Methyl acetate production by coupled esterification-reaction process using synthesized cross-linked PVA/silica nanocomposite membranes

Torabi, Behzad; Ameri, Elham

doi:10.1016/j.cej.2015.12.011

Cited by 58 publications

(31 citation statements)

References 37 publications

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“…Similar results have been reported by other researchers. 3,31 This phenomenon is explained as follows: with the decrease of acid concentration, the competitive adsorption relationship between propionic acid and ethanol hinders propionic acid from contacting the catalytic layer. Additionally, a considerable amount of ethanol is adsorbed in the catalytic layer because of the higher concentration of ethanol, which reduces the reaction rates and offsets the increased acid conversion.…”

Section: Pervaporation and Coupling Studiesmentioning

confidence: 99%

“…However, these methods have many disadvantages, like high energy consumption and separation difficulty. Recently, removal of water from esterification by pervaporation (PV) has attracted more attention . The couplings of different esterification reactions and various PV membranes were reported .…”

Section: Introductionmentioning

confidence: 99%

“…With the development of membrane materials, membrane separation technology is increasingly integrated with other unit operations, which can reduce equipment investment and energy consumption. The coupling of reaction and membrane separation has become a widely used integration, and it has three areas of application 1 : (1) coupling with reversible reactions for yield enhancement by selective removal of reaction products, (2) coupling with successive reactions for selectivity enhancement by means of selective removal of intermediate product, (3) coupling with parallel reactions for selectivity enhancement via controlling the flux of one reactant.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, removal of water from esterification by pervaporation (PV) has attracted more attention. 3 The couplings of different esterification reactions and various PV membranes were reported. [4][5][6][7][8][9][10] Water is generated on the surface of the solid catalyst and then diffused into the bulk solution, and it has a long distance to diffuse into the PV membrane.…”

Section: Introductionmentioning

confidence: 99%

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Development of stable and active PVA‐PSSA/SA‐PVA catalytic composite membrane for esterification enhancement

Han

Bai

et al. 2018

J of Applied Polymer Sci

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An active and stable catalytic composite membrane (CCM), poly(vinyl alcohol)–poly(styrene sulfonic acid)/sodium alginate–poly(vinyl alcohol) (PVA‐PSSA/SA‐PVA), was prepared to enhance the esterification of ethanol and propionic acid. The morphologies and crystal structures of the CCMs were investigated by Fourier transform infrared spectroscopy, scanning electron microscopy, and X‐ray diffraction. The effects of catalytic layer thickness, mass ratio of PVA to PSSA, concentration of catalytic layer solution, ratio of reaction volume to membrane area, and molar ratio of propionic acid to ethanol were discussed. The pervaporation results showed that the flux of CCM increased from 118 to 320 g m−2 h−1 compared with the SA‐PVA membrane because of the close affinity and low resistance of PSSA to water. After crosslinking with 3‐aminopropylmethyldiethoxysilane, the CCMs had good catalytic activities. The acid conversion reached 92.8% at 75 °C in 12 h, and the stabilization of the CCM was greatly improved. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46514.

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Section: Pervaporation and Coupling Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of stable and active PVA‐PSSA/SA‐PVA catalytic composite membrane for esterification enhancement

Han

Bai

et al. 2018

J of Applied Polymer Sci

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“…SNPs contain an adequate amount of silanol groups on their surface, rendering them facile for surface modification. When SNPs are modified by different organosilanes, the hydrophilic-hydrophobic properties of the SNPs can be flexibly tuned to enhance the compatibility with the polymer matrix [25].In our previous work, we used a neat PTMSP membrane to study transient and steady-state pervaporation to remove 1-butanol from an aqueous mixture. For that purpose, a new apparatus and model allowing for the measurement of pervaporation transients and to evaluate diffusivity were developed [26].…”

mentioning

confidence: 99%

Selective Separation of 1-Butanol from Aqueous Solution through Pervaporation Using PTSMP-Silica Nano Hybrid Membrane

et al. 2020

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In this work, a poly(1-trimethylsilyl-1-propyne) (PTMSP) mixed-matrix membrane was fabricated for the selective removal of 1-butanol from aqueous solutions through pervaporation. Silica nanoparticles (SNPs), which were surface-modified with surfactant hexadecyltrimethylammonium bromide (CTAB), were incorporated into the structure of the membrane. The modified membrane was characterized by thermogravimetry-differential scanning calorimetry (TG-DSC), contact angle measurements, and scanning electron microscope (SEM) analysis. It was found that the surface hydrophobicity of the membrane was improved when compared to neat PTMSP by contact angle measurement. It was confirmed by SEM analysis that a uniform distribution of surface-modified SNPs throughout the PTMSP membrane was achieved. The thermogravimetric analysis detected the thermal degradation of the modified PTMSP at 370 °C, which is comparable to neat PTMSP. The pervaporation measurements showed a maximum separation factor of 126 at 63 °C for 1.5 w/w% 1-butanol in the feed. The maximum total flux of approximately 1.74 mg·cm−2·min−1 was observed with the highest inspected temperature of 63 °C and at the 1-butanol concentration in the feed 4.5 w/w%. The pervaporation transients showed that the addition of the surface-modified SNPs significantly enhanced the diffusivity of 1-butanol in the composite compared to the neat PTMSP membrane. This improvement was attributed to the influence of the well-dispersed SNPs in the PTMSP matrix, which introduced an additional path for diffusivity.

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Fabrication of MWCNT_S‐functionalized SA pervaporation composite membranes to enhance esterification

Shi

Han

Liang

et al. 2021

J of Applied Polymer Sci

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A novel SA‐f‐MWCNTs/PAN composite membrane, sodium alginate‐ functionalized multi‐walled carbon nanotubes/polyacrylonitrile, was prepared to enhance the esterification conversion rate with a pervaporation membrane reactor. The SA‐f‐MWCNTs/PAN membrane was investigated by Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, and scanning electron microscope. The hydrophilicity, mechanical properties, and separation performance of the composite membrane have been significantly improved. The flux of the composite membrane was 4374 g·m−2·h−1, and the separation factor was 1249 (the water content in the feed was 10 wt%, at 75°C). The composite membrane the trade‐off effect between flux and separation factor. The acid conversion rate of SA‐f‐MWCNTs/PAN membrane was up to 98.3% in 5 h at 75°C, which was a great increase of 18.3% compared with the equilibrium conversion rate of the batch reactor. In addition, SA‐f‐MWCNTs/PAN membrane exhibited good swelling resistance and reusability. The conversion rate of acetic acid was stable above 95.0% after 8 repetitive tests.

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Methyl acetate production by coupled esterification-reaction process using synthesized cross-linked PVA/silica nanocomposite membranes

Cited by 58 publications

References 37 publications

Development of stable and active PVA‐PSSA/SA‐PVA catalytic composite membrane for esterification enhancement

Development of stable and active PVA‐PSSA/SA‐PVA catalytic composite membrane for esterification enhancement

Selective Separation of 1-Butanol from Aqueous Solution through Pervaporation Using PTSMP-Silica Nano Hybrid Membrane

Fabrication of MWCNT_S‐functionalized SA pervaporation composite membranes to enhance esterification

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Methyl acetate production by coupled esterification-reaction process using synthesized cross-linked PVA/silica nanocomposite membranes

Cited by 58 publications

References 37 publications

Development of stable and active PVA‐PSSA/SA‐PVA catalytic composite membrane for esterification enhancement

Development of stable and active PVA‐PSSA/SA‐PVA catalytic composite membrane for esterification enhancement

Selective Separation of 1-Butanol from Aqueous Solution through Pervaporation Using PTSMP-Silica Nano Hybrid Membrane

Fabrication of MWCNTS‐functionalized SA pervaporation composite membranes to enhance esterification

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Fabrication of MWCNT_S‐functionalized SA pervaporation composite membranes to enhance esterification