Adiabatic Fixed-Bed Reactors: Practical Guides in Chemical - download pdf or read online

By Jonathan Worstell

ISBN-10: 0128013060

ISBN-13: 9780128013069

Practical courses in Chemical Engineering are a cluster of brief texts that every offers a concentrated introductory view on a unmarried topic. the complete library spans the most themes within the chemical strategy industries that engineering execs require a simple knowing of. they're ‘pocket courses’ 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 a variety of forms and their actual homes. functions of every gadget kind 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 understand the fundamentals fast and easily.

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

Sample text

But, what if the formation of PoiÀS is not rapid? If the interaction between Poi and S is not strong and rapid, then Poi upon encountering S may simply diffuse past it. Such bypassing of S may occur many times before Poi finally binds irreversibly with an S. In this case, no definite boundary forms between pristine catalyst and adulterated catalyst. Thus, as operating time for the fixed-bed reactor increases, ever more active sites become inactive and catalyst productivity declines as a result of poisoning.

2 portrays this sequence of events. This reaction scheme contains three cases: two limiting cases and a case intermediate between the limiting cases. The first limiting case is that the first reaction is rapid and predominates. The second limiting case is that the second reaction is rapid and predominates. The intermediate case hypothesizes that neither reaction is fast relative to the other nor does either reaction predominate. 2 is rapid and all R quantitatively converts to P upon contact with the catalyst mass, then the remainder of the catalyst mass “sees” only P.

In most cases, we define our standard condition to be a fresh catalyst charge and the product being produced at or near capacity. The component balance for A in our fixed-bed reactor is ð CA;Out ðV dCA dVFluid VFluid 5 5 Q Q 0 CA;In RA where CA, VFluid, and Q were defined in Chapter 2. RA is generally defined as RA ðt 5 0Þ 5 kOverall Nðt 5 0ÞWCA where N(t 5 0) is the number of active sites per catalyst unit mass and W is the mass of catalyst in the fixed-bed reactor. Note that N is time dependent.

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


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