Question

Q.1 Iso-octane (a gasoline blend) can be produced by the reaction: C4H8 (Butene) + i-C4H10 (isobutane) > C&H18 (iso-octane) The reaction takes place in the liquid phase at 45 F and 90 psia. The desired production of isooctane is 918 mol/h. One feed stream containing 80 mol% butene, 12% n-butane and 8% propane is mixed-in equi-molar ratio- with another stream containing 73 mol% isobutane, 15% n- butane and 12% propane. The mixed feed streams enter the reactor at 45° F and 90 psia, where 80% conversion of the limiting reactant takes place. The products leave the system at 20 psia and 80°F, at which conditions the isooctane is liquid, while the other products are in the gas phase. The prices of products and raw materials are as follows: Species Isooctane Butene Isobutane Mixed n-butane and propane Price, $/kg 2.1 1. Develop the BFD of the above process to a PFD. 2. Estimate EP1. Q.2 Consider the mixing process shown in Fig.Q.3.1 in which the concentrate is 33% HCL and the diluent is distilled water. It is required to produce 10% HCL by mixing the two streams in an agitated vessel. The outlet concentration of HCL is measured and controlled by manipulating the flow rate of the distilled water. The distilled water is added to the mixer via a centrifugal pump (not shown). The normal operation is continuous flow of distilled water through the valve. Perform a HAZOP on the distilled water flow to improve the safety of the process. Taking the flow of water as the parameter and LESS and MORE as guide words, construct the HAZOP work sheet. 5.0 1.8 1.1 FC Con contato PROCESS Diluent ac Fig. Q.3.1

Answer 1