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Author: Jong Soo Cho
Publisher:
ISBN:
Category : Gases
Languages : en
Pages : 190
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Book Description
The surface renewal rate from Danckwerts' theory and the effective interfacial area between gas and liquid per unit packing volume in a packed absorption tower were evaluated for the absorption of carbon dioxide into carbonate/bicarbonate buffer solution accompanied by a pseudo-first order chemical reaction. The rate of chemical reaction in the liquid phase was controlled by varying the buffer ratios. A small absorption tower was constructed, which had a packing section, 30 cm high with 10.2 cm inside diameter. Two kinds of packing, 1/2-inch Rasehig ring for one part of the experiment and 1/2 inch Ben saddle for the other part of the experiment, were used in the investigation. Sodium carbonate/bicarbonate buffer solutions, with buffer ratios varying from 0.4 to 3.0, were used. Glycerine-water solutions were also used to investigate the effect of density and viscosity on the physical absorption of carbon dioxide; the content of glycerine varied from 0 to 40 % wt. Pure carbon dioxide was used to eliminate the gas side resistance in the mass transfer operation. The results of this investigation suggested the following conclusions: The surface renewal rate, s, and the effective interfacial area per unit packing volume, a, for each packing can be expressed as functions of Reynolds Number of the liquid flow. The comparison of values from this study with those of Danckwerts showed discrepancies; these discrepancies could be due to different flow patterns, packing densities, and the apparently more uniform distribution of liquid over the packing. The mass transfer coefficient for physical absorption into glycerine solution was expressed as a function of Reynolds number and Schmidt number. The mass transfer coefficient calculated from Danckwerts' model equation, kL*a = [Ds divided by a*] for absorption of carbon dioxide into water seemed to be larger than those measured in this experiment.
Author: Jong Soo Cho
Publisher:
ISBN:
Category : Gases
Languages : en
Pages : 190
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Book Description
The surface renewal rate from Danckwerts' theory and the effective interfacial area between gas and liquid per unit packing volume in a packed absorption tower were evaluated for the absorption of carbon dioxide into carbonate/bicarbonate buffer solution accompanied by a pseudo-first order chemical reaction. The rate of chemical reaction in the liquid phase was controlled by varying the buffer ratios. A small absorption tower was constructed, which had a packing section, 30 cm high with 10.2 cm inside diameter. Two kinds of packing, 1/2-inch Rasehig ring for one part of the experiment and 1/2 inch Ben saddle for the other part of the experiment, were used in the investigation. Sodium carbonate/bicarbonate buffer solutions, with buffer ratios varying from 0.4 to 3.0, were used. Glycerine-water solutions were also used to investigate the effect of density and viscosity on the physical absorption of carbon dioxide; the content of glycerine varied from 0 to 40 % wt. Pure carbon dioxide was used to eliminate the gas side resistance in the mass transfer operation. The results of this investigation suggested the following conclusions: The surface renewal rate, s, and the effective interfacial area per unit packing volume, a, for each packing can be expressed as functions of Reynolds Number of the liquid flow. The comparison of values from this study with those of Danckwerts showed discrepancies; these discrepancies could be due to different flow patterns, packing densities, and the apparently more uniform distribution of liquid over the packing. The mass transfer coefficient for physical absorption into glycerine solution was expressed as a function of Reynolds number and Schmidt number. The mass transfer coefficient calculated from Danckwerts' model equation, kL*a = [Ds divided by a*] for absorption of carbon dioxide into water seemed to be larger than those measured in this experiment.
Author: P. L. Spedding
Publisher:
ISBN:
Category : Gases
Languages : en
Pages : 46
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Book Description
Author: Nikolai Kolev
Publisher: Elsevier
ISBN: 0080463924
Category : Technology & Engineering
Languages : en
Pages : 709
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Book Description
Packed bed columns are largely employed for absorption, desorption, rectification and direct heat transfer processes in chemical and food industry, environmental protection and also processes in thermal power stations like water purification, flue gas heat utilization and SO2 removal. These Separation processes, are estimated to account for 40%-70% of capital and operating costs in process industry. Packed bed columns are widely employed in this area. Their usage also for direct heat transfer between gas and liquid, enlarge their importance. They are the best apparatuses, from thermodynamical point of view, for mass and heat transfer processes between gas and liquid phase. Their wide spreading is due to low capital investments and operating costs. Since 1995 there has not been published a specialised book in this area, and this is a period of quick development of packed columns. Packed Bed Columns reflects the state of this field including the author's experience on creating and investigating of new packings, column internals and industrial columns. - Considers the theories of mass transfer processes and shows how they help the construction of highly effective packings - Complete information about the performance characteristics of different modern types of highly effective packings - Considers the models for calculation and areas of their application
Author: P. Chattopadhyay
Publisher: Asian Books Private Limited
ISBN: 8184120338
Category :
Languages : en
Pages : 167
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Book Description
Absorption And Stripping Are Essential Two Very Important Unit Operations Frequently Encountered In Both Cpis And Pcis. In Many Plants, Absorption & Stripping Operate In Conjunction With Distillation The Oldest Unit Operation That Emerged From Alchemists Laboratory Centuries Back.Contents: Absorption; Stripping; Hydraulics Of Operation; Design: Basic Concepts; Design: Absorbers & Strippers; Packings; Packed Tower Internals; Typical Absorptions Of Industrial Importance; Revamping Absorbers And Strippers; Cost Estimation Of Absorption Tower; Miscellaneous; Index; Etc.
Author: R. L. Earle
Publisher: Elsevier
ISBN: 1483293106
Category : Technology & Engineering
Languages : en
Pages : 216
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Book Description
This long awaited second edition of a popular textbook has a simple and direct approach to the diversity and complexity of food processing. It explains the principles of operations and illustrates them by individual processes. The new edition has been enlarged to include sections on freezing, drying, psychrometry, and a completely new section on mechanical refrigeration. All the units have been converted to SI measure. Each chapter contains unworked examples to help the student gain a grasp of the subject, and although primarily intended for the student food technologist or process engineer, this book will also be useful to technical workers in the food industry
Author: Jerzy Mackowiak
Publisher: Springer Science & Business Media
ISBN: 3540887814
Category : Science
Languages : en
Pages : 368
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Book Description
The?rstGermanedition of thebook“Fluiddynamicsofpackedcolumns with modern random and structured packings for gas/liquid systems” was published in 1991. It sold out within a few years. Added to this were numerous enquiries, in particular within the industry, prompting me to publish a second, extended edition. A packed column remains the core element of any diffusional separation process. This underlines the need for basic design principles for packed columns, which enhance the design process by making it more accurate and reliable. The SBD (suspended bed of droplets) model introduced in the ?rst German edition of the book was well received by the experts and is now used by a large number of com- nies in the industry, as it offers improved reliability in the ?uid dynamic design of packed columns. For the purpose of facilitating the design process, the SBD model was in- grated into the simulation programme ChemCAD. The software programme FDPAK, which is available for Windows, has certainly contributed to the widespread use of the SBD model. The programme is very user-friendly and the calculation results are p- sented in tabular as well as graphic form, showing ?ood load, pressure drop and hold-up diagrams in the entire operating range.
Author: Betty Ann Cooper
Publisher:
ISBN:
Category :
Languages : en
Pages : 284
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Book Description
Author: A. P. SINHA
Publisher: PHI Learning Pvt. Ltd.
ISBN: 812034541X
Category : Technology & Engineering
Languages : en
Pages : 690
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Book Description
This book introduces the fundamental principles of the mass transfer phenomenon and its diverse applications in process industry. It covers the full spectrum of techniques for chemical separations and extraction. Beginning with molecular diffusion in gases, liquids and solids within a single phase, the mechanism of inter-phase mass transfer is explained with the help of several theories. The separation operations are explained comprehensively in two distinct ways—stage-wise contact and continuous differential contact. The primary design requirements of gas–liquid equipment are discussed. The book provides a detailed discussion on all individual gas–liquid, liquid–liquid, solid–gas, and solid–liquid separation processes. The students are also exposed to the underlying principles of the membrane-based separation processes. The book is replete with real applications of separation processes and equipment. Problems are worked out in each chapter. Besides, problems with answers, short questions, multiple choice questions with answers are given at the end of each chapter. The text is intended for a course on mass transfer, transport and separation processes prescribed for the undergraduate and postgraduate students of chemical engineering.
Author: Kirk-Othmer
Publisher: Wiley-Interscience
ISBN: 9780471020370
Category : Science
Languages : en
Pages : 967
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Book Description
Encyclopedia of Chemical Technology The Third Edition of the Encyclopedia of Chemical Technology is built on the solid foundation of the previous editions. All of the articles have been rewritten and updated and many new subjects have been added to reflect changes in chemical technology through the 1970s. The new edition, however, will be familiar to users of the earlier editions: comprehensive, authoritative, accessible, lucid. The Encyclopedia remains an indispensable information source for all producers and users of chemical products and materials. In the Third Edition emphasis is given to major present-day topics of concern to all chemists, scientists, and engineers—energy, health, safety, toxicology, and new materials. New subjects have been added, especially those related to polymer and plastics technology, fuels and energy, inorganic and solid-state chemistry, composite materials, coating, fermentation and enzymes, pharmaceuticals, surfactant technology, fibers and textiles. New features include the use of SI units as well as English units, Chemical Abstracts Service’s Registry Numbers, and complete indexing based on automated retrieval from a machine-readable composition system. Once again this classic serves as an unrivaled library of information for the chemical and allied industries. Some comments about Kirk-Othmer— The First Edition "No reference library worthy of the name will be without this series. It is simply a must for the chemist and chemical engineer…" —Chemical and Engineering News The Second Edition "A necessity for any technical library." —Choice
Author: James P. Welty
Publisher: John Wiley & Sons
ISBN: 1119587026
Category :
Languages : en
Pages : 786
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Book Description
