Hollow fiber membrane model for gas separation: Process simulation, experimental validation and module characteristics study

다국어 초록 (Multilingual Abstract)

Conceptual process simulations and optimization are essential in the design, operation andtroubleshooting stages of a membrane-based gas separation system. Despite this, there are fewmathematicalmodels/tools associated with a hollow fiber membrane module available in a commercialprocess simulator. A mathematical model dealing with the hollow fiber module characteristics that canbe included within a commercial process simulator is needed to examine the performance andeconomics of a gas separation system. In this study, a hollow fiber membrane modelwas incorporated inAspen HYSYS as a user defined unit operation for the study of carbon dioxide separation from methane.
The hollow fibermembrane model was validated experimentally. The study of a double stage membranemodule with a permeate recycle, which was proposed to be the optimal configuration in previousstudies, was extended to consider the effects of the module characteristics (such as the fiber length,radius of the fiber bundle, diameter of the fibers, and porosity) on the process performance andeconomics. The gas processing cost (GPC) increased with increasing fiber length and bundle radius, anddecreased with increasing outer diameter of the fibers and porosity. At the same time, the separationefficiency (product quality) was also dependent on these module parameters. Therefore, the tradeoff forthe hollow fiber membrane module characteristics needs to be determined based on the minimum GPCwith respect to the desired product purity.

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