文献类型：期刊文献

英文题名：Effect of Aromatic Pendants in a Maleic Anhydride-co-Octadecene Polymer on the Precipitation of Asphaltenes Extracted from Heavy Crude Oil

作者：Cheng, Ruzhen[1,2];Zou, Run[3];He, Long[4,5];Liu, Lei[4,5];Cao, Chang[4,5];Li, Xinyuan[6];Guo, Xuhong[1,2];Xu, Jun[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Large Ind Reactor Engn Res Ctr, Minist Educ, Shanghai 200237, Peoples R China;[3]Univ Manchester, Inst Sci & Technol, Dept Biomol Sci, Manchester M13 9PL, Lancs, England;[4]SINOPEC Northwest Co China Petr & Chem Corp, Urumqi 834001, Xinjiang, Peoples R China;[5]China Natl Petr Corp CNPC, Key Lab Enhanced Oil Recovery Carbonate Fractured, Urumqi 834001, Xinjiang, Peoples R China;[6]Sino Oil King Shine Chem Co Ltd, Langfang 065000, Hebei, Peoples R China

年份：2021

卷号：35

期号：13

起止页码：10562

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20212610564111);WOS:【SCI-EXPANDED(收录号:WOS:000670646600016)】；

基金：Financial support by the National Control Major Special Projects (2016ZX05053), the Key Technology Demonstration Project for EOR of Carbonate Oil and Gas Field in Tarim Basin, and the Commissioning Operation Company of China Petroleum Pipeline Engineering Co., Ltd. (TY-2020-04), Paraffin Remover and Inhibitor for High Waxy Crude Oil in Pipeline, is gratefully acknowledged.

语种：英文

外文关键词：Aromatic compounds - Nuclear magnetic resonance - Aniline - Grafting (chemical) - Hydrogen bonds - Ultraviolet visible spectroscopy - Nuclear magnetic resonance spectroscopy - Aromatization - Chemical analysis - Crude oil - Fourier transform infrared spectroscopy - Maleic anhydride

摘要：The precipitation and deposition of asphaltenes often cause great troubles to the recovery and transportation of crude oil. Adding polymer inhibitors is an effective approach to prevent asphaltenes from clogging. In this study, maleic anhydride-co-octadecene copolymers with imidazolyl, phenyl, and pyridyl pendants were synthesized. The inhibition behaviors of two extracted asphaltenes in the presence of these copolymers were investigated, which were also identified by the rheological tests of the heavy crude oil sample. The chemical structure of both asphaltenes was analyzed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), elemental analysis, and time-of-flight (TOF) spectrometry. Both asphaltenes A and B have a high aromaticity and low H/C. However, asphaltene B has a much higher aromaticity and polarity than that of asphaltene A. Ultraviolet-visible spectroscopy, turbidity meter, and dynamic light scattering (DLS) were employed to determine the precipitation behaviors of asphaltenes in the absence and presence of copolymers. The influence of intrinsic properties of asphaltenes, polymer concentration, and aromatic group grafting ratio on asphaltene precipitation were also compared. It is found that the initial precipitation point (IPP) of both asphaltenes is increased most by the copolymer containing 2-aminopyridine (PMO-2-P), while the copolymer containing N-(3-aminopropyl)imidazole (PMO-I) shows the worst inhibition performance. It is because that pyridine group has a stronger adsorption capacity with asphaltene than the imidazole group. The effect of various functional groups in copolymers on inhibiting asphaltene precipitation conforms to the following sequence: 2-aminopyridine > aniline > 4-aminopyridine > N-(3-aminopropyl)imidazole. It is also found that high polymer concentration and grafting ratio are beneficial to inhibit the asphaltene precipitation. As a result of the p-p conjugation and hydrogen-bonding attractions between the aromatic groups in the copolymers and the asphaltenes, the polymers can be stably adsorbed onto the surface of the asphaltenes and prevent their aggregation.