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Chemical Engineering E-book. 16K likes. This page will give you the opportunity to achieve the best books concerning chemical engineering sciences. Free Engineering eBooks Online: Chemical Engineering Books. by Peter Dybdahl Hede, , 62 pages, MB, PDF. Advancing Desalination edited by. Chemical Engineering. Are you a chemical engineering student? Find answers to all your questions in our free books. Get prepared for your exams with topics.
The discussion of particulate solids has been shortened and two former chapters on properties and handling of solids and of solids mixing have been combined into one. New material has been added on flow measurement, dispersion operations, supercritical extraction, pressure-swing adsorption, crystallization techniques, crossflow filtration, sedimentation, and many other topics. The treatment of dimensional analysis has been condensed and moved from the appendixes to Chapter 1.
PKt:t'-ACE About two-thirds of the problems at the ends of the chapters are new or revised, with a large majority of them expressed in SI units.
Nearly all the problems can be solved with the aid of a pocket calculator, although a computer solution may be preferred in some cases. The senior author, Or.
Warren L. McCabe, died in August This book is dedicated to his memory. Julian C. The chemical engineer must develop, design, and engineer both the complete process and the equipment used; choose the proper raw materials; operate the plants efficiently, safely, and economically; and see to it that products meet the requirements set by the customers.
Chemical engineering is both an art and a science. Whenever science helps the engineer to solve a problem, science should be used. When, as is usually the case, science does not give a complete answer, it is necessary to use experience and judgment. The professional stature of an engineer depends on skill in utilizing all sources of information to reach practical solutions to processing problems. The variety of processes and industries that call for the services of chemical engineers is enormous.
Products of concern to chemical engineers range from commodity chemicals like sulfuric acid and chlorine to high-technology items like polymeric lithographic supports for the electronics industry, high-strength composite materials, and genetically modified biochemical agents. The processes described in standard treatises on chemical technology and the process industries give a good idea of the field of chemical engineering, as does the report on the profession by the National Research Council!
The field is divided into convenient, but arbitrary, sectors. This text covers that portion of chemical engineering known as the unit operations. For example, in most processes solids and fluids must be moved; heat or other forms of energy must be transferred from one substance to another; and tasks like drying, size reduction, distillation, and evaporation must be performed.
The unit-operation concept is this: by studying systematically these operations themselves-operations that clearly cross industry and process lines-the treatment of all processes is unified and simplified. The strictly chemical aspects of processing are studied in a companion area of chemical engineering called reaction kinetics.
The unit operations are largely used to conduct the primarily physical steps of preparing the reactants, separating and purifying the products, recycling unconverted reactants, and controlling the energy transfer into or out of the chemical reactor. The unit operations are as applicable to many physical processes as to chemical ones. For example, the process used to manufacture common salt consists of the following sequence of the unit operations: transportation of solids and liquids, transfer of heat, evaporation, crystallization, drying, and screening.
No chemical reaction appears in these steps. On the other hand, the cracking of petroleum, with or without the aid of a catalyst, is a typical chemical reaction conducted on an enormous scale.
Here the unit operations-transportation of fluids and solids, distillation, and various mechanical separations-are vital, and the cracking reaction could not be utilized without them. The chemical steps themselves are conducted by controlling the flow of material and energy to and from the reaction zone. Because the unit operations are a branch of engineering, they are based on both science and experience.
Theory and practice must combine to yield designs for equipment that can be fabricated, assembled, operated, and maintained. A balanced discussion of each operation requires that theory and equipment be considered together. An objective of this book is to present such a balanced treatment. A number of scientific principles and techniques are basic to the treatment of the unit operations. Their general use is described in the remainder of this chapter.
Other special techniques important in chemical engineering are considered at the proper places in the text. Strong efforts are underway for its universal adoption as the exclusive system for all engineering and science, but older systems, particularly the centimeter-gram-second cgs and foot-pound-second fps engineering gravitational systems, are still in use and probably will be around for some time.
The chemical engineer finds many physiochemical data given in cgs units; that many calculations are most conveniently made in fps units; and that SI units are increasingly encountered in science and engineering. Thus it becomes necessary to be expert in the use of all three systems. In the following treatment, the SI system is discussed first, and the other systems are then derived from it. The procedure reverses the historical order, as the SI units evolved from the cgs system.
Because of the growing importance of the SI system, it should logically be given a preference.
If, in time, the other systems are phased out, they can be ignored and the SI system then used exclusively. Physical Quautities Any physical quantity consists of two parts: a unit, which tells what the quantity is and gives the standard by which it is measured, and a number, which tells how many units are needed to make up the quantity. Sections of this page.
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