CO2 Absorption Characteristics and Mass Transfer Performance in Grafted PVDF Hollow Fiber Membrane Contactor
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Abstract:
In this paper, CO2 absorption characteristics and mass transfer performance in N-isopropyl acrylamide (PNIPAM) grafted PVDF hollow fiber membrane contactor using NaOH solution as absorbing liquid to absorb carbon dioxide were studied, and then mass transfer model of CO2 absorption was established. The absorption rates of carbon dioxide in PVDF hollow fiber membrane contactor was improved by the increase in the concentration and flow rate of absorbing liquid, while decreased with gas flow. The optimal processing parameters for absorbing CO2 via grafted PVDF hollow fiber membrane contactor were: 0.4 mol/L of absorbing liquid concentration, 16 L/h of flow rate of absorbing liquid, and 250 L/h of gas flow rate at a counter flow of gas against absorbing liquid. Under the above operating conditions, the absorption rate of carbon dioxide was nearly 100% and total mass transfer coefficient is KG=17.5?26.3×10-5 mol?m-2?s-1?KPa-1. The mass transfer flux was about NCO2=3.8?7.6×10-6 mol?m-2?s-1. The characteristics of absorption of CO2 for grafted PVDF membrane contactor were of good efficiency of absorption.
