Chemical Process Engineering Design and Economics by Harry Silla

By Harry Silla

Chemical strategy Engineering provides a scientific method of fixing layout difficulties via directory the wanted equations, calculating degrees-of-freedom, constructing calculation tactics to generate strategy specifications—mostly pressures, temperatures, compositions, and circulation rates—and sizing apparatus. This illustrative reference/text tabulates quite a few easy-to-follow calculation techniques in addition to the relationships wanted for sizing normal gear.

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4, a continuous, highly-automated process is the most efficient. We expect that the operating efficiency of the process will improve as engineers and technicians become more experienced in operating the plant. The improvement in operating efficiency is the yearly fractional increase in productivity, p. The base year for computing the operating labor is 1952. Thus, n is the number of years since 1952. 1 agrees with the actual labor requirement for several processes by 40%. This error is not unreasonable for an economic estimate.

Their responsibility is to raise the capital to construct the plant and to evaluate the process to maximize its profitability. 1 depicts schematically the cash flow in an organization where the management of a firm is considered a bank, acquiring and dispensing funds. Corporate management acquires capital for various projects from profits earned by several existing divisions of the company, sale of bonds and stock, borrowed funds from banks and other organizations, income from licensing processes to other firms, various services to other firms, and return on investments obtained from other organizations.

As the process engineer gathers new information, he can make a more accurate evaluation followed by a reexamination of the project to determine if it should continue. Even if insufficient technical information is available to design a plant completely, we must still make an economical evaluation to determine if it is economically and financially feasible. A project is economically feasible when it is more profitable than other competing projects, and financially feasible when management can raise the capital for its implementation.

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