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Absorption in Gas—Liquid Dispersions.
Rook Reviews F. H. H. VAUNTIN: Almerptioa la Gas-Liquid E. &I’. N. Spon Ltd., 1967,212 pp., 55s.
Dlsperslons.
Tnx AUTHOR of this book has performed a useful service to chemical engineering in summarising the findings of a large nllfnbeI of investigations in the field of gas-liquid contacting in deep pools, stirred tanks and on plates. The work of the Warren Springs Laboratory on bubbles and froths forms, understandably, a significant part but other investigations are not neglected. It is regrettable that the production of this book is somewhat slipshod, for instance in the ommission or duplication of figures and the sentence which reads rather oddly because, the reader must presume, something has been left out. More serious than these errors, which can easily bc spotted, are a few misleading statements. Perhaps some are to be expected in a collection such as this of the good, the average and a few selections of more dubious worth from the literature. Noticeable amongst these is a short numerical analysis, quoted at length, which purports to show that
J. M. PRAUSNITZ,C. A. ECKERT, R. V. ORYE and J. P. O'CONNELL: Computer Calculations for Multicomponent Vapor-LlquidRqullihrla.Prentice-Hall, 1967,238 pp., $12.50. THISbook is a useful summary of the techniques of calculations of vapor-liquid equilibrium. The concept of the semi-ideal solution is employed to account for non-ideality of the liquid phase and fugacities are used throughout. Vapor phase fugacities are calculated using the virial equation truncated after the second term. There is some question as to how useful the information presented on programming techniques is, for as the authors state “the programs outlined here are merely guidelines for the user and should be modified In fact, the authors emphasise to suit each application”. that the programming of multicomponent vapor-liquid equilibrium must be done with sound judgement. It is essential that the programmer real& the limitations of the correlations employed for calculation of activity coefficients, fugacity coefficients, etc. In this respect, it is unfortunate that the authors devote so little space to the development and discussion of the correlations and thermodynamic reasoning they employ in their calculations. The techniques that have
gas-liquid mass transfer from bubbles usually operates in a region where the liquid phase resistance is controlling. Few distillation experts would agree with such a conclusion and it is evident that this erroneous deduction results from omitting the gas-liquid partition coefficient for the transferring species in the analysis presented. A second error noted which might mislead is to be found in the formula for liquid throw over a weir where the height of the weir is mistakenly substituted for the crest over the weir. It seems a pity that the author who has obviously spent a great deal of effort on gathering together this mass of information was not somewhat more critical and selective in his choice and more careful in eliminating typographical errors. Despite these criticisms, this book is recommended to post graduate students working on mass transfer in gas-liquid dispersions and to practising chemical engineers as areadyreference to up-to-date literature in this field. S. P. S. ANDREW
been skillfully developed by Prausnitz et al., for the calculation of vapor-liquid equilibria merit further development in the text. The authors are careful to include comparisons between calculated and experimentally observed liquid-vapor compositions in the text. Data is presented for a wide range of solutions, including solutions containing polar constituents and solutions in which hydrogen bonding exists. The agreement between experimental and calculated results presented is excellent. Parameters necessary for employing the correlations suggested by the authors are included in an Appendix for many substances. In summary, the authors present a useful guide to the problem of computer calculation of multicomponent phase equilibria. The subject is present in an abbreviated fashion and is not suitable as an introduction to the problem of the calculation of multicomponent phase equilibria. Nonetheless, the book is well written and serves as a concise guide to those who are engaged in calculations of this type.
1529
R. J. MADIX
Dlsperslons.
Tnx AUTHOR of this book has performed a useful service to chemical engineering in summarising the findings of a large nllfnbeI of investigations in the field of gas-liquid contacting in deep pools, stirred tanks and on plates. The work of the Warren Springs Laboratory on bubbles and froths forms, understandably, a significant part but other investigations are not neglected. It is regrettable that the production of this book is somewhat slipshod, for instance in the ommission or duplication of figures and the sentence which reads rather oddly because, the reader must presume, something has been left out. More serious than these errors, which can easily bc spotted, are a few misleading statements. Perhaps some are to be expected in a collection such as this of the good, the average and a few selections of more dubious worth from the literature. Noticeable amongst these is a short numerical analysis, quoted at length, which purports to show that
J. M. PRAUSNITZ,C. A. ECKERT, R. V. ORYE and J. P. O'CONNELL: Computer Calculations for Multicomponent Vapor-LlquidRqullihrla.Prentice-Hall, 1967,238 pp., $12.50. THISbook is a useful summary of the techniques of calculations of vapor-liquid equilibrium. The concept of the semi-ideal solution is employed to account for non-ideality of the liquid phase and fugacities are used throughout. Vapor phase fugacities are calculated using the virial equation truncated after the second term. There is some question as to how useful the information presented on programming techniques is, for as the authors state “the programs outlined here are merely guidelines for the user and should be modified In fact, the authors emphasise to suit each application”. that the programming of multicomponent vapor-liquid equilibrium must be done with sound judgement. It is essential that the programmer real& the limitations of the correlations employed for calculation of activity coefficients, fugacity coefficients, etc. In this respect, it is unfortunate that the authors devote so little space to the development and discussion of the correlations and thermodynamic reasoning they employ in their calculations. The techniques that have
gas-liquid mass transfer from bubbles usually operates in a region where the liquid phase resistance is controlling. Few distillation experts would agree with such a conclusion and it is evident that this erroneous deduction results from omitting the gas-liquid partition coefficient for the transferring species in the analysis presented. A second error noted which might mislead is to be found in the formula for liquid throw over a weir where the height of the weir is mistakenly substituted for the crest over the weir. It seems a pity that the author who has obviously spent a great deal of effort on gathering together this mass of information was not somewhat more critical and selective in his choice and more careful in eliminating typographical errors. Despite these criticisms, this book is recommended to post graduate students working on mass transfer in gas-liquid dispersions and to practising chemical engineers as areadyreference to up-to-date literature in this field. S. P. S. ANDREW
been skillfully developed by Prausnitz et al., for the calculation of vapor-liquid equilibria merit further development in the text. The authors are careful to include comparisons between calculated and experimentally observed liquid-vapor compositions in the text. Data is presented for a wide range of solutions, including solutions containing polar constituents and solutions in which hydrogen bonding exists. The agreement between experimental and calculated results presented is excellent. Parameters necessary for employing the correlations suggested by the authors are included in an Appendix for many substances. In summary, the authors present a useful guide to the problem of computer calculation of multicomponent phase equilibria. The subject is present in an abbreviated fashion and is not suitable as an introduction to the problem of the calculation of multicomponent phase equilibria. Nonetheless, the book is well written and serves as a concise guide to those who are engaged in calculations of this type.
1529
R. J. MADIX