THERMAL STABILITY OF HYDROCARBON FUELS.
Rept. for 1 Jun 63-31 May 64,
PHILLIPS PETROLEUM CO BARTLESVILLE OKLA
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A 5-ml Bomb test method was modified to improve its ability to measure small differences in thermal stability quality of fuels. This test method is based upon the loss in UV light transmittance experienced when a 5-ml sample of the fuel is heated to a given temperature for twenty minutes. A threshold failure temperature for a given fuel is determined by heating the bomb over a range of temperatures to establish the level of heating required to produce an arbitrary loss of 25 units in light transmittance at 350 millimicrons wavelength. A significant relationship was found between threshold failure temperatures determined for eleven non-additive fuels using the 5-ml Bomb test method and the ASTM-CRC Coker, but not for seven additive-containing fuels. A good relationship was found between the 5-ml Bomb and MINEX heat exchanger test rig, using seven fuels, three of which contained additives. Several procedures were evaluated for accelerating the aging of fuels as possible test methods for predicting deterioration in thermal stability during storage. Procedures such as thermal stressing, ultraviolet irradiation, chemical initiation, and iron oxide catalysis, showed accelerated aging effects for a variety of fuels, as measured by deterioration in UV light transmittance. Author