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.

Each textual content is very functional and utilized, and provides first rules for engineers who have to wake up to hurry in a brand new quarter speedy. The concentrated proof supplied in every one consultant can help you speak with specialists within the box, try out your personal preliminary troubleshooting, cost calculations, and clear up rudimentary problems.

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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