A 50/50 mixture of 1-propanol and 2-propanol is separated by a continuous single-stage equilibrium flash tank. The liquid entering the tank is at 89.0°C. The tank operates at 80.00°C and 510.0 mmHg and both product streams emerge at these conditions. The vapor pressures of 1-propanol and 2-propanol are given by the Antoine equation and the mixture follows Raoult's law. Within the process conditions, the specific enthalpies of 1-propanol and 2-propanol are given in the equations below. Find the composition of the product streams, the moles in each product stream (using a 1 mole feed basis), and the required heat input, Q, by doing the following steps. How many unknowns are there in the above process flow diagram?
Which independent equations and balances can you write to solve for the process unknowns?
What is x1, the mole fraction of 1-propanol in the liquid product stream?
What is y1, the mole fraction of 1-propanol in the vapor product stream?
What is nL, the moles of liquid product?
What is nv, the moles of vapor product?
What is Q, the heat inputted into the flash tank? Consider the operating pressure of the flash tank, and its affect on the product streams. Is there a minimum operating pressure for the given inlet concentration and flash tank temperature? If so, what is this minimum operating pressure flash tank? Is there a maximum operating pressure for the given inlet concentration and flash tank temperature? If so, what is this maximum operating pressure?
The question belongs to Chemical Engineering and it discusses about calculation of mole fraction of propanol in liquid product stream and vapor product stream, the number of moles of liquid product and vapor product.
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