二元聚合物的合成及在稠油破乳中的应用

Synthesis of binary polymer and its application in demulsification of heavy oil

摘要:

采用丙烯酸（AA）与自制丙烯酸壬基酚聚醚酯（NPEAA）为原料，在偶氮二异丁腈（AIBN）为引发剂，甲苯为溶剂的条件下，引发聚合制备了二元共聚物稠油破乳剂，采用FTIR、1HNMR对产物结构进行了确证，GPC测试了分子量；采用荧光光谱仪与表面张力仪测得其临界胶束浓度(CMC)为0.5g/L，表面张力为25.684mN/m。并以脱水率和脱出污水含油量为衡量指标，探讨了不同因素下聚合物破乳剂对陈庄稠油W/O乳液的破乳脱水性能，确定最佳破乳条件：温度55?C，时间2h，用量0.5g/L时，脱水率为88.5%，脱出水中含油量为198.4mg/L。研究了聚合物破乳剂对乳状液表观粘度、体系稳定性、油水界面的影响以及微观破乳过程，探讨分析得出聚合物破乳剂在油水界面更易润湿扩散，脱水速率快，破乳效果好。

Abstract:

Using acrylic acid (AA) and self-made nonylphenol polyether acrylate(NPEAA) as raw materials, under the conditions of azobisisobutyronitrile (AIBN) as initiator and toluene as solvent, a binary copolymer heavy oil demulsifier was prepared by initiating polymerization. The structure of the product was confirmed by FTIR and 1HNMR, and the molecular weight was tested by GPC. The critical micelle concentration CMC is 0.5g/L and the the surface tension is 25.684 mN/m measured by fluorescence spectrophotometer and surface tensiometer. Taking the dehydration rate and oil content of the dewatered sewage as measurement indicators, the demulsification performance of polymer demulsifier on Chenzhuang heavy oil W/O emulsion was discussed under different factors, and the optimal demulsification conditions are determined: when the temperature is 55?C, time is 2h, dosage is 0.5g/L, the dehydration rate is 88.5%, and the oil content in the dewatered water is 198.4 mg/L. The effects of polymer demulsifier on viscosity, system stability, oil-water interface and micro demulsification process of emulsion system were studied. It was found that polymer demulsifier is easier to wet and diffuse at oil-water interface, with fast dehydration rate and good demulsification effect.