Abstract:
Hydrogenated alkyl aromatics are useful as petroleum oil additives such as wax crystal modifiers and cold flow improvers for petroleum oils, e.g. atmospheric distillate fuels, particularly when used in combination with ethylene backbone middle distillate pour point depressants such as branched polyethylene, copolymers of 4 to 30 molar proportions of ethylene with an unsaturated ester, e.g. vinyl acetate, or another olefin, etc.
Abstract:
The response of a middle distillate petroleum fuel oil to the addition of a flow improver, such as a copolymer of ethylene, whereby flow and pumpability at low temperatures are improved, is increased by incorporating said fuel oil a small proportion of a paraffinic wax in sufficient quantity to furnish from about 0.03 to about 2 weight percent of normal paraffin hydrocarbons whose average molecular weight is within the range of from 300 to 650. The paraffinic wax that is added has a molar heat of fusion that is greater than the molar heat of fusion of the first wax that separates from the fuel upon cooling to or below its cloud point. Preferably, the added wax contains normal paraffin hydrocarbons ranging from n-C24 to at least n-C28 inclusive.
Abstract:
Additive combinations of (A) alkyl aromatics, e.g., the condensation product of chlorinated wax and naphthalene, with: (B) ethylene-containing polymers, e.g., copolymers of about 4 to 30 molar proportions of ethylene copolymerized with an unsaturated ester, and/or (C) N-aliphatic hydrocarbyl succinamic acids and/or their amine salts, are cold flow improvers for distillate petroleum fuels.
Abstract:
The low temperature flowability of a middle distillate petroleum fuel oil, boiling in the range of about 250* to about 700* F. is improved and its pour point is lowered by adding to the fuel oil from about 0.01 to about 3 wt. % of an essentially saturated hydrocarbon fraction which is substantially free of normalparaffinic hydrocarbons, and which has a number average molecular weight in the range of about 600 to about 3,000.
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.