THERMAL STABILITY OF HYDROCARBON FUELS.
Technical documentary rept. 1 Jun 64-31 May 65,
PHILLIPS PETROLEUM CO BARTLESVILLE OKLA
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A program to investigate the effect of storage time and temperature on changes in thermal stability quality as measured by the CRC-Modified Fuel Coker Supersonic Fuel or SSF for five widely different fuel types revealed no significant deterioration of any fuels after 36 weeks at ambient field condition or 22 weeks at 130F. After storage up to 36 days at 180F four fuels showed no loss in thermal stability, but an HF alkylate fuel, containing about 2 per cent olefins, showed a significant loss after only 6 days at 180F. Removal of dissolved oxygen to less than one part per million from the HF alkylate fuel prior to storage prevented deterioration. Phillips small scale 5-ml Bomb procedure, developed to measure changes in fuel thermal stability quality, was found to correlate satisfactorily with the ASTM-CRC Standard Fuel Coker for ASTM Type-A distillate fuels. The amount of dissolved oxygen in fuels has been found to affect, significantly, thermal stability quality as measured by the 5-ml Bomb and the Fuel Cokers. Removal of dissolved oxygen from fuels of low and average thermal stability invariably resulted in gross improvements. Only slight improvements were found after removing dissolved oxygen from fuels of very high thermal stability quality. Author