683.    ---------------.   [DEMANN, W.]  [Status of Low-Temperature Coking in Germany and Its Relation to the German Power Situation.]  Gas- u. Wasserfach, vol. 85, 1942, pp. 375-381; Chem. Abs., vol. 37, 1943, p. 4551.

      Review of low-temperature coking processes, with 52 refs.  Tar obtained by low-temperature coking of bituminous coal differs from that obtained from brown coal by its aromatic-naphthenic structure; gasoline obtained from this tar has an octane number of 80-90.  Coke from low-temperature carbonization of bituminous coal of an ash content of 2% or less is used for metallurgical purposes, for example, the manufacture of ferrosilicon.  To obtain tars suited for the manufacture of motor fuels several German gas works have installed special coking apparatus in their gas generators.  The Müller process (abs. 2337), which combines low-temperature coking with the Fischer-Tropsch hydrocarbon synthesis increases the oil yield of the synthetic process by 20-30%.