| 铬酸钠碳氨转化过程的相图分析 |
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| 引用本文： | 刘昌见,张懿. 铬酸钠碳氨转化过程的相图分析[J]. 物理化学学报, 2004, 20(11): 1335-1338. DOI: 10.3866/PKU.WHXB20041110 |
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| 作者姓名： | 刘昌见 张懿 |
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| 作者单位： | Institute Process Engineering, Chinese Academy of Sciences, Beijing 100080; The Key Laboratory of Catalysis, China National Petroleum Corporation, University of Petroleum, Beijing 102249 |
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| 基金项目： | 国家高技术研究发展规划(863项目)(2001AA647010)，中国科学院“九.五”资源环境重大项目(KZ95T-05)资助~~ |
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| 摘 要： | 研究了铬酸钠碳氨转化过程中Na＋, NH4+// CrO42－, HCO3－-H2O体系的溶解度和相图.根据溶解度和相图对铬酸钠的氨水溶液碳氨转化过程固相析出行为进行分析.结果表明: 相图中存在NaNH4CrO4·2H2O复盐结晶区,浓度较高的铬酸钠氨水溶液转化过程中NaC(HO)3、(NH4)2CrO4和NaNH4CrO4·2H2O结晶可能同时析出,形成混晶.为避免同时析出铬酸铵、碳酸氢钠结晶,铬酸钠氨水初始溶液浓度应稍低于相图中P2(P2′)对应的组成,即为1 g H2O中Na2CrO4 0.8633～1.1377 g,氨0.0611～0.0986 g.
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| 关 键 词： | 铬盐 清洁工艺 溶解度 相图分析 |
| 收稿时间： | 2004-03-02 |
| 修稿时间： | 2004-03-02 |
Phase Diagram Analysis of the Carbonation Process of Sodium Chromate and Ammonia Solution |
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| Liu Chang Jian, Zhang Yi. Phase Diagram Analysis of the Carbonation Process of Sodium Chromate and Ammonia Solution[J]. Acta Physico-Chimica Sinica, 2004, 20(11): 1335-1338. DOI: 10.3866/PKU.WHXB20041110 |
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| Authors: | Liu Chang Jian Zhang Yi |
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| Affiliation: | Institute Process Engineering, Chinese Academy of Sciences, Beijing 100080; The Key Laboratory of Catalysis, China National Petroleum Corporation, University of Petroleum, Beijing 102249 |
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| Abstract: | The solubility and phase diagram of Na＋, NH4+// CrO42－, HCO3－-H2O system are determined in this paper. According to the solubility and phase diagram, the solid phases in carbonation process of sodium chromate in ammonia solution are discussed. The results show that a crystalline zone of NaNH4CrO4·2H2O exists, NaHCO3, NaNH4CrO4·2H2O and (NH4)2CrO4 crystallize out in turn during carbonation process as the concentration of sodium chromate in ammonia water exceeds the concentration corresponding to P2(P2′) in phase diagram. Proper concentration is 0.8633～1.1377 g/g H2O for sodium chromate, 0.0611～0.0986 g/g H2O for ammonia, lower than the concentration corresponding to P2(P2′) plot. The NaHCO3 and NaNH4CrO4·2H2O crystals can be separated by hydrocyclone. |
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| Keywords: | Chromates Clean process Solubility Phase diagram |
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