New PDF release: Adiabatic Fixed-Bed Reactors: Practical Guides in Chemical

By Jonathan Worstell

ISBN-10: 0128013060

ISBN-13: 9780128013069

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

Each textual content is extremely functional and utilized, and offers first rules for engineers who have to wake up to hurry in a brand new region speedy. The concentrated evidence supplied in every one advisor might help you communicate with specialists within the box, try your personal preliminary troubleshooting, payment calculations, and remedy rudimentary problems.

Adiabatic Fixed-bed Reactors covers the basics of fixed-bed reactors, together with numerous varieties and their actual homes. functions of every gadget sort 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 desires to understand the fundamentals speedy and easily.

  • Practical, brief, concise info at the fundamentals may help you get a solution or train your self a brand new subject quickly
  • Supported by way of examples that will help you resolve a true international problem
  • Single topic volumes supply key evidence for professionals

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

Example text

Therefore, we can equate kDecay 5 kSFD ðSSolid =VSolid Þ and obtain   kDecay z P 2 PSat ln 52 PFeed 2 PSat vz Catalyst Deactivation 59 which is equivalent to   kDecay z PFeed 2 PSat ln 5 P 2 PSat vz Rearranging the above equation yields   vz PFeed 2 PSat ln 5 kDecay z P 2 PSat Thus, kDecay depends upon the fluid velocity through the catalyst mass, the concentration of poison in the feed, and the inverse length of catalyst mass. This relationship provides a diagnostic tool for differentiating between wave front and stream-time poisoning of solidsupported catalyst: if experiments show catalyst deactivation depends on any of these variables, then catalyst deactivation occurs by wave front poisoning; if catalyst productivity is independent of these variables, then catalyst deactivation occurs by stream-time poisoning.

3 portrays this not uncommon potentiality. If the dissociation of PÀS is slow compared to the formation of PoiÀS, then catalyst deactivation will be spatially dependent. If PÀS dissociates faster than PoiÀS forms, then catalyst deactivation will be temporally dependent. Coke formation may be initiated by reactant, product, or both. Acid sites on solid supports initiate coke formation, as do catalytically active metal sites. Both sites initiate coke formation on bifunctional catalysts. 4 presents a simplified representation of coke formation.

Measuring kOverall for the solidsupported catalyst and for crushed catalyst is the most expeditious way to determine the presence of pore diffusion. If Pellet Crushed kOverall 5 kOverall then pore diffusion is not present during product formation. If Pellet Crushed kOverall , kOverall Crushed then product formation is pore diffusion rate limited. kOverall is Pellet greater than kOverall because the radius of the crushed pellet or extrudate is smaller than the radius of the whole pellet or extrudate, which means reactant and product molecules spend less time traversing the pores of the crushed sample compared to the whole sample.

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


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