METHOD OF ALMOST COMPLETE REMOVAL OF SULFUR COMPOUNDS HS, SO, cos and/or CS FROM OFF GAS FROM SULFUR SET-UP, AND RECOVERY OF THESE COMPOUNDS IN SULFUR FORM Russian patent published in 1999 - IPC

FIELD: chemical industry, more particularly almost complete removal of sulfur compounds H₂S, SO₂, cos and/or CS₂ from off gas from sulfur set-up. SUBSTANCE: off gas is made to contact with catalyst for hydrolysis of cos and CS₂ to obtain H₂S and if desired, in the presence of air stream with catalyst for oxidation of H₂S and preparation of hydrolyzed gas containing H₂S and SO₂ and free from cos and CS₂, and H₂S and SO₂ volume concentration is maintained in gas so that (H₂S)-2(SO₂) concentration is above 0.2 %, but less than 0.5%. Said gas is admitted into purification unit in which H₂S and SO₂ react with each other, said reaction being accompanied by sulfur formation and preparation of substantially purified pure off gas containing H₂S as sole sulfur compound. Purified gas is fed at temperatures from 80 to 100 C having excess air into catalyst unit in which H₂S becomes completely oxidized into sulfur. Higher than 99.9%; of sulfur compounds are recovered from off gas in the form of sulfur. EFFECT: more efficient removal method. 14 cl, 1 dwg