Frontiers of Chemical Science and Engineering >
Improved film evaporator for mechanistic understanding of microwave-induced separation process
Received date: 20 Nov 2018
Accepted date: 07 Jan 2019
Published date: 15 Dec 2019
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Microwave-induced film evaporation separation process has been reported recently to separate the polar/nonpolar mixture. However, the efficiency of the separation is still too low for practical applications, which requires further enhancement via different strategies such as optimization design of evaporator structure. In addition the depth understanding of the separation mechanisms is great importance for better utilization of the microwave-induced separation process. To carry out these investigations, a novel microwave-induced falling film evaporation instrument was developed in this paper. The improvement of the enhancement effect of microwave-induced separation was observed based on the improved film evaporator. The systematic experiments on microwave-induced separation with different binary azeotropic mixtures (ethanol-ethyl acetate system and dimethyl carbonate (DMC)-H2O system) were conducted based on the new evaporator. For the ethanol-ethyl acetate system, microwave irradiation shifted the direction of evaporation separation at higher ethanol content in the starting liquid mixture. Moreover, for DMC-H2O system microwave-induced separation process broke through the limitations of the traditional distillation process. The results clearly demonstrated the microwave-induced evaporation separation process could be commendably applied to the separation of binary azeotrope with different dielectric properties. Effects of operating parameters are also investigated to trigger further mechanism understanding on the microwave-induced separation process.
Key words: process intensification; microwave; falling film evaporation; separation; azeotrope
Xin Gao , Dandan Shu , Xingang Li , Hong Li . Improved film evaporator for mechanistic understanding of microwave-induced separation process[J]. Frontiers of Chemical Science and Engineering, 2019 , 13(4) : 759 -771 . DOI: 10.1007/s11705-019-1816-1
1 |
Stefanidis G D, Muñoz A N, Sturm G S J, Stankiewicz A. A helicopter view of microwave application to chemical processes: Reactions, separations, and equipment concepts. Reviews in Chemical Engineering, 2014, 30(3): 233–259
|
2 |
Gao X, Li X, Zhang J, Sun J, Li H. Influence of a microwave irradiation field on vapor-liquid equilibrium. Chemical Engineering Science, 2013, 90: 213–220
|
3 |
Stankiewicz A I, Moulin J A. Process intensification: Transforming chemical engineering. Chemical Engineering Progress, 2000, 96(1): 22–34
|
4 |
Perreux L, Loupy A. A tentative rationalization of microwave effects in organic synthesis according to the reaction medium, and mechanistic considerations. Tetrahedron, 2001, 57(45): 9199–9223
|
5 |
Komorowska-Durka M, van Houten R, Stefanidis G D. Application of microwave heating to pervaporation: A case study for separation of ethanol-water mixtures. Chemical Engineering and Processing: Process Intensification, 2014, 81: 35–40
|
6 |
Kappe C O. Controlled microwave heating in modern organic synthesis. Angewandte Chemie International Edition, 2004, 43(46): 6250–6284
|
7 |
Wang W, Liu Z, Sun J, Ma Q, Zhang Y. Experimental study on the heating effects of microwave discharge caused by metals. AIChE Journal. American Institute of Chemical Engineers, 2012, 58(12): 3852–3857
|
8 |
Chen F, Du X, Zu Y, Yang L, Wang F. Microwave-assisted method for distillation and dual extraction in obtaining essential oil, proanthocyanidins and polysaccharides by one-pot process from Cinnamomi Cortex. Separation and Purification Technology, 2016, 164: 1–11
|
9 |
Constant T, Moyne C, Perré P. Drying with internal heat generation: Theoretical aspects and application to microwave heating. AIChE Journal. American Institute of Chemical Engineers, 1996, 42(2): 359–368
|
10 |
Wang W, Chen G. Freeze drying with dielectric-material-assisted microwave heating. AIChE Journal. American Institute of Chemical Engineers, 2007, 53(12): 3077–3088
|
11 |
Appleton T J, Colder R I, Kingman S W, Lowndes I S, Read A G. Microwave technology for energy-efficient processing of waste. Applied Energy, 2005, 81(1): 85–113
|
12 |
Lupinska A. IR technique for studies of microwave assisted drying. Drying Technology, 2007, 25(4): 569–574
|
13 |
Salomatov A V, Salomatov V V. Thermal regime of slotted channel with moving incompressible liquid under microwave conditions. Journal of Engineering Thermophysics, 2017, 26(3): 359–365
|
14 |
Man A, Shahidan R. Microwave-assisted chemical reactions. Journal of Macromolecular Science, Part A. Pure and Applied Chemistry, 2007, 44(6): 651–657
|
15 |
Chandrasekaran S, Ramanathan S, Basak T. Microwave material processing—A review. AIChE Journal. American Institute of Chemical Engineers, 2012, 58(2): 330–363
|
16 |
Thostenson E T, Chou T W. Microwave processing: Fundamentals and applications. Composites Part a. Applied Science and Manufacturing, 1999, 30(9): 1055–1071
|
17 |
Werth K, Lutze P, Kiss A A, Stankiewicz A I, Stefanidis G D, Górak A. A systematic investigation of microwave-assisted reactive distillation: Influence of microwaves on separation and reaction. Chemical Engineering and Processing: Process Intensification, 2015, 93: 87–97
|
18 |
Li H, Cui J, Liu J, Li X, Gao X. Mechanism of the effects of microwave irradiation on the relative volatility of binary mixtures. AIChE Journal. American Institute of Chemical Engineers, 2017, 63(4): 1328–1337
|
19 |
Gao X, Liu X, Li X, Zhang J, Yang Y, Li H. Continuous microwave-assisted reactive distillation column: Pilot-scale experiments and model validation. Chemical Engineering Science, 2018, 31(186): 251–264
|
20 |
Li H, Liu J, Li X, Gao X. Microwave-induced polar/nonpolar mixture separation performance in a film evaporation process. AIChE Journal. American Institute of Chemical Engineers, 2019, 65(2): 745–754
|
21 |
Link G, Ramopoulos V. Simple analytical approach for industrial microwave applicator design. Chemical Engineering and Processing: Process Intensification, 2018, 125: 334–342
|
22 |
Estel L, Poux M, Benamara N, Polaert I. Continuous flow-microwave reactor: Where are we? Chemical Engineering and Processing: Process Intensification, 2017, 113: 56–64
|
23 |
Gabriel C, Gabriel S, Grant E H, Halstead B, Mingos D. Dielectric parameters relevant to microwave dielectric heating. Chemical Society Reviews, 1998, 27(3): 213–224
|
24 |
Ogunniran O, Binner E R, Sklavounos A H, Robinson J P. Enhancing evaporative mass transfer and steam stripping using microwave heating. Chemical Engineering Science, 2017, 165: 147–153
|
25 |
Niu X F, Du K, Xiao F. Experimental study on ammonia-water falling film absorption in external magnetic fields. International Journal of Refrigeration, 2010, 33(4): 686–694
|
26 |
Ortega J, Pena J A, De Anonso C. Isobaric vapor-liquid equilibria of ethyl acetate+ ethanol mixtures at 760 ± 0.5 mmHg. Journal of Chemical & Engineering Data, 1986, 31(3): 339–342
|
27 |
Chen M, Han G, Guo P, Xiao Z. Solute diffusion flux under microwave enhancement. Journal of Engineering Thermophysics, 2008, 29(11): 1950–1952
|
28 |
Won W, Feng X, Lawless D. Separation of dimethyl carbonate/methanol/water mixtures by pervaporation using crosslinked chitosan membranes. Separation and Purification Technology, 2003, 31(2): 129–140
|
29 |
Camy S, Pic J S, Badens E, Condoret J S. Fluid phase equilibria of the reacting mixture in the dimethyl carbonate synthesis from supercritical CO2. Journal of Supercritical Fluids, 2003, 25(1): 19–32
|
30 |
Horsley L H. Azeotropic Data-III. Advances in Chemistry, 1973, (116): 1–628
|
31 |
Walrafen G E. Raman spectral studies of water structure. Journal of Chemical Physics, 1964, 40(11): 3249–3256
|
32 |
Kryachko E S. Ab initio studies of the conformations of water hexamer: Modelling the penta-coordinated hydrogen-bonded pattern in liquid water. Chemical Physics Letters, 1999, 314(3-4): 353–363
|
33 |
Roy S, Humoud M S, Intrchom W, Mitra S. Microwave-induced desalination via direct contact membrane distillation. ACS Sustainable Chemistry & Engineering, 2017, 6(1): 626–632
|
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