Question

A 100 Kg liquid solid mixture with 10% solid and 90% liquid is input to a dryer, if the amount of evaporated water is 60% of the amount of input, what is the amount of liquid in the product?

(a) 10 Kg

(b) 20 Kg

(c) 30 Kg

(d) 40 Kg

The question was posed to me in my homework.

My query is from Solving Material Balance Problems for Single Units topic in section A General Strategy for Solving Material Balance Problems and Solving Material Balance Problems for Single Units of Basic Chemical Engineering

Answer 1

Correct answer is (c) 30 Kg

To elaborate: Let the amount of liquid in the product be x. Liquid balance: 0.9(100) = 1(60) + x, => x = 30 Kg.