文献类型：期刊文献

英文题名：How comb-type poly(maleic acid alkylamide-co-α-olefin) assemble in waxy oils and improve flowing ability

作者：Xu, Jun[1];Zhang, Xingyu[1];Sun, Jie;Li, Li[1];Guo, Xuhong[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2009

卷号：4

期号：5

起止页码：551

外文期刊名：ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000271441300008)】；

基金：Financial support by National Postdoctor Science Foundation of China is gratefully acknowledged.

语种：英文

外文关键词：comb-type copolymer; waxy oil; cold flowing ability; rheology; assembly

摘要：Wax deposition in pipelines restricts flow and even leads to plugging during oil transportation. This paper aims to improve the flowing ability of cold waxy oils using comb-type copolymers to interact with main components of waxy oil: long-chain it-paraffins and asphaltenes. A series of comb-type poly(maleic acid alkylamide-co-alpha-olefin) (MAC) with different side-chain lengths were synthesized by copolymerization of alpha-olefin and maleic anhydride followed by amidation with alkylamine. Their effects on the rheological property (yield stress) and crystallization behaviors of both model waxy oils and crude oils were observed by rheology, differential scanning calorimetry (DSC), and optical microscopy. MACs reduced the yield stress of oils and the crystal size of long-chain n-paraffins, and improved the flowing ability of oils at 0 degrees C significantly. The MACs either self-assemble to nucleate the crystallization of long-chain n-paraffins or co-crystallize with them by the nonpolar side chains and inhibit the growth of paraffin crystals by the layer of the polar parts, while the carboxyl and amide groups interact with polar aromatic asphaltenes to prevent their aggregation upon cooling. (C) 2009 Curtin University of Technology and John Wiley & Sons, Ltd.