CIESC Journal ›› 2021, Vol. 72 ›› Issue (8): 4204-4214.DOI: 10.11949/0438-1157.20201680

• Separation engineering • Previous Articles     Next Articles

Preparation of novel silver-based deep eutectic solvent and its application in separation of 1-hexene/n-hexane

Hu LI1(),Zisheng ZHANG1,Jiuzhou CHEN2,Haoliang SHI2,Yongjie SHI2,Hong LI1,Xingang LI1,Xin GAO1()   

  1. 1.School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, Tianjin University, Tianjin 300072, China
    2.CHN ENERGY Ningxia Coal Industry Co. Ltd. , Yinchuan 750011, Ningxia, China
  • Received:2020-11-23 Revised:2021-02-08 Online:2021-08-05 Published:2021-08-05
  • Contact: Xin GAO

新型银基低共熔溶剂制备及其在1-己烯/正己烷分离中的应用

李虎1(),张自生1,陈久洲2,石好亮2,石永杰2,李洪1,李鑫钢1,高鑫1()   

  1. 1.天津大学化工学院,精馏技术国家工程研究中心,天津 300072
    2.国家能源集团宁夏煤业有限责任公司,宁夏 银川 750011
  • 通讯作者: 高鑫
  • 作者简介:李虎(1996—),男,硕士研究生, lihufl@tju.edu.cn
  • 基金资助:
    宁夏自治区重点研发计划项目(2018BDE02057)

Abstract:

Normal alkenes and normal alkanes with the same carbon number are similar in structure, which makes their relative volatility less and more difficult to separate. As a designable green separating agent, deep eutectic solvent (DES) is widely used in the separation of such mixtures recent years. Additionally, the complexation between transition metal ions and double bond of olefin is focused on the separation of olefins and paraffins. In view of the above two aspects, a novel silver-based deep eutectic solvent (Ag-DES) was prepared and used in the separation of 1-hexene and n-hexane. The separation performance of 1-hexene was investigated systematically by a series of reactive extraction experiments on the effect of olefin concentration in the initial feed, molar ratio of silver ion to olefin and separating temperature. The results showed that Ag-DES had significant effect on the separation selectivity of 1-hexene to n-hexane within the range of 3.5—18 and exhibited excellent circulation stability. Furthermore, the chemical complexation and strong hydrogen bonds between Ag-DES with 1-hexene rather than n-hexane investigated by FT-Raman and quantum mechanical calculation are the essential reasons for the separation of 1-hexene and n-hexane. The study indicates that the reactive extraction separation intensification process using Ag-DES is of great significance for the efficient and green separation of 1-hexene from Fisher-Tropsch synthesis products.

Key words: silver-based deep eutectic solvent, reactive extraction, 1-hexene, n-hexane

摘要:

相同碳数的正构烯烃与正构烷烃因其结构相似,使其相对挥发度较小、分离难度较大。低共熔溶剂(DES)作为一种可设计的绿色分离介质被广泛应用于该类混合物的分离中,此外过渡金属与烯烃双键之间的化学络合作用是促进正构烯烃/烷烃分离的一个重要方法。鉴于此,开发了新型银基低共熔溶剂(Ag-DES),并将其应用于1-己烯/正己烷的分离,系统探究了原料中烯烃浓度、银离子与烯烃摩尔比、分离温度等对1-己烯分离性能的影响,结果显示Ag-DES具有良好的1-己烯/正己烷分离选择性,选择性在3.5~18之间,并具有出色的循环稳定性。进一步通过FT-Raman表征和量化计算揭示了Ag-DES与烯烃之间的化学络合作用和较强氢键作用是实现其与烷烃分离的本质原因,表明应用Ag-DES的反应萃取分离强化方法可实现从F-T合成油中绿色高效分离C6α-烯烃。

关键词: 银基低共熔溶剂, 反应萃取, 1-己烯, 正己烷

CLC Number: