Question

A mixture containing 35 mole% n-butane and the balance isobutane at 10°C enters a heat exchanger at a rate of 24.5 kmol/h and at 1.96 bar pressure. The exchanger has been designed to heat and vaporize the liquid and heat the vapor mixture to 180°C. The heating fluid is a high molecular weight liquid with a constant heat capacity (Cp=2.62 kJ/kg C).It enters the exchanger at 215°C and flows countercurrently to the hydrocarbon mixture. According to the heat exchanger design calculations, the heating fluid exit temperature should be 45°C. What is the required mass flow rate of the heating fluid in (kg/h)? Hint: Assuming that the heat capacities and heats of vaporization of n-butane and isobutane are independent of pressure, the mixture vaporizes at 10°C (i.e. will not vaporize at respective boiling points as a pure component), and all the heat lost by the heating fluid is transferred to the hydrocarbon mixture

Answer 1

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