Abstract
A method for determining the cloud point of petroleum middle distillates by differential scanning calorimeter (DSC) has been developed. None of the 95 samples failed to crystallize at a rapid cooling rate on the DSC, and the degree of supercooling was quite low. The onset temperature of the crystallization peak tended to be a few degrees lower than the cloud point measured by the standard method, ASTM D-2500, but a very good correlation between the onset temperature of the crystallization peak and cloud point was found. On the basis of this correlation the cloud point can be determined satisfactorily by DSC. The new method is over three times more accurate and two to eight times less time consuming than the standard ASTM method.
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