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      1239.  ------.  [I. G. FARBENINDUSTRIE A. G.]  [Gas Purification.]  German Patent 411,389, no date.  Schmide, J., Das Kohlenoxyd, Akad. Verlagsgesell., Leipzig, 1950, p. 214. 

            Continuous removal of S-compounds and carbonyls with steam over Fe₂O₃ then over active C or Cu oxide.

            See British Patent 228,959 (abs. 90) and United States Patent 1,766,763 (abs. 2685).