Experiments On The Kinetics And Viscosity Of Carbonated DEEA Aqueous Solution

Kinetics and viscosity are very important parameters of the CO₂ adsorption because they have a great effect whenever CO₂ penetrates from the gas phase to the liquid phase or is enhanced adsorption.In this work, the solubility and absorption rate of CO₂ in DEEA aqueous solution with different mass fractions of DEEA（wDEEA ranging from 0.3 to 0.5） were measured at normal pressure with temperatures ranging from 303.2 to 323.2K. The viscosities of CO₂ unloaded and CO₂ loaded DEEA aqueous solutions were measured by using the NDJ-5S digital rotational viscometer. The experimental data were modeled by using the Weiland equation. The effects of temperature, mass fractions of DEEA and CO₂ loading on the viscosities were demonstrated on the basis of experiments.Our results show that:（1） When DEEA quality fraction must, as the temperature rises, the CO₂ solubility decrease.（2） When the temperature is, the CO₂ solubility with DEEA quality score rate increases.（3） The viscosities of both CO₂ unloaded and CO₂ loaded DEEA aqueous solutions decrease with the increase of temperature.（4） For CO₂ unloaded DEEA aqueous solutions, the viscosities tend to increase with increasing wDEEA in the case of wDEEA less than 0.8, however, exceeding this value, the viscosities decrease with increasing wDEEA. For CO₂ loaded DEEA aqueous solutions, the viscosities increase with increasing wDEEA when wDEEA ranges from 0.3 to 0.5.（5） With the increase of CO₂ loading, the viscosities of carbonated DEEA aqueous solutions increase.（6）The Weiland equation can correctly capture the effects of CO₂ loading, mass fraction of amine, and temperature on the viscosities, and satisfactorily fit the experimental data.