Application of hyperbranched polymer demulsifier HPO-1 in the treatment of highly emulsified oily wastewater

Abstract

In order to improve the demulsification efficiency of highly emulsified oily wastewater, a hyperbranched polymer demulsifier HPO-1 was prepared by using hyperbranched polyethyleneimine HPEI and composite fatty acid monomer FO-1 as the main raw materials. Its structure was characterized by infrared spectroscopy and nuclear magnetic resonance 1HNMR spectroscopy. The interfacial activity was evaluated, and the effects of demulsifier dosage,temperature, settling time, and wastewater salinity on the demulsification efficiency of HPO-1 were investigated. The performance of HPO-1 were compared with the on-site demulsifier XCP-16S. The results showed that the interfacial activity and demulsification performance of HPO-1 were significantly superior to XCP-16S. When the dosage of HPO-1 was 50 mg/L, the temperature was 30 ℃, the settling time was 30 minutes, and the salinity of wastewater was 8 350 mg/L, the oil removal efficiency could reach 90.8%, and the residual amount of HPO-1 in the aqueous phase after demulsification treatment was less than 0.5 mg/L. The hyperbranched polymer demulsifier HPO-1 had a good on-site demulsification treatment effect on strongly emulsified oily wastewater from an offshore oil production platform in A Oilfield. After settling time of over 30 minutes, the oil removal efficiency could reach over 90%. The research results showed that hyperbranched polymer demulsifier HPO-1 could meet the demand for fast and efficient demulsification of highly emulsified oily wastewater.

Keywords

• oily sewage
• strong emulsification
• hyperbranched polymers
• demulsifier
• demulsification effect