CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2016
·Vol. 95
·期 2
·364-371
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IF 1.066
Wenling Hu,Xiaolong Han,Liangliang Liu,Xin Zhang,Juanqin Xue,Baoyi Wang,Peng Zhang,Xingzhong Cao
Polyethylene glycol (PEG) of three different molecular weights was used to prepare PEG/PVDF composite membranes for separating organosulphur compounds from n -heptane by pervaporation. All the composite membranes were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and positron annihilation spectroscopy (PAS). The effects of operating temperature, feed sulphur content, and organosulphur species on performance of PEG/PVDF composite membranes with different molecular weights were investigated. When the feed organosulphur was thiophene, the fluxes decreased with an increase in PEG molecular weight, however, the enrichment factors were in a different order: PEG membrane with molecular weight of 35 000 exhibited the highest enrichment factor of 12.59 for thiophene at 85 °C. When the feed organosulphur was 2-methylthiophene or 2,5-dimethylthiophene, it was found that the PEG membrane with molecular weight of 100 000 showed the highest enrichment factor. The results showed that PEG molecular weight has a considerable effect on separation performance for pervaporation desulphurization.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Wenyan Shi,Xiaolong Han,Fang Bai,Chao Hua,Xingzhong Cao
The metal–organic framework MOF-505 particles were synthesized and incorporated into the polyethylene glycol (PEG) matrix to prepare mixed matrix membranes. A series of methods were used to characterize the structure and morphology of MOF-505 particles and membranes. The prepared MOF-505 had a well-developed pore structure, a large number of metal sites for selective adsorption of thiophene and good compatibility with polymer matrix. Accordingly, the desulfurization performance of the membrane was improved effectively. The effects of the content of MOF-505, operating temperature and feed sulfur content on membrane performance were investigated by pervaporation experiments. The membrane with 3 wt% MOF-505 showed the optimal desulfurization performance with a permeation flux of 2.66 kg/(m 2 ·h) and an enrichment sulfur factor of 8.15, which were increased by 158% and 25% versus pristine membrane, respectively.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xiaowei Wu,Yuqin Li,Zhengquan Yang,Mingyu Peng,Tian Gui,Xiangshu Chen,Hidetoshi Kita
A beta zeolite membrane reactor was first applied to improve conversion on the esterification of oleic acid and n-butanol at low temperature by rapidly removing the by-product water. In the pervaporation (PV)-esterification at low temperature of 353 K, the final conversion of oleic acid was significantly improved to 99.2 % in a short reaction time of 4 h. Even at an incredibly low esterification temperature of 333 K, the conversion of oleic acid reached 95.7 % in 4 h. Besides, the beta zeolite membrane reactor exhibited good hydrothermal and acid stabilities with a high oleic acid conversion (maintained above 99 %) after 5 reaction cycles. Through XRD and SEM characterization, it was found that the membrane kept complete crystal structure. Process intensification through a beta zeolite membrane reactor aided by PV was successfully used to enhance the esterification at low temperature in a short time, which was a promising coupling technology.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Guang Lu Han,Pei Yu Xu,Ke Zhou,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
A series of poly (arylene ether sulfone) block copolymers with hydrophilic segments containing fluorene groups were successfully synthesized as confirmed by 1 H NMR. The molecular weights were measured in the range 115–140 kDa by gel permeation chromatography (GPC). The hydrophilic segment showed a helical structure due to fluorene with butterfly-shaped framework in the main chain. With incorporating imidazolium groups, the microphase separation can also be achieved between the hydrophilic and the hydrophobic moieties. The membrane structure was characterized by positron annihilation lifetime spectroscopy (PALS) and small angle X-ray scattering (SAXS). The block copolymers were used to prepare membranes successfully for pervaporation separation of methanol (MeOH)/methyl tert-butyl ether (MTBE) mixture. The correlation between the membrane microstructure and the separation performance was discussed thoroughly. By increasing the hydrophilic segment proportion, the permeation flux increased while the separation factor declined. The membranes have the highest permeation flux (0.334 kg m −2 h −1 ) and the lowest separation factor (287) for a 15 wt% MeOH feed mixture at 40 °C, and the mass fraction of MeOH in the permeate is higher than 98 wt%.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2022
·Vol. 75
·期 10
·820-834
·
IF 1.224
Haikuan Yuan,Cun Bao,Ruiran Hao,Jie Lu
A polyvinyl alcohol (PVA)/SiO2 organic-inorganic hybrid membrane was fabricated, using PVA as the basic material, SiO2 nanoparticles as the inorganic material, γ-(2,3)-glycidoxy propyl trimethoxysilane (GPTMS) and 3-aminopropyl triethoxysilane (APTEOS) as the second modified agents. The dehydration performance of PVA-SiO2/polyacrylonitrile (PAN) composite membrane to ethyl acetate (EA)/H2O, EA/ethanol (EtOH)/H2O and EA/EtOH/acetic acid (HAc)/H2O solutions was investigated. After modification of the second coupling agent of APTEOS or GPTMS, PVA-SiO2/PAN composite membrane had the better dehydration performance to these aqueous solutions. When dehydrating PVA-SiO2/PAN composite membrane modified by GPTMS (M5 membrane) in EA/H2O binary solution (98/2, wt%) at 40°C, the separation factor and the total permeation flux were 5245 and 293.9 g m−2 h−1, respectively. The preparation method of PVA/SiO2 membrane through adding the second coupling agent was simple, it had good dehydration performance and has excellent application prospects. The sorption behavior of PVA/SiO2 hybrid membrane was systematically studied, providing sufficient data for studying the separation mechanism of pervaporative membrane. The degree of swelling (DS) and the sorption selectivity of the membrane in different feed compositions and temperatures were measured to determine the static sorption of membrane. Dynamic sorption more clearly reflects the sorption and swelling processes of the membrane, and the dynamic sorption curves of the membrane in EA aqueous solutions were obtained. The sorption behavior of membrane to permeate components was studied by ATR-FTIR. Changes in the characteristic peaks for the permeate components and membrane indicated the sorption behavior of the membrane.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2019
·
IF 4.182
Xixi Ma,Xiaocao Wu,Jürgen Caro,Aisheng Huang
A seeding-free synthesis strategy was developed for the preparation of dense and phase-pure MFI zeolite membranes based on “like grows like” principle. Through covalent modification of the porous ceramic supports by using 1H,1H,2H,2H-perfluoroalkyltriethoxysilanes (POTS), the support surface was changed from hydrophilic to hydrophobic, which promotes the nucleation and growth of hydrophobic MFI zeolite membranes. Thin, well-intergrown and phase-pure MFI zeolite membranes, with a thickness of about 2.0–3.0 μm, can be facilely prepared on POTS-modified supports like Al 2 O 3 and TiO 2 at 175 °C for 24 h. No cracks, pinholes or other visible macroscopic defects are observed in the membrane layer. The MFI zeolite membranes were evaluated in the hydrophobic separation of 5.0 wt% ethanol/water mixture at 75 °C by pervaporation . The MFI zeolite membrane prepared on the POTS-modified TiO 2 disk shows high pervaporation separation for ethanol recovery. At 75 °C, a separation factor of 103 and total flux of 2.56 kg/m 2 h can be obtained, which is promising to extract bio-alcohols from the fermentation broth.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2025
·
IF 4.7
Wenbin Zhao,Jinhuai Hua,Yi Cao,Rui Yao,Yanshuo Li
A microwave-assisted solvothermal method was developed to achieve La 3+ exchange in NaA zeolite membranes for enhanced ethanol dehydration via pervaporation. Traditional ion-exchange processes are time-consuming and risk structural degradation, whereas the proposed approach utilizes alcohol-based solvents under microwave irradiation to accelerate ion exchange while preserving membrane integrity. By optimizing solvent selection (isopropanol) and La 3+ concentration (0.04–0.05 mol L −1 ), the modified La-LTA membrane exhibited simultaneous improvements in water flux (up to 12.78 % increase) and separation factor (up to 227 % enhancement), particularly in low-water-content systems. Characterization via SEM, XRD, and XPS confirmed retained crystallinity and successful La 3+ incorporation (35.42 % exchange degree). The method's universality was validated by exchanging other ions (Li + , Cu 2+ , Nd 3+ ), with Li-LTA and Nd-LTA membranes also showing dual performance enhancements. This work provides an energy-efficient, scalable strategy to tailor zeolite membranes for industrial dehydration applications.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Huapu Zhao,Yaru Kong,Man Xu,Cunwen Wang,Yuan Liu,Yanbo Li
Pervaporation (PV) membranes for desalination show significant potential, attracting increasing attention. Herein, polyphenol (tannic acid) was used to crosslink chitosan to prepare composite membranes for pervaporation desalination. The effects of the coating method, the concentrations of chitosan (CS) and tannic acid (TA), the deposition time of CS and TA, and the thermal annealing time on the desalination performance of the pervaporation membranes were investigated to explore the relationship between membrane structure and pervaporation desalination performance. After optimizing the synthesis conditions, a high flux pervaporation desalination membrane (44 kg·m −2 ·h −1 at 50°C and 92 kg·m −2 ·h -1 at 70°C) with a NaCl rejection higher than 99.9 % was prepared by co-depositing chitosan and TA on a polysulfone support. This work demonstrates TA crosslinked CS composite membranes have promising research prospects and potential applications in pervaporation desalination.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Huapu Zhao,PanPan Su,Man Xu,Cunwen Wang,Yanbo Li
Pervaporation (PV) has shown great potential in desalination . Polyvinyl alcohol (PVA) is a widely used material for PV membranes. In the present work, hydrophilic composite membranes for PV desalination were prepared by coating mix solutions of PVA and Poly(methyl vinyl ether- alt -maleic anhydride) (PMVE-MA) on porous polyvinylidene fluoride (PVDF) supports. PMVE-MA, which serves as a macromolecular crosslinker , is well-compatible with PVA. The methyl ether groups in PMVE-MA also endow the crosslinked membrane to maintain good hydrophilicity . To achieve better performance, influences of the PVA concentration, the mass ratio of PVA to PMVE-MA, the crosslinking temperature and time, and the PVDF support on the desalination performance of the composite PV membrane were studied. At optimal conditions, a PVA-(PMVE-MA)/PVDF membrane was prepared. The membrane had a water flux of up to 45 kg·m −2 ·h −1 for the feed of 3.5 wt% NaCl solution at 50 °C (92 kg·m −2 ·h −1 at 70 °C). The salt passage was at an extremely low level and the conductivity of the permeate was lower than 100 μs/cm. In addition, the membrane showed excellent antifouling performance. After 14 h desalination of a sodium alginate-containing feed, the flux can be fully recovered by flushing the membrane in situ. The PVA-(PMVE-MA)/PVDF composite membrane shows great potential in desalination applications .
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Pengbo Zhao,Junquan Meng,Rui Zhang,Bing Cao,Pei Li
Pervaporation (PV) desalination membranes have good anti-fouling properties due to its hydrophilic dense surface structure. However, organic fouling is inevitable in long-term operation. Sodium hypochlorite (NaClO) is commonly used for cleaning organic pollutant, but it may damage polymeric membrane. Thus, designing membrane material with good chlorine resistance is crucial for expanding its lifespan. In this study, polyvinyl alcohol (PVA) was selected to prepare PV membrane in concern of its hydrophilicity and good film forming property. Its chlorine resistance was improved by removing the more active 1,2-diols of PVA by reacting with sodium periodate, grafting with poly (styrene-co-maleic anhydride) to decrease its crystallinity, and crosslinking using a fluorocarbon surfactant (FS). The resulting PV membrane exhibited the highest reported chlorine resistance of 768000 ppm·h among PV and RO membranes with a high-water flux of 44.5 ± 1.5 kg/m 2 ·h and salt rejection of 99.93%. A long-term fouling and cleaning cycle experiment was carried out using 10000 ppm humic acid to mimic organic foulants. The flux was recovered 100% after the NaClO cleaning. Hence, the chlorine-resistant PV membrane had the ability for sustainable desalination application.
研究领域:
高分子材料科学
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膜分离技术
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环境工程
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水处理
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化学工程
✓ 已验证
DOI
高影响因子
DESALINATION
·
2026
·
IF 9.9
Bashir Hashim Bashir,Gideon Muradi,Baoquan Zhang
Pervaporation desalination is a promising technology for treating hypersaline water, yet its broader application is constrained by the low water flux of conventional membranes. Herein, novel sodium alginate-polyamide (SA-PA) composite membranes were fabricated on hydrolyzed polyacrylonitrile (hPAN) ultrafiltration membranes via interfacial polymerization (IP) using a sequential deposition and one-step co-deposition method for pervaporation desalination. Comprehensive characterization revealed that the SA layer enhances hydrophilicity while the PA network ensures structural integrity. The sequentially fabricated s-SA-PA 1.0/hPAN membrane, with a well-defined layer structure, achieved a flux of 34.21 kg m −2 h −1 with 99.99% rejection (3.5 wt% NaCl, 70 °C), owing to its distinct hydrophilic SA layer and dense PA-selective layer. In the one-step co-deposition method, SA binds preferentially with piperazine (PIP) and tiles the water-hexane interface, thereby reducing the diffusion rate of PIP and restricting its diffusion pathways towards the hexane phase, resulting in a nanoscale structure with a thin, selective layer (~75–130 nm). This modulation of IP kinetics resulted in the one-step co-deposited c-SA-PA 2.0/hPAN membrane, which exhibited a superior flux (59.32 kg m −2 h −1 ) with a maintained rejection of 99.9%. Systematic evaluation of operational parameters and long-term testing confirmed the stability of these SA-PA composite membranes, demonstrating a sustainable strategy for high-performance desalination through bio-based polymers and scalable fabrication. This work establishes that precisely engineered nanoscale architectures in polymer composites can simultaneously enhance multiple membrane performance metrics, providing new design principles for advanced desalination materials.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Linglin Cheng,Meng Guo,Jing Zhong,Xiuxiu Ren,Rong Xu,Gang Li,Yanzhu Ji,Minghui Qiu,Masakoto Kanezashi
In the petroleum industry, the mixing of ethanol (EtOH), isopropanol (IPA), and n-butanol (n-BuOH) with water is a prevalent occurrence in both production and recovery phases. Obtaining the required degree of purity via dehydration poses a significant challenge that needs to be addressed. Pervaporation has emerged as a promising method for separating azeotropic mixtures due to its energy efficiency and independence from vapor-liquid equilibrium constraints. In this study, organosilica precursors, namely 1,2-bis(triethoxysilyl)ethane (BTESE), 1,2-bis(triethoxysilyl)ethylene (BTESEthy), and 1,2-bis(triethoxysilyl)acetylene (BTESA), were utilized for the fabrication of organosilica membranes using the sol–gel method. Subsequently, these membranes were employed for pervaporation dehydration of EtOH, IPA, and n-BuOH. This study investigates the effect of the degree of unsaturation of the bridged group, feed composition, and C atom count of alcohol on membrane dehydration performance. The membranes demonstrated superior separation performance for the n-butanol/water mixtures compared to other alcohol/water systems investigated. In this particular context, BTESE membrane exhibited a significant separation factor, although accompanied by a reduced permeation flux. Conversely, BTESA membrane demonstrated a decreased separation factor but an increased permeation flux. The comparison between gas permeation and pervaporation highlighted that the separation mechanism was primarily governed by molecular sieving through the organosilica membranes.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）