The solubility of NaHCO₃ was determined in the NH₄⁺–Na⁺–CO₃^2––HCO₃^––Cl^––H₂O system with the concentration up to 6 mol·kg^–1 by a dynamic method from 283.15 to 333.15 K. It was found that the solubility of NaHCO₃ decreases with increasing concentration of Na₂CO₃, NH₄HCO₃, or NaCl. A speciation-based model was developed with mixed-solvent electrolyte interaction parameters newly obtained by regressing both the experimental and literature solubility data. The average relative deviations are less than 5.0%. The new model is able to predict the solubility of NaHCO₃ at high pressures up to 6.0 MPa for the NH₃–CO₂–NaCl–H₂O system at 313.15 and 323.15 K. This work can provide a theoretical basis for producing Na₂CO₃ with a better crystal form and higher productivity in the carbonation process.

中文翻译：

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NaHCO ₃和NH ₄ HCO ₃在相关介质中的溶解度以及NH ₃ -CO ₂ -NaCl-H ₂ O系统高压相平衡的预测

碳酸氢钠的溶解度₃是在NH确定₄ ⁺ -Na ⁺ -CO ₃ ^2- -HCO ₃ ^- -Cl ^- -H ₂ O，其浓度可达系统6摩尔公斤· ^-1通过动态方法从283.15到333.15K。发现NaHCO ₃的溶解度随Na ₂ CO ₃，NH ₄ HCO ₃浓度的增加而降低或NaCl。通过回归实验和文献溶解度数据，开发了一种基于形态的模型，该模型具有新获得的混合溶剂电解质相互作用参数。平均相对偏差小于5.0％。对于在313.15和323.15 K下的NH ₃ –CO ₂ –NaCl–H ₂ O系统，新模型能够预测在高达6.0 MPa的高压下NaHCO ₃的溶解度。这项工作可以为生产Na ₂提供理论依据。在碳化过程中，具有更好的晶体形式和更高的生产率的CO ₃。