An analysis of carbon deposition kinetics in isothermal flow systems

✍ Scribed by H.B. Palmer

• Publisher: Elsevier Science
• Year: 1963
• Tongue: English
• Weight: 891 KB
• Volume: 1
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(63)90010-1

✦ Synopsis

An analysis is presented of the steady-state deposition of carbon from a pyrolyzing gas in an isothermal flow system. It is assumed that the parent material is decomposing in the gas phase by first-order kinetics. Three system geometries are examined: an infinite slit, an annulus, and a cylindrical tube. A convenient kinetic criterion for each case is found to be the ratio of a characteristic diffusion time to the first-order rate constant. When this ratio is much less than unity, when carbon deposition from the parent molecules is much less efficient than deposition from decomposition products, and when deposition from products occurs at moderate-to-large efficiencies, it is predicted that the deposition rate will be approximately equal to the rate of gas-phase decomposition of the parent species times some geometric factors.