Method for purifying high-temperature reducing gas

• Main Authors: INOUE; KENJI, SUEHIRO; MITSUGI, SERA; TOSHIKUNI, SHIMADA; AKIRA
• Format: Patent
• Language: English
• Published: 19.02.1991
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; FUELS; INORGANIC CHEMISTRY; LUBRICANTS; METALLURGY; NON-METALLIC ELEMENTS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLEGASES CONTAINING CARBON MONOXIDE; TECHNICAL GASES CONTAINING CARBON MONOXIDE

The present invention is directed to a method for purifying a high-temperature reducing gas by continuously circulating the processes of reducing a regenerated absorbent with the high-temperature reducing gas, until concentrations of aimed reducing gases have become uniform on upstream and downstream sides of the absorbent, and absorbing sulfur compounds by the use of this absorbent and thereby removing these sulfur compounds therefrom; the aforesaid method being characterized by using at least three reactors filled with the absorbent, by consisting of the four steps of reduction, absorption, SO2 reduction and regeneration, and by comprising the steps of feeding a circulating gas from the regenerating step to the SO2 reducing step; converting an SO2 gas produced in the regenerating step and the SO2 reducing step into elemental sulfur and recovering the latter as liquid sulfur; and introducing a part of the SO2 gas into the reducing step and returning the remaining SO2 gas to the regenerating step.