691.    DENT, F. J., BLACKBURN, W. H., WILLIAMS, N. H., AND MILLETT, H. C.  Investigation of the Use of Oxygen and High Pressure in Gasification.  I.  Gasification With Oxygen.  Rept. 39, Joint Research Committee, Institution of Gas Engineers and University of Leeds; Inst. Gas Eng. Commun. and Repts., Commun. 141, 1936, 76 pp.; Trans. Inst. Gas Eng., vol. 86, 1936-1937, p. 118; Chem. Abs., vol. 31, 1937, p. 7225.

     Discusses results for Lurgi plant using lignite.  Coke from Shariston and Warrenhouse coals were studied in a laboratory apparatus described.  The Warrenhouse was a more reactive and, therefore, a better product than the Shariston coke, giving lower outlet temperature, lower O₂ consumption, and less sensible-heat loss, and allowing the use of a lower steam:O₂ ratio.  Addition of Na₂CO₃ improved the reactivity of Warrenhouse coke.  Preheating of steam and O₂ also gave improved results.  Use of air-stream mixtures instead of O₂-steam increased the heat losses.  The influence on the results of rate of gasification and size of coke was studied.  Gives results for gasification using O₂-N₂ and O₂-CO₂ mixtures.  Blowing O₂ instead of air through a heated coke bed reduced CO formation and sensible-heat losses.