Patent ID: 9181095
Filing Date: 2015-11-10
Classification: C01B

Abstract:
1. A method of pre-processing a feed to a Claus plant, comprising: feeding an acid gas stream comprising sulfurous compounds, optionally carbon dioxide, and ammonia to an absorber, and contacting in the absorber the acid gas stream with dilute phosphoric acid to thereby form an absorber overhead product and an absorber bottom product; using a heat source to heat the absorber to thereby maintain a temperature of the absorber overhead product at ≧100° C.; wherein the absorber bottom product contains substantially none of the sulfurous compounds of the acid gas stream and more than 50% of the ammonia of the acid gas stream, and wherein the absorber overhead product contains substantially all of the sulfurous compounds of the acid gas stream and less than 50% of the ammonia of the acid gas stream; feeding the absorber overhead product to a Claus unit, and feeding the absorber bottom product to a downstream device.