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The liquid phase reaction A+BC follows an elementary rate law and occurs in a 1 m3CSTR. The inlet volumetric flow rate is 0.5m3min1 and the
The liquid phase reaction A+BC follows an elementary rate law and occurs in a 1 m3CSTR. The inlet volumetric flow rate is 0.5m3min1 and the entering concentration of A is 1M. The reaction occurs isothermally at 300K. For an equimolar feed of A and B, a 20% conversion is achieved. When the reaction is carried out adiabatically, the exit temperature is 350K and the conversion is 40%. The heat capacities of A,B, and C are 25,35 , and 60kJ/(molK), respectively and independent of temperature. It is proposed to add a 2nd ISTR of the same size, in series with the first CSTR. There is a heat exchanger attached to the 2nd CSTR with UA =4.0kJ/(minK), and the coolant fluid enters and exits the jacket at virtually the same temperature of 350K. Assume all reactors operate isobarically. a. What is the rate of heat removal needed for isothermal operation in the first CSTR? [Q=750,000kJ/min] b. What is the final conversion at the exit of the second reactor if the first reactor is operated isothermally? [X=0.4] c. What would the final conversion be if the second CSTR were replaced with a 1m3 PFR with Ua=10(kJ/(m3minK) and Ta=300K?[X=0.4] d. A chemist suggests that the reverse reaction cannot be neglected. From thermodynamics, we known that KC=2dm3/mol at 310K. What conversion can be achieved if the entering temperature to the PFR is part C is 300K and Ta= 300K ? You may assume that the first CSTR achieves a conversion of 0.2 for the problem. [X=0.3]
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