Thickness Effect on Permeance of CO2/CH4 Gases in CA
Coated PVDF Composite Membranes |
Ayesha Raza, Muhammad Fahad Yousaf, Sarah Farrukh* and Arshad Hussain
Pages : 89-95
DOI : 10.1080/0371750X.2021.1880969 |
Abstract |
The aim of this work is to study the effect of membrane thickness with respect
to gas permeance and tensile strength. The influence of membrane thickness
on gas permeation has received little attention to date. Single layer flat sheet
membrane with average thickness of 25 m and dual layer composite
membranes with variable thickness of skin layer were fabricated by coating
CA/PEG selective layer on the polyvinylidene fluoride porous support.
Permeation experiments were performed with CO2 and CH4 which revealed
that permeance of CO2 was pronounced compared to CH4. Highest permeance
of 0.87 gas permeation unit (GPU) was obtained at 4 bar with 19.4 m skin layer.
Fourier transform infra-red spectroscopy was used to study the existence of
different functional groups in the membranes. Strength of the membranes
was analyzed using tensile testing machine. Scanning electron microscopy
was used to study the surface structure and morphology. It was found that by
reducing the membrane thickness, the permeance of CO2 and CH4 increased
without compromising on membrane strength.
[Keywords: Composite membranes, Polyvinylidene fluoride, Polyethylene
glycol, Gas separation, Selective layer] |
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