Mechanism of Influence of Organic Impurity on Crystallization of Sodium Sulfate,Industrial & Engineering Chemistry Research

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Mechanism of Influence of Organic Impurity on Crystallization of Sodium Sulfate
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-01-29 00:00:00 , DOI: 10.1021/acs.iecr.7b04625
Nannan Su ₁ , Yongli Wang _{1,

2} , Yan Xiao ₁ , Haijiao Lu ₁ , Yajing Lou ₁ , Jingjing Huang ₁ , Meng He ₁ , Yang Li ₁ , Hongxun Hao _{1,

2}

Affiliation

To promote the development of crystallization technology for recovering salt from high salinity wastewater, the effect of organic impurity on crystallization of sodium sulfate was investigated by using phenol as a representative organic impurity. The effect of phenol on crystallization thermodynamics of sodium sulfate was evaluated by measuring solubility data of sodium sulfate in water in the presence of phenol. It was found that the existence of phenol could suppress the solubility of sodium sulfate in water. The effect of organic impurity on crystal nucleation was performed by measuring the metastable zone width (MSZW) and induction time of sodium sulfate. Two models (self-consistent Nývlt-like equation and Classical 3D nucleation theory) were used to analyze the experimental data. It was found that Classical 3D nucleation theory (3D CNT) can better explain the effect of phenol on nucleation. From both MSZW data and induction time data, it was found that the existence of phenol will apparently increase the interfacial energy γ, which will result in higher nucleation Gibbs energy barrier and thus lower nucleation rate. Furthermore, the existence of phenol will increase the critical nucleus radius r* and the critical Gibbs energy ΔG*, which means that the formation of the nuclei will be more difficult in the presence of phenol. According to the above analysis, the possible mechanism of influence of organic impurity on crystallization of sodium sulfate was proposed.

中文翻译：

有机杂质对硫酸钠结晶的影响机理

为了促进从高盐度废水中回收盐的结晶技术的发展，以苯酚为代表的有机杂质研究了有机杂质对硫酸钠结晶的影响。通过测量在苯酚存在下硫酸钠在水中的溶解度数据，评估苯酚对硫酸钠结晶热力学的影响。发现苯酚的存在可以抑制硫酸钠在水中的溶解度。通过测量亚稳区宽度（MSZW）和硫酸钠的诱导时间来进行有机杂质对晶体成核的影响。使用两个模型（自洽的Nývlt方程和经典的3D成核理论）来分析实验数据。发现经典3D成核理论（3D CNT）可以更好地解释酚对成核的影响。从MSZW数据和诱导时间数据都发现，苯酚的存在显然会增加界面能γ，这将导致更高的成核Gibbs能垒，从而降低成核速率。此外，苯酚的存在会增加临界核半径r *和临界吉布斯能量ΔG *，这意味着在苯酚存在下，核的形成将更加困难。根据以上分析，提出了有机杂质影响硫酸钠结晶的可能机理。

更新日期：2018-01-29

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