Phase Diagram for the Na2SO4–(NH4)2SO4–MEA–H2O System at Elevated Temperature,Journal of Chemical & Engineering Data

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Phase Diagram for the Na2SO4–(NH4)2SO4–MEA–H2O System at Elevated Temperature
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2021-07-01 , DOI: 10.1021/acs.jced.1c00133
Binghui Li _{1,

2} , Xiaojuan Zhang _{2,

3} , Zhibao Li ₃

Affiliation

It is essential to develop a new antisolvent technology for soda ash manufacture by the use of sodium sulfate as raw material due to intensive energy consumption for the separation of sodium sulfate from ammonia sulfate-bearing liquor by filtering sodium bicarbonate. Phase diagram data for the Na₂SO₄–(NH₄)₂SO₄–monoethanolamine (MEA)–H₂O system was determined and modeled to regress the paired-ion interactions included in the mixed-solvent electrolyte model with good accuracy. It was found that the solubility of Na₂SO₄ in MEA solution sharply decreases with the concentration of MEA, while the addition of MEA as the solvent largely enhances the solubility of (NH₄)₂SO₄ in solution. These findings show that sodium sulfate may be efficiently separated from ammonia sulfate solution with the help of MEA antisolvent technology.

中文翻译：

高温下 Na2SO4–(NH4)2SO4–MEA–H2O 系统的相图

由于通过过滤碳酸氢钠从含硫酸铵的液体中分离硫酸钠需要消耗大量能源，因此必须开发一种新的以硫酸钠为原料生产纯碱的反溶剂技术。Na ₂ SO ₄ -(NH ₄ ) ₂ SO _{4 -}单乙醇胺(MEA)-H ₂ O 系统的相图数据被确定和建模，以高精度地回归混合溶剂电解质模型中包含的成对离子相互作用。发现 Na ₂ SO ₄的溶解度MEA溶液中的溶解度随着MEA浓度的增加而急剧下降，而MEA作为溶剂的加入大大提高了(NH ₄ ) ₂ SO ₄在溶液中的溶解度。这些发现表明，在 MEA 反溶剂技术的帮助下，硫酸钠可以有效地从硫酸铵溶液中分离出来。

更新日期：2021-08-12

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