| 摘要 |
<p>A process for reliquefying a methane-rich fraction, especially boil-off gas, is described. In this process, a) the methane-rich fraction (1) is compressed (C1) to a pressure at least 20% above the critical pressure of the fraction to be compressed, b) liquefied and subcooled (E2), c) decompressed (V1) to a pressure between 5 and 20 bar, and d) separated into a gaseous nitrogen-rich (4) and a liquid nitrogen-depleted fraction (7), and e) the nitrogen-depleted fraction (7) is decompressed (V2) to a pressure between 1.1 and 2.0 bar, f) wherein the gaseous fraction (8) obtained is added to the methane-rich fraction (1) without being warmed up and compressed, and g) the liquid product fraction (9) which is obtained in the decompression of the low-nitrogen fraction has a nitrogen content of≤1.5 mol%.</p> |
