碳化法重铬酸钠工艺中的CO2-盐-水体系相平衡研究
文献类型：学位论文
| 作者 | 周恩年 |
| 学位类别 | 硕士 |
| 答辩日期 | 2012-05-22 |
| 授予单位 | 中国科学院研究生院 |
| 导师 | 齐涛 ; 曲景奎 |
| 关键词 | 重铬酸钠 二氧化碳 溶解度 热力学模型 相平衡 |
| 其他题名 | Phase Equilibrium Research on CO2–Salt-Water System in the Process of Carbonization for Sodium Chromate |
| 学位专业 | 化学工程 |
| 中文摘要 | 随着清洁生产技术的发展，硫酸法生产重铬酸钠工艺正在逐渐被人们淘汰。碳化法作为一种新型的重铬酸钠清洁生产技术正在受到国内外科研工作者的重视。碳化法具有清洁、高效、综合利用废弃二氧化碳以及碳酸钠循环利用等优点。本文利用热力学的方法对碳化工艺中的工艺问题进行热力学分析，为工业上高效进行碳化及清洁生产提供了可靠地理论依据。本论文主要取得了以下进展： (1) 通过气液相平衡釜测定了在温度为313.1 K~333.1 K，压力为0.1~1.9 MPa下，二氧化碳在重铬酸钠水溶液中的溶解度。 (2) 通过半经验方法及活度系数法对二氧化碳在重铬酸钠溶液中的溶解度进行拟合，拟合实验误差分别为4.24%及3.32%，拟合效果较好。应用半经验模型开展了重铬酸钠浓度对二氧化碳溶解度影响的定量研究，并且通过碳化率模型计算了重铬酸钠对碳化率的影响。 (3) 通过气液相平衡釜测定了在温度为303.1 K~323.1 K，压力为0.1~1.8 MPa下，二氧化碳在铬酸钠溶液中的溶解度。应用OLI软件分析了二氧化碳在铬酸钠溶液中的物理溶解及化学溶解，为二氧化碳在铬酸钠溶液中的溶解行为提供了理论指导。 (4) 通过OLI软件拟合了Na2Cr2O7-NaCr2O4-NaHCO3-H2O四元水盐体系相平衡，研究体系中各组分随温度及组分变化的溶解规律，为碳化后碳化液中碳酸氢钠分离提供了理论指导。 |
| 英文摘要 | With the demand of cleaner production, the process of sulfuric method for sodium chromate is gradually eliminated, and the process route of carbonation of aqueous sodium chromate becomes the trend of the technology. The process of carbonation of aqueous sodium chromate is a clean and efficient route and has the characteristics of comprehensive utilization of waste carbonization and cyclic utilization of hydrogen carbonate. In this thesis, in order to provide a reliable theoretical guidance, a further basic research on the carbonization of sodium chromate was made, by using thermodynamic method to analysis the technical problem encountered in the process. The following achievements and process were exhibited: (1) The solubility of CO2 in aqueous Na2Cr2O7 solutions (0, 0.361, 0.650, 0.901 mol/kg) were measured in the vapor-liquid equilibrium cell, within temperature 313.1~333.1 K, pressure from 0.1 MPa to 1.9 MPa. (2) Two thermodynamic models were applied to calculate the experimental data, that is, modified Setschenow and PR-Pitzer equations. It was proved that the two models fitted well with the experimental data, and the deviations were 4.24% and 3.32% respectively. Additionally the modified Setschenow equation was applied to make a quantitative research on the influence of Na2Cr2O7 concentration on the CO2 absorption and the model of the rate of carbonization was applied to make a quantitative research on the influence of Na2Cr2O7 on the process of carbonization. (3) The solubility of CO2 in aqueous Na2CrO4 solutions (2.022, 3.15, 4.36 mol/kg) were measured in the vapor-liquid equilibrium cell, within temperature 303.1~323.1 K, pressure from 0.1 MPa to 1.8 MPa. The amount of CO2 physical dissolved in solution and that consumed by reaction was fitted by OLI. (4) Four phase equilibrium system of Na2Cr2O7-Na2Cr2O7-NaHCO3-H2O was fitted by OLI, and the components in the system, that vary with temperature and composition, were studied. It provides a guide for sodium bicarbonate separation in the process of carbonization of sodium chromate. |
| 语种 | 中文 |
| 公开日期 | 2013-09-25 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1851]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 周恩年. 碳化法重铬酸钠工艺中的CO2-盐-水体系相平衡研究[D]. 中国科学院研究生院. 2012. |
入库方式： OAI收割
来源：过程工程研究所
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