Suppose someone had used the false kinetics (i.e., wrong E, wrong n)? Would the catalyst weight be overdesigned or underdesigned? What are other positive or negative effects that occur?
Interpretation:
Whether the catalyst weight be overdesigned or underdesigned if false kinetics is used or not is to be stated. The other positive and negative effects of false kinetics are to be stated.
Concept introduction:
The effectiveness factor is the division of the average rate of the reaction with rate of reaction at the bulk-stream point that is at boundary conditions or without diffusion. It is denoted by
Answer to Problem 15.2Q
The catalyst weight will be overdesigned if false kinetics is used. The other positive and negative effects of false kinetics have been stated below.
Explanation of Solution
If kinetics like activation energy, number of moles is taken wrong then it is known as false kinetics. In case of decreased particle size, the activation energy and temperature of the reaction becomes higher. Due to this reason reaction becomes much more temperature sensitive. This causes the runaway reaction due to which explosion occurs.
These are effects of applying the false kinetics.
The weight of the catalyst is inversely proportional to the overall effectiveness and the rate constant according to the equation given below.
Where,
If the false kinetics is applied then the overall effectiveness becomes lower due to which rate of the reaction becomes higher which corresponds to the overdesigned catalyst weight.
The catalyst weight will be overdesigned if false kinetics is used. The other positive and negative effects of false kinetics have been stated above.
Want to see more full solutions like this?
Additional Engineering Textbook Solutions
Starting Out with C++ from Control Structures to Objects (9th Edition)
Management Information Systems: Managing The Digital Firm (16th Edition)
Computer Science: An Overview (13th Edition) (What's New in Computer Science)
Concepts Of Programming Languages
Java How to Program, Early Objects (11th Edition) (Deitel: How to Program)
Electric Circuits. (11th Edition)
- Water at 60° F is being pumped from a stream to a reservoir whose surface is 210 ft above the pump. The pipe from the pump to the reservoir is an 8-in Schedule 40 steel pipe 2500 ft long. The pressure at the pump inlet is - 2,36 psig. If 4.00 ft³/s is being pumped, a). Compute the pressure at the outlet of the pump. Answer: 0,997 MPa b). Compute the power delivered by the pump to the water. Answer: 151 hp Consider the friction loss in the discharged line, but neglect other lossesarrow_forward1. Consider a mixture of 2.5.0% ethane, 2.0% butane, and 1.7% n-pentane by volume.a. Estimate the LFL and UFL of the mixture. Is it flammable?b. Estimate the LOC for this mixture.arrow_forwardEstimate the LFL and UFL for propylene using Equations 6-10 and 6-11 in the textbook,and compare these to the experimental values given in the table in Appendix B.arrow_forward
- 1. Determine the minimum compression ratio required to raise the temperature of air overhexane to its AIT. Assume an initial temperature of 20°C.2. Ethanol is kept in a storage vessel that is vented with air (at 25°C and 1 atm). Is theequilibrium mixture of vapor above the liquid and air flammable? What if the liquid isacetone instead?arrow_forwardHydrogenation of Ethylbenzene to Styrene Reaction: C₈H₁₀ → C₈H₈ + H₂ΔHᵣ°(300°C) = -124 kJ/mol (exact value unknown) Process Description: The basis is 1000 kg/h of separated styrene. The reaction conversion rate is 35%. The temperature increase in heat exchanger 2 is adiabatic. A fresh stream of pure ethylbenzene (25°C) enters a mixing vessel, where it is combined with a recycle stream (from the distillation column, as explained later), which also consists of pure ethylbenzene at 25°C. After mixing, the stream is sent to a heat exchanger (HX1), where the mixture is heated to 200°C. Next, the mixture enters an adiabatic heat exchanger (HX2), where it is further heated to 300°C by adding steam (at 350°C). This steam is used to prevent side reactions and carbon deposition in the reactor. The heated mixture is then fed into the reactor, where the reaction takes place with a conversion rate of 35%. As a result, the mixture cools down to 260°C. The resulting mixture is then sent to HX4, where…arrow_forwardChemical Engineering Questionarrow_forward
- 4.16 aarrow_forward8. The thermal decomposition of nitric oxide at elevated temperatures 2NO → N₂+02 has been studied in a batch reactor where at temperatures below 2000K the rate expression that applies to low conversions is: r = kCm05 Co At high conversions, or when the initial mixture contains a high concentration of O2 the rate expression is given by: r = k' Cм0.5 C15C0,5 To explain these kinetics the following chain reaction mechanism has been proposed: Initiation: Propagation: 2NON₂O +0 k₂ E1=272.0 kJ/mol 0+ NO O₂+ N E₂-161.0 kJ/mol N+NO N₂+0 E3-1.4 kJ/mol K4 20+ MO₂+M E4=14.0 kJ/mol ks Termination: where M is any molecule capable of the energy transfer necessary to stabilize the oxygen molecule. Once appreciable amounts of O2 are present in the reaction mixture, the initiation reaction that is the primary source of atomic oxygen is no longer the first reaction. Instead, the following reaction begins to dominate the chain initiation process: Initiation (high O2): ks NO +0₂ NO₂+0 E5=198.0 kJ/mol a.…arrow_forward2:41 2) If the number-average degree of polymerization for styrene obtained by the bulk polymerization at 25°C is 5,000, what would be the number-average degree of polymerization if conducted in a 10% solution in toluene (900g of toluene per 100 g of styrene) under otherwise identical conditions? State any assumptions that are needed. (see Table 2-4). Table 2-4 Representative Values of Chain-Transfer Constants Monomer Styrene Chain-Transfer Agent T (°C) C x 104 Styrene 25 bas 0.279 * 50 0.35-0.78 Polystyrene 50 1.9-16.6 Benzoyl peroxide 50 0.13 Toluene 60 0.125 Methyl methacrylate Methyl methacrylate 30 0.117 70 0.2 Poly(methyl methacrylate) 50 0.22-1000 Benzoyl peroxide 50 0.01 Toluene 40 0.170 3) 2 3) Methyl methacrylate is copolymerized with 2-methylbenzyl methacrylate (M₁) in 1,4- dioxane at 60°C using AIBN as the free-radical initiator. (a) Draw the repeating unit of poly(2-methylbenzyl methacrylate). (b) From the data given in the table below, estimate the reactivity ratios of…arrow_forward
Introduction to Chemical Engineering Thermodynami...Chemical EngineeringISBN:9781259696527Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark SwihartPublisher:McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind...Chemical EngineeringISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY
Elements of Chemical Reaction Engineering (5th Ed...Chemical EngineeringISBN:9780133887518Author:H. Scott FoglerPublisher:Prentice Hall
Industrial Plastics: Theory and ApplicationsChemical EngineeringISBN:9781285061238Author:Lokensgard, ErikPublisher:Delmar Cengage Learning
Unit Operations of Chemical EngineeringChemical EngineeringISBN:9780072848236Author:Warren McCabe, Julian C. Smith, Peter HarriottPublisher:McGraw-Hill Companies, The