Phase equilibria in systems K+, NH4+//Cl-, SO42--H2O and K+, NH4+//Cl-, SO42--H2O at 313.15 K

REN Yongsheng; HE Tingting; XIE Juan; CAI Chao

doi:10.11949/j.issn.0438-1157.20171315

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Phase equilibria in systems K⁺, NH₄⁺//Cl^-, SO₄^2--H₂O and K⁺, NH₄⁺//Cl^-, SO₄^2--H₂O at 313.15 K

更新时间：2025-12-10

- Phase equilibria in systems K⁺, NH₄⁺//Cl^-, SO₄^2--H₂O and K⁺, NH₄⁺//Cl^-, SO₄^2--H₂O at 313.15 K
- CIESC Journal Issue 7, Pages: 2838-2850(2018)
- 作者机构：
  
  1. 省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏,银川,750021
  2. 宁夏大学化学化工学院,宁夏,银川,750021
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171315
  CLC： 642
- Online First：05 July 2018，
  
  Published：05 July 2018
- 稿件说明：
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REN Yongsheng, HE Tingting, XIE Juan, et al. Phase equilibria in systems K⁺, NH₄⁺//Cl^-, SO₄^2--H₂O and K⁺, NH₄⁺//Cl^-, SO₄^2--H₂O at 313.15 K[J]. CIESC Journal, 2018, (7): 2838-2850. DOI: 10.11949/j.issn.0438-1157.20171315.
DOI：

REN Yongsheng, HE Tingting, XIE Juan, et al. Phase equilibria in systems K⁺, NH₄⁺//Cl^-, SO₄^2--H₂O and K⁺, NH₄⁺//Cl^-, SO₄^2--H₂O at 313.15 K[J]. CIESC Journal, 2018, (7): 2838-2850. DOI: 10.11949/j.issn.0438-1157.20171315. DOI：

摘要

采用等温溶解法研究333.15 K体系（K+，NH4+//Cl-，SO42--H2O）和（K+，NH4+//Cl-，SO42--（CH2OH）2-H2O）[w（（CH2OH）2）=30%]的固液相平衡关系。测定了平衡溶液的溶解度数据及物化性质，包括密度、黏度、折射率、pH。根据实验数据，绘制了相应的干盐相图、水图及物化性质-组成图。实验中的物化性质（黏度、密度、折射率、pH）随J（2NH4+）的变化呈现相似性规律。实验结果表明：在333.15 K下，体系（K+，NH4+//Cl-，SO42--H2O）和（K+，NH4+//Cl-，SO42--（CH2OH）2-H2O）[w（（CH2OH）2）=30%]的相图相似，均含有一个四元共饱和点，四条单变曲线及四个固相结晶区域。这两个体系均为复杂体系，存在（K，NH4）Cl、（NH4，K）Cl、（K，NH4）2SO4、（NH4，K）2SO4四种固溶体。实验所获数据和结论，可优化以硫酸盐型固体废弃物为硫酸根来源，转化法生产硫酸钾工艺。

Abstract

An experimental study on phase equilibria in the system (K+

NH4+//Cl-

SO42--H2O) and (K+

NH4+//Cl-

SO42--(CH2OH)2-H2O) is done by the method of isothermal solution saturation. In these systems

the initial mass fraction of ethylene glycol is 30% in the salt-free binary solvent water + ethylene glycol. The solubilities

densities

viscosities

and refractive indices of saturated solutions have been measured for the two systems. On the basis of the experimental data

corresponding phase diagrams and diagrams of physical properties versus composition were plotted. All the physical properties of both systems change regularly with concentration change of the liquid phase. The phase diagram of (K+

NH4+//Cl-

SO42--H2O) consists of one invariant point

four univariant curves

and four solid phase crystallization regions at 333.15 K. The phase diagram of (K+

NH4+//Cl-

SO42--(CH2OH)2-H2O) is similar to the previous one

which contains one invariant point

four univariant curves

and four solid phase crystallization regions at 333.15 K. Comparisons of the stable phase diagrams for (K+

NH4+//Cl-

SO42--H2O) and (K+

NH4+//Cl-

SO42--(CH2OH)2-H2O) at 333.15 K are shown that they all have four solid solutions[respectively (K

NH4)Cl

(NH4

K)Cl

NH4)2SO4 and (NH4

K)2SO4)]. These changes between phase diagrams at different solvents will be very useful for extracting the salts. According to this work

the measured data and phase equilibrium diagrams can be used for a new technology to design and optimize the production of K2SO4

from mother liquor of calcium carbonate whiskers prepared by FGD gypsum. At the same time

it can provide fundamental data support for chemical industry development.

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