Surface tension of diethanolamine-K2CO3-water mixtures

X. Wang1, Y. Gao1 and Z. Liu1

1Xi'an Jiaotong University, P.R. China

Keywords: carbon capture and storage
property: surface tension
material: diethanolamine-K2CO3-water mixtures

There is a growing concern that anthropogenic carbon dioxide (CO2) emissions are contributing to global climate change. Carbon capture and storage (CCS) is gaining attention as an option for limiting CO2 emissions from the use of fossil fuels. The fossil fuel power plant that mainly combusts coal is the large family which emissions CO2, and once the CO2 can be recovered, it will both benefit the society and economic. Chemical absorption of CO2 is one of the most effective methods to capture CO2 by using the reaction of absorbent and CO2 and the reversible reaction to the absorbent regeneration. Alcohol amine solution absorption and carbonate solution absorption are the main current chemical absorption methods with mature technology, large absorptive amount and lower-cost, and they are both suitable for large-scale commercial separation. The surface tension of the liquid phase affects the hydrodynamics and mass transfer rates of processes where a gas-liquid interface exists, like gas absorption. Therefore to know the surface tension of these amine solutions and carbonate solutions is very important for the desigh of absorption equipment. In the present work, the surface tension of diethanolamine-K2CO3-water mixtures was determined by the Wilhelmy plate principle, and the experimental data were correlated with an empirical equation. At the same time, thermodynamic properties like surface enthalpy and surface entropy were also determined. This work has been supported by the National Science Foundation of China (Grant 51006083) and the Fundamental Research Funds for the Central Universities.

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