Read e-book online Chemical Engineering Volume 3, Third Edition: Chemical and PDF

By D G Peacock, J.F. Richardson

ISBN-10: 0080410030

ISBN-13: 9780080410036

The booklet of the 3rd variation of 'Chemical Engineering quantity three' marks the finishing touch of the re-orientation of the fundamental fabric inside the first 3 volumes of the sequence. quantity three is dedicated to response engineering (both chemical and biochemical), including size and strategy keep an eye on. this article is designed for college kids, graduate and postgraduate, of chemical engineering.

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Additional resources for Chemical Engineering Volume 3, Third Edition: Chemical and Biochemical Reactors & Process Control

Example text

The equations which result when these integrations are carried out for reactions of various orders are discussed in considerable detail in most texts dealing with the physico-chemical aspects of chemical kinetics''. '). 1 shows a summary of some of the simpler cases; the integrated forms can be easily verified by the reader if desired. One particular point of interest is the expression for the halj--lge of a reaction t,,*; this is the time required for one half of the reactant in question to disappear.

In practice, there is always some degree of departure from the ideal plug flow condition of uniform velocity, temperature, and composition profiles. If the reactor is not packed and the flow is turbulent, the velocity profile is reasonably flat in the region of the turbulent core (Volume 1, Chapter 3), but in laminar flow, the velocity profile is parabolic. More serious however than departures from a uniform velocity profile are departures from a uniform temperature profile. If there are variations in temperature across the reactor, there will be local variations in reaction rate and therefore in the composition of the reaction mixture.

Other variables which must be controlled, apart from feed composition and flowrates in and out, are temperature and, for gas reactions particularly, pressure. Variations of any of these quantities with time will cause a change in the composition levels of the reactant in the reactor, and these will appear in the Accumulation term (4) in the material balance. e. 20) (4) In the Inflow and Outflow terms ( 1 ) and (2), the heat flow may be of two kinds: the first is transfer of sensible heat or enthalpy by the fluid entering and leaving the element; and the second is heat transferred to or from the fluid across heat transfer surfaces, such as cooling coils situated in the reactor.

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Chemical Engineering Volume 3, Third Edition: Chemical and Biochemical Reactors & Process Control by D G Peacock, J.F. Richardson

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