Abstract
In the present work porous poly (vinylidene fluoride) (PVDF) hollow fiber membranes were fabricated via thermally induced phase separation (TIPS) method for the application in gas-liquid membrane contactor. For this purpose long air gap distance was used (90 mm). Scanning electron microscopy (SEM) was used for membrane characterization. Gas permeation test was performed using carbon dioxide as test gas. It was observed that the effective surface porosity and membrane pore size increased with increased glycerol concentration. CO2 absorption using the fabricated hollow fiber membranes were measured in a gas-liquid hollow fiber membrane contactor. The results of the CO2 absorption rate of the tested fibers revealed that complete removal of CO2 was achieved using 7% glycerol added to the casted solution at normal operating conditions for equal gas to liquid volumetric flow rates using sodium hydroxide as absorbent liquid.
Highlights
Packed bed absorbers have been extensively used in many industries and it is successful in removing undesirable gases and impurities from gas streams
In spite of the success of the packed bed absorbers, there are number of weak points such as flooding at high flow rates and foaming Gabelman and Huang [1]. To overcome this drawback in gas absorbers, microporous hollow fiber membrane contactors for gas separation have been attracting the attention of many researchers as an alternative technology, which overcomes the weaknesses of conventional gas absorption equipments Rangwala [2]
The outer surface of the membrane prepared with PVDF/ triacetin/glycerol system is more porous than that prepared with PVDF/triacetin system without glycerol additives
Summary
Packed bed absorbers have been extensively used in many industries and it is successful in removing undesirable gases and impurities from gas streams. Xu et al [13] uses PVDF hollow fiber membranes with an inner skinless surface prepared via the NIPS process in the removal of CO2 from gas mixture.
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