改性聚三乙醇胺阳离子表面活性剂的合成及浮选性能评价

以三乙醇胺为单体,经高温脱水缩合得到聚三乙醇胺(PTEA),采用溴代烷烃改性PTEA得到系列阳离子型季铵盐表面活性剂Rn-PTEA.采用FTIR和1H NMR表征了Rn-PTEA的结构,考察了烷烃链长度、季铵化程度对表面张力的影响,评价了Rn-PTEA的浮选性能并探讨了浮选机理.实验结果表明,随着烷烃链长度的增加,Rn...

Synthesis and flotation performance evaluation of modified polyethanolamine cationic surfactants

Using triethanolamine as monomer,polytriethanolamine(PTEA)was successfully synthesized via dehydration and condensation process at high temperature.Then a series of cationic quaternary ammonium salt surfactants Rn-PTEA were obtained by modifying PTEA with bromoalkanes.The structure of Rn-PTEA was characterized by FTIR and 1H NMR.The influences of the length of alkane chain and the degree of quaternization on the surface tension of Rn-PTEA were investigated.The flotation properties were evaluated and the flotation mechanism was discussed.The experimental results showed that the surface tension of Rn-PTEA decreased first and then increased with the alkane chain length getting longer.The surface tension of Rn-PTEA reduced with the increase of quaternization degree.The PTEA which was modified by bromooctadecane(molar ratio of bromooctadecane to PTEA was 1.1∶1.0)had the optimal flotation performance.With the addition of 100 mg/L,the turbidity reduction rate of the produced water was 96.32%for samples of some heavy oil field.Finally,the flotation mechanism is speculated as follows:flotation agent is preferably adsorbed to the bubble surface after it is added into the sewage,by changing the electrification and wettability of the bubble,the adhesion between the oil droplet and the bubble are strengthened,so the flotation effect gets to be improved.