Base for a mass-transfer column

A tray for a mass-transfer column, wherein the tray is configured to permit contact between a liquid phase and a gas phase, the tray comprising:

• a tray inlet via which the tray is supplied with the liquid phase, the tray inlet comprising a first entrance;
• a tray outlet via which the liquid phase runs out of the tray, the tray outlet comprising a first exit;
• first guide means for guiding the liquid phase, wherein the first guide means forms a first flow path along which the liquid phase flows from the tray inlet to the tray outlet, wherein the first guide means comprises a spiral guide weir arrangement that in a spiral manner forms the first flow path between the first entrance and the first exit;
• an inlet for a temperature-control fluid;
• an outlet for the temperature-control fluid;
• and
• second guide means for guiding the temperature-control fluid for heat exchange with the liquid phase, wherein the second guide means forms a second flow path that overlaps with the first flow path and leads from the inlet to the outlet and the temperature-control fluid flows along the second flow path in a direction opposite to a flow direction of the liquid phase.