Separation of CO2 from CO2-air Mixture Using ILM Membrane Containing TEG-DEA

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Ahadi, Hossein | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43819 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Bastani, Dariush
Abstract:
CO2 separation from air was investigated in this work. An immobilized liquid membrane (ILM) which contains triethylene glycol (TEG) and diethanolamine (DEA) was used for this purpose. In this kind of membranes a liquid, which improves permeability of gas species through the membrane, fills the pores of a polymeric membrane as support. Because of low vapor pressure of solution, liquid loss was negligible. Transport of CO2 was facilitated due to reversible chemical reaction between CO2 and amine solution. A polyvinylidene fluoride (PVDF) membrane was chosen to have chemical resistance against the solution and prevent destruction of polymer by solution. A flat sheet and hydrophilic PVDF was purchased. The experiments were done in 0.5, 0.8 and 1 bar and different concentration of solution and permeability and selectivity of gases were determined separately. Adding DEA to TEG to about 20%wt show the most permeability of CO2. Gas selectivity was about 11-17 as a result. It was seen that permeability was increased by increasing the pressure but selectivity had a little decrease
Keywords:
Carbon Dioxide Separation ; Carbon Dioxide-Air Separation ; Diethanolamine-Triethylene Glycol ; Immobilized Liquid Membrane

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