文献类型：期刊文献

英文题名：Effect of polar/nonpolar groups in comb-type copolymers on cold flowability and paraffin crystallization of waxy oils

作者：Xu, Jun[1];Xing, Shili[1];Qian, Huiqin[1];Chen, Sheng[1];Wei, Xiaoming[2];Zhang, Rui[1];Li, Li[1];Guo, Xuhong[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Petrochina Liaohe Oilfield Co, Panjin 124010, Peoples R China

年份：2013

卷号：103

起止页码：600

外文期刊名：FUEL

收录：;EI(收录号：20125015776330);WOS:【SCI-EXPANDED(收录号:WOS:000311932200075)】；

基金：Financial support by National Natural Science Foundation of China (51003028, 21004021 and 11076002/A06), the Fundamental Research Funds for the Central Universities the higher school specialized research fund for the doctoral program (20110 074110003), and the Key Basic Research Project of Shanghai Science and Technology Commission (10JC1403800) are gratefully acknowledged. The authors also thank Petrochina Liaohe Oilfield Company for affording oil samples and technological supports.

语种：英文

外文关键词：Crude oil; Flowability; Comb-type copolymer; Paraffin; Polar/nonpolar group

摘要：Comb-type poly(maleic alkylamide-co-alpha-octadecene) copolymers (MACs) with various ratios of polar carboxyl group/nonpolar octadecyl group were synthesized. Upon cooling, MACs change the size and shape of paraffin crystals, and reduce the pour point and yield stress of waxy oils, as observed by rheology, polarizing light microscopy, differential scanning calorimetry, and X-ray diffraction. They also reduce the paraffin crystallization temperature and enthalpies, inhibit the formation of layer structure of paraffin crystals. Their efficiency to improve the cold flowability was found to correlate to the ratio of polar/nonpolar group (r). MAC with r of 0.4, is more effective than the other two in improving the flowability of waxy oils. It seems that MAC2 can balance the competitive assembly behaviors of copolymers with paraffins and asphaltenes. The assembly between the carboxyl and amide groups of MACs with polar aromatic asphaltenes appears to stabilize crude oil by the steric effects of the long-chain alkyl branches of MAC polymers, thereby improving the flowability of paraffin/asphaltene gels formed upon cooling. (C) 2012 Elsevier Ltd. All rights reserved.