Separation of dimethyl carbonate/methanol azeotropic mixture by pervaporation with dealcoholized room temperature-vulcanized silicone rubber/nanosilica hybrid active layer

Liu, Zhenhua; Lin, Wenhai; Qin, Li; Qiu, Rong; Zu, Huajun; Sang, Minghui

doi:10.1016/j.seppur.2020.116926

Cited by 15 publications

(6 citation statements)

References 51 publications

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“…The obvious advantage of DMC over other potential fuel additives (methyl tert-butyl ether or ethyl tert-butyl ether) consists in its slow decomposition into carbon dioxide and methanol (MeOH), which do not cause serious consequences when DMC is released into the environment [ 7 , 8 , 9 ]. Thus, DMC is fairly positioned as a “new base stone of chemical engineering” in the 21st century [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Hydrophilic polymers such as polyacrylic acid, polyvinyl alcohol [ 30 , 31 ], or chitosan [ 32 , 33 , 34 , 35 ] have been shown to be preferentially permeable toward MeOH in pervaporation of MeOH/DMC mixtures. A membrane with a silicone rubber/nanosilica hybrid active layer has been recently developed [ 10 ], which showed the preferential permeation of DMC during the pervaporation separation with inverse DMC/methanol selectivity.…”

Section: Introductionmentioning

confidence: 99%

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Novel Design of Co-Poly(Hydrazide Imide) and Its Complex with Cu(I) for Membrane Separation of Methanol/Dimethyl Carbonate Mixture

et al. 2023

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Poly(2,2′-biquinoline-6,6′-dicarbohydrazide)-co-(bistrimelliteimide)methylene-bisanthranylide (PHI) and its metal–polymer complex PHI-Сu(I) containing several types of functional groups (hydrazide, carboxyl, amide, and imide fragments) were synthesized to prepare two types of dense nonporous membranes. The study on morphology using scanning electron microscopy (SEM), measurements of mechanical, thermal, and transport properties of the membrane samples was carried out. The main mechanical properties of both membranes do not differ significantly, but the values of ultimate deformation differ palpably as a result of a non-uniform character of the deformation process for the PHI membrane. The thermal analysis based on the curves of thermogravimetric (TGA) and differential thermal (DTA) analyses of the PHI and PHI-Cu(I) membranes revealed peculiarities of the membrane structure. Transport properties were studied in pervaporation (PV) of methanol (MeOH) and dimethyl carbonate (DMC) mixtures including an azeotropic point. Intrinsic properties of the penetrant–membrane system were also determined. It was found that the total flux is higher through the PHI membrane, but the PHI-Сu(I) membrane exhibits a higher separation factor. Calculation of the pervaporation separation index (PSI) allowed to conclude that the PHI-Сu(I) membrane exhibits better transport properties as compared with the PHI membrane.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Design of Co-Poly(Hydrazide Imide) and Its Complex with Cu(I) for Membrane Separation of Methanol/Dimethyl Carbonate Mixture

et al. 2023

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“…The separation of alcohol-ester azeotropic systems in the chemical industry is a current challenging problem. − At present, the traditional methods used for alcohol-ester separation mainly include low-temperature crystallization, azeotropic distillation, extractive distillation, adsorption, etc. These methods suffer from large capital investment, high energy consumption, low efficiency, and complicated operation.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of free silicon hydroxyl groups, hydrogen-bonded silicon hydroxyl groups, and condensed silicon hydroxyl groups on the surface of SiO 2 , and their hydrophilicity and hydrophobicity, can be obtained by chemical modification. The size controllable, hydrophilic and hydrophobic properties of modified SiO 2 are suitable for the advantages in the field of pervaporation. , PDMS have unique advantages such as excellent chemical stability and good affinity for organics. It is considered to be an ideal material for pervaporation membranes. , …”

Section: Introductionmentioning

confidence: 99%

Molecular Simulation for Guiding the Design and Optimization of Mixed Matrix Membranes (MMMs) in the Pervaporation Process

Sun

et al. 2023

Langmuir

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Molecular simulation has been used extensively in the study of pervaporation membranes as a new economical and environmentally friendly research method. In this paper, A-SiO2/PDMS–PTFE mixed matrix membranes (MMMs) were prepared by molecular-simulation-guided experiments to achieve the separation of dimethyl carbonate/methanol (DMC/MeOH)) azeotropes. The interaction energy, X-ray diffraction pattern mean square displacement, and density field between PDMS and inorganic particles were analyzed by molecular dynamics simulations. The dissolution and diffusion processes of the DMC/MeOH azeotropes system in the MMM were simulated, and the surface-silylated silica (A-SiO2) with relatively better performance was screened. Based on the simulation results, A-SiO2/PDMS–PTFE MMMs were prepared by the coblending method, and the pervaporation separation performance of MMM membranes for DMC/MeOH azeotropes with different A-SiO2 loadings was investigated. When the A-SiO2 loading was 15 wt %, the separation factor of DMC/MeOH azeotropes at 50 °C was 4.74 and the flux was 1178 g m–2 h–1, which was consistent with the expected results of the simulation. The MMMs showed good stability in pervaporation over a period of up to 120 h. This study demonstrates that molecular simulations can provide a viable means for pretest screening and validation of experimental mechanisms, and to a certain extent, guide the design and optimization of pervaporation membranes.

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“…Notably, in these processes, because of the thermodynamic equilibrium and limited catalytic ability, excess methanol was generally used for obtaining the high efficiency. Therefore, the target product was always mixed with methanol, and the easily formed DMC/MeOH binary azeotrope (approximate methanol/DMC composition of 70%:30%) increased the complexity of DMC separation [ 14 , 15 , 16 ]. Until now, the available separation methods have included extractive distillation, liquid–liquid extraction, selective adsorption, lower temperature crystallization, and the membrane/distillation integrated process, etc.…”

Section: Introductionmentioning

confidence: 99%

Chemical Adsorption Strategy for DMC-MeOH Mixture Separation

et al. 2021

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The effective separation of dimethyl carbonate (DMC) from its methanol mixture through simple, inexpensive and low energy-input method is a promising and challenging field in the process of organic synthesis. Herein, a reversible adsorption strategy through the assistance of superbase and CO2 for DMC/methanol separation at ambient condition was described. The process was demonstrated effectively via the excellent CO2 adsorption efficiency. Notably, the protocol was also suitable to other alcohol (i.e., monohydric alcohol, dihydric alcohol, trihydric alcohol) mixtures. The study provided guidance for potential separation of DMC/alcohol mixture in the scale-up production.

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Separation of dimethyl carbonate/methanol azeotropic mixture by pervaporation with dealcoholized room temperature-vulcanized silicone rubber/nanosilica hybrid active layer

Cited by 15 publications

References 51 publications

Novel Design of Co-Poly(Hydrazide Imide) and Its Complex with Cu(I) for Membrane Separation of Methanol/Dimethyl Carbonate Mixture

Novel Design of Co-Poly(Hydrazide Imide) and Its Complex with Cu(I) for Membrane Separation of Methanol/Dimethyl Carbonate Mixture

Molecular Simulation for Guiding the Design and Optimization of Mixed Matrix Membranes (MMMs) in the Pervaporation Process

Chemical Adsorption Strategy for DMC-MeOH Mixture Separation

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