Question

Ex. 6: (Change of phase), using Cp to calculate Enthalpy A feed stream to a evaporation unit contains an equi-molar mixture of benzene and toluene at 10°C The vapour stream from the top of the evapoator contains 68.4 mol% benzene at 50 °C and the liquid stream from the bottom contains 40 mol% benzene at 50°C. Note: You need Cp (benzene, liquid), Cp (toluene, liquid), Cp (benzene vapour), Cp (toluene vapour), latent heat of vaporisation benzene, latent heat of vaporisation toluene.] From Tables of Benzene 1. liquid # 1.80 kJ/(kg) 2. Vapor 1.09 kJ/(kg.K) C of Toluene 1. liquid 1.720 kJ/kg.K) 2. Vapor- 1.126 kJ/(kg.K) Latent heats Latent heat of Benzene-309 k/kg Latent heat of Toluene-351 kJ/kg

Answer 1

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