E.J. Hoffman – författare

The petroleum, natural gas, and the chemical & petrochemical process industries, variously require the separation of mixtures -- whether of raw feedstream materials, reactants, intermediates, or products -- as comprising gases, liquids, or solutions. Membrane separations add another weapon to the arsenal of separation methods, including the upgrading of subquality natural gas reserves. This book furnishes the necessary derivations and calculations for numerically predicting the separations that can be obtained, based on the known respective membrane permeabilities of the pure components. A verstile text, Membrane Separations Technology is suitable both as a reference and a textbook for the practicing process engineer, the researcher, and chemical & petrochemical engineering faculty and students.- Has cutting-edge scientific methods for liquifying and transporting natural gas- Written for the engineer in the field, for easy access to important information- Also contains problems and solutions for the student and professor in chemical engineering departments

The ubiquitous examples of unsteady-state fluid flow pertain to the production or depletion of oil and gas reservoirs. After introductory information about petroleum-bearing formations and fields, reservoirs, and geologic codes, empirical methods for correlating and predicting unsteady-state behavior are presented. This is followed by a more theoretical presentation based on the classical partial differential equations for flow through porous media.Whereas these equations can be simplified for the flow of (compressible) fluids, and idealized solutions exist in terms of Fourier series for linear flow and Bessel functions for radial flow, the flow of compressible gases requires computer solutions, read approximations. An analysis of computer solutions indicates, fortuitously, that the unsteady-state behavior can be reproduced by steady-state density or pressure profiles at successive times. This will demark draw down and the transition to long-term depletion for reservoirs with closed outer boundaries.As an alternative, unsteady-state flow may be presented in terms of volume and surface integrals, and the methodology is fully developed with examples furnished. Among other things, permeability and reserves can be estimated from well flow tests.The foregoing leads to an examination of boundary conditions and degrees of freedom and raises arguments that the classical partial differential equations of mathematical physics may not be allowable representations. For so-called open petroleum reservoirs where say water-drive exists, the simplifications based on successive steady-state profiles provide a useful means of representation, which is detailed in the form of material balances.Unsteady-State Fluid Flow provides:• empirical and classical methods for correlating and predicting the unsteady-state behavior of petroleum reservoirs• analysis of unsteady-state behavior, both in terms of the classical partial differential equations, and in terms of volume and surface integrals• simplifications based on successive steady-state profiles which permit application to the depletion of both closed reservoirs and open reservoirs, and serves to distinguish drawdown, transition and long-term depletion performance.

Membranes Technology ebook Collection contains 4 of our best-selling titles, providing the ultimate reference for every filtration and separation engineer''s library. Get access to over 1500 pages of reference material, at a fraction of the price of the hard-copy books. This CD contains the complete ebooks of the following 4 titles:Singh, Hybrid Membrane Systems for Water Purification: Systems Design and Operations Technology, 9781856174428 Judd, The MBR Book: Principles and Applications of Membrane Bioreactors for Water and Wastewater Treatment , 9781856174817 Judd, Membranes for Industrial Wastewater Recovery and Re-use, 9781856173896 Hoffman, Membrane Separations Technology, 9780750677103- Four fully searchable titles on one CD providing instant access to the ULTIMATE library of engineering materials for filtration and separation professionals- 1500 pages of practical and theoretical membranes information in one portable package- Incredible value at a fraction of the cost of the print books

The world of medicine has become splintered into two factions, that of orthodoxy and its counterpart, alternative or complementary medicine. A problem with alternative medicine is, of course, that of anecdote and hearsay. The solution: the disclosure, in an unassailable fashion, of the underlying biochemical principles for alternative cancer therapies.Cancer and the Search for Selective Biochemical Inhibitors, Second Edition delineates the underlying biochemical principles for alternative cancer therapies. Completely revised and updated, this edition includes coverage of the link between concepts and practices of alternative and conventional medicine. The author examines anticancer plant substances and other alternatives such as Vitamin C, essiac tea, shark cartilage, and cat’s claw. The text also addresses the problem of determining selective and non-toxic enzyme inhibitors for cancer cell metabolic pathways. While an increased number of allopathic professionals are in tune with alternative therapies, the integration of the two factions is far from the norm. Keeping the same format that made its predecessor a benchmark text, this book compares complementary, alternative, and integrative treatments with chemotherapy and other more traditional treatments.

The world of medicine has become splintered into two factions, that of orthodoxy and its counterpart, alternative or complementary medicine. A problem with alternative medicine is, of course, that of anecdote and hearsay. The solution: the disclosure, in an unassailable fashion, of the underlying biochemical principles for alternative cancer therap

The world of medicine has become splintered into two factions, that of orthodoxy and its counterpart, alternative or complementary medicine. A problem with alternative medicine is, of course, that of anecdote and hearsay. The solution: the disclosure, in an unassailable fashion, of the underlying biochemical principles for alternative cancer therap