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Mechanism and kinetics study of Mg2+ removal from wet-process phosphoric acid by Sinco-430 resin
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2021-03-14 , DOI: 10.1002/cjce.24110 Chao Hu 1 , Xuefang Yan 1 , Runzhou Ye 1 , Yanjun Zhong 1 , Haozhou Liu 1 , Xinlong Wang 1 , Lin Yang 1
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2021-03-14 , DOI: 10.1002/cjce.24110 Chao Hu 1 , Xuefang Yan 1 , Runzhou Ye 1 , Yanjun Zhong 1 , Haozhou Liu 1 , Xinlong Wang 1 , Lin Yang 1
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The reaction mechanism and kinetics of Sinco-430 cation exchange resin removing Mg2+ from wet-process phosphoric acid (WPA) were studied. Fourier transform infrared and X-ray photoelectron spectroscopy analyses revealed that the main functional group of the resin that combined with Mg2+ ions was –SO3H. To investigate the most suitable conditions for Mg2+ removal, the operating parameters that could affect Mg2+ removal were studied. The results demonstrated that under optimal conditions (T = 50°C, solid to liquid mass ratio = 0.3, and P2O5 content = 20 wt.%) the reaction reached equilibrium in 8 min and Mg2+ removal rate reached 59.09%. The kinetic model and activation energy of the reaction were second-order and 19.11 kJ/mol according to kinetic analysis, respectively. The diffusion model of Mg2+ removal was determined as pore diffusion according to the comparison of three different diffusion models. H3PO4 was recovered using deionized water and Mg2+ was removed from the loading resin with 20 wt.% H2SO4. In addition, after eight loading/regeneration cycles, the Mg2+ removal ability of the Sinco-430 resin remained the same. The Mg2+ removal rate in a fixed-bed reactor was 98.83%, higher than that obtained in a continuous stirred-tank reactor.
中文翻译：
Sinco-430树脂去除湿法磷酸中Mg2+的机理及动力学研究
研究了Sinco-430阳离子交换树脂去除湿法磷酸(WPA)中Mg 2+的反应机理和动力学。傅里叶变换红外和 X 射线光电子能谱分析表明，与 Mg 2+离子结合的树脂的主要官能团是–SO 3 H。为了研究最适合去除 Mg 2+的条件，可能影响的操作参数研究了Mg 2+的去除。结果表明，在最佳条件下（T=50℃，固液质量比=0.3，P 2 O 5含量=20 wt.%）反应在8 min内达到平衡，Mg 2+去除率达到59.09%。根据动力学分析，反应的动力学模型和活化能分别为二级和19.11 kJ/mol。根据三种不同扩散模型的比较，确定Mg 2+去除的扩散模型为孔隙扩散。使用去离子水回收H 3 PO 4并且使用20wt.% H 2 SO 4从负载树脂中除去Mg 2+。此外，经过八次加载/再生循环后，Sinco-430 树脂的 Mg 2+去除能力保持不变。镁2+固定床反应器的去除率为98.83%，高于连续搅拌釜反应器。
更新日期：2021-03-14
中文翻译：
Sinco-430树脂去除湿法磷酸中Mg2+的机理及动力学研究
研究了Sinco-430阳离子交换树脂去除湿法磷酸(WPA)中Mg 2+的反应机理和动力学。傅里叶变换红外和 X 射线光电子能谱分析表明，与 Mg 2+离子结合的树脂的主要官能团是–SO 3 H。为了研究最适合去除 Mg 2+的条件，可能影响的操作参数研究了Mg 2+的去除。结果表明，在最佳条件下（T=50℃，固液质量比=0.3，P 2 O 5含量=20 wt.%）反应在8 min内达到平衡，Mg 2+去除率达到59.09%。根据动力学分析，反应的动力学模型和活化能分别为二级和19.11 kJ/mol。根据三种不同扩散模型的比较，确定Mg 2+去除的扩散模型为孔隙扩散。使用去离子水回收H 3 PO 4并且使用20wt.% H 2 SO 4从负载树脂中除去Mg 2+。此外，经过八次加载/再生循环后，Sinco-430 树脂的 Mg 2+去除能力保持不变。镁2+固定床反应器的去除率为98.83%，高于连续搅拌釜反应器。
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