| Summary: | 碩士 === 逢甲大學 === 化學工程學系 === 103 === In industry, the most commonly method of separate carbon dioxide is chemical absorption. However, shortcomings of complicated operation, solvents disposal and pipelines corrosion were extensively problems on the biogas purification process for capturing the carbon dioxide. Hence, this study used the membrane separation technology. The advantages of this membrane purification technology including more effectively remove carbon dioxide, process simple, operational easy, low cost and low energy consumption.
In this study, two kind of membrane with amine modification were prepared. First, the bio-cellulose nanofiber was immersed in ethylenediamine (EDA) or 1,3-diaminopropane (PDA) in different times. Second, the Poly(phenylene oxide) (PPO) membrane react with EDA or PDA in different weight percentage. The results showed when mono gas CO2, or H2 was introduced, and the pressure of 3 atm at room temperature for permeability and selectivity experiments, the membranes presents a high CO2 permeability is 1446 barrer and 140 barrer, and the selectivity of CO2/H2 is 0.62 and 0.41 respectively.
The composite membrane prepared by the membranes of PPO-PDA 20wt.% and Bio-CNF-PDA in15 min. The composite membrane presents a low CO2 gas permeability is 0.26 barrer in a H2/CO2 mixed gas, while in the mono gas CO2 is 0.57 barrer, and its selectivity showed almost the same value as the membrane of Bio-CNF-PDA in 15 min treatment, is 0.64.
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