الفهرس 
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Abstract
Abu Qir Fertilizers Company is the main consumer for the sales gas produced by ”WEPCQ” on-<,hore gas processing plant. They utilize the sales gas in both:
1- Fertilizers production (catalytic reforming of methane to produce carbon monoxide and hydrogen in order to manufacture ammonia, urea, nitric acid and ammonium nitrate). 2- Fuel gas combustion for both heating and power generation requirements.
Sales gas produced by ”WEPCQ” is sold with a relatively high heating value, which represents an economic loss, since it contains appreciable quantities of ethane and heavier (C2+) components which have valuable market values if sold either as individual products; ethane and propane products, or even as LPG mixture, i.e., propane / butanes mixture.
From the above mentioned idea, this study was carried out to evaluate, from both the technical and economical points of view, the benefits of retrofitting of A/Q LPG plant for NGL (C2+) recovery in order to fulfill the following objectives:
1- Feeding the fertilizers company with its sales gas requirements (quality and quantity) in the form of methane only, i.e., NGL recovery mode, or a mixture of methane and heavier component(s), i.e., NGL rejection mode.
2- Recovery of the lost C2+ products in sales gas since they have high market values. 3- Maximizing LPG and condensate productions.
Technical Study
The technical work was carried out as follows:
1- Creating simulation models using HYSYS.plant steady-state simulation software (the most famous process simulator, a product of Hyprotech Ltd., Calgary, Canada) for:
a- The off-shore platforms with their related sea lines. b- The on-shore condensate stabilization plant.
c- The existing LPG recovery plant (the base case). d- The proposed NGL recovery plant (C2+ recovery).
2- Discussion of the simulation results.
3- Checking the capacities and duties of the existing plant equipment which can be utilized in the proposed mode of operation in order to decrease the required modifications and purchased equipment.
4- Discussion of the proposed plant requirements.
Economical Evaluation
The economical evaluation was carried out to evaluate the economic yield gained from C2+ recovery, i.e., cost of modifications and return on investment (pay-back period).