Patent ID: 7250149
Filing Date: 2007-07-31
Classification: B01D,C01B,Y02P,Y10S

Abstract:
1. A process for removing sulfur compounds from a hydrogen sulfide off-gas containing hydrogen sulfide and other sulfur compounds and for removing nitrogen compounds from an ammonia off-gas containing ammonia and other nitrogen compounds, comprising: a thermal reaction step comprising combusting in a thermal reactor a first quantity of said hydrogen sulfide off-gas, a quantity of said ammonia off-gas and air to produce a process gas; a second hydrogen sulfide step comprising introducing into said process gas a second quantity of said hydrogen sulfide off-gas; a sulfur reaction and condensation process step comprising treating said process gas to condense sulfur from said process gas; a water vapor removal step for removing water vapor from the remaining process gas; a tail gas heating step for heating said remaining process gas; a sulfur dioxide addition step for adding sulfur dioxide to said remaining process gas; and a sulfur reaction step for generating sulfur from said remaining process gas; a tail gas cooling step to cool the remaining process gas; and a tail gas condensation step to condense sulfur from the remaining process gas.