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Characterization and analysis of continuous recycle systems

✍ Scribed by Uzi Mann; Michael Rubinovitch; Edwin J. Crosby

Publisher
American Institute of Chemical Engineers
Year
1979
Tongue
English
Weight
896 KB
Volume
25
Category
Article
ISSN
0001-1541

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✦ Synopsis

Abstract

A general analysis of continuous recycle systems and models is presented by considering the fluid history inside the systems. The history of a fluid element is expressed in terms of the number of cycles it completes, its residence time in the system and the total time it resides in a specific section of the systems. Concepts from probability theory are used to derive expressions for the number of cycles distribution (NCD), the residence time distribution (RTD), and the total regional residence time distribution (TRRTD) and their means and variances. Applications of these distributions in various processes are considered. Relationships between the number of cycles, the residence time, and the total regional residence time are expressed in terms of the covariances and correlation coefficient of pairs of these variables. These relationships allow the estimation of one variable for a given value of the other, and thus provide a mathematical means to completely describe the history of fluid in a recycle system.

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