A 1 butanol acid solution is to be extracted with pure water The butanol solution contains 4 5 w t 4 5 w t of acetic acid and flows at the rate of 400 k g h 400 k g h A total water flow rate of 1005 k g h 1005 k g h is used Operation is at 298 K 298 K and 1 a t m 1 a t m For practical purposes, 1 b...

a To calculate the number of equilibrium stages required for a countercurrent cascade we can use the ...

A 1-butanol acid solution is to be extracted with pure water. The butanol solution contains 4.5 w

Question:

A 1-butanol acid solution is to be extracted with pure water. The butanol solution contains $4.5 w t %$ of acetic acid and flows at the rate of $400 k g / h$ . A total water flow rate of $1005 k g / h$ is used. Operation is at $298 K$ and $1 a t m$ . For practical purposes, 1-butanol and water are immiscible. At $298 K$ , the equilibrium data can be represented by $Y_{A i} = 0.62 X_{A i}$ , where $Y_{A i}$ is the weight ratio of acid in the aqueous phase and $X_{A i}$ is the weight ratio of acid in the organic phase.

(a) If the outlet butanol stream is to contain $0.10 w t %$ acid, how many equilibrium stages are required for a countercurrent cascade?

(b) If the water is split up equally among the same number of stages, but in a cross-flow cascade, what is the outlet acid concentration in the organic phase?

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