SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jianwei Yuan,Chengcheng Zhou,Jiawei Zheng,Qianqian Jia,Zhenggang Wang,Haipeng Zhu,Guozhen Liu,Yanan Guo,Zhenwei Zhang,Shuping Zhang,Pin Zhou,Gongping Liu,Wanqin Jin
The membrane-based pervaporation process presents substantial promise for the challenging separation of azeotropic mixtures. However, the efficiency of conventional polymeric membranes in achieving this remains suboptimal. To tackle this issue, there has been notable attention directed towards the amalgamation of metal–organic frameworks (MOFs) with polymer matrices, giving rise to the creation of mixed matrix membranes (MMMs). In this study, for the first time, we integrated MOF-303 crystals into a chitosan (CS) matrix, thereby pioneering the development of MOF-303/CS MMMs designed for the separation of azeotropic mixtures of methanol/methyl tert -butyl ether (MTBE). By employing the spin-coating method, a thin and defect-free MOF-303/CS membrane layer was effectively deposited onto a porous substrate. The morphology and physiochemical attributes of the synthesized MOF-303 crystals and the subsequent MOF-303/CS MMMs were analyzed using techniques such as SEM, XRD, TGS, and FTIR. The separation data revealed a marked enhancement in flux and methanol permeance upon the introduction of MOF-303 crystals into the CS membrane, whereas the increase in MTBE flux and permeance was relatively few, resulting in an augmented methanol/MTBE separation factor and selectivity. The optimized MOF-303/CS MMM demonstrated outstanding and enduring separation efficacy, demonstrating a total flux of 173 g/m 2 ·h and a methanol/MTBE separation factor of 209 at 40 °C for 10 wt% methanol-MTBE mixtures. Notably, this performance surpassed that of the pure CS membrane by nearly 1.6 times in total flux and 3.68 times in separation factor, respectively, underscoring its substantial potential in the efficient separation of azeotropic mixtures.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Tao Xi,Yingying Lu,Xinyu Ai,Lin Tang,Lulu Yao,Wentao Hao,Peng Cui
Benzene and cyclohexane are both important raw materials in polymer chemical industry. However, they are hard to be separated via the traditional distilling methods. In this work, ionic liquid copolymerized waterborne polyurethane (IL-co-PU) membranes were proposed for the pervaporation separation of benzene/cyclohexane mixtures. The results, including swelling rate, diffusion coefficients , partial flux, permeance and selectivity, showed that the IL-co-PU membranes could preferentially absorb and transfer benzene molecules rather than cyclohexane . The ILs might have functioned as facilitated transporter in the membranes. The permeation flux and separation factor of the IL-co-PU membranes increased simultaneously with the increase of IL contents. That is, these membranes had no trade-off between permeability and selectivity, which most of the polymer membranes suffered. With consideration of the good performance and easy handling property of the IL-co-PU membranes, they are of great potential in pervaporation separation of benzene/cyclohexane mixtures.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Qian Wang,Changchao Zhou,Li Shen,Eryue Song,Yu Yang,Haiqian Lian,Rujing Hou,Yichang Pan
The pervaporation (PV) technology is attractive for azeotrope component separation of the MeOH/MTBE mixture due to the reduced energy and cost relative to the traditional ternary distillation process. However, the membrane separation performance is largely affected by its microstructure including pore size and shape as well as its surface properties such as hydrophilicity. Herein, we report a Co-gallate MOF membrane that features preferential adsorption and diffusion of methanol (MeOH) relative to the methyl tert -butyl ether (MTBE) molecules during the PV separation process. The high-quality Co-gallate MOF membrane has been prepared by introducing a regulator of KOH. The MeOH flux of the Co-gallate MOF membrane was 0.565 kg m −2 h −1 and the separation factor was up to 721 at 15 wt% MeOH/MTBE feed composition. It is worth noting that the separation performance exceeds most of the reported membrane materials for MeOH/MTBE separation in the PV process. Furthermore, the separation performance of the Co-gallate MOF membrane for MeOH/MTBE mixtures remained almost unchanged over 70 h, indicating the reliable long-term stability of the membrane. Thus, the Co-gallate MOF membrane demonstrated a potential practical application for MeOH/MTBE separation.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 1
·49611
·
IF 2.52
Zongqi Zhang,Yuanfeng Wu,Lijing Gao,Guomin Xiao
This work aims at investigating the special application of ZSM-5/polydimethylsiloxane (PDMS) membrane being used for pervaporation separation of levulinic acid aqueous solutions. The effects of temperature, downstream pressure, feed concentration, and raw material ratio on the separation performance are investigated by self-made flat-sheet films. When the flow rate of feed pump remained at 0.4 ml/min (10 wt% levulinic acid), a levulinic acid permeation flux of 334.13 g/(m 2 h) and a separation factor of 2.382 at 75°C are observed over the composite membrane doped with 10 wt% ZSM-5. In addition, the acid resistance is enhanced after the PDMS membranes are doped with ZSM-5. Besides, the functionalized process also makes the membranes increase in its hydrophobicity. The results demonstrate that the ZSM-5/PDMS-based membranes show profound prospects for separating levulinic acid aqueous solution.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Heng Mao,Shen-Hui Li,Ao-Shuai Zhang,Li-Hao Xu,Heng-Xing Lu,Jing Lv,Zhi-Ping Zhao
Furfural is a typical biomass-derived platform chemical. Conventional processes for furfural production are uneconomical and energy-intensive because only about 3–6 wt% of furfural in the hydrolysate needs to be separated. In this study, a series of mixed matrix membranes (MMMs) were prepared by incorporating MIL-53(Al) particles (MAPs) into poly (ether-block-amide) (PEBA 2533) matrix for pervaporation separation of furfural from aqueous solutions. The MAPs with anisotropic morphology and tunable particle size were precisely synthesized by a high-efficiency solvent-controlled microwave synthetic strategy. Effects of MAPs on the microstructures, physicochemical properties of MAPs/PEBA MMMs were investigated in detail through SEM, EDS, XRD, FTIR, TGA, N 2 adsorption and contact angle measurements. The experimental results suggested that compared with the PEBA control membrane, the addition of MAPs notably reduced the permeation energy barrier for furfural, but not for water. The coin-like MAPs-16.7 filled MMMs presented the optimal separation performance, which exceeded other furfural-permselective membranes. Impressively, a high total flux of 3800 g∙m −2 ∙h −1 and an adequate furfural/water separation factor of 50.2 was achieved in PV separation of 1 wt% furfural aqueous solution at 80 °C, which could substantially reduce capital investment and equipment footprint. Furthermore, a continuous testing was operated for 200 h in ternary furfural/acetic acid/water simulated hydrolysate, highlighting the long-term membrane stability in realistic applications. High performance and long-term stability made MAPs/PEBA MMMs potential candidates for industrial furfural production.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Shengnan Yu,Zhongyi Jiang,He Ding,Fusheng Pan,Baoyi Wang,Jing Yang,Xingzhong Cao
Hybrid membranes with polydimethyl siloxane (PDMS) as the polymer matrix and metal organic framework (MOF) CuBTC ([Cu 3 (BTC) 2 ]) as the filler were fabricated and applied in pervaporative separation of thiophene from model gasoline. CuBTC submicroparticles with size of 0.2–0.3 μm were synthesized through a facile method at room temperature. The morphology, crystal structure and pore parameters of CuBTC, together with the morphology, functional groups, thermal and mechanical property, free volume characteristics, sorption and separation performance of PDMS–CuBTC hybrid membranes were studied. Primary functions of CuBTC particles are summarized as follows: (i) the channels of CuBTC provide expressways with low resistance for the transport of permeates; (ii) the submicroparticles interfere with the packing of PDMS chains, generating extra free volume of the membrane; (iii) the active metal sites of CuBTC facilitate the transport of thiophene; and (iv) the channels of CuBTC sieve thiophene from the bulk of model gasoline. As a result, the normalized flux and selectivity of PDMS membranes are elevated simultaneously. The optimal separation performance is achieved when the weight ratio of normal CuBTC to PDMS reaches 8%, with a permeation flux of 194.2 kg μm/(m 2 h) and an enrichment factor of 5.2 (increase by 100% and 75% compared with PDMS control membrane, respectively).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanqiu Wang,Tianheng Wang,Shaobin Wen,Liyuan Fan,Mengshi Chen,Yaqi Dong,Qiang Zhang
Pervaporation technology is suitable for separating organic solvent azeotropic mixtures or isomers that are challenging for traditional distillation methods. However, the conventional methods to fabricate pervaporation membranes often lead to limitations in membrane performance and stability, such as the restrictiveness of material selection and the high costs of manufacturing. Herein, we utilized commercially available inexpensive monomers CE (3,4-Epoxycyclohexylmethyl) and DOX (3-ethyl-3-[(3-ethyloxetan-3-yl)methoxymethyl]oxetane), along with the sulfonium salt photo-initiator (Ar6S 2+ SbF 6- ), to fabricate pervaporation membranes through cationic photopolymerization, resulting in separation layers enriched with ether groups. The resulting pervaporation membranes were employed to separate ethanol/n-hexane and ethanol/cyclohexane azeotropes formed during the production of ethyl acetate. The separation efficiency was significantly enhanced compared to the original PVDF membranes, achieving a separation factor of up to 162.81 for ethanol/n-hexane azeotrope and 41.89 for ethanol/cyclohexane azeotrope. During the 110-hour prolonged operation test, the membranes demonstrated exceptional tolerance and long-term stability against different organic solvents.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wei Chen,Pengfei Wang,Weike Jia,Huidan Zeng
Silicalite-1 zeolites/polymer composite membranes are among the most reliable materials for the pervaporation separation of m-X from xylene isomers. However, the separation factors of the present silicalite-1 zeolites/polymer composite membrane are low. This work has succeeded in fabricating dense and defect-free silicalite-1/PVA composite membrane for first improving the pervaporation separation performance of m-X/p-X isomers. The silicalite-1/PVA composite membrane was prepared by combining solution scraping and vacuum thermal crosslinking methods with fumaric acid as a crosslinker (denoted as silicalite-1/PVA-V). The silicalite-1/PVA-V composite membrane with a thickness of 15.3 μm, prepared with a fumaric acid/monomeric unit of PVA molar ratio of 0.05 after vacuum thermal crosslinking at 160 ℃ for 2 h, exhibited dense and defect-free structure with extremely low xylene swelling degree, good structural stability and mechanical properties as well as excellent pervaporation separation performance. Compared to the pure PVA membrane, the silicalite-1/PVA-V composite membrane exhibited better selective separation performance of m-X isomer. The temperature, amount of fumaric acid, crosslinking degree and membrane thickness significantly influenced the pervaporation separation performance. The optimum selective separation factor of m-X/p-X isomers and the corresponding total permeate flux were about 9.85 and 59.15 g·m −2 ·h −1 (60 ℃), respectively. The pervaporation experiments of long-time and repetitively prepared membrane demonstrated that the silicalite-1/PVA-V composite membrane had long-term structural stability and reproducibility. To demonstrate scalability, we showed that our strategy could produce large-size silicalite-1/PVA-V composite membrane with an area of 1000 cm 2 , which exhibited m-X separation performance similar to that of small membrane coupons. The present work provided a potentially scalable method for producing high-quality silicalite-1/PVA composite membrane for enhancing the pervaporation separation performance of m-X from xylene isomers.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 25
·16131-16140
·
IF 4.036
Qiu-Ping He,Ying-Ying Wang,Peng-Fei Wang,Xiao-Ming Dou
Zeolite–polymer composite membranes have become promising and effective materials for the pervaporative separation of liquids, especially for isomeric mixtures. In this paper, silicalite-1/PDMS composite membranes have been used to investigate the separation of dichlorobenzene (DCB) isomers via pervaporation for the first time. Silicalite-1 zeolites modified by the silane coupling agent, NH3–C3H6–Si(OC2H5)3, have been incorporated into polydimethylsiloxane (PDMS). Then, the silicalite-1/PDMS composite membranes have been successfully prepared on porous polyvinylidene fluoride (PVDF) supports. The morphology and structure of the silicalite-1 zeolites and silicalite-1/PDMS composite membranes have been characterized by XRD, FTIR, SEM and BET techniques. The results show that the modified silicalite-1 zeolite particles have smaller pore sizes dispersed more uniformly in the active layers of the silicalite-1/PDMS composite membranes and present fewer aggregation and pinholes formed by the accumulation of zeolite particles. The silicalite-1/PDMS composite membranes are all dense and continuous with good homogeneity. To evaluate the pervaporative separation performance of the DCB isomers, the unmodified and modified silicalite-1/PDMS composite membranes have been further tested in single-isomer and binary-isomer systems at 60 °C. The modified silicalite-1/PDMS composite membranes present higher DCB isomer separation factors. The separation factors of the modified silicalite-1/PDMS composite membranes in the binary-isomer systems for p-/o-DCB and p-/m-DCB are 3.53 and 5.63, respectively. The permeate flux of p-DCB through the modified silicalite-1/PDMS composite membranes in the p-/o-DCB binary-isomer system is 116.7 g m−2 h−1 and in the p-/m-DCB binary-isomer system, it is 93.5 g m−2 h−1. The result provides a new approach towards the pervaporative separation of DCB isomers from their mixture for future industrialization applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Haipeng Zhu,Renhao Li,Guozhen Liu,Yang Pan,Jiahui Li,Zhenggang Wang,Yanan Guo,Gongping Liu,Wanqin Jin
Pervaporation shows great potential in separation of organic-organic mixtures that are widely involved in chemical and petrochemical industries, while the separation performance of polymeric membranes is undesirable for practical application. In this work, we incorporated UiO-66 (ZrCl 4 ) metal-organic frameworks (MOFs) into chitosan (CS) membrane to separate methanol-dimethyl carbonate (DMC) mixtures. ZrOCl 2 ·8H 2 O or ZrCl 4 was selected as metal precursor to synthesize UiO-66, which aimed to investigate the structural defect of UiO-66 for the separation performance of mixed matrix membranes (MMMs). BET, 1 H NMR and low-angle XRD characterizations indicated that UiO-66 (ZrCl 4 ) with appropriate pore size is more suitable for preferentially permeate methanol over DMC. IR, dielectric relaxation and DSC characterizations combined with molecular simulations revealed the ideal interfacial morphology of UiO-66/CS MMMs was owing to the favorable molecular interactions including hydrogen bond interaction and van der Waals interaction. Pervaporation separation of methanol-DMC mixtures demonstrated that UiO-66 (ZrCl 4 ) nanofillers can simultaneously enhance the permeation flux and separation factor of CS membrane. The optimized 10 wt% UiO-66 (ZrCl 4 )/CS MMM exhibited total flux and methanol/DMC separation factor of 355 g/m 2 h and 337 for 10 wt% methanol-DMC mixtures at 50 °C, which were 3.4-fold and 25-fold higher than that of the pure CS membrane, respectively, and outperformed the state-of-the-arts polymer-based membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Song Liu,Guozhen Liu,Bojie Zhao,Yingxuan Deng,Haipeng Zhu,Gongping Liu,Wanqin Jin
The separation of small molecular organic-organic mixtures by membranes show considerable potential in energy efficiency, while the performance of polymeric membranes is unattractive. Two-dimensional (2D) graphene oxide (GO) membranes having ultra-fast and selective molecular transport channels could be an ideal platform for separating the organic-organic mixtures, however, such potential is not fully explored. In this paper, towards pervaporation separation of methanol (MeOH)/dimethyl carbonate (DMC) solvents, GO membrane with tunable interlayer and stable structure was prepared by anchoring metal ions between GO sheets. The introduced cations formed cation-π interaction with the sp 2 region of GO, and electrostatic attraction with carboxyl, hydroxyl and epoxy groups on GO sheets. The molecular transport channels of GO membrane was optimized by optimizing the cation species (Na + , K + , Zn 2+ , Ca 2+ ), cation content and GO flake sizes. The total flux of GO-Zn 2+ membrane is 707.3 g/(m 2 ·h) as well as separation factor is 61.9 for separation of 10 wt% MeOH/DMC mixtures by pervaporation at 50 °C. Meanwhile, the cationic control highly enhanced the stability of the GO membrane during continuous pervaporation process. This work reveals that GO membranes are the feasible for the application in pervaporation separation of organic-organic mixtures.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yaqi Wang,Tanlong Xue,Zhihao Si,Chang Liu,Shuai Yang,Guozhen Li,Yan Zhuang,Peiyong Qin
Recently, the preparation of polymeric membranes by UV-induced polymerization is encouraged due to the ultrafast curing and controllable operation. However, the long-period exposure under UV light has a great threat to both the environment and operators. Herein, we developed the visible-light-induced polymerized PDMS membrane for the pervaporative separation of furfural . The differences among photoinitiator ethyl(2,4,6-trimethylbenzoyl)phenylphosphinate (TPO-L), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) and 2-hydroxy-2-methylpropiophenone (1173) in the polymerization kinetics , membrane structure and separation performance are compared. Results show that the absorbance of TPO-L matches 405 nm of the visible light region; and it can be well dispersed and compatible with PDMS and obtain high initiation efficiency. Furthermore, the conditions including TPO-L concentration and PDMS viscosity are optimized, and the prepared membrane has an outstanding pervaporation performance containing 1299.5 g m −2 h −1 of total flux and 40.2 of furfural separation factor. Importantly, the ultrafast and continuous preparation process of membrane is operated by a home-made machine, indicating the wonderful potential for its large-scale application.
研究领域:
材料科学
·
化学工程
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）