The present paper describes the behavior of the capital and operating cost as driving forces for the design of the first stage of enrichment of heavy water production by the Girdler Sulfide (GS) process. A very useful procedure for analyzing a process or control system is by means of the Second Law of Thermodynamics. Determining where the irreversibilities of a process or control systems are generally indicates where the greatest improvements can be made, particularly as they relate to operating cost. Thermodynamic analyses based on the concepts of irreversible entropy increase have frequently been suggested as pointers to sources of inefficiency in chemical processes. Furthermore, this study shows a generalized discussion of the cost with respect to the optimization parameters, it points out where the irreversibilities of the process are located, and provides a generalized discussion from the successful application of the technique.

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