Process for recovery of sulfur values from a gas stream

摘要

The invention is a process wherein SO2 is absorbed in a concentrated solution of potassium citrate and the solution is reacted with H2S at a temperature above the melting point of sulfur to form elemental sulfur. The reaction produces a solution lean in sulfur dioxide. SO2, in the form of a rich solution or a gas, can be introduced into the lean solution in order to inhibit post-formation of sulfur. This introduction of SO2 avoids a tendency for sulfur to form continually after the solution exits the reaction zone.