For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is

Related MCQs

• It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is
• A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because
• A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
• For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in
• Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.
• For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is
• In a multiple effect evaporator, the effect of boiling point elevation is to
• For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator.
• For hot feed, forward feeding as compared to backward feeding results in __________ economy.
• Multiple effect evaporation accounts for