新型胺解原油降凝剂PSMA的合成与性能评价

Synthesis and properties evaluation of new aminated crude oil pour point depressant PSMA

采用分散聚合法以聚乙烯吡咯烷酮(PVP)为分散剂,无水乙醇为分散介质,合成了马来酸酐和甲基丙烯酸十八酯为单体的二元共聚物(PSMA-a),并对聚合物用苯胺进行酰胺化处理,得到降凝剂PSMA。采用傅里叶红外光谱和热失重对聚合物的结构和热稳定性进行表征。以大庆油田原油为实验对象,采用差示扫描热分析、石油凝点试验仪和石油产品运动黏度计对其进行了降凝降黏性能的研究。通过正交试验确定了最佳的单体配比、反应温度、反应时间和引发剂用量。实验表明,当降凝剂质量浓度为750mg/L,PVP用量为单体总质量分数的8%时,具有最佳的降凝降黏效果。

The copolymer poly（PSMA-a） composed of maleic anhydride and octadecyl methacrylate was synthesized with dispersion copolymerization method by using polyvinylpylrrolidone （PVP） as the dispersant and ethanol as the dispersion medium. Then the polymer was amidated by aminobenzene. The structure and thermal stability of the final polymer （PSMA） were characterized by Fourier trans- form infrared spectroscopy （FTIR） and thermal weight loss （TGA）. In this thesis, the crude oil from Daqing Oilfield station was taken as the experimental subject, the property of pour point depression and viscosity reduction were measured by differential scanning calorimetry （DSC）, oil solidifying point tester and viscosity tester. Then, the best ratio of monomer, reaction temperature, reaction time and dosage of initiator was determined through the orthogonal test. The results of the experi- ment indicated that the best pour point depression and viscosity reduction effect were achieved when the amount of the PPD taken in the experiment was 750 mg/L and the PVP dosage was 8% of total monomer mass.