3695. ----- [STUDIEN-UND VERWERTUNGS-G. M. B. H.] Removing Sulfur From Gases. British Patent 469,933, July 30, 1937. Chem. Abs., vol. 32, 1938, p. 1079.

Gases containing CO and H₂ are desulfurized by bringing them into contact with a catalyst at > 300°, whereby the bulk of the organic compounds are decomposed treating them at a reduced temperature for the removal of H₂S and finally bringing them into contact at an elevated temperature <300° with S-absorbing masses to remove the residual S. if desired, a preliminary elimination of H₂S can be effected before the first step of the above process is effected. Suitable catalysts for the first step are sulfurized metal turnings or steel wool, a mixture of Co sulfide and W oxide, Ni deposited on a ceramic carrier, or a spent sulferetted purifying mixture from the last step of the process. suitable absorbents for the last step include finely divided metals, spent hydrogenation catalysts, for example, finely divided Co or mixtures of alkali metal carbonates and oxide or hydroxides of Fe. The 2d stage may be conducted by employing a mixture of Fe₂O₃ and Na₂CO₃ followed by a spent dehydrogenation catalyst.

See also French Patent 797,902 (abs. 3696) and United States Patent 2,110,241 (abs. 2793).