文档介绍：碱式碳酸镁纳米花的热分析干燥动力学研究
何昌斌王宝和
(大连理工大学化工学院,辽宁大连116012)
摘要:以六水氯化镁和尿素为原料,采用均匀沉淀法制备出碱式碳酸镁纳米花。在不同干燥介质温度和不同物料床层厚度下,得到碱式碳酸镁纳米花的干燥曲线和干燥速率曲线。采用热分析动力学技术对干燥动力学实验数据进行处理后,得到碱式碳酸镁纳米花的干燥微分机理函数为,干燥积分机理函数为,干燥方程为,干燥速率方程为,干燥速率常数为;指前因子=-1,界面蒸发活化能=,经验常数=-1。
关键词:热分析;干燥动力学;碱式碳酸镁;纳米花;
中图分类号: 文献标志码: 文章编号:
Thermal Analysis Modelling of Drying ics of Basic Magnesium Carbonate Nanoflowers
HE Chang-bin,WANG Bao-he
(School of Chemical Engineering, Dalian University of Technology, Dalian 116012, China)
Abstract:Basic magnesium carbonate nanoflowers were synthesized by a homogenous precipitation reaction,using MgCl2·6H2O and CO(NH2)2 as raw materials. Drying ics experiments of basic magnesium carbonate nanoflowers were made, and the drying curves as well as drying rate curves were obtained at different drying medium temperatures and different wet material bed-layer thicknesses , respectively. The experimental data of drying ics were simulated by means of thermal analysis ics method, and the drying differential mechanism function, the drying integral mechanism function, the drying equation, the drying rate equationas well as the drying rate constant were obtained. The pre-exponential factor is -1, the activation energy of interface evaporation is , and the experimental constantis -1.
Keywords:thermal analysis;drying ics;basic magnesium c