Chemical Process Engineering Design and Economics by Harry Silla

By Harry Silla

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

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20 x (Fixed Capital Cost) f. Interest is at the current rate Copyright © 2003 by Taylor & Francis Group LLC 36 Chapter 2 DIRECT COSTS Raw Materials Sometimes raw material cost will dominate the production cost. A chemical company will attempt to protect its source of supply by arranging long term contracts, which also benefits the supplier. 2. Prices of chemicals depend on the quantity purchased. Published prices tend to be high, particularly, for Aldrich, Alfa Inorganic, and Fisher who sell small quantities of many chemicals for research.

As the process development advances, then you should use more accurate methods. 4 divides the depreciable capital costs into several categories. The two major categories are direct and indirect costs. Peters and Timmerhaus [4] and Humphreys [5] list these costs. Reference [3] gives a more detailed breakdown. 2) In the factor methods for cost estimating, first calculate the purchased or delivered cost of all major equipment, for example, distillation columns, reactors, pumps, heat exchangers, etc.

Before estimating the depreciable capital cost, the process engineer must first calculate mass and energy flow rates to size process equipment. He can then estimate the cost of all equipment and finally the depreciable and fixed capital costs. Besides sizing equipment he must also calculate utility requirements from the mass and energy flow rates. Two methods for estimating capital costs will be discussed: one is the average factor method and the second is the individual factor method. At the early stages of developing a process, you can use these Copyright © 2003 by Taylor & Francis Group LLC 48 Chapter 2 simple methods.

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