Liquid-liquid phase equilibrium and interaction exploration for separation of azeotrope (2,2,3,3-tetrafluoro-1-propanol + water) with two imidazolium-based ionic liquids

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BACKGROUND: Phenol is an important chemical and has many applications in industry. It is mainly produced from coal tar. At present, the commonly used method in industry is caustic washing, which produces a lot of wastewater containing phenolic components, resulting in environmental contamination. Herein, a dual-functionalized ionic liquid, 1-hydroxyethyl-3-methylimidazolium propionate, was synthesized as a candidate for recovering phenol from a coal tar oil mixture. RESULTS:The performance of the ionic liquid was investigated by extraction experiments with various factors, including phase ratio, contact temperature and contact time. The optimal separation conditions for removing phenol using the ionic liquid were as follows: m DFIL :m oil = 1:5; contact temperature, 25°C; contact time, 30 min. The corresponding removal efficiency was 95.9%. The intermolecular interaction for separating phenol with the ionic liquid was verified to be hydrogen bond attraction using quantum chemical calculations and Fourier transform infrared spectrometry. CONCLUSIONS:The experimental and calculated results showed that 1-hydroxyethyl-3-methylimidazolium propionate was a suitable extractant for removal of phenol from the oil mixture. This provides a reference for the dephenolization process of coal tar in industry.

“…The mixture was divided into the upper oil phase and lower IL phase. RE was selected as an index to evaluate the performance for the adopted DFIL 28,29 and was calculated using Eqn (1):…”

Section: Separation Proceduresmentioning

confidence: 99%

Extraction performance evaluation and theoretical analysis of removal of phenol from oil mixture using a dual‐functionalized ionic liquid: 1‐hydroxyethyl‐3‐methylimidazolium propionate

Al-Haimi

et al. 2021

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“…The separation performance of ILs was analyzed in terms of the total annual cost (TAC) of the separation process through a sequential iterative method. [22][23][24] Since ILs are not conventional compounds in the Aspen Plus software database, the thermodynamic properties of ILs and the NRTL model parameters of benzene-n-propanol-IL ternary systems have not been included in the Aspen Plus software database. The performance of ILs in the separation of benzene-n-propanol mixture has not been comprehensively evaluated by Aspen Plus software but is limited to the analysis of VLE testing data.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of extractive distillation of benzene–n‐propanol with ionic liquid as entrainer

Wang

Feng

et al. 2021

BACKGROUND: The binary benzene-n-propanol azeotrope can be formed in chemical production. Extractive distillation is an important azeotrope separation technology and an ionic liquid is a type of excellent entrainer. Aspen Plus software was used to simulate the extractive distillation process. The separation performance of ionic liquids was evaluated in terms of total annual cost of the extractive distillation process. The separation mechanism of the azeotrope was quantitatively explained using intermolecular interaction energy. RESULTS: The thermodynamic properties databases of 1-octyl-3-methylimidazolium acetate, trioctylmethylammonium acetate and 1-decyl-3-methylimidazolium acetate were established in Aspen Plus software. The extractive distillation process was established through combining the thermodynamic properties of the three ionic liquids and the vapor-liquid equilibrium data of benzene-n-propanol-ionic liquid. The optimal operating conditions were obtained by minimizing the total annual cost of the separation process through a sequential iterative method. The interaction energy was calculated using density functional theory through Gaussian 09 software and used to explain the principle of the benzene-n-propanol azeotropic system separation.CONCLUSIONS: 1-Octyl-3-methylimidazolium acetate has the best separation performance among the three ionic liquids. The interaction energy can be used to screen and design ionic liquids in the process of benzene-n-propanol extractive distillation separation.

“…Also, TFP can be employed as an additive and detergent 3,4 . In its application process, water and TFP can form an azeotropic mixture (water 27.5 wt% / TFP 72.5 wt%) at 365.7 K under 101.3 kPa, 5 it consumes lot of energy to recover TFP using conventional distillation technology. Generally, enhanced distillation technologies are used to separate azeotropic mixtures in the chemical industry, including pressure‐swing distillation, 6,7 reactive distillation 8,9 and extractive distillation 10‐14 .…”

Section: Introductionmentioning

confidence: 99%

“…For energy reduction in processing, operations at moderate conditions and via the use of liquid–liquid extraction are adopted where possible for the separation of azeotropic mixtures 5,17,18 . Li et al 19 .…”

Section: Introductionmentioning

confidence: 99%

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Comparative evaluation of liquid–liquid equilibria for extraction of 2,2,3,3‐tetrafluoro‐1‐propanol from water by a ZIF‐8‐porous ionic liquid

Fan

Wang

et al. 2021

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BACKGROUND 2,2,3,3‐Tetrafluoro‐1‐propanol (TFP) is a benign solvent and widely used in the electronics industry as a cleaning agent. Because water and TFP can form an azeotropic mixture, it consumes energy to separate TFP from its aqueous mixtures using conventional distillation. RESULTS In this work, the zeolitic imidazolate framework‐8 porous ionic liquid (ZIF‐8‐PIL) and the ionic liquid (IL) N‐butyl pyridinium bis(trifluoromethyl sulfonyl) imide ([Bpy][NTf2]) are used as extractants to extract TFP from its aqueous solution. ZIF‐8‐PIL was synthesized by ZIF‐8 and IL [Bpy][NTf2]. The liquid–liquid equilibrium (LLE) data for the two systems (water + TFP + ZIF‐8‐PIL/IL) were determined at 298.15, 308.15 and 318.15 K under 101.3 kPa. The selectivity (S) and distribution coefficient (D) were examined to assess the extractive performance of ZIF‐8‐PIL and IL. The non‐random two‐liquid (NRTL) model was applied to fit the tie‐line data of the investigated mixtures. CONCLUSION The results demonstrate that ZIF‐8‐PIL is a suitable extractant to separate TFP with values of S and D greater than unity. The NRTL model has better correlation performance for the ternary systems with root mean square deviation lower than 0.01. The obtained parameters satisfy the minimum state of the mixed Gibbs free energy, which indicated that the model parameters are reliable. © 2021 Society of Chemical Industry (SCI).