CO2 Absorption/Desorption on Gas-Liquid Membrane Contactors Using Monoethanolamine Solvent: Comparison of Porous and Composite Hollow Fibers
| Autor: | Eduard G. Novitskii, S. D. Bazhenov, Margarita Kostyanaya |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering Composite number 02 engineering and technology 021001 nanoscience & nanotechnology Solvent Membrane 020401 chemical engineering Chemical engineering Mechanics of Materials Desorption Co2 absorption General Materials Science 0204 chemical engineering Absorption (chemistry) 0210 nano-technology Porosity Contactor |
| Zdroj: | Key Engineering Materials. 869:321-335 |
| ISSN: | 1662-9795 |
| Popis: | The operating efficiency of asymmetric porous and composite membranes with a thin non-porous selective layer was compared in the processes of CO2 absorption and desorption in gas-liquid membrane contactors using aqueous solutions of monoethanolamine (MEA) with low concentration (2 mass transfer were evaluated. Porous membranes were shown to be more effective in the process of CO2 absorption, because they allow to remove more than 90 % of CO2 from the gas mixture during one pass of the solvent through the contactor. Composite membranes were more promising for CO2 desorption, since they provide half as much of the solvent vapor losses with comparable desorbed CO2 fluxes (0.12-(STP)/(m2·h)). The contributions of membrane and liquid phase to the overall mass transfer resistance during the CO2 absorption process were estimated. It was demonstrated that deposition of a thin selective layer from a highly permeable PTMSP with a thickness of only 3 μm increases the membrane contribution to the total mass transfer resistance from 10-20 % to 60-80 %. |
| Databáze: | OpenAIRE |
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