2844.     ---------------.  [ROELEN, O.]  [Determination, Conversion, and Removal of Organically Combined Sulfur From Gas.]  Brennstoff-Chem., vol. 12, 1931, pp. 305-312; Ges. Abhandl. Kenntnis Kohle, vol. 11, 1934, pp. 446-480; Chem. Abs., vol. 25, 1931, p. 5970.

        Combustion methods of determination already proposed and modified give low results.  Conversion into H₂S by means of various catalysts and types of apparatus becomes incomplete after a short time.  CO and H₂S in contact with Fe at various temperatures form volatile S compounds not removable as H₂S from the gas.  The catalyst so sulfurized then forms organic S compounds with purified gas even at temperatures as low as 300°.  Maximum formation of organic S compounds on passing water gas or coke-oven gas, cracked with steam at high temperatures, over FE wool occurred at 100°.  None formed with CO-free gas or Al or Ag catalyst.  The formation of Fe_xS as an intermediate in the formation of COS and CS₂ from H₂S and CO is suggested.  For the production of gas low in organic S, coke-oven gas is passed through heated Fe-catalyst contact purifiers, after fist passing through CH₄ cracking units where steam at high temperatures also decomposes part of the organic S compounds.  Extensive bibliography.