| 添加剂EDTA对氢氧化镁反应结晶过程的影响(英文) |
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| 引用本文： | 徐程浩,汪芳,刘代俊,陈伟. 添加剂EDTA对氢氧化镁反应结晶过程的影响(英文)[J]. 中国化学工程学报, 2010, 18(5): 761-766 |
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| 作者姓名： | 徐程浩 汪芳 刘代俊 陈伟 |
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| 作者单位： | 1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China;2. Department of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
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| 摘 要： | The effects of additive ethylenediaminetetraacetic acid (EDTA) on crystallization process were investigated by the induc-tion time of MgSO4-NaOH system. Nucleation and growth rates, growth mechanism and particle size distribution of magne-sium hydroxide precipitation were involved with. The induction time in unseeded and seeded precipitation of magnesium hydroxide with and without additive EDTA was measured. The conductivity method was used to determine the induction period. Theoretical relations of the induction time and supersaturation ratio for different growth mechanisms and a combined analysis on the induction time were applied to determine nucleation and growth rates. The growth mechanism of magnesium hydroxide precipitation was dis-closed by analyzing the experimental data with and without additive. The analysis on induction time indicated that additive EDTA had a significant influence on both nucleation and growth of magnesium hydroxide precipitation. The mechanism underlying the effect of EDTA on crystal growth was 2-dimension nucleation-mediated growth model.
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| 关 键 词： | additive kinetics nucleation crystal growth growth mechanism precipitation |
| 收稿时间： | 2010-02-24 |
| 修稿时间： | 2010-2-24 |
Effect of Additive EDTA on Crystallization Process of Magnesium Hydroxide Precipitation |
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| XU Chenghao,WANG Fang,LIU Daijun,CHEN Wei. Effect of Additive EDTA on Crystallization Process of Magnesium Hydroxide Precipitation[J]. Chinese Journal of Chemical Engineering, 2010, 18(5): 761-766 |
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| Authors: | XU Chenghao WANG Fang LIU Daijun CHEN Wei |
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| Affiliation: | 1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China;2. Department of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China |
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| Abstract: | The effects of additive ethylenediaminetetraacetic acid (EDTA) on crystallization process were investigated by the induc-tion time of MgSO4-NaOH system. Nucleation and growth rates, growth mechanism and particle size distribution of magne-sium hydroxide precipitation were involved with. The induction time in unseeded and seeded precipitation of magnesium hydroxide with and without additive EDTA was measured. The conductivity method was used to determine the induction period. Theoretical relations of the induction time and supersaturation ratio for different growth mechanisms and a combined analysis on the induction time were applied to determine nucleation and growth rates. The growth mechanism of magnesium hydroxide precipitation was dis-closed by analyzing the experimental data with and without additive. The analysis on induction time indicated that additive EDTA had a significant influence on both nucleation and growth of magnesium hydroxide precipitation. The mechanism underlying the effect of EDTA on crystal growth was 2-dimension nucleation-mediated growth model. |
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| Keywords: | additive kinetics nucleation crystal growth growth mechanism precipitation |
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