (c) contacting the fraction rich in acid gases with a second solvent mixt. contg. polar solvent(s) and water to produce a gaseous fraction rich in hydrocarbons and a second solvent fraction rich in acid gases; (d) regenerating this second fraction rich in acid gases as in stage (b) to produce a gaseous fraction more concd. in acid gases than that from phase (b) and recycling the solvent phase to stage (c).