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A process for the fractionation of a gaseous mixture containing hydrogen, light aliphatic hydrocarbons and light aromatic hydrocarbons wherein following compression of the mixture and separation of one or more light fractions, a gas is contacted with light aliphatic hydrocarbons and then hydrogen is

A process for the fractionation of a gaseous mixture containing hydrogen, light aliphatic hydrocarbons and light aromatic hydrocarbons wherein following compression of the mixture and separation of one or more light fractions, a gas is contacted with light aliphatic hydrocarbons and then hydrogen is separated by permeation. A series of distillation steps makes it possible to isolate the aliphatic hydrocarbons and the aromatic hydrocarbons subsequent to the separations.

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A process for the fractionation of a gaseous mixture containing hydrogen, light aliphatic hydrocarbons and light aromatic hydrocarbons, which comprises effecting the following stages: a) cooling said mixture to condense a part of the hydrocarbons to form a first condensed aromatics enriched liquid f

A process for the fractionation of a gaseous mixture containing hydrogen, light aliphatic hydrocarbons and light aromatic hydrocarbons, which comprises effecting the following stages: a) cooling said mixture to condense a part of the hydrocarbons to form a first condensed aromatics enriched liquid fraction and separating a first non-condensed, aromatics-depleted gaseous fraction and the first condensed aromatics-enriched liquid fraction; b) raising pressure of the first non-condensed aromatics-depleted gaseous fraction and then cooling said first gaseous fraction to form a second liquid fraction and a second non-condensed gaseous fraction and separating the second liquid fraction and the second non-condensed gaseous fraction; c) contacting the second gaseous fraction with an aliphatic hydrocarbon liquid phase containing at least one hydrocarbon having 3 to 5 carbon atoms, in a contact zone, under conditions ensuring vaporization of at least one C3-C5 fraction of the aliphatic hydrocarbon liquid phase and condensation of at least part of the aromatic hydrocarbons of the second gaseous fraction and separating a third gaseous fraction from a third liquid fraction; d) treating the third gaseous fraction to bring the third gaseous fraction to above its dew point and circulating the third gaseous fraction in contact with at least one hydrogen-permeable diaphragm and collecting a hydrogen-enriched gaseous fraction and a fourth hydrogen-depleted gaseous fraction; e) cooling the fourth gaseous fraction to partly condense the fourth gaseous fraction and collecting a fifth methane-enriched gaseous fraction and a fourth liquid fraction containing at least one hydrocarbon having 3 to 5 carbon atoms; f) effecting distillation together or separately of the first, second, third and fourth liquid fractions in a distillation system and collecting at least one sixth gaseous fraction, containing at least one C3-C5 hydrocarbon and at least one fifth liquid fraction containing aromatic hydrocarbons; and g) condensing at least part of the hydrocarbons of the sixth gaseous fraction and supplying the condensed hydrocarbons to a contact zone of stage c) in order to comprise at least a part of the aliphatic hydrocarbon liquid phase.