SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Wenlu Song,Kexin Feng,Xiuxiu Ren,Dongliang Jin,Meng Guo,Jing Zhong
The industrial synthesis of Methyl tert-butyl ether (MTBE) typically requires the addition of excess methanol (MeOH) for catalytic reaction. However, the efficient separation of pure MTBE from MeOH/MTBE azeotropic mixtures has remained a research focus in this field. Membrane based separation technology has shown high promise in the purification of organic solvents. Herein, 1,2-bis(triethoxysilyl)ethane (BTESE) derived organosilica membranes with different sub-nanopore structures were fabricated by modulating the acidic/alkaline environment during the sol-preparation process. The sol sizes and the resultant membrane structure were precisely tailored by adjusting the acidic and alkaline environment within the organosilica sols. The resulting materials synthesized via sole acid catalysis, acid-base two-step catalysis, and acid-base-acid three-step catalysis were designated as BTESE-A, BTESE-AB, and BTESE-ABA, respectively. A series of characterization were adopted for probing the networks from the perspectives of sol particle size, functional group and segment cross-linking structure. The separation performance of these membranes for MeOH/MTBE mixtures was systematically investigated. BTESE membranes fabricated under different sols exhibit distinct separation performance. Investigation revealed that altering the catalytic conditions during sol preparation effectively modulates the sol size, thereby influencing the separation performance of the resulting pervaporation membranes. The permeation flux of BTESE-A, BTESE-AB, and BTESE-ABA membranes were 1048.8, 1543.8, and 1482.1 g·m −2 ·h −1 , and the MeOH concentration in permeated side was 99.95%, 96.43% and 99.58%, respectively, for MeOH/MTBE mixtures (15/85) at 40 °C. Notably, compared with the BTESE-A and BTESE-AB membranes, the BTESE-ABA membrane exhibits superior permeation flux and separation factor, making it the optimal choice for MeOH/MTBE separation. More importantly, BTESE-ABA membrane also shows high promise in MeOH/other organic solvents separations. This study provides theoretical guidance for the regulation of sol sizes and offers a more effective separation strategy for the efficient separation of organic solvents mixtures.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Fengkai Wang,Mengxin Shen,Zhangan Li,Yating Zhu,Jie Li,Naixin Wang,Hong Meng,Quan-Fu An
The use of pervaporation membranes has shown great potential in the extraction of bioethanol . However, a simple, continuous, and controllable alcohol perm-selective membrane manufacturing process is needed for practical applications. In this study, the slot-die coating technique was utilized to deposit low-viscosity vinyl-polydimethylsiloxane (vinyl-PDMS) and crosslinker onto a porous substrate . A defect-free separation layer could be created within just 20 min, which includes the membrane forming and drying process, due to the rapid hydrosilylation reaction between vinyl-PDMS and the crosslinker. Therefore, the efficient fabrication process is suitable for continuous roll-to-roll industrial production. Additionally, by optimizing the slot-die parameters, the thickness of the separation layer could be regulated from 0.4 to 15 μm. The obtained vinyl-PDMS composite membrane demonstrated a total flux of 2.8 kg m −2 h −1 and a separation factor of 10.3 for 5 wt% ethanol/water mixture at 60 °C.
研究领域:
材料科学
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化学工程
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Peng Liu,Mengmeng Chen,Yiqiang Ma,Chuan Hu,Qiugen Zhang,Aimei Zhu,Qinglin Liu
Pervaporation is a promising membrane technology for separation of aqueous organic solution particularly azeotrope and close-boiling point compounds. However, most of pervaporation membranes are based on hydrophilic polymers that suffer decline of separation performance due to their swelling in aqueous solution. Here we present a copolymer synthetic strategy for preparation of hydrophobic polymer pervaporation membrane with hierarchical porosity via uniting both rigid and flexible segments. The synthesized membrane has well-defined micropores and high free volume faction of 8.03% with cavity size of 0.476 nm, and demonstrate exceptional performance with high permeability and selectivity for dehydration of alcohols. In the pervaporation of ethanol-water azeotrope, the membrane displays the high permeabtion flux of 74.6 μm kg m −2 h −1 and water selectivity of 34 (separation factor of 732) at 30 °C. The developed strategy has excellent potential for synthesizing copolymers for high-efficient pervaporation membranes.
研究领域:
化学工程
·
材料科学
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高影响因子
DESALINATION
·
2026
·
IF 9.8
Zilin Pan,Feng Ye,Shuanshi Fan,Yanhong Wang,Xuemei Lang,Lisha Lu,Gang Li
LiBr-H₂O absorption chillers offer significant advantages in cooling applications; however, their widespread implementation has been severely limited by their large weight and size. The miniaturization of their key components is therefore critical to expanding their practical applications. This study presents a novel desorber design that employs a pervaporation process to concentrate LiBr solutions using DDR zeolite membranes. High-quality DDR zeolite membranes were fabricated via a heteroepitaxial growth process, utilizing CHA rather than DDR zeolite seeds, owing to the successful suppression of the SGT competitive phase during membrane synthesis. The resulting DDR zeolite membrane exhibited a water flux ranging from 0.16 to 1.56 kg·m −2 ·h −1 and a LiBr rejection exceeding 99.9 % for 20–60 wt% LiBr solutions at temperatures of 20–80 °C. The activation energy for water permeation decreased from 20.64 to 9.69 kJ·mol −1 as the LiBr concentration increased from 20 to 60 wt%, which stemmed primarily from the combined effect of the thermodynamic properties of LiBr solutions and the adsorption behaviors of the membrane. Moreover, the DDR zeolite membrane demonstrated excellent stability in the pervaporation dehydration of LiBr solutions, even at 80 °C, highlighting its potential for use in desorbers for LiBr-H₂O absorption chillers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 17
·46159
·
IF 1.901
Sheng Xu,Liang Shen,Cailian Li,Yan Wang
In this work, three dianhydrides with similar chemical structures, 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), 4,4′-oxydiphthalic anhydride (ODPA), and pyromellitic dianhydride (PMDA), are employed for the crosslinking modification of poly(vinyl alcohol) (PVA) membranes for ethanol dehydration via pervaporation. The changes in crosslinking degree, surface hydrophilicity, and glass-transition temperature are investigated and compared. Compared to the pure PVA membrane, all crosslinked membranes show higher fluxes but lower separation factors, because of the higher fractional free volume and the lower hydrophilicity by the crosslinking of the PVA matrix, respectively. In addition, all crosslinked PVA membranes exhibit similar flux, and the separation factor presents a decreasing order of PVA/PMDA-2 > PVA/ODPA-2 > PVA/BTDA-2, which is in the reverse order of their hydrophilicity, probably because of the reduction in the swelling resistance. With the PMDA content increasing from 0.01 to 0.04 mol/(kg PVA) in the PVA/PMDA crosslinked membranes, the crosslinking degree is enhanced and the hydrogen bonding is weakened, resulting in a flux increase from 120.2 to 190.8 g m −2 h −1 , but the separation factor declines from 306 to 58. This work is believed to provide useful insight on the chemical modification of PVA membranes for pervaporation and other membrane-based separation applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46159.
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
JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Hua-Yu Zhang,Jiu-Li Wen,Qi Shao,Ai Yuan,Hai-Ting Ren,Fang-Ying Luo,Xiao-Liang Zhang
La/Y-codoped microporous organosilica membranes were successfully fabricated by sol-gel procedure with 1,2-bis(triethoxysilyl)ethane (BTESE) as silica precursor for efficient desalination. The rare earth elements were confirmed to be doped into silica frameworks during the sol-gel procedure by various characterizations, which would decrease particles size and size distribution of BTESE-derived sols and form hydrothermally stable Si–O–RE (RE for La and Y) bonds. It could significantly influence membrane surface morphology , microstructure properties and hydrophilcity of La/Y-codoped membranes, and then improve their desalination performance. Under the optimized preparation conditions, La 25 Y 75 -SiO 2 (La:Y = 25:75, mol%) membranes exhibited the highest water flux of 10.3 kg m −2 h −1 and NaCl rejection of nearly 100% towards 3.5 wt% NaCl feed solution even at room temperature of 25 °C. It was attributed to strongest hydrophilcity, finest microstructure, and lowest mass resistance of water permeation for La 25 Y 75 -SiO 2 membranes. Moreover, such these organosilica membranes demonstrated good stability for 200 h simulated seawater desalination tests without any significant changes of separation performance and promising hydrothermal durability under various salts solutions with different concentrations at 25–60 °C.
研究领域:
材料科学
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环境工程
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高影响因子
COLLOID AND POLYMER SCIENCE
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2021
·Vol. 299
·期 9
·1459-1468
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IF 1.931
Guan Peiwen,Ren Cong,Shan Houchao,Cai Di,Zhao Peimian,Ma Dongze,Qin Peiyong,Li Shufeng,Si Zhihao
To meet the increasing requirements toward biobutanol, pervaporation membrane with high separation performance needs to be developed. In this work, a hydrophobic MAF-6 (RHO-[Zn(eim) 2 ]) was synthesized and its adsorption properties for 1-butanol was systematically studied, which are supposed to benefit the separation performance of polydimethylsiloxane (PDMS) membrane. The hydrophobic MAF-6 particles were therefore doped into PDMS to fabricate mixed matrix membrane. The morphology, chemical structure, and other properties of particles and hybrid membrane were fully studied by SEM, PXRD, FT-IR, TGA, and BET. Results demonstrate that the hydrophobicity of PDMS membrane is improved with the water contact angle increasing from 112.7° to 118.1° after being doped with MAF-6, as well as enhanced adsorption ability toward 1-butanol. More importantly, when doping MAF-6 into PDMS layer, the enhancements of 23.30% and 41.93% are separately observed in the separation factor and total flux to separate 1.5 wt% 1-butanol solution, compared with the PDMS membrane. In addition, the heat energy consumption of pervaporation process is decreased from 4.27 to 3.71 kJ g −1 via the doping of MAF-6. Overall, this work confirms that the hydrophobic particle such as MAF-6 is not only conductive to enhance the separation performance of PDMS membrane but also helpful to decrease the energy consumption.
研究领域:
材料科学
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化学工程
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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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
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材料科学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
·
IF 5.107
Yinhua Yang,Zhihao Si,Di Cai,Xingning Teng,Guozhen Li,Ze Wang,Shufeng Li,Peiyong Qin
A high hydrophobicity of membrane plays a vital role in separating organics from dilute solution by pervaporation, which highly contributes to the increase of organics selectivity. Herein, we chose the high-hydrophobic poly[(3,3,3-trifluoropropyl)methylsiloxane] (PTFPMS) material to prepare the pervaporation membrane using a green method for the first time. Within the PTFPMS membrane, the -Si-O- chains imply the hydrophobic nature, and introducing CF 3 groups further enhances the hydrophobicity. The high-efficiency transport pathways are formed in which water will experience a larger diffusion resistance within PTFPMS membrane compared with the conventional polydimethylsiloxane (PDMS) membrane without CF 3 groups. Moreover, considering the great threat of organic solvent to the environment and operators during membrane preparation, a green approach using water instead of organic solvent was employed. Especially, when separating 1 wt% furfural aqueous solution at 80 ℃, there are 30% of increase in the furfural separation factor (45.6) and an effective increase in furfural flux (328 g m −2 h −1 ) compared with those of PDMS membrane. Overall, the super-hydrophobic PTFPMS membrane highly improves the feasibility of the downstream processes for recovering the biomass derives furfural.
研究领域:
材料科学
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环境工程
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Gang Li,Shanhong Ma,Feng Ye,Yiwei Luo,Shuanshi Fan,Xuemei Lang,Yanhong Wang,Liang Zhou
The dehydration of bio-oil is of great importance for improving its heating value for application as a renewable transportation fuel, and a T-type zeolite membrane was proposed for bio-oil dehydration via pervaporation in the present study. The permeation results show that water could be highly selectively removed via pervaporation from bio-oil, but the membrane was easily fouled in bio-oil due to a complex composition, which led to a rapid decrease in the permeation flux. The flux of the fouled T-type zeolite membrane in bio-oil was effectively regenerated after calcination at 220 °C, and the T-type zeolite membrane showed excellent reusability and chemical stability in the bio-oil system. Insights into the transport behaviors demonstrate that water permeated through the membrane mainly via intercrystalline pores, while most intracrystalline pores were blocked during pervaporation due to the strong adsorption of organic components in the pores, which suggests that tailoring both the amount and size of intercrystalline pores in the membrane is of great significance to effectively enhance the bio-oil dehydration performance.
研究领域:
化学工程
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可再生能源
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材料科学
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 34
·17699-17709
·
IF 14.511
Zhihao Si,Chang Liu,Tanlong Xue,Shuai Yang,Yuhui Cui,Yaqi Wang,Di Cai,Peiyong Qin
Polymeric membranes are in great demand for biofuels, and ultraviolet (UV)-induced crosslinking currently shows a controllable and ultrafast ability for their fabrication, whereas the weak compatibility between the photoinitiator (PI) and polymer remains a great challenge in the large-scale supply of membranes. Herein, we report a polydimethylsiloxane (PDMS) prepolymer simultaneously functionalized with a PI and photocrosslinker, which endows the prepolymer with self-initiation and self-polymerization properties, respectively. The chemically grafted PI shows a stable and homogeneous distribution over 10 days with a superhigh loading (>5 wt%), which provides an extremely high initiation efficiency. Accordingly, the self-initiated/self-polymerized membranes exhibit an excellent comprehensive performance for bioethanol enrichment compared with the state-of-the-art polymeric membranes. Our PI–polymer design provides a general framework for the high-efficiency fabrication of polymeric membranes.
研究领域:
材料科学
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化学工程
·
生物技术
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yue Sun,Huhu Zhao,Heng Mao,Mengxue Duan,Kun Wang,Nanbin Bao,Zhi-Ping Zhao,Huanjun Li
Superhydrophobic mixed matrix membranes (SMMMs) are very desirable for efficient separation of biofuel recovery from the fermentation broth via pervaporation. In this work, hydrophobic silica hollow spheres (SHSs) were elaborately prepared by template method and subsequent silane modification. The resulting SHSs were incorporated into polydimethylsiloxane (PDMS) matrix to construct superhydrophobic SHSs/PDMS MMMs. The superhydrophobic composite membrane with 15 wt% SHS contents showed a water contact angle of up to 160°, with low sliding angle of less than 5°. As a result, for the permselective pervaporation of 1 wt% acetone aqueous solution at 35 °C, the optimized composite membrane with separation factor of 46 increased by 256%, and maintained a comparable total flux compared with the pure PDMS membrane. The slight decrease of the total flux was mainly attributed to the reduced water partial flux resulting from water repellency of the superhydrophobic membrane surface. Thus, our proposed strategy of constructing superhydrophobic composite membranes may provide new insights into the development of high-performance pervaporation membrane for biofuel recovery.
研究领域:
材料科学
·
化学工程
·
生物燃料技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）