| 摘要 |
<p>A distillative method for separating an acid gas component, such as carbon dioxide, from a light hydrocarbon component, such as ethane. In one embodiment, a mixture containing carbon dioxide and ethane is introduced into a distillation column (14) containing a plurality of vapor-liquid contact devices. The column is then operated under conditions of pressure, temperature and composition to produce an enriched carbon dioxide overhead stream (20), but which conditions also would normally result in a substantial amount of ethane being present in the overhead due to the azeotropic nature of carbon dioxide/ethane mixtures at high carbon dioxide concentrations. To prevent azeotrope formation, an agent is introduced into the distillation column which agent significantly alters the relative volatility between carbon dioxide and ethane to prevent azeotrope formation thereby removing the concentration limitation on carbon dioxide concentration in the overhead stream. </p> |
