الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Today the oil market demands are calling for more gasoline and diesel products while having a problem of heavier crude oils with high density that becomes available over the lighter crudes in the last decades. The needs to heavy oil processing become the priority in all refineries. More sophisticated distillation, physical separation units and conversion units are required for heavy oil processing. One of the most important conversion units is the delayed coker unit which converts the heaviest and least desirable elements of crude bottoms, such as heavy sour vacuum residue into marketable products. These products are further processed to higher economic value products like jet fuel, gasoline and diesel fuel that highly demanded in the world markets. Now it is time to think on how to increase the liquid yields of gasoline and gas oil from delayed coker unit at the expense of coke formation. A simulation model has been constructed using Aspen HYSYS ver.12.1 to obtain results and to make an optimization for delayed coker unit process variables such as cracking temperature, coke drum pressure and recycle ratio to maximize gas oil yield wt%. Regression analysis has been performed using MICROSOFT EXCEL 2010 to obtain new correlations for product yield perdition and optimization studies. The findings from optimization by linear programming indicates that gas oil yield could be increased by 4 wt% instead of coke byproduct by lowering the recycle ratio to 5% wt from fresh feed and increasing the heater outlet temperature to 510°C.Also the results showed that the change in coke drum pressure has a minimal effect in product yield. The outcome from the modified process conditions studied and a profit estimated at approximately 40 million dollar yearly.