Which evaporators can be used when a low degree of concentration is required?

[Ngô Thị Vân]

Which evaporators can be used when a low degree of concentration is required?
A. Falling film evaporator
B. Circular type evaporator
C. Tubular type evaporator
D. Plate type evaporator

 

[Nguyễn Tuấn Dương]

Answer: b
Explanation: Circulation evaporators can be used when a low degree of concentration is required or when small quantities of product are processed. In yogurt production, for example, evaporation is utilized to concentrate milk 1.1 to 1.25 times, or from 13% to 14.5% or 16.25% solids content respectively. This treatment simultaneously de-aerates the product and rids it of off-flavors.