Performance Metrics for Separation Processes

1 Performance Metrics for Separation Processes

$n_{i,k}^{(F)}$ = mass or molar flow rate of species $i$ entering separator $k$ in feed stream (mass time^-1 or mol time^-1)

$n_{i,k}^{(1)}$ = mass or molar flow rate of species $i$ leaving separator $k$ in first product stream (mass time^-1 or mol time^-1)

$n_{i,k}^{(2)}$ = mass or molar flow rate of species $i$ leaving separator $k$ in second product stream (mass time^-1 or mol time^-1)

${\rm SF}_{i,k}$ = split fraction for species $i$ in separator $k$ (dimensionless)

${\rm SR}_{i,k}$ = split ratio for species $i$ in separator $k$ (dimensionless)

(1.1) $\begin{displaymath} {\rm SF}_{i,k} = n_{i,k}^{(1)}/n_{i,k}^{(F)} \end{displaymath}$

(1.2) $\begin{displaymath} {\rm SR}_{i,k} = n_{i,k}^{(1)}/n_{i,k}^{(2)} = {\rm SF}_{i,k}/(1-{\rm SF}_{i,k}) \end{displaymath}$

Example

For the process below, compute the split fraction and the split ratio for iC₅H₁₂. Designate the overhead stream as product stream 1.

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