Energy consumption in pervaporation, conventional and hybrid processes to separate toluene and i-octane

Khazaei, Ali; Mohebbi, Vahid; Behbahani, Reza Mosayebi; Ramazani, S A Ahmad

doi:10.1016/j.cep.2018.04.009

Cited by 15 publications

(5 citation statements)

References 17 publications

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“…Variants of conventional MD have recently been investigated for the recovery of low molecular weight organics, such as ammonia [110][111][112]. Pervaporation is also an effective means to remove trace organics from an aqueous solution [113][114][115]. Solvent-driven crystallizers that incorporate membrane-based filtration for high-efficacy solvent regeneration are under development for applications in water adsorption and recovery.…”

Section: Solvent Recovery and Regenerationmentioning

confidence: 99%

Solvent-driven aqueous separations for hypersaline brine concentration and resource recovery

Foo

Stetson

Dach

et al. 2022

Trends in Chemistry

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Section: Solvent Recovery and Regenerationmentioning

confidence: 99%

Solvent-driven aqueous separations for hypersaline brine concentration and resource recovery

Foo

Stetson

Dach

et al. 2022

Trends in Chemistry

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“…The combination of fermentation and separation technologies is proposed, which aims to optimize solvent production while reducing the associated costs. , Compared with conventional separation techniques, e.g., distillation, pervaporation (PV) offers competitive advantages in the separation of azeotropic mixtures, thermosensitive compounds, and organic–organic mixtures, while PV outperforms distillation in selectivity and energy efficiency . This makes PV a very attractive separation technology …”

Section: Introductionmentioning

confidence: 99%

“…A variety of hydrophobic materials, for example, polydimethylsiloxane (PDMS), poly(1-trimethylsilyl-1-propyne), and polyether- block -polyamide, are used in the preparation of the perm-selective PV membranes. − Among them, PDMS, also called silicone rubber, can be considered the benchmark of alcohol-selective membranes, which shows good processability, reliable stability, a low cost, and excellent organics selectivity . Currently, most preparation methods focus on the thermal-driven polymerization of PDMS, e.g., Li et al prepared a line and space-patterned PDMS membrane by using tetraethyl orthosilicate, triethoxyvinylsilane, or p -tolyltriethoxysilane as cross-linkers under the oven for 4 h at 80 °C.…”

Section: Introductionmentioning

confidence: 99%

“…5 This makes PV a very attractive separation technology. 6 A variety of hydrophobic materials, for example, polydimethylsiloxane (PDMS), poly(1-trimethylsilyl-1-propyne), and polyether-block-polyamide, are used in the preparation of the perm-selective PV membranes. 5−7 Among them, PDMS, also called silicone rubber, can be considered the benchmark of alcohol-selective membranes, which shows good processability, reliable stability, a low cost, and excellent organics selectivity.…”

Section: ■ Introductionmentioning

confidence: 99%

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Photopolymerized Fabrication Method for PDMS Pervaporative Membranes

Li,

Yang,

Zhan

et al. 2023

Ind. Eng. Chem. Res.

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The polydimethylsiloxane (PDMS) membrane can be considered the benchmark of alcohol-selective membranes, and its preparation method by photopolymerization shows a great potential on the industrial scale. However, a single photopolymerization system by a free radical or cation is still a challenge to simultaneously have a high reaction speed and oxygen insensitivity. In this work, we proposed a free radical/cationic hybrid membrane-forming system toward PDMS. Both methacrylate groups and epoxy groups were introduced into the PDMS chain by the covalent bonding of 3-methacryloxypropylmethyldimethoxysilane and 3-glycidyloxypropyl(dimethoxy)methylsilane with PDMS. This hybrid system can be quickly cured by a free radical reaction which weakens the oxygen inhibition by a cationic reaction. Furthermore, the transport structure of membranes is effectively controlled by the difference in the reactivity between methacrylate and epoxy groups, where the formed molecular weight and viscosity of the prepolymer are changed from 62,860 to 108,198 g mol −1 and 1.53 to 2.26 Pa s, respectively, and the free volume of membranes is tuned from 5.567 to 6.253%. By optimization, the pervaporation performance of the membrane includes a 1-butanol separation factor of 37.9 and a total flux of 1179 g m −2 h −1 as evaluating 1.5 wt % 1-butanol/water solutions at 55 °C, which has a high superiority coupled with the fast reaction speed and oxygen insensitivity.

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“…When both the membrane and feed are in contact, some molecules can be recovered from the feed due to its higher affinity and quicker diffusivity in the membrane [ 4 ], which can be carried out applying a differential pressure between the membrane walls through a vacuum pump or a carrier gas [ 5 ]. The main advantage of pervaporation is the low energy consumption compared with traditional processes such as distillation and liquid-liquid extraction [ 6 , 7 , 8 ], but also the possibility to work at moderate temperature can be an advantage for the separation of temperature sensitive products, be an environmentally friendly process [ 9 ], reduces the cost of production, generates products free from solvent contamination and can be adapted to both continuous and batch processes [ 10 ]. Initially, pervaporation was intended for the selective separation of azeotropic mixtures.…”

Section: Introductionmentioning

confidence: 99%

Separation and Semi-Empiric Modeling of Ethanol–Water Solutions by Pervaporation Using PDMS Membrane

et al. 2020

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High energy demand, competitive fuel prices and the need for environmentally friendly processes have led to the constant development of the alcohol industry. Pervaporation is seen as a separation process, with low energy consumption, which has a high potential for application in the fermentation and dehydration of ethanol. This work presents the experimental ethanol recovery by pervaporation and the semi-empirical model of partial fluxes. Total permeate fluxes between 15.6–68.6 mol m−2 h−1 (289–1565 g m−2 h−1), separation factor between 3.4–6.4 and ethanol molar fraction between 16–171 mM (4–35 wt%) were obtained using ethanol feed concentrations between 4–37 mM (1–9 wt%), temperature between 34–50 ∘C and commercial polydimethylsiloxane (PDMS) membrane. From the experimental data a semi-empirical model describing the behavior of partial-permeate fluxes was developed considering the effect of both the temperature and the composition of the feed, and the behavior of the apparent activation energy. Therefore, the model obtained shows a modified Arrhenius-type behavior that calculates with high precision the partial-permeate fluxes. Furthermore, the versatility of the model was demonstrated in process such as ethanol recovery and both ethanol and butanol dehydration.

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Energy consumption in pervaporation, conventional and hybrid processes to separate toluene and i-octane

Cited by 15 publications

References 17 publications

Solvent-driven aqueous separations for hypersaline brine concentration and resource recovery

Solvent-driven aqueous separations for hypersaline brine concentration and resource recovery

Photopolymerized Fabrication Method for PDMS Pervaporative Membranes

Separation and Semi-Empiric Modeling of Ethanol–Water Solutions by Pervaporation Using PDMS Membrane

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