초록 ▼

In the process for the recovery of e.g. LPG or NGL and sales gas from a gaseous hydrocarbon feed 11 by partially condensing the feed in heat exchanger 1 at superatmospheric pressure, separating the condensate from the uncondensed gas in gas/liquid separator 2, rectifying the uncondensed gas to produ

In the process for the recovery of e.g. LPG or NGL and sales gas from a gaseous hydrocarbon feed 11 by partially condensing the feed in heat exchanger 1 at superatmospheric pressure, separating the condensate from the uncondensed gas in gas/liquid separator 2, rectifying the uncondensed gas to produce the sales gas and stripping the condensate to produce the LPG or NGL, substantially power savings are obtained if the rectification is effected in a reflux exchanger 103 and the stripping is effected in a separate distillation column 203.

대표청구항 ▼

In a process for the separation of a light gas which contains methane and/or hydrogen, and which forms a major part (by volume) of the feed gas mixture, from a heavier stream containing C3 hydrocarbon, optionally together with C2 hydrocarbon and/or hydrocarbon containing 4 or more carbon atoms, whic

In a process for the separation of a light gas which contains methane and/or hydrogen, and which forms a major part (by volume) of the feed gas mixture, from a heavier stream containing C3 hydrocarbon, optionally together with C2 hydrocarbon and/or hydrocarbon containing 4 or more carbon atoms, which process comprises: (i) cooling the feed gas mixture at superatmospheric pressure to partially condense it, (ii) separating the condensate from the uncondensed gas, (iii) rectifying the uncondensed gas to produce said light gas, and (iv) stripping the condensate to produce said heaver portion, the improvement by which the light gas is obtained at a pressure close to that of the feed gas, comprising: effecting said rectification of said uncondensed gas in step (iii) by passing uncondensed gas upwards, at substantially the same pressure as that at which it is obtained from step (ii), while further cooling the uncondensed gas to partially condense it, whereby the liquid condensed out of said gas flows downwards in counter-current fashion in contact with the rising gas and forms a mixture with condensate formed by the partial condensation; prior to said stripping step (iv), warming said condensate by indirect heat exchange with the feed gas mixture; and effecting said step (iv) by stripping of said condensate in a stripping column to produce said heavier portion.