Absorption of CO 2 in a suspension of lime

Abstract

The kinetics of absorption of lean CO 2 in a suspension of lime was studied in 5 and 20 cm i.d. bubble columns and a 12.5 cm i.d. mechanically aginated contactor. The absorption of CO 2 is accompanied by a fast pseudo first order reaction. The rate of absorption in a batch of a suspension of lime remains essentially constant up to a level of carbonation of about 90 per cent and thereafter it decreases, due to the resistance associated with the dissolution of solids. The published data in the literature and the reported mechanism have been reanalyzed.