1402. HERBERT, W., AND RUPING, H. [Recovery With Activated Carbon of Benzine and Gas Oil From the Residual Gases From the Synthesis of Benzine by the Fischer-Tropsch-Ruhrchemie Process.] Chem. Fabrik, vol. 13, 1940, pp. 149-153; Chem. Abs., vol. 34, 1940, p. 4888.

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Literature Abstracts

Activated C Supersorbon absorbs 20% of benzine before permitting any loss in the exit gas from the absorber, and with proper operation, 1 lb. will produce over 1,000 lb. of product. With the plant operating for total benzine recovery the steam for regenerating is 2.5 lb. per lb. of benzine. The recovery of oil gas (3- and 4-C hydrocarbons) is about 95%, at which capacity the steam consumption is 3.5-4.0 lb. per lb. product. When both products are recovered simultaneously at atmospheric pressure from a residual gas containing 35-45% CO₂, the CO₂ is absorbed to such an extent that it amounts to 50% of the recovered gases, and when the hydrocarbons are liquefied, it is absorbed and lowers the calorific value. The compression efficiency also is lowered. These difficulties are overcome by the fact that toward the end of charging activated C with compounds of different molecular weights there is an enrichment of the heaviest molecules at the entrance side of the apparatus and of the lightest at the exist side, so that a fractional separation can be effected during regeneration. A flowsheet of a plant is shown, with some operating directions. At present 22 plants are operating or under construction with a daily capacity of about 1,400 tons of total product. Results with activated C and with oil washing are compared.