Pervaporation of Aqueous Solution of Acetaldehyde Through ZSM-5 Filled PDMS Composite Membrane

Huifen, Tan; Li, Dongming; Yuan, Junfei

doi:10.1016/s1004-9541(11)60227-9

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…The introduced ZSM-5 was effectively embedded within the PDMS phase, without any noticeable aggregation, unlike other modified MMMs where some ZSM-5 particles tended to agglomerate. As a result of the long n-octyl chain on the surface of OTES@ZSM-5 particles entangling with the PDMS chain, the zeolite particles interact more strongly with the polymer [19,31]. Figure 9 shows the water contact angles of different modified MMMs.…”

Section: Characterization and Pv Performance Of The Mmmsmentioning

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: Characterization and Pv Performance Of The Mmmsmentioning

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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“…Pattabhi Ramaiah prepared ZSM−5 zeolites loaded PDMS hybrid membranes consisting of three hydrophobic layers for the removal of hazardous chlorinated VOCs from aqueous solutions [58]. Wu et al synthesized ZSM−5/PDMS hybrid membranes for pervaporation separation of acetaldehyde from aqueous solutions [59]. Banihashemi et al prepared ZSM−5/PDMS hybrid membranes by nanosized silicalite-1 zeolites powders for separation of CO 2 from CO 2 /CH 4 or CO 2 /N 2 system [60].…”

Section: Introductionmentioning

confidence: 99%

Silicalite-1/PDMS Hybrid Membranes on Porous PVDF Supports: Preparation, Structure and Pervaporation Separation of Dichlorobenzene Isomers

Chen

Wang

et al. 2022

Polymers

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Separation of dichlorobenzene (DCB) isomers with high purity by time− and energy−saving methods from their mixtures is still a great challenge in the fine chemical industry. Herein, silicalite-1 zeolites/polydimethylsiloxane (PDMS) hybrid membranes (silicalite-1/PDMS) have been successfully fabricated on the porous polyvinylidene fluoride (PVDF) supports to first investigate the pervaporation separation properties of DCB isomers. The morphology and structure of the silicalite-1 zeolites and the silicalite-1/PDMS/PVDF hybrid membranes were characterized by XRD, FTIR, SEM and BET. The results showed that the active silicalite-1/PDMS layers were dense and continuous without any longitudinal cracks and other defects with the silicalite-1 zeolites content no more than 10%. When the silicalite-1 zeolites content exceeded 10%, the surfaces of the active silicalite-1/PDMS layers became rougher, and silicalite-1 zeolites aggregated to form pile pores. The pervaporation experiments both in single-isomer and binary−isomer systems for the separation of DCB isomers was further carried out at 60 °C. The results showed that the silicalite-1/PDMS/PVDF hybrid membranes with 10% silicalite-1 zeolites content had better DCB selective separation performance than the silicalite-1/α−Al2O3 membranes prepared by template method. The permeate fluxes of the DCB isomers increased in the order of m−DCB < o−DCB < p−DCB both in single-isomer and binary-isomers solutions for the silicalite-1/PDMS/PVDF hybrid membranes. The separation factor of the silicalite-1/PDMS/PVDF hybrid membranes for p/o−DCB was 2.9 and for p/m−DCB was 4.6 in binary system. The permeate fluxes of the silicalite-1/PDMS/PVDF hybrid membranes for p−DCB in p/o−DCB and p/m−DCB binary−isomers solutions were 126.2 g∙m−2∙h−1 and 104.3 g∙m−2∙h−1, respectively. The thickness−normalized pervaporation separation index in p/o−DCB binary−isomers solutions was 4.20 μm∙kg∙m−2∙h−1 and in p/m−DCB binary−isomers solutions was 6.57 μm∙kg∙m−2∙h−1. The results demonstrated that the silicalite-1/PDMS/PVDF hybrid membranes had great potential for pervaporation separation of DCB from their mixtures.

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“…87 Formaldehyde is the oxidation product of methanol, while ethanol is converted to acetaldehyde; as formaldehyde is more toxic compared to acetaldehyde, 88 ethanol is the preferred substrate. It was shown that acetaldehyde can be easily separated by pervaporation 89 or air stripping. 90 Using AOX instead of GOX and ethanol instead of glucose for the in situ generation of H2O2 would avoid complex downstream processing.…”

Section: Oxidases-haloperoxidases Cascadementioning

confidence: 99%

Nitrogen containing biobased chemicals produced using enzymes

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AA Amino acid hSer homoSerine Aaa α-aminoadipic acid hSerCN Hydroxypropionitrile AaaCN 4-cyanobutanoic acid Km Michaelis constant Aba α-aminobutanoic acid Maa β-methyl aspartic acid AbaCN propionitrile MCD Monochlorodimedone ABTS 2,2′-azino-bis(3-ethylbenzo thiazoline-6-sulfonic acid) Me,-CH3 MeAsp Methyl group Aspartic acid β-methyl ester AOX Alcohol oxidase MeAspCN Methyl 2-cyanoacetate Asp Aspartic acid MeGlu Glutamic acid γ-methyl ester AspCN 2-cyanopropanoic acid MeGluCN Methyl 3-cyanopropanoate Br Bromine N Nitrogen C Carbon Na Sodium ca. circa NaBr Sodium bromide Cl Chlorine NaCl Sodium chloride CN Nitrile, nitrile functionality short term these measures are reducing the amount of single-use plastics to a certain extent. On the long term, it creates awareness among the users, 3 and it allows the development and marketing of alternatives such as compostable plastics. 4 However, behind the scenes issues related to plastics, and to chemicals in general, are not solved by the phasing-out measures. These behind the scenes issues relate to the way chemicals are produced. While the use of chemicals facilitates and simplifies our lives, their production from fossil resources and their use have unforeseen consequences such as pollution, geopolitical tensions, and climate change. 5 2014. 16 However, about half of the GHG emissions of the energy sector is actually generated due to the energy consumption in the industrial sector. This makes the industrial sector the major producer of GHG with 32% (21% + 11%). Therefore, it is sensible that mitigation strategies in the industrial sector will be the most beneficial against global warming. These mitigation strategies require the reduction of GHG and the enhancement of sinks for GHG by the development of sustainable processes. A classic example for a drop-in chemical is the production of ethylene 22 from biomass derived ethanol. The production of bioethanol used as fuel initiated the food vs fuel debate 23 which concerns the diversion of farmland for biofuels production to the detriment of the food supply. However, in the context of a sustainable economy, each component of biomass would be used at its highest value satisfying the need for both food and chemicals. 1.2.2 Biobased chemicals All organisms are genetically programmed to grow and develop to pass along their genes. For this, the organism must synthesise highly specialised components starting from simple 1.2.3 Nitrogen in nature, agriculture and industry Nitrogen is an essential element for living organisms as it is part of proteins, DNA, RNA, coenzymes (e.g. nicotine amide dinucleotide), etc. but also for the production of chemicals with special properties, e.g. ABS. Remarkably, ~78% of our atmosphere is composed of N2, however, this is an inert gas and only some organisms (bacteria and archaea) can make direct use of it by nitrogen fixation. 36 Nitrogen fixation in nature is done with the help of nitrogenases. 36 Nitrogenases are metalloenzymes (Fe-Mo or Fe-V) able to bind N2 and convert it to ammonium salts whi...

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Pervaporation of Aqueous Solution of Acetaldehyde Through ZSM-5 Filled PDMS Composite Membrane

Cited by 13 publications

References 18 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

Silicalite-1/PDMS Hybrid Membranes on Porous PVDF Supports: Preparation, Structure and Pervaporation Separation of Dichlorobenzene Isomers

Nitrogen containing biobased chemicals produced using enzymes

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