الفهرس 
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Abstract
The present work discusses ways of saving energy in the different stages of conversion of gas-to- liquids, GTL, as well as modeling of the Fischer- ‘rropsch slurry reactor.
In the synthesis gas production stage, the concept of auto thermal reforming process which combines both steam reforming and partial oxidation is a milestone towards energy conservation in this stage. This process takes the advantage of the exothermal reaction taking place in the partial oxidation process to supply the heat required by the endothermic steam reforming reaction and in the same time produces synthesis gas with the l-12/CO ratio required by the Fischer-Tropsch reaction chemistry.
Process integration between the three-steps GTL process can save the naturaL gas feed stock and improve its utilization efficiency.
On process rather Uiati recyc1. can provide a combined cycle power generation plant with its needs of high, medium and Low pressure steam, so produced as byproducts. Additionally unconverted and produced gas can be used to generate electricity using gas turbines. The co-produced electricity saleable byproduct improves the economics of GTL process.
Energy eonservtion in the pilot scale slurry-phase FT AFDU demonstration plant at Laport Texas USA has been attempted in this work. The transshipment rodel for minimum energy utilization developed at the Egyptian Petroleum Research Institute las been utilized together with UNDO linear programming solver to establish minimwn energy utilization. Five assigned minimum temperature difTerences, iTmjn namely; 10, 20, 30, 40 and 50 °C were utilized. The results indicated that hot utility was not needed until = 30 °C. The heat content of the hot streams was enough to heat the cold streams to their target temperatures, only cold utility was required. Thus a total saving of the hot utility was possible. The minimum cost heat exchanger network was chosen among the designed networks.