LPG Recovery System
LPG (liquefied Petroleum Gas) can be obtained from natural gas (or from refinery gases) by cooling the gas through the so-called Joule-Thomson effect. When high pressure natural gas (Methane, Ethane, Propane and heavier gases) undergoes an adiabatic expansion (without any heat or work exchange with the surroundings), a concomitant temperature decrease is obtained. In case of gaseous mixtures, this can be used to condense the less volatile components and to recover them separately in the liquid state (LPG). The system produced by Sime allows to obtain LPG through the use of a new-conception Joule-Thomson valve, with a new design that reduces friction during the expansion and consequently limits the basic inefficiency of the ordinary Joule-Thomson pressure reducing valve. This provides lower final temperatures in comparison with the ones that are usually obtained today and therefore increases the quantity of recovered LPG. Process overview The high pressure gas undergoes an expansion (without any heat or work exchange) with a good isentropic efficiency in which a cooling occurs that causes a partial liquefaction. No special dehydration treatment for the gas is required, because the temperature for the formation of the hydrates is controlled upstream and through the expansion valve that is designed in order to avoid hydrate growing and plugs. Why separate and recover Heavy Hydrocarbons in liquid state.
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