Synthesis, modification, and demulsification properties of multi-branched block polyether demulsifiers

The author innovatively proposed a block polyether demulsifier. p-Tert-butylphenol amine resin was synthesized by the reaction of p-tert-butylphenol with formaldehyde and tetraethylenepentamine, which was used as an initiator to polymerize with ethylene oxide (EO) and propylene oxide (PO) to generate four multi-branched block polyether demulsifiers with different EO ratios. The demulsifier was characterized by infrared spectroscopy, Physica MCR 301 rheometer, and cloud point method. Then, 4,4′-diphenylmethane diisocyanate (MDI) and (Epichlorohydrin) POCL were used in the polyether demulsifier for oil-soluble and water-soluble modification. Finally, it was found that the oil-soluble emulsifier 159C has excellent demulsification performance and the dehydration rate is 86.2%.