| 不同浓度KCl和NH4Cl溶液中H3BO3介稳区的性质 |
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| 引用本文： | 孔凡志,董亚萍,孟庆芬,彭姣玉,李武. 不同浓度KCl和NH4Cl溶液中H3BO3介稳区的性质[J]. 高等学校化学学报, 2011, 32(11): 2635-2639 |
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| 作者姓名： | 孔凡志 董亚萍 孟庆芬 彭姣玉 李武 |
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| 作者单位： | 1. 中国科学院青海盐湖研究所, 西宁 810008; 2. 中国科学院研究生院, 北京 100049 |
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| 基金项目： | 国家“十一五”科技支撑计划(批准号:2006BAB09B07); 中国科学院科技支持青海项目(批准号:0810021007)资助 |
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| 摘 要： | 测定了H3BO3在0~25 ℃内于不同浓度KCl和NH4Cl溶液中的溶解度和超溶解度, 得到了H3BO3的介稳区宽度, 并推算出表观成核级数m, 给出了成核速率方程. 研究了KCl和NH4Cl对H3BO3介稳区性质的影响, 并对影响的机理进行了探讨. 结果表明, KCl使H3BO3介稳区向低温方向移动; NH4Cl使H3BO3介稳区向高温方向移动; 根据所得结论分析了KCl和NH4Cl在柴达木西部油田水析硼过程中的影响, 认为KCl和NH4Cl在蒸发过程中浓度的变化是造成硼分散析出而不能富集的因素之一.
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| 关 键 词： | 硼酸 氯化钾 氯化铵 介稳区 溶解度 超溶解度 |
| 收稿时间： | 2010-12-20 |
Metastable Zone Properties of H_3BO_3 in Different Concentrations of KCl and NH_4Cl Solutions |
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| KONG Fan-Zhi,DONG Ya-Ping,MENG Qing-Fen,PENG Jiao-Yu,LI Wu. Metastable Zone Properties of H_3BO_3 in Different Concentrations of KCl and NH_4Cl Solutions[J]. Chemical Research In Chinese Universities, 2011, 32(11): 2635-2639 |
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| Authors: | KONG Fan-Zhi DONG Ya-Ping MENG Qing-Fen PENG Jiao-Yu LI Wu |
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| Affiliation: | 1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;2. Graduate School of Chinese Academy of Sciences, Beijng 100049, China |
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| Abstract: | The solubility and ultra solubility of boric acid in aqueous were measured in the presence of different concentrations of KCl and NH4Cl from 0 ℃ to 25 ℃. The metastable zones and the crystal nucleation orders of H3BO3 were calculated. Effects and action mechanism of KCl and NH4Cl on metastable zone property of H3BO3 were studied. The result shows that the existence of KCl makes the metastable zone of H3BO3 move to higher temperature by increasing solubility of H3BO3. According to the adsorption effect, NH4Cl makes metastable zone of H3BO3 move to lower temperature. Concentration variation of KCl and NH4Cl in evaporation of Nayishan oilfield brine is one of the reasons that boron crystallizes dispersedly. |
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| Keywords: | H3BO3 KCl NH4Cl Metastable zone Solubility Ultra solubility |
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