Separation of the Methanol–Ethanol–Water Mixture Using Ionic Liquid

Abstract

Vapor pressure data for the binary systems (water/methanol/ethanol + 1-ethyl-3-methylimidazolium acetate ([EMIM]+[Ac]−)) and the ternary systems (methanol + water + [EMIM]+[Ac]−, ethanol + water + [EMIM]+[Ac]−, and methanol + ethanol + [EMIM]+[Ac]−) were measured by a modified equilibrium still. For the above systems, the maximum average relative deviation between experimental data and the UNIFAC-Lei model predicted values was 7%, confirming the prediction accuracy of the UNIFAC-Lei model. Thus, this model was further used to predict the isobaric vapor–liquid equilibrium (VLE) data at 101.3 kPa for the methanol + water + [EMIM]+[Ac]−, ethanol + water + [EMIM]+[Ac]−, and methanol + ethanol + [EMIM]+[Ac]− systems at a fixed mole fraction of ionic liquid (IL) (x IL = 0.2). It was demonstrated that the ionic liquid [EMIM]+[Ac]− was an appropriate entrainer to separate the methanol–ethanol–water mixture. On this basis, the extractive distillation process was simulated using the rigorous equilibrium (EQ) stage model. The results showed that the entrainer consumption, the heat duty of total reboilers, and the heat duty of total condensers decrease by 25, 6, and 6%, respectively, when [EMIM]+[Ac]− replaces the conventional entrainer ethylene glycol (EG). Furthermore, the σ-profiles and excess enthalpies obtained by the COSMO-RS model provided theoretical insights into the separation mechanism at the molecular level.

Ionic Liquid‐Based Stimuli‐Responsive Functional Materials

“…The inherent high thermal stability, good affinity with polar gases, and nonvolatility make ILs promising candidates as robust gas‐responsive materials and ILs are widely explored in fields of gas capture, gas sensing, and gas separation. [ 48–50 ] Generally, ILs are able to capture gases via van der Waals interactions or hydrogen bondings between them, and the change of their properties, such as conductivity and viscosity, can be utilized to detect and monitor the captured gases.…”

“…[13][14][15][16][17][18][19][20][21][22][23][24][25] The developments of advanced smart sensing, and gas separation. [48][49][50] Generally, ILs are able to capture gases via van der Waals interactions or hydrogen bondings between them, and the change of their properties, such as conductivity and viscosity, can be utilized to detect and monitor the captured gases.…”

Process design, evaluation and control for separation of 2,2,3,3‐tetrafluoro‐1‐propanol and water by extractive distillation using ionic liquid 1‐ethyl‐3‐methylimidazolium acetate

“…For designing the extractive distillation process to recover TFP from its aqueous solution, the vapor phase is assumed as an ideal gas. The NRTL model is adopted to describe the non-ideality of liquid phase, which is usually applied to correlate the vapor-liquid equilibrium (VLE) data concerning the ILs compared to the predictive UNIFAC 31 and UNIFAC-Lei 24 models. The binary interaction parameters of the NRTL model for IL-TFP, IL-water, 30 and TFP-water 5 are listed in Supporting Information, Table S1.…”

“…Meanwhile, liquid-liquid extraction was used to separate the mixture of TFP and water by Xu et al 17 and Li et al 18,19 Combining the advantages of extraction and distillation, Shen and Chien 20 provided a hybrid extraction-distillation flowsheet for separating TFP and water with energy savings. Recently, ionic liquids (ILs) as green solvents have been applied as entrainers to replace traditional organic solvents in extractive distillation [21][22][23][24][25][26] because of their negligible vapor pressure, high selectivity, and low toxicity. [27][28][29] In this paper, three extractive distillation processes with 1-ethyl-3-methylimidazolium acetate ([EMIM][Ac]) as a proper entrainer are designed based on the previous experimental work, which has shown that IL [EMIM][Ac] can effectively eliminate the azeotropic point of the mixture TFP and water.…”

Πειραματική Μελέτη Και Προσομοίωση Μιγμάτων Που Περιέχουν Τρίτης Γενιάς Ιοντικά Υγρά

“…[143][144][145][146][147][148] . H αμελητέα τάση ατμών τους, το μεγάλο θερμοκρασιακό εύρος στο οποίο παραμένουν στην υγρή φάση σε συνδυασμό και με τη μη ευφλεκτικότητα, αποτέλεσε το έναυσμα για την αύξηση του ενδιαφέροντος σχετικά με την εφαρμογή τους σε διεργασίες διαχωρισμού μιγμάτων [149][150][151][152][153][154][155][156][157][158][159][160][161][162][163][164][165][166][167][168] , στην εκχύλιση [169][170][171][172][173][174] , στην απορρόφηση αερίων [175][176][177][178][179][180] (π.χ. CO2).…”