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Kinetics of thermal decomposition of hydromagnesite
Author(s) -
Rao T. Rajeswara,
Chohan V. S.
Publication year - 1995
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270180511
Subject(s) - decomposition , thermogravimetric analysis , dehydration , thermal decomposition , activation energy , isothermal process , chemistry , chemical decomposition , mass transfer , pyrolysis , dehydration reaction , kinetics , pellets , magnesium , carbonate , nitrogen , chemical engineering , mineralogy , materials science , thermodynamics , organic chemistry , chromatography , biochemistry , physics , quantum mechanics , engineering , composite material
The thermal decomposition of hydromagnesite has been studied using thermogravimetric analysis. The experiments were conducted in a nitrogen atmosphere with pellets of hydromagnesite in the temperature range 300 to 550°C, and also with powder samples under non‐isothermal conditions at a heating rate of 10°C/min. It is found that the reaction proceeds in two stages: dehydration followed by decomposition. The dehydration reaction is controlled by external mass transfer whilst the decomposition reaction is controlled by both external and internal mass transfer. The activation energy for the dehydration reaction was found to be 2.67 × 10 7 J/kmol. From the non‐isothermal analysis the activation energy for the decomposition of magnesium carbonate was found to be 1.62 × 10 8 J/kmol.