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H 2 O is used to scrub HCHO ( formaldehyde ) from a waste gas stream in an absorption column. The waste gas contains 5
is used to scrub HCHO formaldehyde from a waste gas stream in an absorption column. The waste gas contains HCHO and and is at The ratio of water to waste gas flow rates is :
The waste gas is fed into the bottom of the absorption column and meets a counter current stream of entering the top of the column at The scrubbed leaves the top of the column at
i What is the flow rate of the HCHO solution leaving the base of the column? Assume that all the HCHO is scrubbed from the waste gas and dissolves in the water.
ii What is the temperature of the HCHO solution which leaves the base of the column?
Hints: Assume datumreference temperature as
Energy in Energy out Accumulation,
Energy Stream flow rate Specific heat Change in temperature
Where accumulation could be a heat of reaction or heat of solution
Data
Specific heat of gas
Specific heat of HCHO gas
Specific heat of liquid
Specific heat of HCHO solution
table
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