Solubility and Modeling for NaHCO3 and NH4HCO3 Crystals in the System Na+-NH4+-SO42--Cl--H2O from 283.15 to 323.15 K
Solubility and Modeling for NaHCO3 and NH4HCO3 Crystals in the System Na+-NH4+-SO42--Cl--H2O from 283.15 to 323.15 K
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NaHCO3 和 NH4HCO3 晶体在 Na -NH4 -SO42--Cl--H2O 系统（283.15 至 323.15 K）中的溶解度和建模
DOI：
10.1021/acs.jced.9b00901
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发表时间：
2020
影响因子：
--
通讯作者：
Li Zhibao
中科院分区：
文献类型：
--
作者：
Zhang Xiaojuan;Li Zhibao
Sulfate salts, generally contained in the feed materials for soda ash production, may have an important influence on the NaHCO3precipitation in the carbonation tower of the Solvay process and the Trona process. The solubilities of NaHCO3and NH4HCO3solids were determined in Na2SO4, (NH4)2SO4, and NaCl solutions as well as their mixtures via a dynamic method from 283.15 to 323.15 K. It was found that NaHCO3become less soluble with the addition of Na2SO4, whereas more NH4HCO3is dissolved. The solubility of NaHCO3increases with the increasing concentration of (NH4)2SO4, while that of NH4HCO3decreases. The mixed-solvent electrolyte (MSE) model was modified by experimental data regression through the adjustment of the middle-range interaction parameters. The average relative deviation between the calculated results and experimental data is less than 5%. This work provides a basis for improving both the efficiency of the carbonation tower and the quality of end products.
