Introduction

The construction of any chemical plant requires a deep study about its economy whether it is suitable or not, in order to proceed the process. This chapter will focus on the economy of the propane dehydrogenation process. Results performed in the previous chapters will be utilized in this chapter in order to construct an overall study of the economy of the process. Moreover, some suggestions will be proposed regarding the utility cost to be minimized and environmental damage abatement, through preformation of heat integration.

The overall study will focus on many aspects including capital cost which gives an idea about the module cost, total bare module and grassroot costs, water operation, waste treatment, operating labor, utility, raw material, and fixed capital cost. The previous values will be calculated in order to calculate the cost for the manufacture.

As part of the process, cash will be consumed and produced unstable rate and at different time intervals throughout the lifetime of the process, beginning from the plant construction and continuously remaining through operation time. The cash flow diagrams will be utilized to give a clear demonstration about the process cash flow during plant lifetime.

Heat integration will be performed in order to maximize the process heat efficiency and minimize the costs through pinch analysis. The thermodynamics fundamentals will be applied to ensure the most profitable utilization of the heat of the process. Among any other methods, pinch analysis has been considered to be the best approach to accomplish heat integration.

1. For calculations, CAPCOST was used. 2. The parameters form both HYSYS and the equipment design report were utilized in the calculation of the cost. 3. 1,000,000 $ is assumed to be the cost of the land. 4. Taxation rate was assumed to be 2.5% Zakah. 5. The stream factor was assumed to be 0.95. 6. The operating hours 8322 per year. 7. 3 years are assumed to be the construction period. 8. The life cycle of the plant was assumed to be 12 years. 9. The feedstock for the process is LPG (propane) and the product is Propylene. 10. Cost of raw material and product:

Table 140: Cost of raw materials and product.

Material Name Classification Price ($/kg) Flowrate (kg/h) Annual Cost

LPG Raw Material $ 0.74 38115.00 $ 234,722,842

Propylene Product $ (1.05) 45660.00 $ (398,221,681)