Question

A multiple stage evaporator concentrates a weak NaOH solution from 3% to 18% and processes 2...

A multiple stage evaporator concentrates a weak NaOH solution from 3% to 18% and processes 2 tons of solution per day. How much product is made per day? How much water is evaporated per day?

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Answer #1

Given:

concentration of NaOH in Feed = 3 % = 0.03 Feed

Concentraion of NaOH in product = 18 % = 0.18 Product

Given Feed = 2 tons = 2000 Kg

Applying species balance for NaOH to given system

0.03 feed = 0.18 Product

0.03 * 2000 Kg = 0.18 * Product

Product = 60 / 0.18 = 333.33 Kg

applying mass balance over whole system

Feed = Product + water evaporated

2000 Kg = 333.33 + water evaporated

water evaporated = 2000 - 333.33 = 1666.67 Kg

So answer is Product made per day =333.33 Kg

water evaporated per day = 1666.67 Kg

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