PATENT

3252. SCHARMANN, W.G., AND BARR, F.T. (Standard Oil Development Co.).  Method of Producing Motor Fuel.  United States Patent 2,436,938, Mar. 2, 1948; appl. filed Feb. 22, 1945, Serial No. 579,300; 13 claims (Cl. 196-56).

Gives process for producing motor fuel from solid carbonaceous materials by distillation-extraction treatment without the use of extraneous sources for the extracting oil.  An acyclic hydrocarbon oil, predominantly paraffinic, having an end boiling point similar to that of the volatile constituents of the carbonaceous material is used.  The synthetic hydrocarbon oil may may be obtained by subjecting the distillation residue to a water-gas reaction with steam, obtaining a CO:H₂ synthesis-gas mixture from the water gas and synthesizing liquid hydrocarbons from this gas.  Because of the absence of aromatics and napthenes in the synthetic oil, an amount not much greater than the volatile oils in the solid material may be used.  The total oil may be made up in part of oil obtained in the extraction process or from any conversion thereof.  When the synthetic oils, free of pitches and tars, are used, the pitch and tar of the solid material are either retained by the distillation residue or converted into low-boiling, noncoking oils so that the process yields a substantially pitch and tar-free distillate of considerably reduced coking tendency.  14 United States patents cited.