744.    DRAWE, R.  [High-Heating-Value Gas From the Oxygen Gas Producer.]  Gas- u. Wasserfach, vol. 76, 1933, pp. 541-545; Chem. Abs., vol. 27, 1933, p. 5172.

     At Tegel, brown coal was gasified at atmospheric pressure in an O₂ gas producer at the rate of 200 kg. per m.² producer area.  Higher rates were not possible because of limited O₂ supply.  The O₂ was saturated at 89°-93°.  No slagging was noted.  With O₂ saturated at 90°, 1 m.³ O₂ gave 16,000-17,000 cal. in the form of gas having the following analysis:  CO₂, 13.2%; O₂, 1.1%; illuminants, 2.3%; CO, 32.9%; H₂, 42.8%; CH₄, 1.1%; and N₂, 6.6%.  1 m.³ of O₂ was enough to gasify 4 kg. brown-coal briquets.  Experiments with an O₂ gas producer at elevated pressures by the Lurgi Gesellschaft für Wärmetechnik were limited by the O₂ supply to 900 kg. throughout per m.² of producer area per hr. at an operating pressure of 20 atm.  The back pressure with a 3-m. fuel bed was less than 50 mm.  At the higher pressure tar oils and light oil were easily separated by cooling.  The O₂ used had a purity of 72-73%, but calculations as to O₂ requirements were made on a basis of 90% O₂, indicating that requirements per 4,000 cal. in the form of gas were 0.202 m.³ at 1 atm., 0.110 m.³ at 10 atm., and 0.80 m.³ at 20 atm. operating pressure.  The calculated heating value of the CO₂-free gases reached a maximum of 534 B.t.u. per cu. ft. at 20 atm., so that this gas should be satisfactory for city gas.  An O₂ price equivalent to about $0.10 per 1,000 cu. ft. is assumed in estimating that this gas could compete with other sources of city gas.