rt $3$ "The separation stages from the process of part $2$ are to be redesigned, so that the C$2$H$4$Cl$2$ and the C$2$H$3$Cl$3$ are separated first in unit Sep #$1$ and leave as a mixed product stream $<4>.$ All of the remaining gases, C$2$H$4,$ Cl$2$ and HCl$,$ are recycled through an absorption unit $($Sep #$2),$ which selectively removes a fraction of the HCl$.$ The production rate of dichloroethane is to be maintained at $100,000$ te$/$y$.$ Using the information from Q$5,$ calculate the steady$-$state flowrates of HCl in the recycle before the absorber in kg$/$h$,$ for the cases where $($a$)$ All of the HCl in the stream $<5>$ is removed in the Sep #$2$ absorber $(4$ marks$)($b$)80\%$ of the HCl in stream $<5>$ is removed in the Sep #$2$ absorber $(4$ marks$)"$