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Benzene is being stripped from a coal seam gas by using countercurrent gas absorption with a wash oil in a packed column. The inlet gas
Benzene is being stripped from a coal seam gas by using countercurrent gas
absorption with a wash oil in a packed column. The inlet gas contains vol
benzene and this must be reduced to vol before the gas can be supplied to the
consumer. The wash oil enters the absorber containing mol benzene. The
absorber has a diameter of and operates at a constant pressure of kPa and
temperature of The coal seam gas enters the column at this temperature and
pressure and with a total flowrate of You may assume dilute solutions and
that the gas phase behaves as an ideal gas.
The individual mass transfer coefficients have been determined as:
skPa
Oil Density
Oil Molecular Weight
Ideal Gas Constant,
An equilibrium diagram of the benzene solubility in the wash oil is attached as Figure
a What is the minimum amount of oil required in
marks
b The actual oil flowrate is determined to be While operating at this
flowrate, you measure a bulk gas phase concentration as vol benzene at one
point in the column. Determine the mol fraction of benzene the bulk liquid phase
at this point and the corresponding interfacial mol fractions of both the gas and
liquid phases.
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