CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Xi Zhang,Xiaodong Wang,Wei Huang
In industry, ethylene (C 2 H 4 )/propylene (C 3 H 6 ) separations are usually performed by a cryogenic process, which is energy intensive. Membrane separation technology is an alternative separation process that saves energy and is efficient. In this study, blend membranes were prepared by doping polyethylene glycol (PEG600) into a poly(ether-block-amide) (Pebax® 2533) matrix and were used to separate the C 2 H 4 /C 3 H 6 mixture. The PEG 600 and Pebax® 2533 polymers have good compatibility because they share hydrogen bonds. The addition of PEG600 is conducive to the hydrophilicity and the free volume of blend membranes, and it is also conducive to the solubility of C 2 H 4 and C 3 H 6 in the membranes, which improves the ability of the membranes to separate this gas pair. The Pebax® 2533/PEG600 blend membrane with 15% (mass) PEG600 showed the highest separation performance in our investigated membranes, with a C 3 H 6 /C 2 H 4 selectivity of 8.9 and a C 3 H 6 permeability of 196 barrer (1 barrer = 1.33 × 10 14 m 3 (STP)·m·m −2 ·s −1 ·kPa −1 ) at 238 K and 0.2 MPa, which is higher than that of the Pebax® 2533/NaY-6% (mass) membrane ( α C 3 H 6 /C 2 H 4 =6.5, P C 3 H 6 =211 barrer) reported in our previous work. It is confirmed that incorporating PEG600 into the Pebax® 2533 matrix to fabricate blend membranes is an efficient strategy for separating light olefins .
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Bingbing Yang,Lu Bai,Zhenlei Wang,Haiyan Jiang,Shaojuan Zeng,Xiaochun Zhang,Xiangping Zhang
Ammonia (NH3) separation and recovery from NH3-containing gases favor resource utilization and ecological protection. Ionic liquids (ILs) are promising alternatives to fabricate polymer-based hybrid membranes with excellent and tunable properties. Herein, [Eim][NTf2] and [Emim][NTf2], with different hydrogen bond donating abilities and viscosities, were used to tailor NH3 transport properties in the membranes for enhancing NH3 separation performance. Poly(ether-block-amide) (Pebax)/[Eim][NTf2] membranes exhibit superior NH3 permeability of 2118.7 Barrer with NH3/N2 and NH3/H2 selectivities of 467.0 and 127.2, respectively. NH3 solubility in Pebax/[Eim][NTf2] membranes increases significantly when increasing the IL content, while the solubility in Pebax/[Emim][NTf2] membranes is almost unchanged, mainly because the hydrogen bond interaction between NH3 and [Eim][NTf2] is stronger. NH3 diffusion in Pebax/[Eim][NTf2] membranes decreases when increasing the IL content, while the diffusion in Pebax/[Emim][NTf2] membranes exhibits the reverse trend, corresponding to NH3 diffusion properties in pure ILs. Therefore, NH3 solubility is the more dominant factor in improving NH3 permeability in the membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Ye Zhang,Zhongyi Jiang,Jing Song,Jian Song,Fusheng Pan,Peng Zhang,Xingzhong Cao
Polymeric dense membranes for separating molecules with similar properties in liquid mixture according to solution-diffusion mechanisms are often constrained by trade-off effects. Integrating a facilitated transport mechanism and a sieving mechanism into membranes is a preferred approach to address this issue. Herein, amine-functionalized titanium-based metal–organic frameworks (NH2-MIL-125(Ti)) immobilized with Ag+, Ag+@NH2-MIL-125(Ti), was synthesized and hybrid membranes were fabricated for pervaporative desulfurization. The immobilized Ag+ can form reversible π-complexation toward thiophene and achieve thiophene-selectivity transport via a facilitated transport mechanism; meanwhile, Ag+ can decrease the effective pore size of the MOFs to elevate the diffusion selectivity of thiophene via a sieving mechanism. Accordingly, the resulting Pebax membranes with 1.0 wt % Ag+@NH2-MIL-125(Ti) exhibit a permeation flux of 22.11 kg/(m2 h) and an enrichment factor of 5.92. Furthermore, the hybrid membranes display increased thermostability and antiswelling properties by the incorporation of Ag+@NH2-MIL-125(Ti). This study proposes a strategy for the rational design of MOFs as nanofillers and endow the membranes with superior separation performance by integrating multiple transport mechanisms.
研究领域:
材料科学
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分离技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Jiashuai Zhao,Jiating Liu,Yutong Wang,Jin Du,Ziting Zhu,Yuhan Wang,Junyi Zhao,Mengying Long,Fusheng Pan,Zhongyi Jiang
Hybrid membranes hold significant potential in the efficient recovery of aromatic volatile organic compounds (VOCs). The advanced fillers with high aromatics affinity and polymer compatibility are in urgent demand. In this study, covalent organic framework nanosheets (COFNs) were introduced into poly (ether block amide) (Pebax®2533) to fabricate hybrid membranes. The long-range ordered pore structure, tunable functional groups and organic attributes of COFNs enhanced the affinity of membrane towards aromatic VOCs, the transport of VOCs within the membrane as well as the interactions between COFNs and Pebax. The hybrid membrane filled with TpPa-COOH COFNs exhibited a noticeable improvement in both selectivity and permeability compared to pure Pebax membranes. Particularly, when the content of TpPa-COOH COFNs was at 4 wt%, the membrane demonstrated excellent separation performance for a 2.7 mol% toluene/N 2 mixture, wherein the toluene permeability of membrane was 6.7 × 10 −7 mol μm m −2 s −1 Pa −1 and the selectivity was 674. This study expanded the application scenarios of COFs-based hybrid membranes and provided a new approach for the design and fabrication of VOCs recovery membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Wenji Zheng,Rui Ding,Kai Yang,Yan Dai,Xiaoming Yan,Gaohong He
Poly (ether- block -amide) (Pebax) based mixed matrix membranes (MMMs) were prepared by using size-tunable ZIF-8 nanoparticles as fillers. ZIF-8 nanoparticles with sizes of 40, 60, 90 and 110 nm (ZIF-8-40, ZIF-8-60, ZIF-8-90 and ZIF-8-110) were synthesized in microemulsion by controlling the ratio of Zn 2+ to Hmim (1:16, 1:8, 1:5, 1:2). And they were distributed uniformly in Pebax matrix without obvious agglomerations and defects at the loading of 0–20 wt.%, which was confirmed by field-emission scanning electron microscopy (FE-SEM). The incorporation of ZIF-8 resulted in a significant improvement in CO 2 permeability and the CO 2 /N 2 selectivity increased with the BET surface area of ZIF-8 increasing. The enhanced permeability is attributed to an improvement in the free volume of the polymer induced by larger sized ZIF-8, while the increased selectivity results from the high specific surface area of large sized ZIF-8, which can provide more active sites for CO 2 capture and great mass transfer resistance for N 2 . At 5 wt.% loading of ZIF-8-90, the MMM presents the best separation performance with CO 2 permeability of 99.7 Barrer and CO 2 /N 2 selectivity of 59.6, both of which are increased by about 25% by comparison to the pure Pebax membrane. The present study provides an effective way to obtain size-controlled ZIF-8 fillers and high separation performances of Pebax based MMMs.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2025
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IF 4.7
Yanling Liu,Xiao Peng,Yuan Li,Fei Wang,Xue Ai,Yuxi Huang,Xin Sun,Jie Zhao,Kai Li
Membrane separation technology has garnered significant attention for CO2 separation and purification, with mixed matrix membranes (MMMs) emerging as promising candidates due to their advantages of ease of processing, high mechanical strength, and thermal stability. The development of effective fillers for separation performance becomes one of the key foci in this area. In this work, CC3, a type of porous organic cages (POCs), was synthesized and functionalized with two amino-containing materials of different chain lengths. Polyethylenimine (PEI) and diethylenetriamine were used as modification agents to successfully graft amino groups onto the CC3 crystals to form defect-free Pebax mixed matrix membranes containing amino-functionalized CC3. The special porous structure of CC3 increases the gas permeability of the mixed matrix membrane by providing extra channels for the transportation of CO2. Besides, amino groups on functionalized CC3 interact with the chains of Pebax through hydrogen bonding, thus improving the compatibility between filler and matrix. The amino groups can further facilitate the transport of gases across the membrane through reversible reactions with CO2, which is further enhanced under humid conditions. Under optimal conditions, at 1 bar and 30 °C, the CO2 permeability of Pebax/PEI@CC3-MMMs was 342.33 Barrer with a selectivity of 33.38, while Pebax/DETA@CC3-MMMs exhibited a CO2 permeability of 273.34 Barrer and a selectivity of 35.77. This work demonstrates that amino-functionalized POCs (CC3) can effectively enhance the CO2 permeability and the CO2/N2 selectivity, which may provide a way to develop high-performance mixed matrix membranes with superior separation properties.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Yanyong Sun,Minmin Gou
Based on the one-dimensional tubular structure of halloysite nanotubes (HNTs), plant polyphenols and polyamines were used for in situ polymerization on the surface of HNTs to form amino-rich polymers, which were then removed as templates to synthesize polymer nanotubes. These nanotubes were then incorporated into a Pebax matrix to prepare mixed-matrix membranes (MMMs) for CO 2 /CH 4 gas separation. The removal of the HNT template increased the lumen diameter of the filler and significantly improved its gas permeability . And the amino groups on the inner surface of the polymer nanotubes were exposed. Further, the number of CO 2 reaction sites increased, which improved the reaction selectivity of CO 2 . In addition, the presence of amine groups on the inner and outer surfaces of the polymer nanotubes provided various transfer channels for CO 2 , which were conducive for CO 2 gas transfer in the membrane. When the CC-PEINT content was 8 wt%, the CO 2 permeability was 710 Barrer and CO 2 /CH 4 selectivity was 60. The CO 2 permeability and CO 2 /CH 4 selectivity of the Pebax/CC-PEINTs membranes increased by 163% and 132%, respectively, compared with those of the pure Pebax membrane.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Jie Gao,Haizhuo Mao,Hua Jin,Chen Chen,Armin Feldhoff,Yanshuo Li
Membrane-based separation technology has evolved as a competitive approach for CO 2 capture from flue gas (mainly N 2 ). To achieve high separation performance, three partially NH 2 -, OH- and CH 3 OH- functionalized mixed-linker-ZIF-7 were successfully synthesized, and incorporated into polyether-block-amide (Pebax® 2533) polymer to form mixed-matrix membranes (MMMs). As evidenced by the CO 2 adsorption isotherms , introducing functional groups in the ZIF-7 framework was indeed beneficial for CO 2 adsorption. All MMMs composed of ZIF-7-NH 2 , ZIF-7-OH and ZIF-7-CH 3 OH offered better CO 2 /N 2 separation performance than the parent ZIF-7-Pebax® 2533 membrane, suggesting the positive effect of functionalized ZIF-7 fillers on the gas separation performance. Among the three functionalized ZIF-7 based MMMs, the ZIF-7-OH-Pebax MMMs exhibited the best performance for CO 2 /N 2 separation, which might be ascribed to the highest adsorption selectivity of CO 2 over N 2 predicted by ideal adsorbed solution theory (IAST) for ZIF-7-OH fillers. The 14% ZIF-7-OH-Pebax MMM showed high CO 2 permeability of 273 Barrer and CO 2 /N 2 separation factor of 38, which increased by 60% and 145% as compared with the neat Pebax membrane. The strategy of preparing functionalized MOFs with strong affinity for CO 2 provides an effective method to develop MMMs for highly efficient CO 2 separation.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 134
·期 10
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IF 1.866
Yuanyuan Liu,Xueqin Li,Yun Qin,Ruili Guo,Jianshu Zhang
Novel facilitated-transport mixed-matrix membrane (MMM) were prepared through the incorporation of polydopamine (PDA) microspheres into a poly(amide- b -ethylene oxide) (Pebax MH 1657) matrix to separate CO 2 –CH 4 gas mixtures. The Pebax–PDA microsphere MMMs were characterized by Fourier transform infrared spectroscopy, scanning electron microcopy, X-ray diffraction, differential scanning calorimetry, and thermogravimetric analysis. The PDA microspheres acted as an adhesive filler and generated strong interfacial interactions with the polymer matrix; this generated a polymer chain rigidification region near the polymer–filler interface. Polymer chain rigidification usually results in a larger resistance to the transport of gas with a larger molecular diameter and a higher CO 2 –CH 4 selectivity. In addition, the surface of PDA microspheres contained larger numbers of amine, imine, and catechol groups; these were beneficial to the improvement of the CO 2 separation performance. Compared with the pristine Pebax membrane, the MMM with a 5 wt % PDA microsphere loading displayed a higher gas permeability and selectivity; their CO 2 permeability and CO 2 –CH 4 selectivity were increased by 61 and 60%, respectively, and surpassed the 2008 Robeson upper bound line. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44564.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
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2025
·
IF 4
Zhang Chengpeng,Bei Pengzhi,Liu Hongjing,Zhao Xu,Shi Meiling,Jing Xiaochun,Li Zhao,Yao Hui
A novel porous liquid, M2070-UiO-66-OH@[BMim][PF 6 ], has been synthesized using zirconium-based metal–organic framework (UiO-66-OH), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMim][PF 6 ]) and polyetheramine M2070. To enhance the CO 2 separation performance, M2070-UiO-66-OH@[BMim][PF 6 ] was incorporated as a filler into a mixed matrix membrane (MMM) using polyether block amide (Pebax-1657) as the membrane matrix. The properties of the synthesized M2070-UiO-66-OH@[BMim][PF 6 ] and the resulting MMMs have been characterized through FTIR, TGA, DSC, and SEM analyses. The results of porous liquid stability revealed that grafting polyetheramine M2070 onto the surface of UiO-66-OH@[BMim][PF 6 ] significantly increased the steric hindrance, thereby preventing agglomeration within the membrane. Additionally, the functional groups (amino and ether) present in M2070-UiO-66-OH@[BMim][PF 6 ] contributed to an increased number of active sites for CO 2 adsorption, facilitating enhanced CO 2 transport through the membrane. Compared to the Pebax membrane, the MMM containing 3% M2070-UiO-66-OH@[BMim][PF 6 ] exhibited significantly improved CO 2 permeability of 104.07 Barrer (an increase of 73.22%) and CO 2 /N 2 selectivity of 92.37 (an increase of 148.95%) at 30 °C and 0.3 MPa, surpassing the 2008 Robeson upper bound. These findings suggest that M2070-UiO-66-OH@[BMim][PF 6 ] is a highly promising additive for the fabrication of mixed matrix membranes with superior CO 2 separation performance. Graphical abstract A porous liquid, (M2070-UiO-66-OH@[BMim][PF 6 ]) has been prepared using UiO-66-OH@[BMim][PF 6 ] as the core and polyetheramine M2070 as the canopy. Afterwards, M2070-UiO-66-OH@[BMim][PF 6 ] has been added to the Pebax matrix to prepare M2070-UiO-66-OH@[BMim][PF 6 ]/Pebax mixed matrix membranes, which have been subjected to gas separation studies.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Ning Zhang,Dongdong Peng,Hong Wu,Yanxiong Ren,Leixin Yang,Xingyu Wu,Yingzhen Wu,Zihan Qu,Zhongyi Jiang,Xingzhong Cao
For high-performance hybrid membranes, it is crucial to design multi-functional filler to rationally manipulate the structure-property relationship. In this study, a novel kind of hybrid membrane was fabricated by incorporating zinc ion loaded sulfonated pitch (SP-Zn 2+ ) nanofillers into poly (ether-block-amide) (Pebax) matrix for CO 2 /CH 4 separation. Sulfonated pitch (SP) with high sulfonate content was functionalized by zinc ion (Zn 2+ ) via complexation reaction to synthesize SP-Zn 2+ nanofillers with high Zn 2+ loading. Mixed gas separation performances of membranes with different SP-Zn 2+ loading were conducted. Meanwhile, the effect of operating pressure on separation performance and long-term operation stability were investigated. The hybrid membranes displayed significantly enhanced permeability and CO 2 /CH 4 selectivity. First, the hydrophilic sulfonate group in SP had good compatibility with Pebax matrix and effectively suppressed interfacial defects. Second, zinc ions and sulfonate group could form zinc-sulfonate complex network. The sulfonated moiety afforded strong affinity toward CO 2 due to multiple interactions whereas the Zn 2+ moiety afforded a transport highway for CO 2 . Third, the incorporation of SP-Zn 2+ nanofillers could disturb the Pebax chain packing and optimize the free volume characteristics. Particularly, Pebax/SP-Zn 2+ (2) membrane exhibited an increment of 104% and 70.2% in CO 2 permeability and CO 2 /CH 4 selectivity respectively, much higher than that of Pebax membrane.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yonghong Wang,Zhiwei Ma,Xinru Zhang,Jinping Li,Yi Zhou,Zhuo Jin,Nanwen Li
Fabricating high-performance mixed matrix membranes (MMMs) for CO 2 separation is of great importance for industrial application, but the poor compatibility between polymer and filler hinders their further development. Herein, novel nitrogen-doped porous carbons (NPC) were gained by a facile hydrothermal reaction between glucose and melamine , subsequently KOH activation. Highly micropore NPC with the BET surface area of 1229.36 m 2 g −1 and Langmuir surface area of 1868.46 m 2 g −1 accompanied with the BJH pore volume of 0.68 cm 3 g −1 was achieved by scanning electron microscopy (SEM) and N 2 adsorption. After blending with polyether-block-amide (Pebax), the as-obtained MMMs showed excellent mechanical properties probably due to the homogeneous dispersion of NPC in the Pebax as shown in SEM results. The nitrogen in MMMs was expected to be significantly increased upon incorporation with NPC, as verified by attenuated total reflectance Fourier-transform infrared spectroscopy, thus increased the CO 2 transport. MMM with 5 wt% NPC exhibited a CO 2 permeability of 553 Barrer. This value is much higher than that of the pristine Pebax membrane. Surprisingly, a significantly improved CO 2 /N 2 selectivity of as high as 56.4 was observed for MMMs. Thus, MMM having a 5 wt% NPC had an excellent gas separation, approaching Robeson's upper bound revised in 2019, which was superior to the one incorporated with other activated carbons prepared from similar reactants. The enhanced separation performance is mainly ascribed to the presence of nitrogen-containing groups for high CO 2 affinity and also the micropore structure to promote CO 2 diffusion in NPC. These results indicated that the improvement in gas permeability and ideal selectivity simultaneously could be achieved by MMMs using the microporous and functional nanofillers .
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）