Solubility and diffusivity of CO₂ in n-butanol+ N235 system and absorption mechanism of CO₂ in a coupled reaction-extraction process

Abstract

The absorption of CO₂ in insoluble organic amine is crucial for understanding the mechanism of coupled reaction-extraction-crystallization process between aqueous chloride and CO₂. In this study, the solubility and diffusivity of CO₂ in n-butanol+ N235 system were measured and reported. The absorption of CO₂ in the system is a physical absorption behavior and the solubility of CO₂ decreases with the increase of the mass fraction of N235. The diffusivity of CO₂ increases firstly and then decreases with the increase in the mass fraction of N235. Moreover, the absorption mechanism of CO₂ in the coupled reaction-extraction-crystallization process was investigated and identified by experiments. The results indicated that in the coupled reaction-extraction-crystallization process, CO₂ is absorbed by the aqueous phase rather than by the organic phase and further transferred into the aqueous phase.

Key words： carbon dioxide; N235; solubility; diffusivity; coupled process

References

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