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Membrane separation using hollow fibers is one of the emerging technologies that undergone a rapid growth in the past decades. Hollow fiber plays an important role in gas separation and had also found application in other fields due to its high separation areas and selectivity. Hollow fiber membrane modules are the most used module configuration in gas separation industry because of their unique characteristics of self-support, high membrane packing density and high membrane surface to volume ratio.

In this video, a polysulfone hollow fibers was prepared by dry-wet spinning technique using a self-fabricated hollow fiber spinning apparatus. In this process, an extruded fiber was passed through an air gap where a controlled evaporation took place. Due to the local evaporation, a high polymer concentration is necessary to form a dense (gas selective) membrane top layer is created near the outer surface, After passing through the air gap, the nascent fiber enters a coagulation bath where phase inversion occurs and the membrane structure is arrested.

To prepare macrovoid free hollow fibers, it is important to play with several parameters which includes  Spinneret dimensions, Air gap distance, Bore and dope fluid extrusion rate, Composition of bore and dope fluid, Take up speed or draw ratio and Composition of coagulation bath to optimize the properties of hollow fibers.

In near future, we hope to apply the same technique to make hollow fibers from different polymeric materials for different gas separation or purification.

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