Acetylene (C2H2) may be formed from methane (CH4) by pyrolyzing-decomposing at high temperature according to the reaction: 2CH4 (g) → C2H2 (g) + 3H2 (g) In a commercial reactor system, the methane is supplied as a liquid at 25°C to a heater where it is heated and vapourised leaving as a vapour at 650°C. The vapour then passes to the catalytic reactor in which a conversion of 40% is achieved. It may be assumed that there are no other reactions, that operation is at a pressure of one atmosphere and that the stream leaving the reactor is all in the vapour state. With a complete block diagram of the process, determine the heat transfer rate (kW) required to the reactor if it is operated isothermally. Evaluate on the value of the heat transfer rate obtained from your calculation. Component State Δ?? ° (kJ/mol) Cp (kJ/mol·K) Methane Liquid ----------- ---------- Gas -74.85 0.34 Acetylene Liquid ---------- ---------- Gas 226.75 0.42 Hydrogen Gas ---------- 0.059 The Cp values may be assumed independent of temperature
Acetylene (C2H2) may be formed from methane (CH4) by pyrolyzing-decomposing at high temperature according to the reaction: 2CH4 (g) → C2H2 (g) + 3H2 (g) In a commercial reactor system, the methane is supplied as a liquid at 25°C to a heater where it is heated and vapourised leaving as a vapour at 650°C. The vapour then passes to the catalytic reactor in which a conversion of 40% is achieved. It may be assumed that there are no other reactions, that operation is at a pressure of one atmosphere and that the stream leaving the reactor is all in the vapour state. With a complete block diagram of the process, determine the heat transfer rate (kW) required to the reactor if it is operated isothermally. Evaluate on the value of the heat transfer rate obtained from your calculation. Component State Δ?? ° (kJ/mol) Cp (kJ/mol·K) Methane Liquid ----------- ---------- Gas -74.85 0.34 Acetylene Liquid ---------- ---------- Gas 226.75 0.42 Hydrogen Gas ---------- 0.059 The Cp values may be assumed independent of temperature
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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Acetylene (C2H2) may be formed from methane (CH4) by pyrolyzing-decomposing at high temperature according to the reaction:
2CH4 (g) → C2H2 (g) + 3H2 (g)
In a commercial reactor system, the methane is supplied as a liquid at 25°C to a heater where it is heated and vapourised leaving as a vapour at 650°C. The vapour then passes to the catalytic reactor in which a conversion of 40% is achieved. It may be assumed that there are no other reactions, that operation is at a pressure of one atmosphere and that the stream leaving the reactor is all in the vapour state. With a complete block diagram of the process, determine the heat transfer rate (kW) required to the reactor if it is operated isothermally. Evaluate on the value of the heat transfer rate obtained from your calculation.
| Component | State | Δ?? ° (kJ/mol) |
Cp (kJ/mol·K) |
| Methane | Liquid | ----------- | ---------- |
| Gas | -74.85 | 0.34 | |
| Acetylene | Liquid | ---------- | ---------- |
| Gas | 226.75 | 0.42 | |
| Hydrogen | Gas | ---------- | 0.059 |
The Cp values may be assumed independent of temperature
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