Thermosyphon reboiler FOR denitrogenation of liquefied natural gas

摘要

The denitrogenation of an expanded crude LNG stream (104) is conducted in a nitrogen rejection column (150) reboiled by partial vaporization of only a portion (112) of nitrogen bottoms liquid in a thermosyphon reboiler (106) that cools the crude LNG stream before or after expansion (102). The thermosyphon reboiler can be located external of or within the sump of the column.