结晶
磷酸
过饱和度
杂质
成核
Crystal(编程语言)
醋酸
悬挂(拓扑)
材料科学
化学工程
母液
化学
结晶学
冶金
有机化学
同伦
程序设计语言
纯数学
工程类
计算机科学
数学
作者
Ippei Tsushima,Kouji Maeda,Takuji Yamamoto,Koji Arafune,Hajime Miki
标识
DOI:10.1002/crat.202100102
摘要
Abstract In this study, batch crystallization via indirect cooling and continuous crystallization via direct and indirect cooling of phosphoric acid hemihydrate (H 3 PO 4 .1/2H 2 O) from the mixed acid solution of phosphoric acid and acetic acid are performed. In batch crystallization, needle‐shaped crystals are obtained, and the impurity concentration of acetic acid in the crystals is 4.2 wt%. Primary nucleation occurred under a high degree of supersaturation, and the metastable zone width for secondary nuclei is narrow. In contrast, in continuous crystallization via indirect cooling, scaly crystals are obtained, and the acetic acid impurity concentration therein is 2.0 wt%. Additionally, continuous crystallization via direct contact cooling is performed, the crystal shape and impurity concentration under direct cooling are similar to those under indirect cooling, suggesting the possibility to downsize the apparatus. Through utilization of the equipment and approach elaborated herein, the correlation between the operating conditions and crystal quality can be assessed.
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