Example (ABSORBER)

• Problem statement: CO2 is absorbed into propylene carbonate in a packed column. The inlet gas stream is 20 mol% CO2 and 80 mol% methane. The gas stream flows at a rate of 7200 m3/h and the column operates at 60 °C and 60.1 atm. The inlet solvent flow is 2000 kmol/hr. Use HYSYS to determine the concentration of CO2 (mole %) in the exit gas stream, the column height (m) and the column diameter (m).

Componet tab>Add

Select your components in Match

Select Sour PR>Enter to Simulation Environment

Enter simulation Environment

Select the Absorber icon from the pallet and click

inside the simulation environment

Double click on the absorber and file in the inlet stream and exit streams as in the yellow area

Click Next> fill in top and bottom pressure 60.1 atm

Click next and fill in the top and bottom stage temperature

Close the absorber column Input Expert menu, notice that the stream are light blue

Double click on inlet gas stream and solvent stream and fill the temperature, pressure and composition

The solvent stream is fully specified

Gases in

• The other inlet stream “Gases In” should also be defined in a similar way. For the “Gases In” stream, enter the composition as methane - 0.8, CO2 - 0.2 & propylene carbonate - 0. Specify Molar Flow as 7200 m3/s (Note that HYSYS will convert the flow rate to kgmole/h as indicated in figure 7d). See to that the “Gases In” stream also changes to dark blue in color.

Click on the Gas in stream and enter T, P, Composition and flow rate

Conditions

Double click on the column, Run

Conversed

The absorber is ready

Calculate Diameter and height?

• Tools>Utilities

Tray sizing

Click on Add Utilities

Double click on tray Sizing

Click on Select TS

Select TS-1> OK

Click on Auto Section