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.

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Literature Abstracts

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.