文献类型：会议论文

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[2]; Li, Li[1]; Guo, Xuhong[1]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; [2] Institute of Chemical Materials, China Academy of Engineering Physics, Sichuan, China

会议论文集：Chemical engineering in sustainable development Guest Editors: Xuhong Guo and Qingshan Zhu

语种：英文

外文关键词：Yield stress - Petroleum transportation - Rheology - Crystallization - Asphaltenes - Chains - Olefins - Crude oil - Paraffins - Differential scanning calorimetry

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 n-paraffins and asphaltenes. A series of comb-type poly(maleic acid alkylamide-co-α-olefin) (MAC) with different side-chain lengths were synthesized by copolymerization of α-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 °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. ? 2009 Curtin University of Technology and John Wiley & Sons, Ltd.