Abstract—

Phase equilibria in the quaternary reciprocal water–salt systems K⁺, Na⁺||\({\text{HCO}}_{{\text{3}}}^{-},\)HCOO^––H₂O and K⁺, Na⁺||\({\text{CO}}_{{\text{3}}}^{{{\text{2}}-}},\) HCOO^––H₂O at 25°C were studied for the first time. A theoretical calculation determined that the stable pair of salts in the systems are sodium formate and sodium carbonate or bicarbonate. Analysis of the obtained phase diagrams showed that the crystallization fields of sodium carbonate or bicarbonate are maximum, and the crystallization field of sodium formate is minimum. Theoretical justification was given to the process of producing saturated solutions of potassium formate from sodium formate and potassium carbonate or bicarbonate.

中文翻译：

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K +，Na + || H $$ {\ text {CO}} _ {{\ text {3}}} ^ {-}，$$ HCOO – –H 2 O和K +，Na +的相平衡|| $$ {\ text {CO}} _ {{\ text {3}}} ^ {{{\ text {2}}-}}，$$ HCOO – –H 2 O系统在25°C

摘要—

四元倒数水盐系统K ⁺，Na ⁺ ||的相平衡 \（{\ text {HCO}} _ {{\ text {3}}} ^ {-}，\） HCOO ^– –H ₂ O和K ⁺，Na ⁺ || \（{\ text {CO}} _ {{\ text {3}}} ^ {{{{\ text {2}}-}}，\） HCOO ^– –H ₂首次研究了25°C下的O。理论计算确定，系统中稳定的盐对为甲酸钠和碳酸钠或碳酸氢钠。对所得相图的分析表明，碳酸钠或碳酸氢钠的结晶场最大，而甲酸钠的结晶场最小。从甲酸钠和碳酸钾或碳酸氢盐生产甲酸钾的饱和溶液的过程提供了理论依据。