1042.    FISCHER, F., ROELEN, O., AND FEISST, W.  [Present Technical Position of the Benzine Synthesis.]  Brennstoff-Chem., vol. 13, 1932, pp. 461-468; Petrol Refiner, vol. 22, 1943, pp. 429-436; Ges. Abhandl. Kenntnis Kohle, vol. 11, 1934, pp. 501-516; U.O.P. Co. Lib. Bull., No. 1, 1944; British Chem. Abs., 1933, B, p. 136; Chem. Abs., vol. 27, 1933, p. 2017; vol. 38, 1944, p. 1089.

       Recent developments in the production of a suitable initial gas mixture, in the method of gas purification and in the preparation of the catalyst are reviewed.  The difficulty of temperature control in large-scale apparatus has been overcome by the design of a narrow, rectangular unit contact apparatus, 20 mm. by 120 cm. in cross-section and 5 m. long, which is packed with the catalyst (Ni-Mn-Al₂O₃) and maintained at the reaction temperature, 190°-210°, by the circulation of hot oil around it; the temperature control was made automatic without difficulty, and the apparatus then required little supervision.  The yield, 70 gm. of liquid product per m.³ of gas, CO 24%, H₂ 48%, was equal to that obtained in the laboratory-scale apparatus.  After about 1,000 hr. operation the catalyst required regenerating by extraction of the deposited paraffin wax with light petroleum.  By using a battery of such units the throughput of the plant could be increased to any desired value.