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Amount of recovered gas from the column. (a) Flow direction was downward and amount of supplied N2 was 200 mL; (b) Flow direction was downward and amount of supplied N2 was 50 mL; (c) Flow direction was upward and amount of supplied N2 was 200 mL; (d) Flow direction was upward and supplied N2 was 50 mL. Flow velocity was controlled at 4 cm/min.
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