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首页> 外文期刊>Crystal growth & design >Real-Time Raman Monitoring of Calcium Phosphate Precipitation in a Semi-Batch Stirred Crystallizer
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Real-Time Raman Monitoring of Calcium Phosphate Precipitation in a Semi-Batch Stirred Crystallizer

机译：半批料搅拌结晶器中磷酸钙沉淀的实时拉曼监测

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摘要

Semi-batch precipitation of calcium monohydrogen phosphate dihydrate (CaHPO_(4)·2H_(2)O; also termed dicalcium phosphate dihydrate, DCPD) from a homogeneous reaction of KH_(2)PO_(4) and CaCl_(2) was studied with inline Raman spectroscopy. In the reaction, hydroxyapatite (HAP, Ca_(5)OH(PO_(4))_(3)) formed first and transferred to DCPD throughout the entire precipitation process. Raman calibration models were created with a series of KH_(2)PO_(4)–NaOH–water solutions. The reliability of the calibration models was validated with offline measurement of phosphate concentration in the mother liquor. Real-time changes in HPO_(4)~(2–) and H_(2)PO_(4)~(–) concentration were monitored and predicted. Comprehensive kinetic information was obtained from liquid and solid analysis. It was found that the influence of the mixing rate on the precipitation was not significant, whereas the reactant feeding rate had a remarkable impact.
机译：磷酸钙二水合物的半批量沉淀（CaHPO_（4）·2H_（2）O;还研究了来自KH_（2）PO_（4）和CaCl_（2）的均相反应的磷酸二水合物，DCPD） 内联拉曼光谱。 在反应中，羟基磷灰石（Hap，Ca_（5）OH（PO_（4））_（3））首先形成并在整个沉淀过程中转移至DCPD。 拉曼校准模型采用一系列KH_（2）PO_（4）-NAOH-水溶液。 校准模型的可靠性验证了母液中磷酸盐浓度的离线测量。 监测和预测HPO_（4）〜（2-）和H_（2）〜（4）〜（ - ）浓度的实时变化。 从液体和固体分析中获得综合动力学信息。 结果发现，混合速率对沉淀的影响并不显着，而反应性饲养速率具有显着的影响。

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  • 来源
    《Crystal growth & design》 |2018年第3期|共7页
  • 作者

    Bing Han; Marjatta Louhi-Kultanen;

  • 作者单位

    School of Engineering Science Lappeenranta University of Technology P.O. Box 20 Lappeenranta FI-53851 Finland;

    School of Engineering Science Lappeenranta University of Technology P.O. Box 20 Lappeenranta FI-53851 Finland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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