Use of reaction products of partially glycolated polyalkenyl succinimides and diisocyanates as antifoulants in hydrocarbon process media
AssigneeBetz Laboratories, Inc.
InventorDavid R. Forester
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Abstract
Partially glycolated polyalkenylsuccinimide-diisocyanate reaction products are used as effective antifoulants in liquid hydrocarbonaceous mediums, such as crude oils and gas oils, during processing of such liquids at elevated temperatures. The reaction products are formed via a three-step reaction in which a polyalkenylsuccinic anhydride precursor is reacted with an amine to form polyalkenylsuccinimide intermediate which, in turn, is reacted with glycolic acid to form a partially glycolated bis-alkenyl succinimide, followed by adding a diisocyanate to the succinimide.
Claims12
A method of inhibiting fouling deposit formation in a liquid hydrocarbonaceous medium during heat treatment processing thereof at temperatures of from about 200.degree. C.-550.degree. C., wherein, in the absence of such antifouling treatment, fouling deposits are normally formed as a separate phase within said liquid hydrocarbonaceous medium impeding process throughput and thermal transfer, said method comprising adding to said liquid hydrocarbonaceous medium, an antifouling amount of from about 0.5-10,000 parts per million of a reaction product of a polyalkenylsuccinimide having the formula ##STR6## wherein R is an aliphatic alkenyl or alkyl moiety having at least about 50 carbon atoms and less than about 200 carbon atoms, Q is a divalent aliphatic radical, n is a positive integer, A is hydrocarbyl, hydroxyalkyl or hydrogen, Z is H or ##STR7## with glycolic acid to form a partially glycolated bis-alkenyl succinimide, followed by adding a diisocyanate to said partially glycolated bis-succinimide, said liquid hydrocarbonaceous medium comprising petroleum hydrocarbons or petrochemicals.
A method for inhibiting fouling deposit formation in a liquid hydrocarbonaceous medium during heat treatment processing thereof at temperatures of from about 200.degree. C.-550.degree. C. wherein, in the absence of such antifouling treatment, fouling deposits are normally formed as a separate phase within said liquid hydrocarbonaceous medium impeding process throughput and thermal transfer, said method comprising adding to said liquid hydrocarbonaceous medium, an antifouling amount of from about 0.5-10,000 parts per million of an antifoulant reaction product, said antifoulant reaction product formed by first reaction of polyalkenylsucinic anhydride with a polyamine to form a polyalkenylsuccinimide intermediate, followed by a second stage reaction of said intermediate with glycolic acid to form a partially glycolated bis-alkenyl succinimide, followed by adding a diisocyanate to said partially glycolated bis-succinimide, thereby forming said antifoulant reaction product, said liquid hydrocarbonaceous medium comprising petroleum hydrocarbons or petrochemicals, and said polyamine comprising an ethylenepolyamine.
Dependencies are inferred from the claim text.