| 摘要 |
<p>A process and apparatus for the separation of carbon dioxide (CO2) from a gaseous feed comprising methane and carbon dioxide wherein the apparatus comprises a first fractionation column 210 including a first reboil heat exchanger 115 and a second fractionation column 255 including a second reboil heat exchanger 125. A means is provided for cooling and partially condensing the gaseous feed in heat exchange with boiling liquid in the first reboil heat exchanger, and further cooling and partially condensing the cooled and partially condensed gaseous feed in heat exchange with boiling liquid in the second reboil heat exchanger. A means is provided for feeding at least a portion of the further cooled and partially condensed gaseous feed to the first fractionation column, for separation into a first bottom stream 220 having a carbon dioxide concentration higher than that of the gaseous feed and a first overhead stream 225 having a methane concentration higher than that of the gaseous feed. A means is provided for feeding at least a portion of the first overhead stream to the second fractionation column, for separation into a second bottom stream 260 having a carbon dioxide concentration higher than that of the first overhead stream and a second overhead stream 285 having a methane concentration higher than that of the first overhead stream. The process and apparatus is useful for the separation of gaseous mixtures comprising methane and at least 10 mol% carbon dioxide, is effective over wide ranges of carbon dioxide and hydrocarbon content, and requires reduced refrigeration and power consumption.</p> |
