Why do we use Single effect evaporators when we already have multiple

1.	Why do we use Single effect evaporators when we already have multiple effect one?
A.	To have liberty to use fouling liquids
B.	To create low pressure
C.	To have large temperature
D.	To have higher efficiency with cheap material
Answer» B. To create low pressure

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If we have a feed flow rate of 30kg/hr at 25℃ then what should be the heating steam rate if we wish to evaporate 4kg of water from the dilute solution in an hour?Latent heat of vaporization of water = 2,260 kJ/kgSpecific heat capacity = 6 KJ/Kg K
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Why do we use Single effect evaporators when we already have multiple effect one?

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