熔融结晶法浓缩稀硫酸

发布时间：2018-03-27 23:42

本文选题：熔融结晶　切入点：稀硫酸　出处：《现代化工》2017年11期

【摘要】：提出了采用熔融结晶法浓缩稀硫酸的新工艺。以初始质量分数为5%的稀硫酸溶液为料液进行熔融结晶实验,在合适的操作条件下成功地将料液浓缩至23%以上,验证了熔融结晶法浓缩稀硫酸的可行性。建立熔融结晶动态过程的数学模型并取得了良好的拟合结果。考察并分析了熔融结晶过程的各操作条件对浓缩过程的影响。结果表明,低过热度、合适的进料速率、较高的降温速率对于提高浓缩效率和晶层生长速率有益。对熔融结晶浓缩过程和工业上常用的蒸发浓缩过程分别进行了耗能量计算,结果表明,在相同的稀硫酸浓缩程度下熔融结晶浓缩过程的耗能量仅占蒸发浓缩过程的60%左右。
[Abstract]:A new process of concentrated dilute sulfuric acid by melting crystallization method was proposed. The solution of dilute sulfuric acid with initial mass fraction of 5% was used for melting crystallization experiment, and the material solution was successfully concentrated to more than 23% under suitable operating conditions. The feasibility of concentrated dilute sulfuric acid by melting crystallization method was verified. The mathematical model of melt crystallization dynamic process was established and good fitting results were obtained. The effects of various operating conditions of melt crystallization process on the concentration process were investigated and analyzed. Low superheat, suitable feed rate and high cooling rate are beneficial to increase the concentration efficiency and growth rate of crystal layer. The energy consumption of melt crystallization concentration process and industrial evaporation concentration process are calculated, respectively. The results show that, At the same concentration of dilute sulfuric acid, the energy consumption of the melting crystallization process is only about 60% of that of the evaporation process.
【作者单位】：天津大学化工学院;太仓中化环保化工有限公司;
【分类号】：TQ111.16

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