Methods for increased removal of drag reducer additives from liquid hydrocarbon fuel

The method of claim 68 wherein the M is selected from the group consisting of primary amines, secondary amines, tertiary amines, quaternary bases, pyridines, naphtyridines, guanidines, amidines, and salts thereof.

A method for increasing removal of DRA from liquid hydrocarbon fuel, said method comprising:

• producing contaminated liquid hydrocarbon fuel comprising a concentration of removable DRA comprising a quantity of one or more polar groups other than a single unsaturated terminal carbon-carbon bond;
• and,
• contacting said contaminated liquid hydrocarbon fuel with an amount of one or more removal agents under removal conditions effective to remove 60% or more of said removable DRA from said contaminated liquid hydrocarbon fuel, producing a reduced concentration of said removable DRA.

A method of modifying DRA to increase removal from liquid hydrocarbon fuel comprising:

• providing synthesized DRA consisting essentially of carbon and hydrogen and up to a single terminal unsaturated carbon-carbon bond;
• and,
• modifying said synthesized DRA to produce modified DRA comprising pendant polar groups effective to increase removal of said modified DRA from said liquid hydrocarbon fuel by one or more removal agents compared to removal of said synthesized DRA by the same one or more removal agents under the same conditions.

Modified DRA comprising a polymer backbone consisting essentially of carbon and hydrogen and up to a single terminal unsaturated carbon-carbon bond, said modified DRA further comprising a quantity of pendant polar groups effective to increase removal of said modified DRA from a liquid hydrocarbon fuel by one or more removal agents compared to removal of the same DRA absent said quantity of pendant polar groups under the same conditions.