Carbon Dioxide Absorption Investigated in Micro Reactors

3 Carbon Dioxide Absorption Investigated in Micro Reactors Cas/liquid reaction 22 [CL 22] Add-base reaction between carbon dioxide and sodium hydroxide 

Since many different gas/liquid contactors were used, the experimental conditions differed for each device and the reader is referred to the listing in the original reference [5], The liquid flows range from 10 to 1042 ml h and the gas volume flows from 180 to 25 020 ml h. The corresponding residence times were 0.01-19.58 s. The ratio of carbon dioxide to sodium hydroxide was fixed at 0.4. 

The carbon dioxide volume content was varied from 0.8 to 100 vol.-% the gas velocity changes from 0.1 to 42.9 mm s [5]. The residence time varied from 0.1 to 9.7 min 64 single streams of a liquid film thickness of 65 pm were used at a total volume flow of 50 ml h . The ratio of carbon dioxide to sodium hydroxide was fixed at 0.4. 

Mass transfer efficiency by conversion analysis - benchmarking to mixing tee 

The two micro bubble columns comprising the smaller micro channels reached nearly 100% conversion [5], The micro bubble column with the largest hydraulic diameter reached at best 75% conversion. The curve obtained displays the typical shape, passing through a maximum due to the antagonistic interplay between residence time and specific interfacial area. 

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