Patent
Distillative separations of gas mixtures containing methane, carbon dioxide and other components
Arthur Holmes,Ryan James M +1 more
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In this paper, the authors describe distillative separations of hydrocarbon feed mixtures containing at least methane and carbon dioxide, as well as other components, such as ethane, higher hydrocarbons, and hydrogen sulfide.Abstract:
Distillative separations of hydrocarbon feed mixtures containing at least methane and carbon dioxide, as well as other components, such as ethane, higher hydrocarbons, and hydrogen sulfide are disclosed. In the separations described, methane is preferably separated from an acid gas under conditions of composition, temperature and pressure which would normally produce acid gas solids. Acid gas solids are prevented by adding a liquid solids-preventing agent into this distillation column. A second distillation column is subsequently employed to further separate the feed gas mixture. The second distillation column is operated under conditions which an azeotrope would normally form between the light hydrocarbon and carbon dioxide, which azeotrope would limit the carbon dioxide overhead composition. The azeotrope is prevented by introducing an agent for preventing azeotrope formation. Alternatively, the second distillation column may be operated to separate carbon dioxide from hydrogen sulfide. In this case, a liquid agent is added to the second distillation column to increase the relative volatility of carbon dioxide to hydrogen sulfide. All liquid agents preferably comprise a C 3 -C 6 alkane, such as butane, or a mixture of such alkanes.read more
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References
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Patent
Method for cryogenic separation of carbon dioxide from hydrocarbons
TL;DR: In this paper, a demethanizer is used to separate high carbon dioxide content hydrocarbon feed into liquid ethane essentially free of both methane and carbon dioxide with simultaneous production of overhead gas comprising carbon dioxide without carbon dioxide icing to foul equipment by virtue of maintaining pressure at which non-gaseous carbon dioxide remains dissolved in liquid hydrocarbon.
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Method for the purification of natural gas having a high contents of acidic gases
TL;DR: In this article, a method for removing acidic gaseous components from natural gases is described, which consists of an initial desulfurization stage employing a selective solvent, then removing carbon dioxide by low temperature distillation, the carbon dioxide providing the cooling effect required for such a condensation, recovering the solvent, absorbing the residual carbon dioxide with the regenerated solvent and recycling the CO2 -laden solvent to the desulfure stage.
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Plural stage distillation of a natural gas stream
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TL;DR: In this article, a process for the recovery of light hydrocarbons from refinery gas by an expansion distillation process is described, where the refinery gas is compressed and cooled in a series of steps to liquify and remove light-hydrocarbons.
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Separating carbon dioxide and ethane by liquid-liquid extraction
TL;DR: In this paper, a method for separating a mixture of carbon dioxdie and ethane derived from a prior separation stage is described, in which a liquid-liquid extraction unit may be preceded by distillation of a carbon dioxide-ethane mixture to form the azeotrope.