Separation of ethanol from water by pervaporation using mixed matrix copolymer membranes

Samanta, Himadri S.; Ray, S. K.

doi:10.1016/j.seppur.2015.03.006

Cited by 55 publications

(24 citation statements)

References 45 publications

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“…In the case of separating ethanol–water solutions (such as a fermentation broth), ethanol-selective membranes that can extract ethanol out of the dilute solutions would be preferred and more efficient. Most of the hydrophobic membranes in the literature for ethanol pervaporation have so far considered materials such as zeolites/silicalite and their supported thin layers [27,28,29,30,31], polymers such as polydimethylsiloxane (PDMS) [32], polymer-zeolite hybrids [33,34,35], and polymer-inorganic mixed matrices [36,37,38,39]. Recently, some works have considered superhydrophobicity for membrane separations of ethanol–water mixtures [40,41].…”

Section: Introductionmentioning

confidence: 99%

Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures

Engtrakul

Bischoff

et al. 2018

Membranes

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Surface wettability-tailored porous ceramic/metallic membranes (in the tubular and planar disc form) were prepared and studied for both vapor-phase separation and liquid pervaporative separations of water-ethanol mixtures. Superhydrophobic nanoceramic membranes demonstrated more selective permeation of ethanol (relative to water) by cross-flow pervaporation of liquid ethanol–water mixture (10 wt % ethanol feed at 80 °C). In addition, both superhydrophilic and superhydrophobic membranes were tested for the vapor-phase separations of water–ethanol mixtures. Porous inorganic membranes having relatively large nanopores (up to 8-nm) demonstrated good separation selectivity with higher permeation flux through a non-molecular-sieving mechanism. Due to surface-enhanced separation selectivity, larger nanopore-sized membranes (~5–100 nm) can be employed for both pervaporation and vapor phase separations to obtain higher selectivity (e.g., permselectivity for ethanol of 13.9 during pervaporation and a vapor phase separation factor of 1.6), with higher flux due to larger nanopores than the traditional size-exclusion membranes (e.g., inorganic zeolite-based membranes having sub-nanometer pores). The prepared superhydrophobic porous inorganic membranes in this work showed good thermal stability (i.e., the large contact angle remains the same after 300 °C for 4 h) and chemical stability to ethanol, while the silica-textured superhydrophilic surfaced membranes can tolerate even higher temperatures. These surface-engineered metallic/ceramic nanoporous membranes should have better high-temperature tolerance for hot vapor processing than those reported for polymeric membranes.

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Section: Introductionmentioning

confidence: 99%

Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures

Engtrakul

Bischoff

et al. 2018

Membranes

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“…The comparison of some PDMS‐based composite membranes is given in Table . As can be seen, the membrane synthesized in the present study has the best selectivity.…”

Section: Resultsmentioning

confidence: 79%

“…The comparison of some PDMS-based composite membranes is given in Table 5. 16,22,[47][48][49] As can be seen, the membrane synthesized in the present study has the best selectivity. A notable point is the low nanoparticle loading in the PDMS membrane which is very important for industrial use.…”

Section: Kinetic Model Investigationmentioning

confidence: 99%

Highly selective carbon nanotube‐coupled graphene oxide‐incorporated polydimethylsiloxane membrane for pervaporative membrane bioreactor ethanol production

Amrei

Asghari

Esfahanian

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND In this work, a pervaporation membrane bioreactor (PVMBR) with the novel ethanol permselective membrane was used to achieve ethanol production with high yield. For this purpose, ethanol produced by Saccharomyces cerevisiae from glucose and pervaporation was performed via dense hydrophobic polydimethylsiloxane (PDMS) having carbon nanotube‐graphene oxide (CNT‐GO) mixed matrix membrane. Different percentages of CNT‐GO (0, 0.25, 0.5, 0.75, and 1) were loaded in polymer matrix. Synthesized membranes were analyzed using FESEM, AFM, FTIR and XRD. RESULTS The bonding of groups in CNT‐GO, that was synthesized in this work, and membranes was characterized and confirmed using FTIR test. Considering the existence of 0.75 wt% of CNT‐GO in PDMS showed the highest ethanol selectivity of 22.5 in synthetic ethanol‐water solution, this incorporation was selected to use in PVMBR. The high ethanol selectivity was proved using XRD patterns. Also, FESEM indicated the optimum dispersion of nanoparticles at 0.75% of loading and AFM proofed the optimum surface roughness at this percentage. CONCLUSIONS The results showed that maximum ethanol production in PVMBR was achieved after 44 h with productivity of 0.5g.l−1.h−1 in feed side and 9.89 g.l−1.h−1 in permeate side. In fact, PVMBR enhanced the ethanol concentration up to 26 times. © 2020 Society of Chemical Industry

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“…Pervaporation is one of the most promising approaches for the removal of ethanol from fermentation broth or aqueous solution because it does not cause any harmful effect on the microorganisms and has good separation performance . Coupling pervaporation with ethanol fermentation, a reduced effect of products inhibition could increase products production and improve equipment utilization with less waste water processed .…”

Section: Introductionmentioning

confidence: 99%

Pervaporation performance in PDMS membrane bioreactor for ethanol recovery with running water and air as coolants at room temperature

Fan

Xiao

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND Pervaporation performance in a PDMS membrane bioreactor for ethanol recovery from model solution and fermentation broth was researched. Downstream of the membrane the permeate vapor was completely condensed by running water and air at room temperature. RESULTS Part of the permeate vapor was condensed under vacuum conditions by running water at room temperature in condenser C1, with ethanol concentration of 47.2 g L−1 obtained. The vacuum pump in the pervaporation membrane bioreactor was used to compress and pump the non‐condensed permeate vapor with ethanol concentration of 461.3 g L−1 into the condenser C2, where the vapor could be easily condensed under atmospheric conditions by air at room temperature. During the experimental ethanol recovery from model solution the total flux and separation factor were about 1100 g m−2 h−1 and 8.0, respectively, while the permeate flux of the membrane was reduced during the separation of fermentation broth. CONCLUSION Compared with a traditional pervaporation process, the cold trap condensation was eliminated in the process and enhanced ethanol fermentation was achieved since pervaporation was continuously coupled with fermentation. © 2016 Society of Chemical Industry

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Separation of ethanol from water by pervaporation using mixed matrix copolymer membranes

Cited by 55 publications

References 45 publications

Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures

Surface-Engineered Inorganic Nanoporous Membranes for Vapor and Pervaporative Separations of Water–Ethanol Mixtures

Highly selective carbon nanotube‐coupled graphene oxide‐incorporated polydimethylsiloxane membrane for pervaporative membrane bioreactor ethanol production

Pervaporation performance in PDMS membrane bioreactor for ethanol recovery with running water and air as coolants at room temperature

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