Cracking is a process in which large hydrocarbon molecules are broken up cracked into smaller, more valuable hydrocarbon molecules. The cracking of petroleum hydrocarbons was originally done by thermal cracking. Now, catalytic cracking offers a greater economic value than the gases produced by thermal cracking. Assume in a catalytic cracking regenerator, catalytic particles at 600°C are injected into air at 700°C in a fluidized bed. The specific heat of the particle is 1050 J/kg.°C, the density is 950 kg/m3, and the thermal conductivity is 5 W/m.°C. Assume the heat-transfer coefficient of air is 2700 W/m2.°C. Neglecting the chemical reaction, how long will it take for a 50-μm particle to be heated to 695°C? State the Figure or Equation used in your c
Cracking is a process in which large hydrocarbon molecules are broken up cracked into smaller, more valuable hydrocarbon molecules. The cracking of petroleum hydrocarbons was originally done by thermal cracking. Now, catalytic cracking offers a greater economic value than the gases produced by thermal cracking. Assume in a catalytic cracking regenerator, catalytic particles at 600°C are injected into air at 700°C in a fluidized bed. The specific heat of the particle is 1050 J/kg.°C, the density is 950 kg/m3, and the thermal conductivity is 5 W/m.°C. Assume the heat-transfer coefficient of air is 2700 W/m2.°C. Neglecting the chemical reaction, how long will it take for a 50-μm particle to be heated to 695°C? State the Figure or Equation used in your c
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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Cracking is a process in which large hydrocarbon molecules are broken up
cracked into smaller, more valuable hydrocarbon molecules. The cracking of
petroleum hydrocarbons was originally done by thermal cracking. Now, catalytic
cracking offers a greater economic value than the gases produced by thermal
cracking. Assume in a catalytic cracking regenerator, catalytic particles at 600°C
are injected into air at 700°C in a fluidized bed. The specific heat of the particle is
1050 J/kg.°C, the density is 950 kg/m3, and the thermal conductivity is 5 W/m.°C.
Assume the heat-transfer coefficient of air is 2700 W/m2.°C. Neglecting the
chemical reaction, how long will it take for a 50-μm particle to be heated to
695°C? State the Figure or Equation used in your calculations.
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