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Consider the absorber - stripper system illustrated on the next page. The feed containing 3 0 % C O 2 , 1 0 % H

Consider the absorber-stripper system illustrated on the next page. The feed containing 30%CO2,10%H2S and
an inert gas (I) is scrubbed of H2S and CO2 by using a solvent to selectively absorb the H2S and CO2. The resulting
stream (5) in which the pressure is reduced, and as a result some of the CO2,H2S and some
of the solvers ar soparaded as an overhead stream (6). The remaining solution is split, with half being returned
to the absorber and half to the stripping unit. In the stripping unit, the pressure is reduced further, resulting in an
overhead stream (10) comprising 30% solvent and an unknown amount of CO2 and H2S. The bottoms stream from
the stripper (9), comprising pure solvent, is recycled back to the absorber after mixing with some additional pure
solvent which makes up for the solvent lost in the flash and stripper overheads. The absorber is operated so that
the outlet overhead stream (2) from the unit contains no H2S and only 1%CO2. The stripper feed solution (8)
contains 5%CO2 and the overhead from the flash (6) contains 20% solvent. Finally, the flash is operated so that
25% of the CO2 and 15% of the H2S in stream (1) are released in the overhead (6).
Using degree-of-freedom analysis, determine the solution order, and solve for all of the unknowns (assuming feed
{:m1=100kgh). All percentages are on a mass basis.
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