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Effect of fine solid particles on absorption
rate of gaseous CO |
| LU Sumin1, MA Youguang2, SHEN Shuhua2, ZHU Chunying2 |
| 1.Department of Material and Chemical, Tianjin Polytechnic University; 2.School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University |
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Abstract The influence of the properties of solid particles in slurry on the absorption of CO2 in the slurry was investigated in a stirred thermostatic reactor. The absorption experiments were carried out in three different slurries consisting of water, cyclohexane and soybean oil, respectively, and three kinds of solid particles (active carbon, active alumina and silica gel) were incorporated into each of the above mentioned slurries separately. The experimental results show that the active carbon particles could enhance the absorption rate of gaseous CO2 in the aqueous slurry, while in the cyclohexane slurry, active carbon particles indicated no the absorption enhancement effect. However, it was observed that the active alumina and silica gel particles could enhance the absorption rate of CO2 in the cyclohexane slurry. These phenomena indicate that the solid particles, which could enhance the gaseous CO2 absorption rate, should possess two properties simultaneously, i.e. they rejected the solvent and had higher adsorption capacity for the solute. The experimental results also show that, as for those solid particles which could enhance the gas absorption rate, the enhancement increased quickly with the increase of solid concentration in slurry at first, and then reached a constant value gradually. It was also found that the enhancement factor was related to the coverage fraction of solid particles on the gas-liquid interface, and due to the reduction of surface fraction with increasing stirred speed, the enhancement factor decreased.
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Issue Date: 05 December 2008
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