Question 2: A liquid stream of 21000 kg/h consisting of 8.5 wt% Acetone (C3H60), 4.8 wt% Butenone (C4H60), 0.7 wt% Metha

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Question 2 A Liquid Stream Of 21000 Kg H Consisting Of 8 5 Wt Acetone C3h60 4 8 Wt Butenone C4h60 0 7 Wt Metha 1 (130.83 KiB) Viewed 43 times

Question 2 A Liquid Stream Of 21000 Kg H Consisting Of 8 5 Wt Acetone C3h60 4 8 Wt Butenone C4h60 0 7 Wt Metha 2 (112.16 KiB) Viewed 43 times

Question 2: A liquid stream of 21000 kg/h consisting of 8.5 wt% Acetone (C3H60), 4.8 wt% Butenone (C4H60), 0.7 wt% Methacro lein (C4H60), 25 wt% 2-Methyl-2-butanol (CsH120), 3.5 wt% Diacetyl (C4H602), 6.5 wt% Acetylacetone (C3H302) and 51 wt% 2-Butanol (C4H100) enters to a distillation column at 70 °C and 1 atm. The distillation column has 50 stages with a Distillate to Feed Mass Ratio of 0.6. The feed enters at 'above stage' 18. Feed basis for this problem is Acetone. The pressure of the condenser located at top of distillation column is 1 bar. At the condenser, the product is withdrawn in liquid phase. The condenser type is 'total' and the reboiler is ‘kettle'. The property method for this simulation is Peng-Robinson and consider a rigorous distillation column in the simulation. Tasks: (A) The Reflux Mass Ratio is unknown. Perform a Design Spec analysis and determine the Reflux Mass Ratio for achieving Acetone composition of around 95 wt% in the light product. (B) Deactivate previous Design Spec. Introduce a Reflux Mass Ratio of 4.8 and distillate to feed mass ratio of 0.5. Determine the mass concentration of acetone in light products. (C) Following the simulation (B), you would like to provide specifications of condenser and reboiler heat duties to a supplier and you are considering to include a safety factor. Last three digits of your student number Safety factor, Spistillation = 1 + 1000 Apply a safety factor value with three decimal places in the calculation. Report the specifications of condenser and reboiler heat duties in kW.
Now extend the process flowsheet by adding a pump, a heat exchanger, a valve and a tank. In this case, the 2- butanol rich bottom product stream of the distillation column enters to the pump. The discharge pressure of pump is 1.5 atm and it has a suction area of 0.7 sqin. The 2-butanol rich pump outlet stream is cooled by a heat exchanger. The cooling fluid for the heat exchanger is a blended refrigerant. This blended refrigerant consists of 53 wt% R-143A (C2H3F3), 43 wt% R-125 (C2HFs) and 4 wt% R-134A (CH_F_). The cooling fluid has a flow-rate of 34000 kg/h and it enters the heat exchanger at the ambient conditions and discharges at 50 °C. The cooled 2-butanol rich liquid stream from the heat exchanger enters to a globe valve where the pressure of the stream reduces to 1 atm. The manufacturer of the valve is Neles-Jamesbury with the series of V810_Equal_Percent_Flow and a size of 2 in. The outlet stream of the valve enters to a tank and finally delivers from the tank to the next chemical processing unit. Task: (D) Now perform a sensitivity analysis to find out the required mass flow-rate of blended refrigerant for achieving a stream temperature of 60 °C in the 2-butanol rich liquid stream at the heat exchanger outlet.