Task $5$: Absorption $(10$P$)$

Biogas consists of the following compounds: methane, carbon dioxide, nitrogen, oxygen $($see table$).$

Before Biogas is fed to the natural gas pipeline, carbon dioxide has to be removed from the stream of

gas down to a loading of $Y_{,CO2}=0\mathrm{.}06mo\frac{l}{m}ol.$ The removal of carbon dioxide is carried out with

absorption process using an ionic liquid $($IL$)$ as absorption media. The absorption media after the

desorber holds a residual load of $x_{,CO2}=0\mathrm{.}025mo\frac{l}{m}ol$ before entering the absorption column.

Additionally assume that only carbon dioxide is absorbed$.$

Composition of biogas:

e$)$ Draw a flow chart for the scrubbing of flue gas with all relevant streams and loads $($absorption

and following desorption$).(3$P$)$

f$)$ Determine the minimum stream of absorbent media. The volumetric flow rate of the carrier gas

stream is $G_0^{}=150$kmo$\frac{l}{h}.(2$P$)$

g$)$ Determine the number of theoretical stages for the absorption process. The real solvent ratio is

two times the minimum solvent ratio. $(3$P$)$

h$)$ The IL is to be regenerated with a pure stripping agent. Draw a possible operating line

$("$Arbeitsgerade$")$ for the desorption process as a dashed line in the given load diagram. $(2$P$)$