高校化学工程学报2017，Vol.31Issue(3)：521-529,9.DOI:10.3969/j.issn.1003-9015.2017.03.004
系列变温条件下K2SO4·MgSO4·6H2O与KCl转化结晶K2SO4动力学与机理
Kinetics and Mechanism of K2SO4 Transforming Crystallization from K2SO4·MgSO4·6H2O and KCl Reaction under Different Temperatures
摘要
Abstract
Transforming crystallization of K2SO4 from picromerite (Pic) and KCl reaction under temperatures of 25, 40 and 55℃ was studied. Liquid and solid phases at different stages were chemically characterized. The results show that KCl dissolves faster than Pic under these temperatures with rapid K2SO4 crystallization. The dissolution rate of Pic increases with the increase of temperature, while the dissolution rate of KCl is not affected. Moreover, the crystallization rate of K2SO4 increases but its yield decreases with the increase of temperature. The profiles of K2SO4 yield and Pic/KCl dissolution amounts as a function of time are nonlinearly fitted under these temperatures, respectively. Equations of dissolution and crystallization kinetics are obtained with dynamic model simulation, and reaction rate constants and reaction orders are calculated. Arrhenius formula is used to calculate activation energies of dissolution and crystallization, and dissolution and crystallization mechanism are proposed.关键词
软钾镁矾/硫酸钾/动力学/相图Key words
picromerite/K2SO4/kinetics/phase diagram分类
化学化工引用本文复制引用
胡天琦,张志宏,董欧阳,马艳芳,赵冬梅,张永明,王健康..系列变温条件下K2SO4·MgSO4·6H2O与KCl转化结晶K2SO4动力学与机理[J].高校化学工程学报,2017,31(3):521-529,9.基金项目
高新技术研究与发展计划(2012-G-212A) （2012-G-212A）
青海省科技支撑项目(2013-G-139A). （2013-G-139A）
