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Membrane Processes by R. Rautenbach and R. Albrecht John Wiley & Sons UK (1989 reprinted 1994). 459 pages

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Membrane Processes, by R. Rautenbach and R. Albrezht, John Wiley
& Sons, UK (1989, reprinted 1994). 459 pages. ISBN 0-47-191-1100
In the last quarter of this century, membrane separations pmcessahave evolved into
very practical unit operations. In fact, as the authors of Membrane Processes point
out, membrane seprtrations are now seriously consided for any plocess involving
fluid separations. Of the membrane process available, ulmfilmion and rev061110533 have been most successful in their variety ofapplications. These processes
are generally used in the food processing and water treatment indostries.
While, the use. of membranes in separations pnxmses are seemingly simple, in
fact, an & d v e design o f a process for a specific large-scale application can be
quik complicated. The authors feel that more extensive use of membraae processes
can be made if irnpoxtant design c o n s i m are recognized and considued.
Many design co-om
are ntcessary to insure that the most economical process
is considered in evaluating the relevance of membrane pmeses, Thus the authors'
intent ofthis bookis toprovidea single source w ~ m e a n b r a u e p r o ~ ~ ~ ~ dise s i g n
appreciated and the most sisnificant factors in developing an economical m m b e
process are addressed. In particular, their goal is to discuss membraue separation
perraining 00 reverse mosis, urtrafiltration, microfiltration, dialysis, elemxlialysis,
liquid membrane pcesses, gas permeation, and Pervaporation.
The authorsmmgaize that membrane separationhas vastly changed in the last
two decades. Thus, this book is a complete revision of the authors' oxiginal book
Written in 1989. The authors chose to begin this difficult UndertaLing by quickly
introducing the various membrane separation processes and discussing their
simhrities and diffmnces. Next, rather than divide their book into fractions that
covex each of these operations in detail,they chose to firstdiscuss the unifying fheay
that is inhesent in atl membrane processes. This approach is very &ective in that it
eliminates redundaacy that is inevitable when sepame pmxsse~are discussed. The
mtfomchapteas ofthe thirtetn Chapterbodrdiscusses the the!my associated with
membrane mnsport phenomena
The next two chapm discuss design
considedons far CIlsCades and modules. The following three chapters discuss
specificdesign COIlsideTBtions for revem osmosis and uleafiltration. The remaining
four chapters discuss additional pressure-drivenmembrane processes, elemodialysis,
Pervaporation and gas permeation. The bodr conveniently provides a Table a€
Contents for each chapter.
Despite the unifying attempt of Membrune Processes, the book appears to lack
continuity and to be hastily prepared. It is clear &om the beginning that this book is
dominated by discussions on reverse osmosis processes. This is not surprising, since
merseosmosis has beea one ofthe most suuxshl membrane sepamtion pmcesxs
to date. However, the chapters on mass transport and mass aansport resistance rn
mostly about reverse osmosis with some later discussion on ultrafiltration. Transport
phenomena associated with elecmdialysis, pempom'on and gas permeation are
suspended until later chapters which are dewmi specifically b these opera ti or^^.
These chapters appeared afrer several chapters devoted to examples of reverse
236
osmosis and ultrafiltration in industry. This gave the impression that, despite the
appearance of a unifying structure, the book was not well organized. Other aspects
of the book may lead the reader to this conclusion as well. Almost all of the
photographs am very poorly reproduced. Also, many of the figure captions
contained e x e o n s that are not explained in the text and it appears as though
some of the figures, tables and graphs are not properly referenced. At the end of
each chapter, I was expecting a summarizing statement that was consistent with the
objective of the book particularly after the mass innsport and design chapters, I
would have liked to have seen some statements on how these design features
impacted the economics of membrane separations process design. However the
reader is left to infer the sigaifcance of these design features.
The references used seemed to be outdated and missing, even when one
considers the fact that the book was originally published in 1989. For example, the
discussion on the mass transfer weflicients could have included recent refemces on
the deviations of mass transfer coefficients for membrane separation from heat
transfer analogies. Even though the authors mention almethods to enhancing
shear rate to reduce concentration polarhation, the references to these pmceses are
not given.
Also, the transpo~equations for ultrafiltration used were overly simplified, It
would have been more effective to simply include the general expressions developed
for reverse osmosis and to also include ultrafiltration where applicable. For instance,
concentration polarization is as much as a concern in many ultrafiition pmesses
as it is in revem osmosis. I was also concerned with the authors' decision to
extensively develop some of the mass transfer equations but neglect other
parameters. For instance, the reflection coefficient, which is important in selective
separation,was not mentioned. I was disappointed that at least some discussion was
not devoted to selectivity with respect to pore size distribution or membrane
propemes.
The book did give a good overview of current industrial practice with
membrane processes, and from this point of view, it is indispensable. The chapters
on cascade prouses and module design provided valuable practical information.
The coverage of revosmosis and ultrat3tration practice was particularly well
presented An effort was made to couple the performance of these processes with
economic significance,however the data seemed to be somewhat out of date. Again,
I thought that the design equations could have been beaer summarized for overall
impact and economic significance.
In summary, Membrune Processes does contain valuable information for
industrial concans who are looking for a source that discusses many of the design
derails in membrane separation pmesses. It can be a valuable reference book to
leam about current designs for membrane processes.
Associate professorV.G.J.Rodgers
Dept of Chemical & Biochemical Engineering
The University of Iowa, Iowa City
Iowa 52241-1219, USA
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albrecht, 1989, processes, membranes, sons, rautenbach, 1994, page, 459, wiley, john, reprinted
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