Effects of Solubilizer and Magnetic Field during Crystallization Induction of Ammonium Bicarbonate in New Ammonia-Based Carbon Capture Process
Effects of Solubilizer and Magnetic Field during Crystallization Induction of Ammonium Bicarbonate in New Ammonia-Based Carbon Capture Process
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DOI：
10.3390/en15176231
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发表时间：
2022-08
期刊：
影响因子：
3.2
通讯作者：
Linhan Dong;D. Feng;Yu Zhang-;Heming Dong;Zhiqi Zhao;Jianmin Gao;Feng Zhang;Yijun Zhao;Shaozeng Sun
中科院分区：
文献类型：
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作者：
Linhan Dong;D. Feng;Yu Zhang-;Heming Dong;Zhiqi Zhao;Jianmin Gao;Feng Zhang;Yijun Zhao;Shaozeng Sun
新型氨碳捕集技术作为一种化学吸收方法，可以捕集二氧化碳。在氨中加入乙醇可在一定程度上减少氨的逸出，提高CO2的吸收率。乙醇的溶解结晶可以实现碳酸氢铵的结晶，生成固体产物。结晶过程的诱导受许多参数的影响，如溶液温度、过饱和度和溶剂化沉淀剂含量。基本成核理论与成核的临界尺寸有关。准确测量诱导期和研究相关因素有助于评价成核动力学。研究了增溶剂含量、温度和磁场对碳酸氢铵在乙醇-水二元溶剂混合物中结晶诱导期的影响，并通过固液表面张力和表面熵因子测定了结晶表面的生长机理。结果表明，在相同的混合溶液温度条件下，随着组分中溶剂化沉淀剂含量的增加，结晶诱导期明显延长，固液表面张力增大，成核屏障更加明显，不易成核。在增溶剂含量相同的情况下，溶液温度与诱导期成反比关系，固液表面张力减小。磁场能显著缩短溶剂化物结晶过程的诱导周期。这个间隙随着过饱和度的增加而减小；缩短率从96.9%降低到84.0%。随着溶液中溶剂含量的增加，这种下降趋势越来越明显。在本实验条件下，表面熵因子的变化范围为0.752 ~ 1.499。用表面熵因子判断碳酸氢铵在乙醇-水二元溶剂混合物中的生长方式为连续生长。
As a chemical absorption method, the new ammonia carbon capture technology can capture CO2. Adding ethanol to ammonia can reduce the escape of ammonia to a certain extent and increase the absorption rate of CO2. The dissolution and crystallization of ethanol can realize the crystallization of ammonium bicarbonate and generate solid products. The induction of the crystallization process is influenced by many parameters, such as solution temperature, supersaturation, and solvating precipitant content. The basic nucleation theory is related to the critical size of nucleation. Accurate measurement of the induction period and investigating relevant factors can help to assess the nucleation kinetics. The effects of solubilizer content, temperature, and magnetic field on the induction period of the crystallization process of ammonium bicarbonate in the ethanol–H2O binary solvent mixture and determining the growth mechanism of the crystal surface by solid–liquid surface tension and surface entropy factor are investigated. The results indicate that under the same conditions of mixed solution temperature, the crystallization induction period becomes significantly longer, the solid–liquid surface tension increases, and the nucleation barrier becomes more significant and less likely to form nuclei as the content of solvating precipitants in the components increases. At the same solubilizer content, there is an inverse relationship between the solution temperature and the induction period, and the solid–liquid surface tension decreases. The magnetic field can significantly reduce the induction period of the solvate crystallization process. This gap tends to decrease with an increase in supersaturation; the shortening reduces from 96.9% to 84.0%. This decreasing trend becomes more and more evident with the rise of solvent content in the solution. The variation of surface entropy factor under the present experimental conditions ranges from 0.752 to 1.499. The growth mode of ammonium bicarbonate in the ethanol–H2O binary solvent mixture can be judged by the surface entropy factor as continuous growth.