236.    ---------------. [ BERTHELOT, C.] [Synthetic Motor Fuels.]  Mines, cariéres, No. 172, 1937, pp. 5-6; Coal Carbonisation, vol. 3, 1937, p. 150.

                 An outline is given of papers relating to the production of MeOH and Kogasin by catalytic reduction of CO with H₂, and the hydrogenation processes of Bergius, Vallettee, Audibert, and Pott-Broche.  The work of successive investigators is summarized, especially as regards the temperatures and pressures used.  In October 1936, 11 plants, including those of the Béthume and Liévin mines, were using stepwise hydrogenation in liquid and gaseous phases successively.  The 2d type of hydrogenation process, depending on preliminary extraction by solvents and subsequent direct hydrogenation in the gaseous phase, is being applied by the Mathias Stinnes concern in Essen.  The author emphasizes the serious cost of large, high-pressure, high-temperature catalytic tubes of special steel and commends from this standpoint the Vallette and Audibert processes.