Abstract
The modification of a polyisobutylene succinic anhydride adduct (PIB-SA) by esterification with polyethylene glycol (PEG 600, 1000 or 2000) to obtain mono- and diterminal polyoxyalkynated PIB-SA is described. Water-based oil spill dispersants were formed by reacting the monoterminal products with pentamethylene-hexamine (PMHA). The dispersion efficiencies of the prepared surfactants on asphaltenic crudes increased with increasing relative molar mass of the PEG used for grafting. An ethoxylated aminated PIB-SA gave good dispersion with waxy crude oil. The blending of sorbitan trioleate with the prepared surfactants increased dispersion efficiencies to approximately 100 per cent. Maximal dispersion efficiency was obtained with surfactant molecules containing 2 moities (polyoxyalkylene and polyamine units).