<P> Many gas and oil companies are considering the economic and environmental benefits of floating liquefied natural gas (FLNG). There are currently projects underway to construct five FLNG facilities . Petronas is close to completion on their FLNG - 1 at Daewoo Shipbuilding and Marine Engineering and are underway on their FLNG - 2 project at Samsung Heavy Industries . Shell Prelude is due to start production 2017 . The Browse LNG project will commence FEED in 2019 . </P> <P> Natural gas is primarily used in the northern hemisphere . North America and Europe are major consumers . </P> <P> Often well head gases require removal of various hydrocarbon molecules contained within the gas . Some of these gases include heptane, pentane, propane and other hydrocarbons with molecular weights above methane (CH 4). The natural gas transmission lines extend to the natural gas processing plant or unit which removes the higher molecular weighted hydrocarbons to produce natural gas with energy content between 950--1,050 British thermal units per cubic foot (35--39 MJ / m). The processed natural gas may then be used for residential, commercial and industrial uses . </P> <P> Natural gas flowing in the distribution lines is called mid-stream natural gas and is often used to power engines which rotate compressors . These compressors are required in the transmission line to pressurize and re-pressurize the mid-stream natural gas as the gas travels . Typically, natural gas powered engines require 950--1,050 BTU / cu ft (35--39 MJ / m) natural gas to operate at the rotational name plate specifications . Several methods are used to remove these higher molecular weighted gases for use by the natural gas engine . A few technologies are as follows: </P>

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