Demulsification efficiency of some novel styrene/maleic anhydride ester copolymers

Abstract

Four demulsifiers were prepared in three steps. In the first step, styrene and maleic anhydride were copolymerized. In the second step, a long-chain alcohol (dodecanol) was reacted with the prepared copolymer to form the monoesterified copolymer. In the final step, the resulting product was further esterified with poly(propylene oxide) (PPO)-poly(ethylene oxide) (PEO) block copolymers of different molecular weights (1.1, 2.5, 3.0, 5.0, and 8.0 3 10 3 ) and different PPO/PEO ratios. The demulsification efficiency of these demulsifiers was investigated with the bottle test (Sany glass). The effects of the molecular weight and ratio of the PPO-PEO block copolymers on the demulsification efficiency were studied. The demulsification efficiency could be enhanced from 66% by an individual demulsifier to 100% by demulsifier blends. The surface-active and thermodynamic properties of the prepared demulsifiers were measured at 25, 35, and 458C. The kinematics of the demulsification process were photographed with a binocular microscope. The demulsification mechanism was found to occur in three stages, that is, adsorption and flocculation, coalescence, and channel formation followed by separation.

Surface active properties of chitosan and its derivatives

“…The most common examples of these substances are that built up of long chain alkyl or alkyl aryl hydrophobic moiety connected with hydrophilic, mostly, polyethylene oxide. Nonionic polymeric surfactants find wide applications in emulsion polymerization; [7] liquid crystalline phases [8], miceller enhanced ultrafiltration [9], surface modifications, [10] destabilization of water in crude oil emulsions [11,12] and other industrial applications.…”

Experimental and theoretical study of bifunctionalized PEO–PPO–PEO triblock copolymers with applications as dehydrating agents for heavy crude oil

“…Demulsifier blends for application include epoxy resinbased alkoxylates; polyoxyethylene-polyoxypropylenepolyoxyethylene (POE-POP-POE); alkylphenol-formaldehyde resin alkoxylates; orthoesters alkoxylates; and fatty acid alkoxylated and polyoxyalkylenated amines (Hellberg and Uneback, 2007;Al-Sabagh et al, 2008;Atta and Elsaeed, 2011).…”

Synthesis and Preliminary Demulsification Efficiency Evaluation of New Demulsifiers Based on Fatty Oils

“…On adding good demulsifier, an acceleration of flocculation and film rupture processes are performed as the demulsifier molecules which lower interfacial tension much more than the natural surfactants could replace the latter. [10] On the other hand, the enhancement of the rheological properties of the emulsion upon adding the demulsifier is one of the important factors that should be studied.…”