C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
162/113, 260/719
C07C 7/10 (2006.01) C07C 9/02 (2006.01) C10L 3/10 (2006.01)
Patent
CA 1316547
IMPROVED PROCESS FOR RECOVERING NATURAL GAS LIQUIDS ABSTRACT OF THE DISCLOSURE An improvement in a process is provided for treating a moisture-containing natural gas stream to recover an improved yield of liquified heavy hydrocarbons (i.e. natural gas liquids or NGL's). More particularly, the process begins by dehydrating the wet natural gas stream to reduce the water content thereof to less than about 1 ppm. The dried natural gas is chilled to a temperature in the range of -40°F to -50°F to condense the NGL's from the natural gas. The present improvement provides that the chilled, dried gas, from which some NGL's are condensed, is further cooled to a temperature in the range of between about -70°F to -80°F by expanding the gas through a Joule Thomson valve prior to its introduction into a conventional low temperature separator. In the separator, hydrocarbon liquids drop out and a chilled, overhead hydrocarbon gas stream is produced. The hydrocarbon liquids are passed to a downstream fractionation column to remove the gases entrained in the NGL. The NGL's are then recovered at the base of the column. The overhead vapours from the fractionator are introduced into a very cold absorber, called a SCAU (Super Cooled Absorption Unit) after expanding the gas from the fractionator pressure to the absorption pressure by means of a Joule Thomson valve and in the process reducing the temperature to liquify the stream substantially. The overhead hydrocarbon gas stream from the low temperature separator is then contacted counter-currently with the partially liquified overhead stream from the fractionation column, in the SCAU. In the SCAU, a large portion of the propane and substantially all of the heavier hydrocarbon components in the hydrocarbon gaseous feed stream are recovered. The overhead vapour phase is the Sales Gas from the process.
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