Recycle slurry oil characterization. Quarterly report No. 3, April 1-June 30, 1981

We received 69 samples of H-Coal PDU 10 recycle oils. All hydroclone overflow (HO) samples have been distilled, THF extracted and ashed. All HO soluble resids have been analyzed by solvent fractionation and the distillates by /sup 1/H-NMR. All clean oil tank (COT) samples have also been analyzed by /sup 1/H-NMR. Selected COT and HO distillate samples were analyzed by GC/MS, microautoclave (MAC) extractions and by fluorine derivatization followed by /sup 19/F-NMR. Selected HO soluble resids were analyzed by /sup 1/H-NMR. We conclude the following. Recycle distillates from PDU 10 (Wyodak, Syncrude) are extremely paraffinic, even able to form wax crystals at room temperature. The paraffin content of PDU 10 recycle distillates increased after day 20 of the run paralleling decreasing solvent quality as determined by /sup 1/H-NMR and MAC. The declining aromaticity of the recycle distillates over the end of PDU 10 is not a result of increased hydrogenation, but probably results from a decreasing removal of paraffins from the distillate recycle solvent. We have received 116 Lummus SCT, ASDA, and LC-Fining samples as of 9/15/81. As applicable, all samples have been distilled, THF extracted, ashed and analyzed by /sup 1/H-NMR and solvent fractionation. We conclude the following: Themore » solvent quality of the distillate portion of the TSL pasting solvent is very good. The first stage (short contact time or SCT unit) product quality, as preasphaltene content, is unaffected by space velocity over the range 115 to 190 lb/hr/ft/sup 3/. There appears to be no chemical alteration or physical fractionation of the 850/sup 0/F/sup +/ components during their transit through the antisolvent deashing (ASDA) unit. The coal conversion to THF solubles obtained in the process does not all occur in the first stage. In the LC-Finer operations with Wilsonville SRC feeds, low severity operation maintained product selectivity longer than high severity operation.« less