Synergistic formulations of functionalized copolymers and ionic liquids for dehydrated and desalted of medium, heavy and extra heavy crude oils

A formulation comprising a mixture of:

• a poly(ethyleneoxide) poly(propyleneoxide) poly(ethyleneoxide) block copolymer having an average molecular weight of 400 to 800 Daltons, a polydispersibility of 1.02 to 1.5, and bifunctionalized with an amine;
• and
• an ionic liquid having a cation selected from the group consisting of 1,5-dicarboxy-pentane-2-ammonium, pyridinium, isoquinolinium, imidazolium, ammonium and ammonium carboxymethane, and an anion selected from the group consisting of R5COO−, Cl−, Br−, [BF4]−, [PF6]−, [SbF6]−, [R6SO4]−, [OTs]−, [OMs]−, where R5 is an alkyl, cycloalkyl, benzyl, alkenyl, aromatic, or allyl-functionalized chain having 1 and 18 carbon atoms;
• and R6 is methyl or ethyl.