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Organic solvent removal by pervaporation membrane technology: experimental and simulation

Environmental Science and Pollution Research volume 25, pages 19818–19825 (2018)Cite this article

Abstract

This work presents purification of cyclohexane using polydimethylsiloxane (PDMS) membranes in pervaporation (PV) process. The PDMS is a rubbery polymer and appropriate as membrane material for purification of cyclohexane. PV which is a low-energy separation process was chosen for purification of cyclohexane due to its superior advantages compared to other processes. Effect of feed concentration on separation factor was investigated in order to optimize the process. It was indicated that dehydration of 80 wt% cyclohexane mixture at a temperature of 300 K and a vacuum pressure of 10 mmHg could be effectively achieved and high separation factor of 2500 was obtained. Furthermore, a two-dimensional mechanistic model was proposed for predicting mass transfer of cyclohexane in the process. The mechanistic model accounts for mass transfer of cyclohexane across the membrane, and concentration distribution of cyclohexane was determined. It was revealed that the most mass transfer flux of cyclohexane occur at the region near the inlet of feed channel, while the flux at the upper side of the module reaches zero value due to the effect of velocity distribution on the convective mass transfer of cyclohexane.

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Abbreviations

C :

concentration (mol/m3)

D :

diffusion coefficient (m2/s)

E :

activation energy (J)

F:

body force (N)

H :

enthalpy (J)

L :

module length (m)

m :

partition coefficient

p :

pressure (Pa)

R :

reaction term (mol/m3.s)

t :

time (s)

T:

temperature (K)

V :

velocity vector (m/s)

x :

x coordinate (m)

X :

weight fraction in feed phase

y :

y coordinate (m)

Y:

weight fraction in permeate phase

α :

separation factor

η :

dynamic viscosity (kg/m s)

ρ :

density of the fluid (kg/m3)

CX :

cyclohexane

PDMS :

polydimethylsiloxane

PV :

pervaporation

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Affiliations

  1. Faculty of Chemical and Materials Engineering, Shahrood University of Technology, Shahrood, Iran

    Mashallah Rezakazemi

  2. Department of Chemistry, Islamic Azad University, Arak Branch, Arak, Iran

    Azam Marjani

  3. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Saeed Shirazian

  4. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Saeed Shirazian

Authors
  1. Mashallah Rezakazemi
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  2. Azam Marjani
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  3. Saeed Shirazian
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Correspondence to Saeed Shirazian.

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Responsible editor: Angeles Blanco

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Rezakazemi, M., Marjani, A. & Shirazian, S. Organic solvent removal by pervaporation membrane technology: experimental and simulation. Environ Sci Pollut Res 25, 19818–19825 (2018). https://doi.org/10.1007/s11356-018-2155-3

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  • DOI: https://doi.org/10.1007/s11356-018-2155-3

Keywords

  • Membranes
  • Mechanistic modeling
  • Cyclohexane purification
  • Diffusion
  • Mass transfer
  • Simulations