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Question 1: What is the evaporation rate and yield of the sodium acetate hydrate CH3COONa.3H2O from a continuous evaporative crystalliser operating at 1 kN/m2 when
Question 1: What is the evaporation rate and yield of the sodium acetate hydrate CH3COONa.3H2O from a continuous evaporative crystalliser operating at 1 kN/m2 when it is fed with 1kg/s of a 50 per cent by mass aqueous solution of sodium acetate hydrate at 350K ? The boiling point elevation of the solution is 10 degK and the heat of crystallisation is 150kJ/kg. The mean heat capacity of the solution is 3.5kJ/kg.K and, at 1kN/m2, water boils at 280K at which temperature the latent heat of vaporisation is 2.482MJ/kg. Over the range 270305K, the solubility of sodium acetate hydrate in water s at T(K) is given approximately by: s=0.61T132.4kg/100kg water Molecular masses: CH3COONa.3H2O=136kg/kmol,CH3COONa=82kg/kmol
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