两种嵌段聚醚对油水界面性质的影响

Effects of Two Block Polyethers on Properties of Oil-Water Interface

通过测定不同沥青质含量下,典型支链型嵌段聚醚破乳剂AE-1和直链型嵌段聚醚破乳剂SP169在不同质量浓度和温度下的界面张力、界面扩散热力学参数和界面扩张模量,研究了两种嵌段聚醚对油水界面性质的影响。实验结果表明,SP169破乳剂降低界面张力的能力更强;在温度与沥青质含量不变的情况下,SP169破乳剂的熵变小于AE-1破乳剂,表明SP169破乳剂分子在界面上的混乱度更小,组成了比AE-1破乳剂更为有序、紧凑的排列;AE-1破乳剂与沥青质形成的界面膜的扩张模量小于SP169破乳剂与沥青质所形成的界面膜的扩张模量,即加入AE-1破乳剂的油水界面膜的强度更弱。在温度65℃、含水率(以水的质量分数计)40%的条件下,AE-1破乳剂具有比SP169破乳剂更好的破乳性能。

The influences of two demulsifiers,namely a typical heavy oil demulsifier（AE-1：branched chain type block polyether） and a conventional demulsifier（SP169：straight chain type block polyether）,on the properties of oil-water interface were studied by determining interfacial tension（IFT）,thermodynamic properties of interfacial diffusion and dilation modulus of the oil-water interface with the different asphaltene content in the oil-phase under different demulsifier concentration and temperature. The experimental results showed that SP169 was stronger than AE-1 in reducing IFT. Under the same temperature and asphaltene content,the total entropy change of SP169 was smaller than that of AE-1,which indicated that the SP169 molecules arranged more orderly and compactly. AE-1 and asphaltene could form interfacial membrane and its dilation modulus was less than that of the interfacial membrane formed by SP169 and asphaltene,that is,the strength of the former was weaker. Under the conditions of 65℃ and mass fraction of water 40%,the demulsibility of AE-1 was better than that of SP169.