A method for eliminating acid gas consisting of co2 and/or h2s of gas mixtures. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the object of the main patent no. 365,057 by: "A method to remove acid gases consisting of CO2 and/or H2S from gas mixtures", by means of a cyclical procedure in which an aqueous alkaline washing solution is circulated between an absorption stage where said gaseous mixture is washed with said solution under a substantial superatmospheric pressure, and a regeneration stage where said solution is subjected to steam evolution under substantially reduced pressures in order to desorb the acid gas; characterized by the operations of removing from said absorption stage at least part of said washing solution in the form of a hot stream at a temperature higher than the atmospheric boiling temperature of the regenerated solution; establishing at least two separate regeneration zones, where the solution from said absorption stage is subjected to steam evolution in order to desorb the acid gas from it, under pressures substantially lower than the pressure in said absorption stage; maintain one of said regeneration zones as a zone of higher pressure and higher temperature, which works under super-atmospheric pressure; feeding said regeneration zone of higher pressure with solution from said absorption stage, at a temperature higher than the atmospheric boiling temperature of the regenerated solution; maintain another of said regeneration zones as a regeneration zone at lower pressure and lower temperature, fed with a separate stream of solution from said absorption stage; reducing the pressure on the regenerated solution leaving the regeneration zone with the highest pressure, thus generating steam by instantaneous vaporization and cooling said solution; feeding this steam as release steam to said lower pressure regeneration zone; and return to said absorption stage the regenerated solution streams, coming from said regeneration zones of higher pressure and lower pressure. (Machine-translation by Google Translate, not legally binding)