DOI: 10.5176/2301-3761_CCECP15.30

Authors: Guan-He Chen, Meng-Hui Li, and Rhoda B. Leron

Abstract:

In this work, the physical solubility of CO2 in the mixed amine system [diethylenetriamine (DETA) + piperazine (PZ) + water] was investigated. The total amine concentration was fixed at 30 wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} while the amine ratio was varied at (26 wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} DETA/4 wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} PZ), (22 wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} DETA/8 wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} PZ), and (18 wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} DETA/12 wt{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} PZ). The solubility experiments were performed at temperatures 303.2 K, 308.2 K, and 313.2 K and atmospheric pressure using N2O as the solute gas. By applying the N2O analogy, the solubility of CO2 in each solvent system was estimated from the corresponding N2O solubility. A semi-empirical model expressed in terms of a differential (excess) Henry’s coefficient was used to correlate the measured solubility data with temperature and amine concentration. The predicted data for the solubility of N2O in the studied amine systems at different temperatures were found to agree with the experimental data at an average absolute deviation of 0.7{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}. Such results suggest that the model can be conveniently used, along with the obtained parameters in this work, in predicting the solubility of N2O in the studied amine systems. Consequently, by applying the N2O analogy, the solubility of CO2 in the solvent can easily be estimated.

Keywords: Henry’s law constant; N2O analogy; diethylene-triamine; piperazine

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