School of Chemical and Process Engineering , University of Leeds , Leeds LS2 9JT , U.K.
School of Aeronautic Science and Engineering , Beihang University , Beijing 100191 , China.
Langmuir. 2019 Aug 20;35(33):10795-10807. doi: 10.1021/acs.langmuir.9b00481. Epub 2019 Aug 5.
Asphaltene aggregation and subsequent precipitation in the nonpolar medium may have a profound effect on plugging wellbores and production equipment. Continuing our work on controlled release of asphaltene inhibitor (AI) by using nanoemulsions (NEs), this work provides new evidence about long-term asphaltene stability by using optical measurement and reveals the kinetic processes of inhibitor transport/release mechanisms. Multiple light scattering (Turbiscan) and dynamic light scattering have been used to study "in situ" the effectiveness and performance of the proposed controlled release in three cases of asphaltene aggregation/precipitation in the presence of: (i) strong organic acids (dodecyl benzene sulfonic acid, DBSA), (ii) NEs (blank NEs), and (iii) NEs loaded with DBSA (DBSA NEs). The results suggested that the new approach reduced the amount of AI by ∼20 times and achieved high asphaltene inhibition efficiency of ∼84% with a prolonged release time. A mechanistic understanding of the controlled release effect was proposed based on the effect of DBSA NEs on the asphaltene particle morphology variation, which was related to the hydrophilicity of DBSA and the strong intermolecular interactions among all DBSA NE components. The release mechanism of the AI from the NE was evaluated using eight release models and was found to follow the Korsmeyer-Peppas kinetic model.
沥青质在非极性介质中的聚集和随后的沉淀可能对堵塞井筒和生产设备产生深远的影响。本工作继续使用纳米乳液（NE）进行沥青质抑制剂（AI）的控制释放，通过光学测量提供了关于长期沥青质稳定性的新证据，并揭示了抑制剂传输/释放机制的动力学过程。多重光散射（Turbiscan）和动态光散射已被用于研究在以下三种情况下的拟议控制释放的有效性和性能：（i）强有机酸（十二烷基苯磺酸，DBSA），（ii）NE（空白 NE），和（iii）负载有 DBSA 的 NE（DBSA NE）。结果表明，新方法将 AI 的用量减少了约 20 倍，并实现了高的沥青质抑制效率约 84%，释放时间延长。基于 DBSA NE 对沥青质颗粒形态变化的影响，提出了对控制释放效应的机械理解，这与 DBSA 的亲水性和所有 DBSA NE 成分之间的强分子间相互作用有关。使用八个释放模型评估了 AI 从 NE 中的释放机制，发现其遵循 Korsmeyer-Peppas 动力学模型。
