双金属卤化物与芳香烃分子络合作用机制及芳香烃高效分离应用基础

直馏石脑油中低浓度芳香烃的分离是其所含脂肪烃与芳香烃优化利用的前提，但目前尚没有从石脑油中分离出低浓度芳香烃的经济可行的工艺技术。混合二甲苯中对二甲苯的低能耗低成本分离是对二甲苯行业发展的必然要求，而现有分离工艺技术的能耗高、成本高或所用分离剂毒性大。上述两个过程都涉及到芳香烃从烃类混合物中的选择性高效分离。本项目提出利用双金属卤化物与芳香烃分子可定向络合的特性，依据络合物的物性差异实现芳香烃的选择性高效分离。本项目计划探索双金属卤化物与芳香烃分子的络合作用机制，研究双金属卤化物-芳香烃络合物的组成结构与其物性之间的构效关系，获得石脑油中芳香烃的络合分离规律以及混合二甲苯中对二甲苯的络合分离规律，形成石脑油中低浓度芳香烃的定向络合高效分离新方法，以及混合二甲苯中对二甲苯的低能耗低成本的定向络合高效分离新方法或络合-结晶分离新方法，同时为其它过程中芳香类化合物的分离技术研发提供参考。

The separation of low content aromatic hydrocarbons from straight-run naphtha is the prerequisite for the optimal utilization of both aliphatic hydrocarbons and aromatic hydrocarbons in naphtha. However, there is no economical and feasible technology to separate low concentration aromatic hydrocarbons from naphtha at present. The separation of paraxylene from xylene mixture at low energy consumption and low cost is an inevitable requirement for the development of paraxylene industry. However, the existing separation technologies have such disadvantages as high energy consumption, high cost or high toxicity of the used separating agent. Both processes involve the selective and efficient separation of aromatic hydrocarbons from hydrocarbon mixtures. In this project, the characteristic of directional complexation between bimetallic halides and aromatic hydrocarbons was proposed to realize the selective and efficient separation of aromatic hydrocarbons based on the difference of physical properties of the complexes. In this project, we plan to explore the complexation mechanism between bimetallic halides and aromatic hydrocarbon molecules, to study the structure-activity relationship of the composition structure of the bimetallic halide-aromatic hydrocarbon complex and its physical properties, and to obtain the complexation separation law of both aromatic hydrocarbons from naphtha and paraxylene from xylene mixture. Then, a new method of the directional and efficient separation of low content aromatic hydrocarbons from straight-run naphtha can be developed, as well as both a new method of the directional and efficient separation and a new method of the complexation-crystallization separation of paraxylene from xylene mixture at low energy consumption and low cost. This project study will provide reference for the research and development of separation technologies of aromatic compounds in other processes.