An oil company wishes to synthesize the substances A4 and A5 due to its forecasts of a high increase in demand. Both sub

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An Oil Company Wishes To Synthesize The Substances A4 And A5 Due To Its Forecasts Of A High Increase In Demand Both Sub 1 (164.14 KiB) Viewed 42 times

An oil company wishes to synthesize the substances A4 and A5 due to its forecasts of a high increase in demand. Both substances can be synthesized from other species produced in one of its petrochemical plants, according to the following reaction schemes: -4000 m 4+4, 2.4, 1 = k cuc k, = 5-10° exp T kmol-seg -9000 A 34 1 =k.cz kg = 8-10° exp seg T In the petrochemical plant, 10 kmol/sec of pure A3 is available, totalizing a current with a QV (volume flow rate) of 5 m3/sec. However, A1 and A2 are not available separately, but rather an equimolecular current of both, with a flow rate of 25 kmol/sec. Since A1 is much more volatile than A2 (mean relative volatility 3.6), it was suggested to install a rectification column, so that a distillate with 95% A1 and a residue with 90 mol% A2 could be obtained, which are the minimum requirements to carry out the two synthesis reactions of the desired substances. The A4 synthesis reaction is thought to be carried out in an isothermal CSTR at 95 °C using the distillate mixture from the column mixed with the A3 stream as feed. On the other hand, the pyrolysis of A2 is carried out in an PFR (plug flow tubular reactor), using the column residue mixture as feed, after vaporizing it, operating at 300°C and 0.2 atm to avoid secondary reactions. It is desired to obtain a conversion of 95% in both reactions. Determine: 1. The flow rate of the streams leaving the distiller (2 and 3). 2. The composition of the mixed stream (6) 3. The volume of the CSTR, where reaction 1 takes place. 4. The volume of the PFR, where reaction 2 takes place. Data and notes Assume that the species that do not take part in the reactions behave as inert. The molar density of mixtures A1-A2 can be considered practically constant and equal to 12 kmol/m3 It is assumed that the food will be introduced into the column as a liquid at the boiling temperature, and that it operates with a reflux ratio equal to 1.5 2 PFR Dest. 3 5 6 M CSTR