文献类型：期刊文献

英文题名：Improvement of oil flowability by assembly of comb-type copolymers with paraffin and asphaltene

作者：Li, Li[2];Xu, Jun[2];Tinsley, Jack[1];Adamson, Douglas H.[3];Pethica, Brian A.[1];Huang, John S.[1];Prud'homme, Robert K.[1];Guo, Xuhong[2]

机构：[1]Princeton Univ, Dept Chem Engn, Princeton, NJ 08544 USA;[2]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Univ Connecticut, Dept Chem, Storrs, CT 06269 USA

年份：2012

卷号：58

期号：7

起止页码：2254

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20122415119824);WOS:【SCI-EXPANDED(收录号:WOS:000304900700025)】；

基金：We thank Halliburton Energy Services Inc., the National Natural Science Foundation of China (Grant Nos. 20774028, 51003030, and 51003028), the 111 Project Grant B08021, the Fundamental Research Funds for the Central Universities, the Key Basic Research Project of Shanghai Science and Technology Commission (10JC1403800), and the Scientific and Technological Project of Shanghai Science and Technology Commission (10111100103) for support of this study.

语种：英文

外文关键词：crude oil; flowability; paraffin; asphaltene; comb polymer

摘要：Comb-type (maleic acid alkylamides-co-a-octadecene) copolymers (MACs) assemble with long-chain n-paraffins and asphaltenes by the hydrophobic alkyl branches and polar groups, respectively, and improve flowability of crude oils upon cooling. Their effects on the crystallization of paraffins from model oils were studied by rheology, optical microscopy, differential scanning calorimetry, and X-ray diffraction. Upon cooling, MACs change the size and shape of paraffin crystals and reduce the yield stresses of gels generated by precipitated solids. Deposition of wax was significantly suppressed by MAC as observed using a laboratory-scale deposition apparatus. MACs are more effective than poly(ethylene-butene) copolymers in improving the flowability of crude oils containing asphaltenes. The interactions between the carboxyl and amide groups of MAC with the polar aromatic asphaltenes appear to stabilize crudes through the steric effects of the long alkyl groups of MAC polymers, thereby reducing the strength of paraffin/asphaltene gels formed on cooling. (C) 2011 American Institute of Chemical Engineers AIChE J, 2012