Abstract:
The response of a middle distillate petroleum fuel oil, boiling within the range of about 250* to about 670* F. at atmospheric pressure and containing normal paraffinic hydrocarbons within the range of about n-decane and n-hexacosane to the addition of a flow-improving additive such as a copolymer of ethylene, is improved by adding to the fuel oil a paraffinic distillate fraction, obtained from a crude petroleum, the said fraction boiling at atmospheric pressure within the range of about 450* to about 950* F. and containing normal paraffins higher than nhexacosane and as high as n-tetracontane, C40H82.