晶种制备的在线表征及钛液水解动力学研究

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摘要针对硫酸氧钛水解晶种活性表征困难的问题,首次利用聚焦光束反射测量仪(FBRM)、原位拉曼光谱和动态光散射仪考察了晶种形成过程中溶液组成和粒子的变化,得到了有效的晶种表征手段,并得出爆发成核之前为晶种制备最适宜保温时间;考察了晶种加量和保温时间对水解反应动力学的影响,晶种量的增加会对水解速率和产率起到促进作用;在爆发成核前取样,随着保温时间延长,后期水解速率和产率提高。水解动力学与成核-生长Avrami模型有较好的拟合度。

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	王焜
	路瑞芳
	党乐平
	郝琳
	卫宏远

关键词：水解晶种制备动力学偏钛酸

Abstract： In view of difficulties in seed characterization, Focused Beam Reflectance Measurement(FBRM), ReactRaman and Dynamic Light Scattering were applied for the first time to detect the changes in composition and particle properties of the solution during the preparation of seed, and a proper aging time of the seed crystal with rapid nucleation as the sign of critical time is obtained. Effects of volume and aging time of seed on the kinetics of hydrolysis were investigated. It turns out that hydrolysis rate and conversion are improved when the volume of seed increases or aging time of seed is prolonged before rapid nucleation. The kinetics curve fits well with Avrami nucleation-growth equation.

Keywords： hydrolysis seed preparation dynamics metatitanic acid

Received 2021-03-24;

Fund:国家重点研发计划(2018YFC0808600)。

Corresponding Authors: 郝琳,副教授,E-mail:haolin@tju.edu.cn。 Email: haolin@tju.edu.cn

About author: 王焜(1995-),女,硕士研究生,现从事钛白粉水解方面的研究。

引用本文:

王焜, 路瑞芳, 党乐平, 郝琳, 卫宏远.晶种制备的在线表征及钛液水解动力学研究[J]. 化学工业与工程, 2022,39(4): 50-56

WANG Kun, LU Ruifang, DANG Leping, HAO Lin, WEI Hongyuan.Online characterization of seed preparation and investigation on hydrolysis kinetics of TiOSO₄ solution[J]. Chemcial Industry and Engineering, 2022,39(4): 50-56

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