Question

What is the important factor which is employed for heat sensitive materials in an evaporator ?

(a) High pressure

(b) Vacuum

(c) High residence time

(d) High temperature

I had been asked this question in final exam.

I want to ask this question from Evaporation of Heat Sensitive Materials topic in portion Evaporation of Food Processing Unit Operations

Answer 1

Correct option is (b) Vacuum

The explanation is: Under short residence time, the contact between product and evaporator is less and the low pressure creates vacuum where the boiling point is also reduced therefore there is no degradation of heat sensitive materials.