1000 kg'h of a dilute solution of sodium hydroxide containing 10% NaOH is to be concentrated...

 

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1000 kg'h of a dilute solution of sodium hydroxide containing 10% NaOH is to be concentrated to 40% N2OH by weight in a single effect evaporator. The feed is available at 25°C. Boiling Point of the solution may be considered as 100°C. If the overall heat transfer coefficient for the system is 850 W/(m' K), determine the following: (i) The quantity of water evaporated. (i) Steam consumed and steam economy. (ii) Surface area of the evaporator. (5 marks) (10 marks) (5 marks) Data: Specific heat of dilute solution = 4180 J(kg K) Latent heat of condensation of steam = 2212 kJkg Latent heat of vaporization of water = 2239 kJkg Saturated steam corresponding to 1.8 bar pressure and 117°C is available for heating purpose. PHT: BCHE February 2022 1000 kg'h of a dilute solution of sodium hydroxide containing 10% NaOH is to be concentrated to 40% N2OH by weight in a single effect evaporator. The feed is available at 25°C. Boiling Point of the solution may be considered as 100°C. If the overall heat transfer coefficient for the system is 850 W/(m' K), determine the following: (i) The quantity of water evaporated. (i) Steam consumed and steam economy. (ii) Surface area of the evaporator. (5 marks) (10 marks) (5 marks) Data: Specific heat of dilute solution = 4180 J(kg K) Latent heat of condensation of steam = 2212 kJkg Latent heat of vaporization of water = 2239 kJkg Saturated steam corresponding to 1.8 bar pressure and 117°C is available for heating purpose. PHT: BCHE February 2022

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