Page 244 - Analysis, Synthesis and Design of Chemical Processes, Third Edition
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Another factor that is sometimes overlooked is that often companies will lock onto a selling or purchase
price through a short- or long-term contract. Such contracts will often yield prices that are significantly
lower than those given in the CMR. In addition, in doing economic evaluations for different chemical
processes, the purchase and selling price for chemicals will not always be available from the CMR. For
example, in January 2001, CMR stopped publishing the price of dimethyl ether. Likewise, prices for allyl
alcohol have not been published for several years. The prices shown in Table 8.4 were obtained from
manufacturers’ quotes. When doing economic evaluations for new, existing, or future plants, it is
advisable to establish the true selling or purchase price for all raw materials and products. Because the
largest operating cost is nearly always the cost of raw materials, it is important to obtain accurate prices
if realistic economic evaluations are to be obtained.
8.5 Yearly Costs and Stream Factors
