GTL: Innovations in Diesel Yield Improvement
- Mostafa Shahin (Qatar)
- Document ID
- World Petroleum Congress
- 21st World Petroleum Congress, 15-19 June, Moscow, Russia
- Publication Date
- Document Type
- Conference Paper
- 2014. World Petroleum Council
- 0 in the last 30 days
- 57 since 2007
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GTL Diesel is the main product of ORYX GTL. This paper is discussing improvements implemented at ORYX GTL in order to maximize this valuable product. Major factors contribute to maximizing GTL Diesel Yield, are mainly HCU reactor catalyst type, HCU reactor conversion and Advanced Process Control methodology implemented over the HCU reactor and fractionation column control systems. Reactor high CAT and high conversion is increasing the GTL Diesel Yield but affect negatively on the HCU catalyst life time, so it is required to operate the HCU reactor within an optimum zone to produce maximum diesel yield and maintain the HCU catalyst activity as long as possible.
ORYX GTL is a joint venture between Qatar Petroleum and Sasol Synfuels International; it is located in Ras Laffan Industrial City in Qatar. In 2003, ORYX GTL was founded to produce GTL products: GTL Diesel, GTL Naphtha and LPG. These products were first introduced to the market in 2007. Since then, GTL products have been meeting the market needs for GTL Diesel fuel as a blend stock, GTL Naphtha as a petrochemical feedstock and LPG as an export fuel.
GTL is a process of converting natural gas into synthetic oil that can be further processed into useful hydrocarbon products. The GTL process reassembles synthetic gas, or syngas, molecules (produced from Natural Gas reforming) into longer chain molecules, similar to those that comprise crude oil. The technology used is based on Fischer-Tropsch synthesis. The Fisher-Tropsch process was developed by Franz Fischer and Hans Tropsch at the "Kaiser-Wilhelm-Institut für Kohlenforschung" in Mülheim Van der Ruhr (Germany) in 1925.
In the FT process, the feedstock used to produce syngas can be solid (coal), liquid (refinery residuals) or gaseous (natural gas). GTL refers specifically to the conversion of gaseous feedstocks to an extremely pure synthetic crude oil that is virtually free of contaminants such as sulphur, aromatics and metals. This synthetic crude that consists of Wax and Condensate can be refined into products such as diesel fuel, naphtha, wax and other liquid petroleum or specialty products by further processing in a hydrocracker unit, where the synthetic crude is cracked in the presence of hydrogen, and then fractionated into the desired hydrocarbon products slates.
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