Tacoma 850°F+ SRC

Apparently the increase in heptane insolubles resulted from thermal repolymerization during distillation. The filtrate readily underwent this reaction but Tacoma 850° F+ SRC residue was unreactive because it already had been exposed to high temperature when isolated by distilla-... 

Processing Reconstituted SRC Filtrate. A synthetic blend of 850°F+ residual SRC in a coal-derived creosote oil was prepared and used in catalyst evaluation studies when SRC filtrate became unavailable. The synthetic blend was a 52 wt % mixture of residual Tacoma 850°F+ SRC dissolved in Koppers Tar creosote oil. 

However, the heptane insolubility of 850° F+ SRC residue from Tacoma (see Table I) showed little change when subjected to the same treatment as the filtrate from Tacoma. The 850°F+ SRC residue received from Tacoma had 81% heptane insolubles while the 850°F+ residue from the distillation of the reconstituted SRC filtrate, which is described below, had 87% heptane insolubles. This was a 6% increase in heptane insolubles in Tacoma residual SRC after thermal treatment compared with a 40% increase for the Tacoma filtrate heptane insolubles after the same treatment. 

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