Dioctyl phthalate (DOP) is a widely used efficient plasticizer with great stability to heat and ultraviolet light, as well as the compatibility to use with PVCs resin. In this work, the process intensification of reactive extraction strategy is proposed to promote DOP synthesis in a biphasic system, with the halogen-free deep eutectic solvent (DES) [Im:2PTSA] as dual solvent-catalyst. First, the bifunctional effects of DES, which consists of imidazole (Im) and p-toluenesulfonic acid (PTSA), are experimentally demonstrated. Afterwards, the reactive extraction process is illustrated from both thermodynamic and kinetic aspects: (1) the thermodynamic analysis of σ-profiles that are derived from COSMO-RS theory is performed, and DES can intensify the phase splitting by forcing DOP and water into different phases, confirming the feasibility of conducting such an intensified process; (2) the esterification kinetics are investigated and fitted using the pseudo-homogeneous (PH) model, suggesting that the DES can efficiently catalyze the DOP formation. Finally, based on the liquid-liquid equilibrium predicted by COSMO-RS and the fitted kinetic model, the three-stage reactive extraction scheme is developed, with the DOP yield and purity at a high level, i.e., 98.61 % and 99.01 wt%, respectively.

邻苯二甲酸二辛酯（DOP）是一种广泛使用的高效增塑剂，对热和紫外线具有很好的稳定性，并且与PVCs树脂相容。在这项工作中，提出了以无卤素的深共熔溶剂（DES）[Im：2PTSA]为双溶剂催化剂的反应萃取策略，以促进双相系统中DOP的合成。首先，实验证明了由咪唑（Im）和对甲苯磺酸（PTSA）组成的DES的双功能作用。随后，从热力学和动力学两个方面说明了反应萃取过程：（1）σ的热力学分析进行了从COSMO-RS理论推导的剖面，并且DES可以通过迫使DOP和水进入不同的相来加强相分离，从而证实了进行这种强化工艺的可行性；（2）使用拟均相（PH）模型对酯化动力学进行了研究和拟合，表明DES可以有效地催化DOP的形成。最后，根据COSMO-RS预测​​的液-液平衡和拟合动力学模型，开发了三级反应萃取方案，其DOP的收率和纯度都很高，分别为98.61％和99.01 wt％，分别。