719.    ---------------.  [DOLCH, P.]  [Synthesis Gas From Brown Coal.  Fundamentals.]  Brennstoff-Chem., vol. 20, 1939, pp. 101-111; Chem. Abs., vol. 33, 1939, p. 9592.

     Brown coal as a raw material for producing synthesis gas is examined in detail in low-temperature assays, composition, and yield of products from 3 mid-German and 1 Bohemian brown coals of varying tar contents.  Data obtained were analyzed in material balances and presented graphically.  From the calculated proportions of the various constituents in the products, behavior of these coals in the Bubiag-Didier process with (1) simultaneous tar degasification, (2) tar removal and return of detarred gases, (3) complete gasification with outside heat, and (4) gasification with tar recovery and outside heating; in the Wälz gas process of Pintsch-Hillebrand and Koppers; and in the O₂-steam gasification of the Winkler suspension and pit processes, ahs been predicted with detailed yield data.  Comparison indicates that the last-named process, in which heat-requirements of the gasification are met by separate gasification of part of the fuel, is far superior in yield of synthesis gas, particularly CO+H₂.