The SRC-II process

The SRC-II process is such that a portion of the product slurry is recycled as a 'solvent' for the coal rather than using an all-distillate liquid as in the original version of the process. In particular, conversion of a large part of the dissolved coal to liquids makes it possible to eliminate the filtration step, the mineral residue drying step, and the product solidification step of the SRC-I process. A proposed demonstration plant program is discussed relative to investment costs and scale-up problems such as slurry mixing and pumping, slurry preparation, dissolver system, fractionation, pumping and handling of concentrated slurries, hydrogen purification, gasifier, and oxygen compression.