Separation of Benzene-Cyclohexane Azeotropes via Extractive Distillation Using Deep Eutectic Solvents as Entrainers
The separation of benzene and cyclohexane azeotrope is one of the most challenging processes in the petrochemical industry. In this paper, deep eutectic solvents (DES) were used as solvents for the separation of benzene and cyclohexane. DES1 (1:2 mix of tetrabutylammonium bromide (TBAB) and levulini...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2021-02-01
|
Series: | Processes |
Subjects: | |
Online Access: | https://www.mdpi.com/2227-9717/9/2/336 |
id |
doaj-53bd20df8d18439c84eaf29edc8fa8fe |
---|---|
record_format |
Article |
spelling |
doaj-53bd20df8d18439c84eaf29edc8fa8fe2021-02-13T00:03:18ZengMDPI AGProcesses2227-97172021-02-01933633610.3390/pr9020336Separation of Benzene-Cyclohexane Azeotropes via Extractive Distillation Using Deep Eutectic Solvents as EntrainersFang Bai0Chao Hua1Jing Li2Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaThe separation of benzene and cyclohexane azeotrope is one of the most challenging processes in the petrochemical industry. In this paper, deep eutectic solvents (DES) were used as solvents for the separation of benzene and cyclohexane. DES1 (1:2 mix of tetrabutylammonium bromide (TBAB) and levulinic acid (LA)), DES2 (1:2 mix of TBAB and ethylene glycol (EG)) and DES3 (1:2 mix of ChCl (choline chloride) and LA) were used as entrainers, and vapor-liquid equilibrium (VLE) measurements at atmospheric pressure revealed that a DES comprised of a 2:1 ratio of LA and TBAB could break this azeotrope with relative volatility (αij) up to 4.763. Correlation index suggested that the NRTL modelling approach fitted the experimental data very well. Mechanism of extractive distillation gained from FT-IR revealed that with hydrogen bonding and π–π bond interactions between levulinic acid and benzene could be responsible for the ability of this entrainer to break the azeotrope.https://www.mdpi.com/2227-9717/9/2/336benzenecyclohexanedeep eutectic solvents (DES)extractive distillationentrainer |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Fang Bai Chao Hua Jing Li |
spellingShingle |
Fang Bai Chao Hua Jing Li Separation of Benzene-Cyclohexane Azeotropes via Extractive Distillation Using Deep Eutectic Solvents as Entrainers Processes benzene cyclohexane deep eutectic solvents (DES) extractive distillation entrainer |
author_facet |
Fang Bai Chao Hua Jing Li |
author_sort |
Fang Bai |
title |
Separation of Benzene-Cyclohexane Azeotropes via Extractive Distillation Using Deep Eutectic Solvents as Entrainers |
title_short |
Separation of Benzene-Cyclohexane Azeotropes via Extractive Distillation Using Deep Eutectic Solvents as Entrainers |
title_full |
Separation of Benzene-Cyclohexane Azeotropes via Extractive Distillation Using Deep Eutectic Solvents as Entrainers |
title_fullStr |
Separation of Benzene-Cyclohexane Azeotropes via Extractive Distillation Using Deep Eutectic Solvents as Entrainers |
title_full_unstemmed |
Separation of Benzene-Cyclohexane Azeotropes via Extractive Distillation Using Deep Eutectic Solvents as Entrainers |
title_sort |
separation of benzene-cyclohexane azeotropes via extractive distillation using deep eutectic solvents as entrainers |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2021-02-01 |
description |
The separation of benzene and cyclohexane azeotrope is one of the most challenging processes in the petrochemical industry. In this paper, deep eutectic solvents (DES) were used as solvents for the separation of benzene and cyclohexane. DES1 (1:2 mix of tetrabutylammonium bromide (TBAB) and levulinic acid (LA)), DES2 (1:2 mix of TBAB and ethylene glycol (EG)) and DES3 (1:2 mix of ChCl (choline chloride) and LA) were used as entrainers, and vapor-liquid equilibrium (VLE) measurements at atmospheric pressure revealed that a DES comprised of a 2:1 ratio of LA and TBAB could break this azeotrope with relative volatility (αij) up to 4.763. Correlation index suggested that the NRTL modelling approach fitted the experimental data very well. Mechanism of extractive distillation gained from FT-IR revealed that with hydrogen bonding and π–π bond interactions between levulinic acid and benzene could be responsible for the ability of this entrainer to break the azeotrope. |
topic |
benzene cyclohexane deep eutectic solvents (DES) extractive distillation entrainer |
url |
https://www.mdpi.com/2227-9717/9/2/336 |
work_keys_str_mv |
AT fangbai separationofbenzenecyclohexaneazeotropesviaextractivedistillationusingdeepeutecticsolventsasentrainers AT chaohua separationofbenzenecyclohexaneazeotropesviaextractivedistillationusingdeepeutecticsolventsasentrainers AT jingli separationofbenzenecyclohexaneazeotropesviaextractivedistillationusingdeepeutecticsolventsasentrainers |
_version_ |
1724272575220023296 |