Research and Development of an Advanced Process for the Conversion of Coal to Synthetic Gasoline and Other Distillate Fuels. Quarterly Technical Progress Report No. 9, April 1979-June 1979

摘要

We carried out the fourth and fifth successful continuous dimethylformamide (DMF) - heptane extractions of SRC-II 350 exp 0 F+ Composite (SRC-II C). We have now tested four ratios of SRC-II C coal liquids, DMF, and heptane. The data confirm that we can operate the extraction column at suitable conditions to remove any desired amount of coal liquids as extract product. Countercurrent operation of the 33-stage, three inch, baffled, Scheibel extraction column gives exceptionally high throughputs with the DMF-heptane system. Analysis confirms that the basic nitrogen compounds are more difficult to extract than the oxygenated compounds, and neutral and acidic nitrogen compounds. We conclude from our present work that: (1) Liquid extraction of SRC-II C followed by hydrorefining is a unique and workable combination process which may prove to be economically attractive. (2) Countercurrent operation of the 33-stage, three-inch, baffled Scheibel extraction column gives exceptionally high throughputs on the DMF-heptane system. (3) The raffinate products of the 25 to 27% extractions contain 90 wt % aromatics, 0.4 wt % nitrogen and 0.3 wt % oxygen. (4) Hydrodenitrogenation of the raffinate product proceeds at a rate six times faster than non-extracted SRC-II C to yield a product possibly suitable as a hydrocracker or fluid catalytic cracker feed. (5) The extract products of the 25 to 27% extractions contain 8 wt % oxygen and 2.5 wt % nitrogen. (ERA citation 05:021640)