芳香性聚氨基酸破乳剂的制备及性能评价  

Synthesis and Evaluation of Aromatic Poly(amino acids)Demulsifiers

作　　者：王环江 杨启亮 张雨晨 吴珠玉 吕昱[1] 周国永 任嗣利 WANG Huanjiang;YANG Qiliang;ZHANG Yuchen;WU Zhuyu;LYU Yu;ZHOU Guoyong;REN Sili(Key Laboratory of Low-Dimensional Materials and Big Data,Guizhou Minzu University,Guiyang 550025,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Key Laboratory of Mining Engineering of Jiangxi Pro-vince,Ganzhou 341000,Jiangxi,China)

机构地区：[1]贵州民族大学低维材料与大数据重点实验室,贵阳550025 [2]江西理工大学资源与环境工程学院,江西省矿业工程重点实验室,江西赣州341000

出　　处：《材料导报》2024年第12期273-281,共9页Materials Reports

基　　金：国家自然科学基金(22262008,22078138);贵州省自然科学基金(ZK[2021]一般051);全国大学生创新创业项目(202051020102,S202110672045)。

摘　　要：以芳香族氨基酸苯丙氨酸为疏水单体、脂肪族氨基酸天冬氨酸为亲水单体,通过氨基酸N-羧基环内酸酐(NCA)单体的开环聚合(ROP),制备了一系列强极性、高芳香度的聚氨基酸类高分子破乳剂聚苯丙氨酸-聚天冬氨酸苄酯(PPA-b-PBAA),并对产物进行了结构表征和相对分子质量测定。采用瓶试法评价了PPA-b-PBAA的破乳性能,结果表明PPA-b-PBAA具有优秀的低温破乳效率,室温下2 min内能高效分离pH=6.0~11.0、含油量1.0%~10.0%(质量分数)的稀释沥青乳状液。其中,PPA-b-PBAA对1.0%(质量分数)的含油乳化废水的最佳脱水效率达到了99.98%,相应脱出水中残余油含量低至8.50 mg/L。破乳机理研究表明,PPA-b-PBAA加入油水乳状液后能快速迁移到达油水界面,通过与形成油水界面膜的沥青质、胶质相互作用,促使分散油滴絮凝聚并,实现油水分离。量子化学计算和弱相互作用分析表明,破乳剂PPA-b-PBAA分子与形成油水界面膜的主要成分沥青质之间产生的强相互作用有利于加速油水界面膜破裂和分散油滴聚并,是助推PPA-b-PBAA低温高效快速破乳脱水的关键。Aseries of high-performance aromatic and amphiphilic polyamides poly(L-phenylalanine)-block-poly(L-asparticacid-benzyl ester)(PPA-b-PBAA)demulsifiers were synthesized by the ring opening polymerization(ROP)of hydrophobic phenylalanine and hydrophilic aspartic acid N-carboxyanhydrides(NCA)monomer.The structure and molecular weight of the PBAA were characterized and gel permeation chromatography(GPC).The demulsification performance of PPA-b-PBAA demulisifers was evaluated by bottle test.The results showed that PPA-b-PBAA shows excellent low temperature demulsification capability,which can effectively separate oil in water emulsions with pH=6.0—11.0 and oil content of 1.0wt%—10.0wt%within 2 min at room temperature.The best demulsification efficiency of PPA-b-PBAA for treating 1.0wt%emulsion was as high 99.98%,corresponding to the residual oil content in the separated water was as low as 8.50 mg/L.The demulsification mechanism study indicated that when PPA-b-PBAA adding into the emulsion,which not only can quickly migrate to oil-water interface,and interact with and/or displace the stabilizers(asphaltenes/resins)of the emulsion.Finally,promote the dispersion of oil drops through flocculation and achieve oil and water separation.The interaction behavior between PPA-b-PBAA and asphaltenes was investigated by quantum chemical calculation and non-covalent interactions analysis(NCIs).The results revealed that PPA-b-PBAA has a stronger adsorbability for asphaltene molecules by van der Waals force.Due to the strong interaction between the demulsifiers and the asphaltenes,the protective film stabilizing the oil-in-water emulsion was more easily destroyed,thus promoting the oil droplets to coalesce to realize the separation of oil from water at room temperature.

关 键 词：油-水分离 聚氨基酸 芳香性高分子 破乳剂 破乳机理 

分 类 号：TH39[机械工程—机械制造及自动化]