By Jonathan Worstell

ISBN-10: 0128013060

ISBN-13: 9780128013069

Practical courses in Chemical Engineering are a cluster of brief texts that every presents a targeted introductory view on a unmarried topic. the total library spans the most subject matters within the chemical method industries that engineering pros require a simple realizing of. they're ‘pocket guides’ that pro engineers can simply hold with them or entry electronically whereas working.

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Adiabatic Fixed-bed Reactors covers the basics of fixed-bed reactors, together with quite a few kinds and their actual houses. purposes of every gadget variety are mentioned, in addition to trouble-shooting Solid-supported Catalysts. this article is perfect for any engineer who's new to operating with fixed-bed reactors and wishes to grasp the fundamentals speedy and easily.

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Additional info for Adiabatic Fixed-Bed Reactors: Practical Guides in Chemical Engineering

Sample text

Levenspiel assumes the rate at which catalyst activity changes with respect to time can be described as a power law equation, namely, da 5 2 kDecay a dt Integrating the above equation yields at 5 a0 e2kDecay t where at is catalyst activity at any time greater than t 5 0. a0 is catalyst activity at t 5 0 and is taken as unity. The component balance for a first-order, irreversible chemical reaction in a fixed-bed reactor is ð CA;Out ð CA;Out dCA dCA VFluid 5 5 Q CA;In RA CA;In 2 kOverall CA 54 Adiabatic Fixed-bed Reactors This mass balance assumes the catalyst never loses its functional activity.

Each regeneration induces a step change in catalyst activity. At some point in time, the operating staff will decide to dump the current catalyst charge and replace it with a new catalyst charge. 5 CATALYST DEACTIVATION BY MECHANICAL MECHANISMS Crush and attrition are the most common mechanical mechanisms causing poor catalyst productivity. Solid-supported catalyst must be able to support its own weight after being charged to a reactor. The catalyst at the bottom of the reactor will be crushed if a solidsupported catalyst cannot support its own weight.

While a linear plot does not prove our assumption, it does indicate the validity of our assumption. With regard to the third assumption, mechanisms can be hypothesized that yield   NðtÞ 2 a5 Nðt50Þ or  NðtÞ a5 Nðt50Þ 3 but such mechanisms are laden with assumptions and are so complex that they would be difficult to prove. 2 shows. 2 rest upon unprovable assumptions. 11 WAVE FRONT OR STREAM-TIME POISONING After determining kDecay, the question becomes: does catalyst deactivation occur via wave front poisoning or stream-time poisoning?

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Adiabatic Fixed-Bed Reactors: Practical Guides in Chemical Engineering by Jonathan Worstell


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