| 摘要 |
A method is disclosed for separating a mixture of carbon dioxdie and ethane derived from a prior separation stage. The separation is accomplished by liquid-liquid extraction of a liquefied azeotrope of carbon dioxide and ethane with a liquid hydrocarbon having at least three carbon atoms, that is, propane, or a heavier hydrocarbon, or a mixture of hydrocarbons. The liquid-liquid extraction unit may be preceded by distillation of a carbon dioxide-ethane mixture to form the azeotrope. The ethane and extraction hydrocarbon may be separated in a subsequent distillation stage. The method is useful in carbon dioxide separation facilities where it is desirable to recover ethane that would otherwise be lost.
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