文献类型：期刊文献

英文题名：The thermal decomposition study of MgCl2?6H2O?1,4-C4H8O2

作者：Jin, Miaomiao[1,2];Sun, Yuzhu[1];Li, Ping[1];Yu, Jianguo[1];Ulrich, Joachim[2]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Halle Wittenberg, Zentrum Ingenieurwissensch, Verfahrenstech TVT, D-06099 Halle, Germany

年份：2015

卷号：104

起止页码：256

外文期刊名：CHEMICAL ENGINEERING RESEARCH & DESIGN

收录：;EI(收录号：20160501864817);WOS:【SCI-EXPANDED(收录号:WOS:000367629900023)】；

基金：This work was financially supported by the National High Technology Research and Development Program of China (863 Program, Grant no. 2012AA061601) and Doctoral Fund of Chinese Ministry of Education (Grant no. 20120074120013). One of the authors is grateful to Martin Luther University Halle-Wittenberg to host her and for the experimental support. She would also like to acknowledge the financial support from the China Scholarship Council.

语种：英文

外文关键词：MgCl2 center dot 6H(2)O center dot 1,4-C4H8O2; Decomposition; Thermogravimetric-mass spectrometry 1,4-C4H8O2

摘要：The thermal decomposition mechanism and process of MgCl2 center dot 6H(2)O center dot 1,4-C4H8O2 were studied using thermogravimetric-mass spectrometry analysis for non-isothermal decomposition, and mechanical convection drying for isothermal decomposition. The pyrolysis products were analysed using chemical analysis, GC measurement, and X-ray powder diffraction. The results showed that there were four stages in the non-isothermal decomposition of MgCl2 center dot 6H(2)O center dot 1,4-C4H8O2 from 25 degrees C to 250 degrees C. The first stage should be the decomposition of 1,4-C4H8O2 in the MgCl2 center dot 6H(2)O center dot 1,4-C4H8O2 adduct, the second and third stages turned out to be the elimination of crystal water, while the fourth stage included the elimination of water and HCl. The kinetic analysis of the thermal decomposition process was performed using the Coats-Redfern method and the Malek method. Results showed that the first two stages obeyed the 2-dimensional phase boundary mechanism (model R2) and the 3-dimensional phase boundary mechanism (model R3), respectively, while the last two ones followed the nucleation and nuclei growth (A1) kinetics. The isothermal decomposition process for 48h from 60 degrees C up to 140 degrees C could be divided into three groups: Below 60 degrees C, there was no decomposition of MgCl2 center dot 6H(2)O center dot 1,4-C4H8O2; for the temperature range from 70 degrees C up to 100 degrees C, the main decomposition product was MgCl2 center dot 4H(2)O; while for the temperature range of 110 degrees C to 140 degrees C, the main products were a mixture of MgCl2 center dot 4H(2)O and MgCl2 center dot 2H(2)O. The temperature of 100 degrees C was chosen for further industrial MgCl2 center dot 6H(2)O center dot 4-C4H8O2 decomposition study due to low energy consumption and tiny amount of by-products. This study provides a valuable theoretical basis for industrializing the MgCl2 center dot 6H(2)O center dot 1,4-C4H8O2 decomposition process. (C) 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.