| 摘要 |
<p>The invention relates to a method for removing a nitrogen rich fraction from a feed fraction which substantially contains nitrogen and hydrocarbons, wherein the feed fraction is partially condensed and is separated into a nitrogen-rich and a methane-rich fraction by rectification. According to the invention, during an interruption of the feed of the feed fraction, the heat exchanger (E2) provided for the separating column (s) (T1/T2) used for the rectification separation and the method currents occurring for the partial condensation (E1) of the feed fraction and the cooling and heating of the method currents occurring during the rectification removal are held on a temperature level that is substantially equal to the temperature level during normal operation of the separating column (s) (T1/T2) and the heat exchanger (E1, E2) by means of one or a plurality of different cooling media (6 â 11).</p> |
