Process for Practically Complete Removal of Hydrogen Sulfide from Low-Pressure Gases

摘要

A process is claimed for removal of hydrogen sulfide from low-pressure gases which involves bringing an aqueous solution of ferrates and ferrites of alkali metals such as sodium, potassium, etc. in contact with a low-pressure gas containing hydrogen sulfide in order directly to oxidize the hydrogen sulfide to sulfur; recovery of the sulfur; rough regeneration of the absorption liquid in an initial regeneration step by bringing it into contact with air having a low oxygen content and resulting from use in the subsequent step of complete regeneration of the solution; return of the major part of this roughly regenerated solution to the middle stage of the absorption tower; transportation of part of the roughly regenerated solution to a solution-regenerating tower which constitutes the step of complete solution regeneration, in which the solution will be almost completely regenerated by being brought into contact with fresh air having a high oxygen content; transportation of the resulting air with low oxygen content for reuse in the previously mentioned rough regeneration step; and transportation of the almost completely regenerated solution to the upper stage of the absorption tower in order ultimately to remove hydrogen sulfide from the gas. 4 figures. (ERA citation 08:013659)