1. In CHEMCAD, T-X and X-Y diagrams can be generated by clicking on Chart, then on...

 

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1. In CHEMCAD, T-X and X-Y diagrams can be generated by clicking on Chart, then on TPXY, and then by filling out the dialog box. Use CHEMCAD to plot T-X and X-Y diagrams for the benzene (1)/toluene (2) system at 5 bar. Calculate and plot the T-X and X-Y diagrams using the following methods to determine K values. a. SRK b. UNIFAC c. NRTL. Submit an Excel spreadsheet summarizing all data (T-X and X-Y) and plots (T-X and X-Y). (10 points) 2. Determine the dew and bubble points of the following hydrocarbon mixture at 2 bar in CHEMCAD. (10 points) Component Propane N-butane N-pentane N-hexane Mole Fraction 0.20 0.20 0.50 0.10 3. A feed of 500 kmol/h of a four-component mixture is separated into three streams using two fractionation columns. The feed to the first tower is at 120 F and 14.7 psia. Cooling water is fed to the overhead condenser at 110 F and 100 psia saturated steam is available to heat the reboiler. Feed and product data are given below. Component (20 points) Product C Boiling Point Feed (mole %) Product A Product B (F) (mole %) (mole %) (mole %) 2-methylpentane 140.0 4.0 97.8 1.0 cyclohexane 177.4 32.0 2.2 49.0 toluene 231.1 32.0 48.2 2.0 m-xylene 282.2 32.0 1.8 98.0 (1). Develop a process flow diagram for separating this mixture into three required products in CHEMCAD. (Hint: evaluate the option of using a two-tower sequence). (2). Assume each tower has 75 actual stages and feed is introduced at stage 30. Which separation sequence for the two towers produces the lowest energy consumption? Submission of the CHEMCAD simulation file is required for this assignment. 1. In CHEMCAD, T-X and X-Y diagrams can be generated by clicking on Chart, then on TPXY, and then by filling out the dialog box. Use CHEMCAD to plot T-X and X-Y diagrams for the benzene (1)/toluene (2) system at 5 bar. Calculate and plot the T-X and X-Y diagrams using the following methods to determine K values. a. SRK b. UNIFAC c. NRTL. Submit an Excel spreadsheet summarizing all data (T-X and X-Y) and plots (T-X and X-Y). (10 points) 2. Determine the dew and bubble points of the following hydrocarbon mixture at 2 bar in CHEMCAD. (10 points) Component Propane N-butane N-pentane N-hexane Mole Fraction 0.20 0.20 0.50 0.10 3. A feed of 500 kmol/h of a four-component mixture is separated into three streams using two fractionation columns. The feed to the first tower is at 120 F and 14.7 psia. Cooling water is fed to the overhead condenser at 110 F and 100 psia saturated steam is available to heat the reboiler. Feed and product data are given below. Component (20 points) Product C Boiling Point Feed (mole %) Product A Product B (F) (mole %) (mole %) (mole %) 2-methylpentane 140.0 4.0 97.8 1.0 cyclohexane 177.4 32.0 2.2 49.0 toluene 231.1 32.0 48.2 2.0 m-xylene 282.2 32.0 1.8 98.0 (1). Develop a process flow diagram for separating this mixture into three required products in CHEMCAD. (Hint: evaluate the option of using a two-tower sequence). (2). Assume each tower has 75 actual stages and feed is introduced at stage 30. Which separation sequence for the two towers produces the lowest energy consumption? Submission of the CHEMCAD simulation file is required for this assignment.