Sulfur recovery process

摘要

A process for removing sulfur compounds, particularly hydrogen sulfide, from a waste gas wherein sulfur dioxide is introduced into the process gas at multiple process locations. Quantities of sulfur dioxide are introduced into the process gas stream at one or more locations preceding catalytic reaction. The process of the present invention may be practiced for Claus processes involving initial thermal reactions, and may be practiced without necessity of preliminary thermal reaction. In an embodiment of the invention, one of the injection locations of sulfur dioxide is the thermal reactor.

主权项

1. A process for removing hydrogen sulfide from a waste stream comprising:
a first mixing step of mixing a sulfur dioxide stream with said waste stream to create a process stream, said process stream containing sulfur dioxide and hydrogen sulfide; a first reacting step of reacting said hydrogen sulfide with said sulfur dioxide in the presence of a catalyst; a first condensing step of condensing sulfur from said process stream; at least one subsequent mixing step of mixing at least one subsequent sulfur dioxide stream with said process stream; at least one subsequent reacting step of reacting said hydrogen sulfide with said sulfur dioxide in the presence of a catalyst; at least one subsequent condensing step of condensing sulfur from said process stream; an analyzing step of analyzing the amount of hydrogen sulfide and sulfur dioxide in said process stream; and a control step of adjusting flow of sulfur dioxide in at least one of said first mixing step and said at said at least one subsequent mixing step.