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Separation of CO~2~/CH~4~ and O~2~/N~2~ by polysulfone hollow fiber membranes: effects of membrane support properties and surface coating materials by Rosyiela Azwa Roslan; Woei Jye Lau; Divya Barathi Sakthivel; Shahab Khademi; Abdul Karim Zulhairun; Pei Sean Goh; Ahmad Fauzi Ismail; Kok Chung Chong; Soon Onn Lai is a Materials Science article available to read on EtoBox.

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In this study, six different types of polysulfone hollow fiber membranes were fabricated from the same polymeric dope solution by manipulating several important parameters during the spinning process, aiming to find the best membrane supports for the coating layer in the gas separation process. The experimental results showed that upon the polydimethylsiloxane (PDMS) coating process, the gas pair selectivities of all six types of membranes were significantly increased with respect to carbon dioxide (CO 2 )/methane (CH 4 ) and oxygen (O 2 )/ nitrogen (N 2 ) separation. However, the membrane support spun at higher air gap and lower dope extrusion rate was found to be the best support for PDMS coating owing to its good structural integrity that led to a good balance between gas permeance and gas pair selectivity. Further investigation showed that the use of poly(ether block amide) (Pebax) as coating material did not certainly improve both gas permeance and the selectivity of hollow fiber membranes, although Pebax was previously reported to exhibit better performance than PDMS in flat sheet membranes. One of the main reasons is the difficulty of forming a defect-free Pebax coating laye

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Author

Rosyiela Azwa Roslan; Woei Jye Lau; Divya Barathi Sakthivel; Shahab Khademi; Abdul Karim Zulhairun; Pei Sean Goh; Ahmad Fauzi Ismail; Kok Chung Chong; Soon Onn Lai

Publisher

Walter de Gruyter GmbH

Published

2018

Language

EN

Field

Materials Science (Physical Sciences)