Abstract
In the previous report (AIChE J., 50, 871-878, 2004), a new type of the injection method of liquid CO2 by a static mixer was proposed by the present authors for the direct ocean disposal of CO2 at the intermediate depths (500-1500 m). The static mixer is effective for producing liquid CO2 drops with uniform size distribution, and would have advantages of the drop size control over simple nozzle injection methods. In this study, the mixing behavior of liquid CO2 and water and its effects on the CO2 drop formations in the Kenics type static mixer was observed in a laboratory-scale experimental apparatus simulating the intermediate ocean conditions. It was found that the size reduction and uniformalization of the liquid CO2 drops were mainly conducted at the first 2 element at the upstream side of the mixer. After that, the size and its deviation decreased quite gradually without coalescence of the drops.