Influence of downstream pressure on pervaporation properties of PDMS and POMS based membranes

Kujawska, Anna; Knozowska, Katarzyna; Kujawa, Joanna; Kujawski, Wojciech

doi:10.1016/j.seppur.2015.12.057

Cited by 79 publications

(24 citation statements)

References 61 publications

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“…A number of hydrophobic polymers have been investigated for organophilic pervaporation, including poly(dimethylsiloxane) (PDMS) [9], poly(octylmethyl siloxane) (POMS) [10][11][12], polyvinylidene fluoride (PVDF) [13], polyether-block-polyamide (PEBA) [14], poly(1-trimethylsilyl-1-propyne) (PTMSP) [15] and the polymer of intrinsic microporosity PIM-1 [16][17][18][19]. Inorganic membrane materials such as silicalite-1 [20] have also been employed.…”

Section: Introductionmentioning

confidence: 99%

High-flux PIM-1/PVDF thin film composite membranes for 1-butanol/water pervaporation

Gao

Alberto

Gorgojo

et al. 2017

Journal of Membrane Science

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Membranes that enable the recovery of organic compounds from dilute aqueous solution are desired for applications such as biobutanol production. The polymer of intrinsic microporosity PIM-1 shows promise for organophilic separations and here it is incorporated into thin film composite (TFC) membranes in order to increase the flux of permeate. Asymmetric polyvinylidene fluoride (PVDF) supports were prepared with pore sizes at the surface in the size range 25-55 nm and fractional surface porosities in the range 0.38-0.69, as determined by atomic force microscopy (AFM). The addition of phosphoric acid to the PVDF dope solution helped to control the pore size and porosity. Supports were coated with PIM-1 to form TFC membranes with active layer thicknesses in the range 1.0-2.9 m. Membranes were tested for the pervaporation of a 1-butanol/water mixture (5 wt.%). At 65 C, values of total flux up to 9 kg m-2 h-1 were obtained, with separation factors up to 18.5 and values of pervaporation separation index (PSI) up to 112 kg m 2 h 1 .

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Section: Introductionmentioning

confidence: 99%

High-flux PIM-1/PVDF thin film composite membranes for 1-butanol/water pervaporation

Gao

Alberto

Gorgojo

et al. 2017

Journal of Membrane Science

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“…The permeate pressure has a significant influence on the fluxes but not on the separation factor, as the fluxes decrease with increasing permeate pressure and the separation factor remains almost constant. The driving force for mass transfer across the membrane in the PV process is the difference in the partial vapor‐liquid pressure of the separated species across the membrane, which can be created by vacuum . An increase in permeate pressure will decrease the difference in partial pressure and the transmembrane driving force, leading to a lower flux .…”

Section: Resultsmentioning

confidence: 99%

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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“…The PFF droplet lies quiescently and spreads out on the top surface of polydimethylsiloxane (PDMS) in the absence of applied fields, as shown in Figure 1 a. Its contact angle is about 39°, which indicates the PFF wettability on the surface of PDMS, though PDMS has a relatively low surface tension [ 33 ]. The spreading droplet is drawn into an identical pointed cone geometry when the magnetic field is applied on the PFF droplet, as shown in Figure 1 b, which is the Rosensweig instability of the PFF droplet by the static self-assembling under the magnetic field.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Magnetic Nanofibers by Needleless Electrospinning from a Self-Assembling Polymer Ferrofluid Cone Array

et al. 2017

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Magnetic nanofiber has been widely applied in biomedical fields due to its distinctive size, morphology, and properties. We proposed a novel needleless electrospinning method to prepare magnetic nanofibers from the self-assembling “Taylor cones” of poly(vinyl pyrrolidone) (PVP)/Fe3O4 ferrofluid (PFF) under the coincident magnetic and electric fields. The results demonstrated that a static PFF Rosensweig instability with a conical protrusion could be obtained under the magnetic field. The tip of the protrusion emitted an electrospinning jet under the coincident magnetic and electric fields. The needleless electrospinning showed a similar process phenomenon in comparison with conventional electrospinning. The prepared nanofibers were composed of Fe3O4 particles and PVP polymer. The Fe3O4 particles aggregated inside and on the surface of the nanofibers. The nanofibers prepared by needleless electrospinning exhibited similar morphology compared with the conventionally electrospun nanofibers. The nanofibers also exhibited good ferromagnetic and magnetic field responsive properties.

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Influence of downstream pressure on pervaporation properties of PDMS and POMS based membranes

Cited by 79 publications

References 61 publications

High-flux PIM-1/PVDF thin film composite membranes for 1-butanol/water pervaporation

High-flux PIM-1/PVDF thin film composite membranes for 1-butanol/water pervaporation

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

Fabrication of Magnetic Nanofibers by Needleless Electrospinning from a Self-Assembling Polymer Ferrofluid Cone Array

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