Method and absorber for removal of acid gas from natural gas

摘要

The invention relates to a continuous process for removal of acid gas, such as carbon dioxide (CO2) from a fluid stream, such as natural gas comprising mainly hydrocarbons, by means of a absorbent medium in a rotating absorption zone. Subsequently, the acid gas is desorbed in a rotating desorption zone from the absorbent medium to allow the absorbent medium to be recirculated and the acid gas is removed for storage or drying and processing. This process can be carried out continuously, as the absorption medium is re-used.

主权项

1. A process for removing acid gases from a fluid stream comprising the steps of:
supplying a pressurized fluid stream and a lean absorption medium comprising a liquid diluent and at least one amine to an absorber; passing the fluid stream, which is in contact with the lean absorption medium within a rotating absorption zone in the absorber, wherein the acid gases are removed from the fluid stream by the lean absorption medium when passing through the rotating absorption zone; passing rich absorption medium containing said acid gases into a first rotating desorption zone within a desorber, wherein a first portion of the acid gases are removed from the rich absorption medium by means of a heated vapour to obtain a partially regenerated absorption medium, passing the partially regenerated absorption medium into a second rotating desorption zone within the desorber; wherein a remaining portion of the acid gases are removed from the partially regenerated absorption medium by heating the partially regenerated absorption medium to evaporate said acid gases and a portion of the partially regenerated absorption medium containing amine and liquid diluent so as to form a vapour; passing said formed vapour through said first rotating desorption zone; and passing said formed vapour to a rotating condenser within the desorber, wherein the diluent is condensed and the acid gases are removed.