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亚硫酸钙两步法制备高浓度亚硫酸氢钠溶液

Preparation of high concentration NaHSO3 solution by two-step method of desulfurization intermediate CaSO3

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【作者】 李文俊王金玉李洪玲洪成林但建明乔秀文

【Author】 Li Wenjun;Wang Jinyu;Li Hongling;Hong Chenglin;Dan Jianming;Qiao Xiuwen;Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan and School of Chemistry and Chemical Engineering,Shihezi University;

【通讯作者】 乔秀文;

【机构】 石河子大学化学化工学院/新疆兵团化工绿色过程重点实验室/省部共建国家重点实验室培育基地

【摘要】 利用湿法烟气脱硫中间产物亚硫酸钙(CaSO3)和氯碱工业副产物芒硝和废硫酸制备高浓度亚硫酸氢钠(NaHSO3)溶液,以简化亚硫酸氢钠溶液的后续处理工序并降低能耗。以亚硫酸氢钠溶液质量浓度为考察指标,采用两步法制备高浓度的亚硫酸氢钠。首先考察亚硫酸钙加入量、反应温度、反应时间、亚硫酸钙悬浮液质量分数等因素对第一步制备的低浓度亚硫酸氢钠溶液质量浓度的影响。其次考察第一步制备的低浓度亚硫酸氢钠溶液质量浓度对第二步制备的高浓度亚硫酸氢钠溶液质量浓度的影响。研究结果表明,实验中当亚硫酸钙加入量为0.068 mol、反应温度为13℃、反应时间为30 min、亚硫酸钙悬浮液质量分数为25%时,第一步制备的低浓度亚硫酸氢钠溶液质量浓度达到198.2 g/L;当第一步制备的低浓度亚硫酸氢钠溶液质量浓度为170 g/L时,第二步制备的高浓度亚硫酸氢钠溶液质量浓度达到264.2 g/L。采用两步法制备高浓度的亚硫酸氢钠溶液,节省了蒸发能源,具有显著的经济效益,为亚硫酸钙的利用提供了一条可行的路径。

【Abstract】 The high-concentration NaHSO3 solution was prepared by using wet flue gas desulfurization intermediate product CaSO3 ,chlor-alkali industrial by-products Na2SO4and waste sulfuric acid via two-step method.This method can simplify the subsequent treatment process and reduce energy consumption of the traditional preparation process of NaHSO3 solution.The concentration of NaHSO3 was selected as a major indicator to guide experiments to prepare a high concentration NaHSO3 solution by two-step method.Firstly,the effects of CaSO3 amount,reaction temperature,reaction time and mass fraction of CaSO3 suspension on the concentration of dilute NaHSO3 were investigated.Secondly,the effect of dilute NaHSO3 concentration on the high concentration NaHSO3 solution was investigated.The results showed that when the amount of CaSO3 was 0.068 mol,the reaction temperature was 13℃,reaction time was 30 min and the mass fraction of CaSO3 solution was 25%in the experiment,the diluted NaHSO3 solution with 198.2 g/L can be prepared.When the mass concentration of diluted NaHSO3 solution was 170 g/L,the mass concentration of high concentration NaHSO3 solution can reached 270.4 g/L,which was close to saturation.This two-step method for preparation of high concentrated NaHSO3 solution not only saves energy,but also provides a feasible path for the utilization of CaSO3 ,which can brings a significant financial benefit.

【基金】 石河子大学高层次人才启动项目(RSCX2018B06);石河子大学成果转化与技术推广项目(CGZH201707)
  • 【文献出处】 无机盐工业 ,Inorganic Chemicals Industry , 编辑部邮箱 ,2020年03期
  • 【分类号】TQ131.12
  • 【下载频次】142
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