碳酸氢钠冷却结晶动力学
Cooling Crystallization Kinetics of Sodium Bicarbonate
投稿时间:2019-11-26  
DOI:10.12119/j.yhyj.202102006
中文关键词:  碳酸氢钠  冷却结晶  停留时间  MSMPP结晶器  结晶动力学
英文关键词:Sodium bicarbonate  Cooling crystallization  Residence time  MSMPR crystallizer  Crystallization kinetics
基金项目:企业资助项目
作者单位
蒋士姣 浙江汇力胶囊有限公司,浙江 绍兴 312000 
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中文摘要:
      碳酸氢钠(NaHCO3)俗称小苏打,其产品质量取决于颗粒的大小,晶体的形貌和样品的纯度等诸多因素。本论文基于连续稳态MSMPR结晶器原理,研究了不同停留时间下,碳酸氢钠从碳酸钠溶液中冷却结晶过程动力学。利用实验数据建立了NaHCO3的结晶动力学操作模型。实验和计算结果表明,随停留时间的增加,NaHCO3过饱和度降低,晶体生长速率和成核速率均减小,相应的平均粒径增加,细颗粒含量减小;适当延长停留时间是制取高品质小苏打产品的有效途径。冷却结晶过程可有效增加小苏打产量,小苏打收率维持在55%左右。此外,一定Na2CO3存在下冷却结晶碳酸氢钠晶体形态由细长的针状变为规整的片状。
英文摘要:
      Sodium bicarbonate(NaHCO3)commonly known as baking soda,its product quality depends on the particle size,crystal shape and sample purity,etc.Cooling crystallization kinetics of sodium bicarbonate in the sodium carbonate solutions was experimentally investigated with the steady continuous MSMPR crystallizer.A kinetic operation model was finally built based on the experimental data.The experimental and calculation results showed that the crystal growth and nucleation rates decrease as the residence time increases.These results may be explained by the expected decrease in supersaturation as the residence time increases.Subsequently,larger crystals with lesser amounts of fines were generated.It is apparent that increased residence times are effective in obtaining high-quality NaHCO3 crystals.Cooling crystallization process can effectively increase the output of sodium bicarbonate and yield of sodium bicarbonate is around 55%.Furthermore,in the presence of a certain amount of sodium carbonate,the crystals which are thin elongated needles turned into compact and thicker flakiness.
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