In a solvent manufacturing plant, a waste gas stream with a flowrate of

$85mo\frac{l}{s},$ contains $0\mathrm{.}04$mol fraction of toluene. The content of the

toluene in the waste gas stream must be reduced to $100ppm($mol$)$

prior to atmospheric emission.

a$.$ Condensation technique is used to achieve the above emission

limit$.$ Estimate the operating temperature for the condensation

unit to achieve the above emission limit$.$ Justify whether by

adding another condensation unit in series $($with similar

operating pressure and temperature$)$ could contribute to a lower

emission specification $($lower than $100ppm).$

$[10$ marks$]$

b$.$ Using adsorption technique, estimate the mass of the activated

carbon required $(kg)$ in order to remove ALL the toluene in the

waste gas stream. The activated carbon must operate

$14$ hours between the regeneration. Given that the regeneration

temperature and regeneration outlet concentration are $560K$

$(1008R)$ and $0\mathrm{.}04$ mole fraction, respectively. The data for the

saturation parameter calculation is provided in TABLE Q$2.$

TABLE Q$2$: Data for the saturation parameter calculation