Process of Liquefaction

The Natural Gas that is used to meet power, commercial and domestic needs throughout the world is over 90% pure methane, the lightest occurring hydrocarbon with the lowest carbon footprint.Although predominantly methane, the “Feed Gas” from the interior of Oman also contains “sour gases” (in Oman mainly carbon dioxide, CO2), water (H2O), some mercury and heavier hydrocarbons. These need to be removed before the methane can be cooled to liquefied Natural Gas (LNG).

The process of producing LNG is in three steps.

Feed gas from the interior  
Step 1- Treatment (Remove CO2, Water (H2O) and mercury from the Feed Gas) Acid gas (mainly carbon dioxide), water and mercury are removed from the gas delivered to Oman LNG. This clean-up” is a necessary step to enable liquefaction of the natural gas and a safe product for our customers.
Step 2 – Removal of “Condensates” (Remove heavier hydrocarbons (NGL’s) by Fractional Distillation) Condensates (natural gas Liquids made up mainly of pentane and hexane) are removed by Fractional Distillation of the feed Gas after treatment.
Step 3 – Liquefaction of Natural Gas(Cool remaining light hydrocarbons to-162ºC to liquefy) The gas (now mainly methane) is sent to the Main Cryogenic Heat Exchange (MCHE), where it condenses to liquid at -162°C. The liquid is sent to special storage tanks awaiting shipment by LNG vessels to customers in Asia and Europe.