An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is ?
Correct answer: B. 4.605
- A. 9.21
- B. 4.605
- C. 100
- D. 0.001
Explanation
For irreversible reaction absorption, the gas-phase transfer-unit calculation reduces to the logarithmic concentration ratio: NOG = ln(10/0.1) = ln(100) = 4.605. The value 9.21 would incorrectly double this logarithmic change.
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