Modeling study of PEBAX mixed field membrane in order to CO2 separation

The main purpose of this study is the analysis of PEBAX MH 1657 polymeric membrane performance during CO2 separation using computational fluid dynamic (CFD). To this aim, a two-dimensional isothermal CFD model was developed and its validation was realized by comparing the theoretical results of Rahman et al. In this work, the CFDmodel was presented by Comsol-Multiphysics software version 5.3.1. Regarding to model validation results, a good agreement between modeling results and experimental data was found. After model validation, the effect of the some important operating parameter (temperature) on the performance of PEBAX MH 1657 was studied in terms of CO2 capturing. The CFD model presented velocity and pressure profiles in both side of PEBAX MH 1657 and also molar fraction of different species in permeate and retentate streams. The simulation results illustrated that the PEBAX MH 1657 presents comparable performance with respect to traditional polymeric membranes in terms of the CO2 capturing, especially, at lower temperatures. In fact, CFD results indicated that PEBAX MH 1657 performance was improved by increasing the reaction pressure, while this parameter had negative effect on the TR performance. This result related to enhancement of CO2 permeance through the membrane by increasing the pressure gradient. Indeed, this shift effect can provide a higher CO2 separation in lower temperatures. In particular, 50% CO2 separation was achieved at 3 0C

Keywords:

PEBAX , Gas separation membrane , CFD study , CO2 capturing.