An aqueous solution of ethanol $(40$mass$\%$ is to be enriched into a top product having $85$ mass $\%$ alcohol. The bottom product must not contain more than $6$ mass $\%$ alcohol. The feed is a saturated liquid and enters at a rate of $220$ kmo$\frac{l}{h}.$ The reflux ratio is $1\mathrm{.}3$ times the minimum reflux ratio. Calculate the number of ideal trays required using Ponchon Savarit method.

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