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Literature Abstracts

 1732.    ---------------.  [KEMMER, H.]  [Gas Improvement by Refrigeration and Catalysis.]  Gas u. Wasserfach, vol. 75, 1932, pp. 269-273; Chem. Abs., vol. 26, 1932, p. 3649.

       Gas is cooled by the usual water cooler, and than passed through an electric tar precipitator, after which it is cooled to 0 by NH3 liquor to remove NH3 and part of the naphthalene, light oil, etc., while the remainder of the naphthalene and light oil is removed by oil scrubbing at 10-15.  The gas is then further purified in the usual wet or dry S purifier.  A 2-stage Altenkirch-Borsig absorption refrigeration system is used to cool the NH3 liquor and oil; the operation of this apparatus is described.  Flue gases supply the necessary heat for this refrigeration system.  The gases may then be purified from remaining S by Lauta mass at 250-300, which removes the S to about 1-2 gm. per 100 m.3  After saturation the Lauta mass may be regenerated.  The best catalyst for removing CO was found to be one consisting of Fe 75, Ni 23 and Cr 2 parts, on active charcoal, or one of Ni and Al2O3 on pumice, said to be very insensitive to catalyst poisons.  These catalysts permitted a 1-stage conversion of the CO to CH4 and CO2 at about 360 and with the gas saturated with moisture at 60-70.  Energy losses on catalysts are said to be 0-2%.  Costs of operation are given for German conditions.