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In an absorption tower (or absorber), a gas 13 contacted 1soth a hquld under CGﬂdltanS such that one or more species in the gas dissolve in the liquid. A stripping tower (or stripper) also involves a gas
contacting a liquid, but under conditions such that one or more components of the feed liquid co e
out of solutiou and exit in the gas leaving the t wer. £44 A process consisting of an absorption tow r and a stripping tagger is used to SKEW the com— I
ponents of a gas containing 30.0 mole% carbon dioxide and the balance methaﬁé. stream of this gas is fed to the bottom of the absorber. A Equid conta mug . mo e% dissolved CO; and the my «L
balance methanol is regs-led from the bottom of the stripper and fed to the top of the absorber.
t e The product gas leaving top of the absorber contains 1.00 mole% C02 and essentiall all of the 97,. n/
5% methane fed to the unit. The COz-rich ﬁguid solvent leavmg the bottom of the a sorher is fed to the 1 _ WW stream of nitrogen gas is fed to the bottom. Ninet ercent of the C02 in
the liquid feed to the stripper comes out of solution in the column, and the nitrogenfCOz streade-A "WK
leaving the column passes out to the atmosphere through a stack. The liquid stream leaving the'lnshsrw
stripping tower is the 0.500% CO; solution recycled to the absorber. The absorber operates at temperature T3 and pressure P, and the stripper operates at T3 and
PS. Methanol may be assumed to be nonvolatile—that is, none enters the vapor phase in either
column—and N2 may be assumed insoluble in methanol. ...
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- Spring '08
- Mass Balance