Abstract
In this study, a low-temperature demulsifier (TEP-L) was synthesized by a simple method using polyethylene glycol 1000, and low-cost and readily accessible cottonseed oil as raw materials. The cottonseed oil was first hydrolyzed and then directly reacted with polyethylene glycol 1000 to obtain TEP-L. The chemical composition of TEP-L was determined by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance hydrogen spectroscopy (1H NMR). A comprehensive investigation was conducted to explore the demulsification performance of TEP-L in water-in-oil (W/O) emulsion. The investigation notably considered the effect of demulsifier dosage, temperature, settling time, pH value, and salinity on the demulsification process. The results demonstrated that the dehydration rate (DR) could reach 100 % with 1000 mg/L of TEP-L at 40 ℃ for 21 h, or a dosage of 500 mg/L at 60 ℃ for 240 min. Moreover, TEP-L exhibited a DR exceeding 90 % over a broad pH range of 8–12 and displayed remarkable resistance to salt. Characterization methods such as surface tension (SFT), dynamic interface tension (IFT), zeta potential, and optical microscopy observation were utilized to investigate the demulsification mechanisms.
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