Synthesis and application properties of acrylic modified cardanol polyether heavy oil demulsifier

Cardanol acrylate polyether ester (BGFAA) was synthesized from cardanol polyoxyethylene ether (BGF-10) and acrylic acid (AA) by direct esterification. The effects of different factors on the esterification rate were investigated, and the esterification process was optimized by response surface methodology. The results showed that the optimum technological conditions for the synthesis of BGFAA were obtained as follows: reaction temperature of 127℃, reaction time of 5.2 h, n(AA):n(BGF-10)=1.6:1.0, polymerization inhibitor dosage 0.6% (based on the total mass of BGF-10 and AA, the same below) and catalyst dosage 5%. Under these conditions, the esterification rate reached 93.23%. The structure of BGFAA was characterized by FTIR and 1HNMR. A novel polymer heavy oil demulsifier was prepared using self-made BGFAA and AA as raw materials. The demulsification and dehydration performance of W/O emulsion of Chen Zhuang heavy oil was studied by taking dehydration rate and oil absorbance of dehydrated sewage as indexes. When the demulsification temperature was 60℃, the demulsification time was 2.5 h, and the dosage of demulsifier was 500 mg/L, the dehydration rate reached 86.8% and the oil absorbance of dehydrated sewage was 1.05. Compared with two commercial demulsifiers, the prepared demulsifier has the advantages of high dehydration rate and clear water quality. © 2020, Editorial Office of FINE CHEMICALS. All right reserved.