PROCESS AND APPARATUS FOR REDUCING THE CONCENTRATION OF A SOUR SPECIES IN A SOUR GAS

摘要

A process and apparatus for reducing a concentration of sour species in a gas to a predetermined residual concentration is provided. The process involves cooling the sour gas in a manner to produce a mixture of solid and/or liquid sour species and a vapour containing gaseous hydrocarbons and a residual amount of sour species. A cooled gas is separated from the mixture. The residual concentration of sour species in the cooled gas is then determined. When the residual concentration of sour species in the cooled gas is above the predetermined concentration, the cooled gas is compressed and the preceding process is repeated until the residual concentration of sour species in the cooled gas is at or below the desired concentration.