Process for dehydrating gas

摘要

A process for the removal of water from gas which comprises an absorption step of bringing a gas (1) saturated with water vapour into gas-liquid contact with a water-lean absorbing liquid (3) comprising a water absorbing liquid having a cloud point temperature above the freezing point of water whereby water vapour present in the gas is absorbed into the water-lean absorbing liquid at a temperature below its cloud point to produce a refined gas (4) having a reduced water vapour content and water-loaded absorbing liquid (5); and a regeneration step of heating the water-loaded absorbing liquid (5) to above the cloud point temperature of the absorbing liquid whereby the water-loaded absorbing liquid separates into a water-rich phase (7) and an absorbing liquid-rich phase (8) and cooling the absorbing liquid-rich phase to a temperature below its cloud point prior to recycling the absorbing liquid-rich phase for use as water-lean absorbing liquid (3) in the absorption step.