【Daily Question】Chemical Engineering Principles 227: Countercurrent Absorption Tower (November 8)
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This post was last edited by “Back to Cambridge” on November 13, 2015, at 15:31. Starting today, the Chemical Engineering Theory section is launching the “Question of the Day” activity, aimed at helping everyone reinforce their fundamental knowledge in chemical engineering. Subsequently, series such as “Principles of Chemical Engineering”, “Mass Transfer and Separation”, “Chemical Engineering Thermodynamics”, and “Chemical Process Technology” will also be introduced. We hope for your active participation! For replies to the “Question of the Day” activity, answers can be viewed directly; however, the thread will be closed after one day ! There is a 3 Wealth reward for participating, with an additional 3 Wealth awarded for correct answers. Multiple-choice question: In a counter-current absorption tower operating under normal conditions, if, for some reason, the liquid volume decreases and thus the liquid-gas ratio falls below the predetermined minimum value, which of the following situations will occur? ( ) A. The concentration of the liquid exiting the tower increases, and the recovery rate increases ； B. The concentration of gas exiting the tower increases, but xb? is uncertain ； C. Both the gas concentration and the liquid concentration at the outlet of the tower increase; D. Desorption occurs in the lower part of the tower. B
In a counter-current absorption tower operating under normal conditions, if, for some reason, the amount of liquid decreases and as a result the liquid-gas ratio falls below the predetermined minimum value, which of the following will occur? (C) A. The concentration of the liquid exiting the tower, xb, increases, and the recovery rate increases； B. The concentration of gas exiting the tower increases, but xb? is uncertain ； C. Both the gas concentration and the liquid concentration at the outlet of the tower increase; D. Desorption occurs in the lower part of the tower.
Answer choice: C. Both the gas concentration exiting the tower and the liquid concentration exiting the tower increase;
In a counter-current absorption tower operating under normal conditions, if for some reason the amount of liquid decreases such that the liquid-gas ratio falls below the predetermined minimum value, which of the following situations will occur? (C. Both the concentration of the gas leaving the tower and the concentration of the liquid leaving the tower increase; ) D. Desorption will occur in the lower part of the tower.
C、---------------------------------------------------------
C. Both the gas concentration at the outlet of the tower and the liquid concentration at the outlet increase;
In the last stage, as the liquid volume decreases while the amount of gas remains unchanged, the liquid concentration increases, leading to a supersaturated state of the liquid; as a result, precipitation occurs at the bottom.
B. The concentration of gas exiting the tower increases, but xb? is uncertain；
B. The concentration of gas exiting the tower increases, but xb? is uncertain；
In a counter-current absorption tower operating under normal conditions, if for some reason the amount of liquid decreases and as a result the liquid-gas ratio falls below the predetermined minimum value, which of the following situations will occur? (B)
In a counter-current absorption tower operating under normal conditions, if, for some reason, the amount of liquid decreases and as a result the liquid-gas ratio falls below the predetermined minimum value, which of the following will occur? (C) A. The concentration of the liquid exiting the tower, xb, increases, and the recovery rate increases； B. The concentration of gas exiting the tower increases, but xb? is uncertain ； C. Both the gas concentration and the liquid concentration at the outlet of the tower increase; D. Desorption occurs in the lower part of the tower.