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A catalytic process uses a catalyst which must be regenerated periodically because of reduction in conversion efficiency. The cost for one regeneration is constant at $800. This figure includes all shutdown and startup costs, as well as the cost for the actual regeneration. The feed rate to the reactor is maintained constant at 150 lb/day, and the cost for the feed material is $2.50 per pound. The daily costs for operation are $300, and tixed charges plus general overhead costs are $100,090 per year. Tests on the catalyst show that the yield of product as pounds of product per pound of feed during the first day of tgeration with the regenerated catalyst is 0.87, and the yield decreases as 0.87/(θD)0.25, where θD, is the time in operation expressed in days. The time necessary to shut down the unit, replace the catalyst, and start up the unit is negligible. The value of the product is $14.08 per pound, and the plant operates 300 days per year. Assuming no costs are involved other than those mentioned, what is the maximum annual profit that can be obtained under these conditions?
A 25 wt% solution of coffee in water at 70°F is spray dried to a final moisture content of 5% (dry basis) with air that enters at 450°F and 1 atm with a humidity of 0.01 lb/lb (dry basis) and exits at 200°F. Assuming a reasonable value for the spe..
If the mass percent of vanadium in the ore was 58.1%, what was the mass of the ore sample? Which of the four transition metal ions in this titration has the highest oxidation state?
Assume that an As i mplant leads to a uniform electron concentration of 1019 cm·3 down to a depth of 0.1 µm and a mobility of 100 cm2 .V1 .s·1 . Determ ine the resistivity and the sheet resisti vity of the implanted layer.
A rigid container has water of 2 kg at 120 C with a quality of 25%. The container is heated to the temperature of 140 Celsius, calculate the new quality?
question 1a outline the provisions of occupational safety and health act 2005 with regard to substances hazardous to
A flow process produces work using water as the working medium. The process is as follows: steam of quality 50% at 1 bar is compressed adiabatically to 20 bar; is heated isothermally by absorbing 3500 kJ/kg of heat; is expanded adiabatically to an..
A flat slab of Douglas fir wood 50.8 mm thick containing 30 wt% moisture is being dried from both sides (neglecting edges and ends). The equilibrium moisture content at the surface of the wood due to the drying air blown over it is held at 5 wt% mois..
Suppose that R2 is decreased to 0.5 min/ft2. Compare the old and new values of the ultimate gain and the critical frequency. Would you expect the control system performance to become better or worse, justify your answer.
Fraction of filtering area submerged in the slurry = 0.2 r/min = 2
What is a Recycle reactor?In some reaction system, it is advantageous to divide the product stream and a partreturned to reactor as recycle to increase the conversion rate. These reactors are calledrecycle reactors.
A fresh feed stream containing 4.0 mol% inert gas and a stoichiometric ratio of hydrogen and nitrogen is combined with a recycle stream and is fed to a system to produce ammonia according to the reaction: N2 + 3H2 = 2NH3
Describe the principles of a vapour adsorption refrigeration system, and compare this to a vapour recompression system. Which of the two systems is more suitable for refrigeration processes in a brewery or distillery and why?
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