Robust ZSM-5 Membranes for Efficient Bio-Oil Dehydration: Transport Mechanism and Its Implication on Structural Tuning

Li, Gang; Ma, Shanhong; Ye, Feng; Zhou, Liang; Wang, Yanhong; Lang, Xuemei; Fan, Shuanshi

doi:10.1021/acs.iecr.0c04671

Cited by 2 publications

(3 citation statements)

References 40 publications

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“…According to the figure, total flux, water flux, and TCE flux all increased as temperature increased. This phenomenon can be attributed to the direct relationship between temperature and vapor pressure, where an increase in temperature leads to an increase in the vapor pressure of the components present in the feed solution upstream of the membrane [ 43 ]. Consequently, this elevation in temperature also enhances the mass transfer driving force across the membrane.…”

Section: Resultsmentioning

confidence: 99%

Improving the Pervaporation Performance of PDMS Membranes for Trichloroethylene by Incorporating Silane-Modified ZSM-5 Zeolite

Song,

Zhang

et al. 2023

Polymers

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The hydrophobic nature of inorganic zeolite particles plays a crucial role in the efficacy of mixed matrix membranes (MMMs) for the separation of trichloroethylene (TCE) through pervaporation. This study presents a novel approach to further augment the hydrophobicity of ZSM-5. The ZSM-5 zeolite molecular sieve was subjected to modification using three different silane coupling agents, namely, n-octyltriethoxysilane (OTES), γ-methacryloxypropyltrimethoxysilane (KH-570), and γ-aminopropyltriethoxysilane (KH-550). The water contact angles of the resulting OTES@ZSM-5, KH-570@ZSM-5, and KH-550@ZSM-5 particles exhibited significant increases from 97.2° to 112.8°, 109.1°, and 102.7°, respectively, thereby indicating a notable enhancement in hydrophobicity. Subsequently, mixed matrix membranes (MMMs) were fabricated by incorporating the aforementioned silane-modified ZSM-5 particles into polydimethylsiloxane (PDMS), leading to a considerable improvement in the adsorption selectivity of these membranes towards trichloroethylene (TCE). The findings indicate that the PDMS membrane with a 20 wt.% OTES@ZSM-5 particle loading exhibits superior pervaporation performance. When subjected to a temperature of 30 °C, flow rate of 100 mL/min, and vacuum of 30 Kpa, the separation factor and total flux of a 3 × 10−7 wt.% TCE solution reach 328 and 155 gm−2·h−1, respectively. In comparison to the unmodified ZSM-5/PDMS membrane, the separation factor demonstrates a 41% increase, while the TCE flux experiences a 6% increase. Consequently, this approach effectively enhances the pervaporation separation capabilities of the PDMS membrane for TCE.

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Section: Resultsmentioning

confidence: 99%

Improving the Pervaporation Performance of PDMS Membranes for Trichloroethylene by Incorporating Silane-Modified ZSM-5 Zeolite

Song,

Zhang

et al. 2023

Polymers

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“…Pervaporation has been widely applied to liquid−liquid/ vapor−liquid separation with an emphasis on alcohol/water systems, 11−21 bio-oil dehydration, 22 hazardous substances and organic solvent removal from water, 23,24 solvent regeneration from complex mixtures, 25 isomer separation, 26 and glycol dehydration. 27−32 The pervaporation process benefits from the membrane selectivity in addition to the vapor−liquid equilibrium selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…Pervaporation has been widely applied to liquid–liquid/vapor–liquid separation with an emphasis on alcohol/water systems, − bio-oil dehydration, hazardous substances and organic solvent removal from water, , solvent regeneration from complex mixtures, isomer separation, and glycol dehydration. − The pervaporation process benefits from the membrane selectivity in addition to the vapor–liquid equilibrium selectivity. Only minor components (usually more volatile) of the mixture evaporate and transfer to the permeate side of the membrane; much less energy consumption is required compared with VLE-based separation technologies .…”

Section: Introductionmentioning

confidence: 99%

Solvent Regeneration by Thermopervaporation in Subsea Natural Gas Dehydration: An Experimental and Simulation Study

Ahmadi

Ansaloni

Hillestad

et al. 2021

Ind. Eng. Chem. Res.

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An in-house designed membrane process suitable for subsea natural gas dehydration was studied. The use of a membrane absorber together with a thermopervaporation (TPV) unit for solvent regeneration in a closed loop enables the effective and clean production of high-pressure natural gas close to the wellhead. This process avoids the continuous chemical injection for preventing hydrate formation in natural gas pipelines. The regeneration of the absorbent agent (triethylene glycol (TEG)) by TPV in the closed loop is highly energy-efficient, owing to the unlimited free cooling energy from the cold subsea water. In this work, the performance of membranes in TPV for TEG regeneration was evaluated experimentally for the first time. Morphological and permeation characterizations of an AF2400 thin-film composite membrane were carried out, and high separation factors outperforming the vapor–liquid equilibrium (VLE) were obtained for the solutions containing various water contents at feed temperatures ranging from 30 to 70 °C. The highest values of a separation factor (128,000) and a permeability (2380 (Barrer)) were obtained for the TEG solution containing 30 wt % water at 30 °C, while the highest water flux (468 (g/m2·h)) was reached at 70 °C. Moreover, the concentration polarization phenomenon induced by the temperature gradient was revealed in the membrane’s vicinity of the feed channel. A 3D computational fluid dynamics simulation was performed over the entire module to correct the driving force for a more precise assessment of the membrane permeance. The temperature and concentration profiles in the membrane module domains were explored, and a good agreement with experimental data was obtained.

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Robust ZSM-5 Membranes for Efficient Bio-Oil Dehydration: Transport Mechanism and Its Implication on Structural Tuning

Cited by 2 publications

References 40 publications

Improving the Pervaporation Performance of PDMS Membranes for Trichloroethylene by Incorporating Silane-Modified ZSM-5 Zeolite

Improving the Pervaporation Performance of PDMS Membranes for Trichloroethylene by Incorporating Silane-Modified ZSM-5 Zeolite

Solvent Regeneration by Thermopervaporation in Subsea Natural Gas Dehydration: An Experimental and Simulation Study

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