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Aspen Problems Sheet I 1. Mixer-Splitter A 100 kg/hr stream of benzene at 35oC and a 200 kg/hr stream of toluene at 50oC are mixed in a mixer. The stream leaving the above mixture is split into two streams with the split fraction of 0.4. Determine the flowrates, composition and temperature of the

streams leaving the splitter. 2. Separation unit A mixture of benzene and toluene is separated using a single stage separation unit. Feed enters at 800C and 2 atm with a flowrate of 100 kmol/hr having 0.8 mole fraction of benzene. 80 % of benzene entering and 20 % of toluene entering are recovered into the bottom product. separator 3. Flash separator An equimolar mixture (100 kg mole /hr) of methanol and water at 180 oF and 20 psi is flashed adiabatically at 1 atm. Determine the fraction of methanol in the vapour stream leaving the flash. 4. Absorption column In an experiment, 33.8 kmol of ammonia-air mixture per hour is scrubbed continuously using water entering at a flow rate of 1781 kmol/hr in counter-current mode in a 6 plate absorption column. The gaseous mixture contains 25% ammonia by volume and is admitted at 30oC and 1 atm pressure into the tower. Determine the composition of the gaseous and liquid stream leaving the absorber. 5. Extraction column 100 kg/sec of an acetic acid-water solution containing 30% acid is extracted in a counter current 6 plate extractor with 40 kg/sec of isopropyl ether as the solvent. Determine the composition of the extract and raffinate phases leaving the column. 6. Distillation column A 36 % methanol-water mixture flowing at 216.8 kmol/hr is distilled at 58.30C and 1 atm in a tray distillation column. 98.9% of methanol and 5.17 % of water are recovered with a reflux ratio of 0.908. Determine the number of stages, feed stage, reboiler duty and condenser duty. Determine the flowrate and composition of streams leaving the

7. Heat

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