Question

Saturated process gas containing CO( 5 wt%), CO2(15 wt%) and H2( 80 wt%) on dry basis enters compressor at 40oC and 8 atm. The process gas is compressed to 30 atm. For 100 NM3 (on dry basis) of process gas
(a) Estimate the weight of water condensed if gas is compressed isothermally
(b) Estimate outlet temperature with 15 degrees of superheat and amount of water condensed.

Answer 1

1).

using ideal gas law for

now using isothermal process means at constant temperature we get

so initially P₁V₁ is given P1= 8 atm, V1= 100NM³   

after compression: P2= 30 atm, V2=?

now gas mixture is given wt% but isothermally no change of number of moles of gases

so let us use

So V₂= 26.6 NM³    

So condensed water is (100-26.6) NM³    

=73.4 NM³