The off gas from a boiling water nuclear power reactor contains a wholevariety of radioactive trash, one of the most troublesome being Xe-133(half life = 5.2 days). This off gas flows continuously through a large holduptank in which its mean residence time is 30 days, and where we can assumethat the contents are well mixed. Find the fraction of activity removed inthe tank.A specific enzyme acts as catalyst in the fermentation of reactant A. At agiven enzyme concentration in the aqueous feed stream (25 liter/min) findthe volume of plug flow reactor needed for 95% conversion of reactantA (CA02 mol/liter). The kinetics of the fermentation at this enzymeconcentration is given byAenzymeR,-A=0.1 CA1+0.5 CAmolliter.min

Soultion 1; A -----> B given, half time, t1/2 = 5.2 days mean residence time,t = 30 days

Answered: The off gas from a boiling water…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Using RCRA procedures, determine if the following are classified as hazardous wastes. State the reason why or why not is is hazardous. If it is a hazardous waste, state the RCRA waste category number. Assume that the industry porducing the waste is a RCRA hazardous waste generator. 1. Sawdust in a warehouse contaminated by a spill of pentachlorobenzene. 2. Sludge from the treatment of water from the chemical conversion coating of aluminum. 3. An aqueous industrial waste stream from a plastic manufacturing plant that is discharged to a river.
Which among the following is FALSE for distillation equipment? a. A flash drum operates at lower pressures to vaporize the more volatile component. b. Partial condensers operate with vapor-liquid equilibrium. c. Total condensers yield reflux and distillate streams that have composition similar to the incoming saturated vapor. d. Partial reboilers yield a liquid stream that is recycled back to the distillation column.
A 1000 m3 lake is found to be contaminated with TCE (trichloroethane) that is potentially toxic to organisms. The concentration of TCE is 1.5 mg/L under steady-state conditions. Assume the lake behaves as a CSTR (completely stirred tank reactor). The decay of TCE is a first-order reaction with the rate constant of 2×10-6 s-1. If the source of TCE is closed off and the lake is to be flushed with clean water at a rate of 0.15 m3/s, how long will it take to lower the TCE concentration to 0.15 mg/L? Hint: You need to write the mass balance equation (VdC/dt=input rate-output rate-reaction rate) for this flushing (dilution) process and derive the concentration over time. The reaction rate for the first order kinetics is dC/dt= -kCV, where C is the pollutant concentration in the lake, t is the time, V is the lake water volume and k is the reaction rate constant. Group of answer choices A. 3 h B. 4.2 h C. 5.3 h D. 6.4 h
Powerplant cooling water with a temperature of 35 °C and a flowrate of 10 m3/s is discharged into a river with a temperature of 10 °C and a flowrate of 50 m3/s.a) What will the new temperature of the river be downstream of the mixing point? Draw and label your figure and state any assumptions.b) Using your knowledge of Henry’s law to justify your answer, how will this change in river temperature influence the amount of oxygen gas dissolved in the water?
In a batch reactor, a substance A was processed, which generated different products (D and U), through competitive parallel reactions with the following reaction kinetics: After 20 minutes of reaction, it was determined that the composition of the reaction medium was CA = 1 mol/L, CD = 5 mol/L, CU = 2 mol/L. The option that indicates, respectively, the instantaneous and global selectivities at the end of the reaction are: A) 3 and 2. B) 2.5 and 2. C) 2 and 3. D) 2 and 2.5.
E-h please
The elementary gas-phase reaction A → 3B is carried out in a cylindrical batch reactor divided by a thin metallic membrane into two compartments of equal volume, as shown in the figure below. Pure A Pure I Initially one side is filled with pure 'A', and the other with an inert gas T. Both sides are at the same pressure (1 atm.), the same temperature, and contain the same number of moles. The reaction is carried out isothermally and the rate constant for the reaction is 0.1 min. a. After 10 minutes the membrane ruptures. What is the pressure differential rating of the membrane? What is the conversion at this time? b. If the mixture continues to react after the membrane is ruptured, how much longer does it take for the conversion to reach 90% (based on the initial moles of A)? c. Sketch the pressure versus time behavior for the entire duration. Mark all the important values on your diagram. HINT; Note that in each phase (before and after rupture) the reaction is occurring in a constant…

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