2571. PALLEMAERTS, F. A. F. [Underground Gasification of Solid Fuels.] Belgian Patent 469,188, May 1947. Chem. Abs., vol. 43, 1949, p. 1170.

Gasification is effected by means of a combustive fluid rich in O2 (air containing over 30% O2, commercial O2, or pure O2), which fluid may contain O2, H2O vapor, and/or CO2. The proportions of O2, H2O, and/or CO2 are such that the total gasification reaction is thermally virtually neutral.