溶剂结构对萃取分离直馏柴油中不同环数芳烃的影响  

Effect of solvent structure on separation of different ring aromatics from straight-run diesel

作　　者：张宇豪 赵亮[1] 高金森[1] 徐春明[1] Yuhao Zhang;Liang Zhao;Jinsen Gao;Chunming Xu(College of Chemical Engineering and Environment,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)化学工程与环境学院,北京102249

出　　处：《中国科学：化学》2023年第9期1781-1791,共11页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金委员会青年科学基金(编号:22108302);中国石油大学(北京)科研启动基金(编号:2462022YJRC007);重质油国家重点实验室自主研究项目(编号:2021-09)资助。

摘　　要：“双碳”目标为我国炼化行业带来巨大挑战,产品结构调整势在必行.直馏柴油作为重要的石油一次加工产品,包含约80 wt%烷烃,是优质的低碳烯烃裂解原料.然而20 wt%的芳烃易在裂解过程中结焦,导致生产周期短,乙烯收率仅20 wt%左右.因此,需对直馏柴油进行高效的芳烃脱除.为此,本研究通过量子化学计算耦合液液相平衡实验的方法,对直馏柴油溶剂萃取脱芳烃过程中溶剂结构与不同环数芳烃的萃取性能关系进行探究.结果发现,强极性、环状且空间位阻较小的溶剂利于直馏柴油芳烃的脱除,随着芳烃环数的增加,其与溶剂的相互作用位点增多,脱除率和选择性越强.这不仅为芳烃萃取溶剂的优化提供理论支撑,也为不同环数芳烃的更精细的分离提供了思路.Refining and chemical industries in China are facing a significant challenge in adjusting their product structure to meet carbon peaking and carbon neutrality goals.One particular challenge lies in the production of low carbon olefin,which requires the use of straight-run diesel as an optimal feed for the cracking process.However,the presence of coking,caused by the 20 wt%aromatics content in straight-run diesel,has hindered the production cycle and the yield of target products.Efficiently separating the aromatics is therefore crucial in overcoming this challenge.To address this issue,a combination of quantum chemical calculation and liquid-liquid phase equilibrium experiments was employed to study the interaction between organic solvents and different ring aromatics.The research findings indicate that the separation of aromatics is facilitated by solvents with strong polarity,a ring structure,and low steric hindrance.Additionally,it was observed that the separation becomes easier with an increasing number of rings in the aromatics.These findings not only provide fundamental support for the development of extractive solvents but also offer a potential solution for the separation of different aromatics in the future.By implementing these insights,the refining and chemical industries in China can adjust their product structure to align with carbon peaking and carbon neutrality goals,ultimately contributing to a more sustainable and environmentally friendly future.

关 键 词：直馏柴油 芳烃分离 相平衡 相互作用能 

分 类 号：TE626.24[石油与天然气工程—油气加工工程]