Rockwell Internation has been developing technology for the flash hydropyrolysis (FHP) of carbonaceous feedstocks under U. S. Department of Energy (DOE) sponshorship since 1975. FHP is based on the high temperature (1100 to 1900 degrees F) reaction of pulverized soild carbonaceous feedstocks with hydrogen in a single-stage, short-residence-time, entrained-flow reactof. Gases and liquids are produced in the reactor and unreacted material forms a dry. Free-flying char. Following product gas quench, liquid products are seperated and gases are processed for recycle and product recovery. By varying the reactor operating conditions, the makeup of the product slate can be controlled over a broad range - from predominately a sycrude oil with SNG byproduct, to SNG with a relatively pure benzene byproduct, to SNG alone as the sole hydrocarbon product.