Influence of feed flow rate, temperature and feed concentration on concentration polarization effects during separation of water-methyl acetate solutions with high permeable hydrophobic pervaporation PDMS membrane

Borisov, Ilya L.; Kujawska, Anna; Knozowska, Katarzyna; Volkov, V. V.; Kujawski, Wojciech

doi:10.1016/j.memsci.2018.07.001

Cited by 46 publications

(15 citation statements)

References 53 publications

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“…The data obtained from Figure a were also used to determine the diffusion selectivity with the half‐time method. The diffusion coefficients of methanol and methyl acetate in the PDMS membrane were calculated to be about 1.47 × 10 −9 m 2 /s and 4.87 × 10 −10 m 2 /s, respectively, consistent with other reports . Finally, the ideal selectivity of methyl acetate to methanol (about 4.31) was obtained, which also showed that the membrane had higher selectivity than in distillation (~3.29).…”

Section: Resultssupporting

confidence: 88%

Pervaporative separation of methyl acetate–methanol azeotropic mixture using high‐performance polydimethylsiloxane/ceramic composite membrane

Zong

Zhou

et al. 2019

Asia-Pacific J Chem Eng

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Methyl acetate is a very important green solvent, which is often produced by esterification using excess methanol as one of the reagents. Therefore, costefficient separation of the methyl acetate/methanol mixture is important. However, the formation of a methanol/methyl acetate azeotrope at atmospheric pressure results in high energy consumption for their separation using distillation such as extractive distillation. In order to reduce the energy consumption, pervaporation (PV) was used to replace the distillation in this study. Two membranes, polydimethylsiloxane and polyoctylmethylsiloxane, were first compared in the PV separation of the methyl acetate/methanol mixture. Then the effects of different operating parameters such as temperature, feed flow rate, permeate pressure, and so on were investigated. Total flux was up to 100 kg/(m 2 ·hr) at 50°C, whereas the separation factor ranges from 1.2 to 5.0.Results showed that the methyl acetate/methanol azeotrope could be broken in the studied concentration range and high flux could be obtained. Furthermore, the change of activation energy with feed methyl acetate concentration and membrane thickness with temperature was investigated. To demonstrate the potential of the industrial applications, the stability in separation of 32 wt.% methyl acetate-methanol mixtures for 15 days was investigated. ORCIDWanqin Jin https://orcid.org/0000-0001-8103-4883 FIGURE 15 Membrane stability in the PV of 32 wt.% methyl acetate-methanol mixture at 25°C FIGURE 14Effects of downstream pressure on separation factor and total flux at 20°C and a fixed flow rate of 1,000 ml/min 10 of 12 LI ET AL.

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Section: Resultssupporting

confidence: 88%

Pervaporative separation of methyl acetate–methanol azeotropic mixture using high‐performance polydimethylsiloxane/ceramic composite membrane

Zong

Zhou

et al. 2019

Asia-Pacific J Chem Eng

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“…Thus, as explained before, membrane fouling is prone to decrease the process driving force (due to temperature polarization effect). A more precise characterization of the temperature polarization effect could be performed by using tools allowing the in-situ characterization of the temperature fields in the membrane module [43] or by a theoretical approach [51] (requiring the use of Computational Fluid Dynamics (CFD) due to the highly complex geometry of the membrane module used). These aspects were thus out of the scope of this study.…”

Section: Process Performance and Membrane Fouling/wettingmentioning

confidence: 99%

Air-gap membrane distillation for the separation of bioethanol from algal-based fermentation broth

Loulergue

Balannec

Graët

et al. 2019

Separation and Purification Technology

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et al.. Air-gap membrane distillation for the separation of bioethanol from algal-based fermentation broth. Separation and Purification Technology, Elsevier, 2019, 213, pp. Abstract :More than 80 % of the energy consumed in the world comes from fossil fuels alone. However, fermentative production of bioethanol has recently gained a considerable interest as an alternative and renewable fuel. Among the different biomasses, the use of macro-algae hydrolysate as the fermentation substrate has been shown to be interesting. However, after fermentation, ethanol has to be separated from the complex broth containing numerous compounds such as microorganisms, fermentation co-products, non-fermentable organic matter, salts, etc. In this study, Air-Gap Membrane Distillation (AGMD) was evaluated to extract ethanol from these complex mixtures.Experiments were conducted using synthetic mixtures and real algal-based fermentation broths.AGMD was able to obtain an ethanol-enriched permeate while other compounds were retained by the membrane. Furthermore, by adjusting the operating parameters, it was possible to maximize the process productivity and selectivity at the same time. Finally, working with the real biofluids revealed that AGMD operation was robust toward membrane wetting, even in presence of membrane fouling.AGMD was thus demonstrated to be a suitable technique for bioethanol extraction from algal-based fermentation broths.

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“…The intrinsic enrichment factor was calculated for the M10/MFFK membrane for the MTBE concentration range 0.2–1.0 wt.%, using the experimental data presented in Figure 8 . The calculation was carried out according to the method described in Reference [ 43 ]. The intrinsic enrichment factor ( E 0 ) is a value that characterizes the separation properties of the membrane and is independent of the processes occurring in the liquid boundary layer.…”

Section: Resultsmentioning

confidence: 99%

“…However, the use of membranes with increased selectivity and permeability for the separation of MTBE from dilute solutions is inevitably accompanied by an increase in the negative contribution of the “concentration polarization” effect, i.e., a decrease in the driving force of the separation process due to a decrease in the concentration of the selectively permeating component (MTBE) in the boundary layer near the membrane surface [ 41 , 42 , 43 ]. Assessing the effect of concentration polarization plays an important role in optimizing the design of the module and conditions of the pervaporation process [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

et al. 2020

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For the first time, the effect of the side-chain in polyalkylmethylsiloxane towards pervaporative removal of methyl tert-butyl ether (MTBE) from water was studied. The noticeable enhancement of separation factor during the pervaporation of 1 wt.% MTBE solution in water through the dense film (40–50 µm) can be achieved by substitution of a methyl group (separation factor 111) for heptyl (161), octyl (169) or decyl (180) one in polyalkylmethylsiloxane. Composite membrane with the selective layer (~8 µm) made of polydecylmethylsiloxane (M10) on top of microfiltration support (MFFK membrane) demonstrated MTBE/water separation factor of 310, which was 72% greater than for the dense film (180). A high separation factor together with an overall flux of 0.82 kg·m−2·h−1 allowed this M10/MFFK composite membrane to outperform the commercial composite membranes. The analysis of the concentration polarization modulus and the boundary layer thickness revealed that the feed flow velocity should be gradually increased from 5 cm·s−1 for an initial solution (1 wt.% of MTBE in water) to 13 cm·s−1 for a depleted solution (0.2 wt.% of MTBE in water) to overcome the concentration polarization phenomena in case of composite membrane M10/MFFK (Texp = 50 °C).

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Influence of feed flow rate, temperature and feed concentration on concentration polarization effects during separation of water-methyl acetate solutions with high permeable hydrophobic pervaporation PDMS membrane

Cited by 46 publications

References 53 publications

Pervaporative separation of methyl acetate–methanol azeotropic mixture using high‐performance polydimethylsiloxane/ceramic composite membrane

Pervaporative separation of methyl acetate–methanol azeotropic mixture using high‐performance polydimethylsiloxane/ceramic composite membrane

Air-gap membrane distillation for the separation of bioethanol from algal-based fermentation broth

High Selective Composite Polyalkylmethylsiloxane Membranes for Pervaporative Removal of MTBE from Water: Effect of Polymer Side-chain

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