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 FexS 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.