| Kinetics and rate-limiting mechanisms of dolomite dissolution at various CO_2 partial pressures |
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| 作者姓名： | 刘再华 DreybrodtWolfgang |
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| 作者单位： | LIU Zaihua Dreybrodt WolfgangKarst Dynamics Laboratory，MLR，Institute of Karst Geology，Chinese Academy of Geology Sciences，Guilin 541004，China;FB1-lnstitut fUr Experimentelle Physik，Universitat Bremen，Bremen 28334，Deutschland |
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| 基金项目： | the National Natural Science Foundation of China (Grant No.
40073026), the Ministry of Land and Resources of China (Grant No. 9806), the Ministry of Science and Technology of China (Special Research Project for Social Commonweal) (Grant No. 164), the Na |
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| 摘 要： | Techniques of rotating-disk and catalyst were used in investigating the kinetics of dolomite dissolution in flowing CO2-H2O system. Experiments run in the solutions equilibrated with various CO2 partial pressures (PCO2) from 30 to 100000 Pa. It shows that dissolution rates of
dolomite are related with rotating speeds at conditions far from equilibrium. This was explained by modified diffusion boundary layer (DBL) model. In addition, the dissolution rates increase after addition of carbonic anhydrase (CA) to solutions, where the CA catalyzes CO2 conversion. However, great differences occur among various CO2 partial pressures. The experimental observations give a conclusion that the modified DBL model enables one to predict dissolution rates and their behaviour at various PCO2 with satisfactory precision at least far from equilibrium.
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Kinetics and rate-limiting mechanisms of dolomite dissolution at various CO_2 partial pressures |
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| LIU Zaihua Dreybrodt WolfgangKarst Dynamics Laboratory,MLR.Kinetics and rate-limiting mechanisms of dolomite dissolution at various CO_2 partial pressures[J].Science in China(Chemistry),2001(5). |
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| Authors: | LIU Zaihua Dreybrodt WolfgangKarst Dynamics Laboratory MLR |
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| Institution: | LIU Zaihua Dreybrodt WolfgangKarst Dynamics Laboratory,MLR,Institute of Karst Geology,Chinese Academy of Geology Sciences,Guilin 541004,China,FB1-lnstitut fUr Experimentelle Physik,Universitat Bremen,Bremen 28334,Deutschland |
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| Abstract: | Techniques of rotating-disk and catalyst were used in investigating the kinetics of dolomite dissolution in flowing CO2-H2O system. Experiments run in the solutions equilibrated with various CO2 partial pressures (PCO2) from 30 to 100000 Pa. It shows that dissolution rates ofdolomite are related with rotating speeds at conditions far from equilibrium. This was explained by modified diffusion boundary layer (DBL) model. In addition, the dissolution rates increase after addition of carbonic anhydrase (CA) to solutions, where the CA catalyzes CO2 conversion. However, great differences occur among various CO2 partial pressures. The experimental observations give a conclusion that the modified DBL model enables one to predict dissolution rates and their behaviour at various PCO2 with satisfactory precision at least far from equilibrium. |
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| Keywords: | dolomite dissolution rate diffusion boundary layer CO2 conversion CO2 partial pressure |
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