Method and device for separating a fluid mixture using deep temperature distillation, in particular for acquiring pure krypton

摘要

The method involves guiding utilization fluid (1) into a separating column (2), and condensing main gas of the column in a main condenser (5). A part of the condensate is provided as reflow fluid (20), and another part of the condensate is guided into a buffer container (10), where the container is arranged above material exchanging elements (3, 4) of the column. The parts of the condensate are commonly guided into the container, and the reflow fluid is removed from the container, where fluid buffer volume of the container is larger than material exchanging volume of the column. An independent claim is also included for a device for separating heavy contaminations in fluid mixture comprising a buffer container.