College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China.
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China; Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China; Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu, Sichuan 610500, PR China.
Int J Biol Macromol. 2023 Aug 30;247:125573. doi: 10.1016/j.ijbiomac.2023.125573. Epub 2023 Jul 11.
The high viscosity of heavy oil made it difficult to exploit and transport heavy oil in pipeline. In this research, N-[(2-hydroxy-3-trimethylammonium) propyl] O-stearoyl chitosan tetraphenylboride (sc-CTS-st) was synthesized from chitosan, 2, 3-epoxy-propyl trimethyl ammonium chloride, sodium tetraphenylboron and stearyl chloride. sc-CTS-st contains long chain saturated aliphatic hydrocarbon, hydroxyl group and benzene ring, which could be dissolved in heavy oil fully and interacted with asphaltene. At 50 °C, the viscosity of heavy oil could be reduced to 13,800 mPa·s at most, with a viscosity reduction rate of 57.54 %. SEM and XRD showed that sc-CTS-st could affect the supramolecular accumulation structure of asphaltenes. Using FT-IR, sc-CTS-st could interact with asphaltene in the form of hydrogen bonds using the polar parts of the molecule, thereby weakening the self-association between asphaltene molecules. Molecular simulation was used to demonstrate the interaction mechanism between chitosan derivatives and asphaltenes. sc-CTS-st interacted with asphaltene through chemical bonding and influenced the self-association of asphaltene molecules. In addition, the non-polar portion of sc-CTS-st molecules could form a coating on the outside of the asphaltenes stacking structure, thus shielding or reducing the polarity of the stacking structure surface.
稠油的高粘度使得在管道中开采和输送稠油变得困难。在这项研究中，从壳聚糖、2,3-环氧丙基三甲基氯化铵、四苯硼酸钠和硬脂酰氯合成了 N-[(2-羟基-3-三甲基铵基)丙基] O-硬脂酰壳聚糖四苯硼酸盐（sc-CTS-st）。sc-CTS-st 含有长链饱和脂肪族烃、羟基和苯环，可以完全溶解在稠油中，并与沥青质相互作用。在 50°C 时，稠油的粘度最多可降低至 13,800 mPa·s，降粘率为 57.54%。SEM 和 XRD 表明，sc-CTS-st 可以影响沥青质的超分子堆积结构。使用 FT-IR，sc-CTS-st 可以通过分子的极性部分以氢键的形式与沥青质相互作用，从而削弱沥青质分子之间的自缔合。分子模拟用于证明壳聚糖衍生物与沥青质之间的相互作用机制。sc-CTS-st 通过化学键与沥青质相互作用，并影响沥青质分子的自缔合。此外，sc-CTS-st 分子的非极性部分可以在沥青质堆积结构的外部形成一层涂层，从而屏蔽或降低堆积结构表面的极性。
