7. Steam drive

If the least volatile product is available in vapor form, the boiler can be replaced by a V ₀ flow of this vapor injected at the bottom of the column. In the majority of cases, these are distillations where water is the least volatile body.

The balances of the depletion section are modified (figure 9 a): $\begin{array}{l} R_{j + 1} - V_{j} = E - V_{0} = Δ^{'} \\ R_{j + 1} X_{j + 1} - V_{j} Y_{j} = E X_{E} = Δ^{'} X_{Δ^{'}} \\ R_{j + 1} h_{j + 1} - V_{j} H_{j} = E h_{E} - V_{0} H_{V_{0}} = Δ^{'} h_{Δ^{'}} \end{array}$

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References

(1) - MacCABE (W.L.), SMITH (J.C.) - Unit operations of chemical engineering - . 1993 (5e ed.) MacGraw-Hill.
(2) - PERRY (J.H.) - Chemical Engineer's Handbook - . 1998 (7e ed) MacGraw-Hill.
(3)...

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