10. A scrubber is a unit operation used to 'scrub' (remove) undesirable components from a gas st

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10. A scrubber is a unit operation used to 'scrub' (remove) undesirable components from a gas stream. Contaminated gas (stream 1) is fed in at the bottom of the device, rises through the unit and emerges from the top as cleaned or 'scrubbed' gas (stream 2). "Scrubbing liquor", which is liquid used to scrub the gas, flows in the opposite direction to the gas (stream 3), removing the contaminating component as it flows down the unit (stream 4). In a particular application, methane gas contaminated with 500 ppm $H_2S$ (by mass) is fed to a scrubber. The flow rate of the gas stream is 100 kg/min. The concentration of $H_2S$ in the scrubbing liquor exiting the scrubber is measured at 0.5 wt%. a) What is the flow rate of scrubbing liquor if it enters the scrubber at 0% $H_2S$? b) What is the flow rate of the scrubbing liquor if it now enters the scrubber at 0.47 mass% $H_2S$? c) Assume the scrubber can only take a liquor flow rate of 230 kg/min and it enters at 0.1 mass% $H_2S$. The flow rate of $H_2S$ in the exiting liquor is 0.27 kg/min. i. What will the scrubbing capacity of the scrubber be? Page 2 of 3

          10. A scrubber is a unit operation used to 'scrub' (remove) undesirable components from a gas stream.
Contaminated gas (stream 1) is fed in at the bottom of the device, rises through the unit and emerges
from the top as cleaned or 'scrubbed' gas (stream 2). "Scrubbing liquor", which is liquid used to scrub
the gas, flows in the opposite direction to the gas (stream 3), removing the contaminating component
as it flows down the unit (stream 4).
In a particular application, methane gas contaminated with 500 ppm $H_2S$ (by mass) is fed to a
scrubber. The flow rate of the gas stream is 100 kg/min. The concentration of $H_2S$ in the scrubbing
liquor exiting the scrubber is measured at 0.5 wt%.
a) What is the flow rate of scrubbing liquor if it enters the scrubber at 0% $H_2S$?
b) What is the flow rate of the scrubbing liquor if it now enters the scrubber at 0.47 mass% $H_2S$?
c) Assume the scrubber can only take a liquor flow rate of 230 kg/min and it enters at 0.1 mass%
$H_2S$. The flow rate of $H_2S$ in the exiting liquor is 0.27 kg/min.
i. What will the scrubbing capacity of the scrubber be?
Page 2 of 3

10. A scrubber is a unit operation used to 'scrub' (remove) undesirable components from a gas stream.
Contaminated gas (stream 1) is fed in at the bottom of the device, rises through the unit and emerges
from the top as cleaned or 'scrubbed' gas (stream 2). "Scrubbing liquor", which is liquid used to scrub
the gas, flows in the opposite direction to the gas (stream 3), removing the contaminating component
as it flows down the unit (stream 4).
In a particular application, methane gas contaminated with 500 ppm H2S (by mass) is fed to a
scrubber. The flow rate of the gas stream is 100 kg/min. The concentration of H2S in the scrubbing
liquor exiting the scrubber is measured at 0.5 wt%.
a) What is the flow rate of scrubbing liquor if it enters the scrubber at 0% $H2S$?
b) What is the flow rate of the scrubbing liquor if it now enters the scrubber at 0.47 mass% $H2S$?
c) Assume the scrubber can only take a liquor flow rate of 230 kg/min and it enters at 0.1 mass%
H2S. The flow rate of H2S in the exiting liquor is 0.27 kg/min.
i. What will the scrubbing capacity of the scrubber be?
Page 2 of 3

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