Citation:
XIE Feng-Xia, ZHANG Feng-Xing, XUE Ning. Thermal Mass-loss Kinetics of Maleic Anhydride[J]. Chinese Journal of Applied Chemistry,
;2008, 25(3): 340-344.
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The thermal mass-loss of maleic anhydride was studied under non-isothermal conditions by thermogravimetry(TG) technique in N2 atmosphere,and the thermal analysis kinetic equation and kinetic parameters were obtained.Under the experimental conditions,the mass-loss temperature of maleic anhydride was in a range of 110~160℃.The mass-loss rate was found greater than 98%,and the solid mass-loss products were characterized with infrared and thermogravimetry methods.Maleic anhydride gas was found as the final gas product which suggested that the thermal mass-loss of maleic anhydride was a sublimation process.The iterative iso-conversional method was applied to estimate the apparent activation energy Ea when the mass-loss rate was in a range of 0.2~0.9.The apparent activation energy was(75.147±0.48) kJ/mol which agreed with that obtained by Coats-Redfern method.It is concluded that the mass loss of maleic anhydride can be described with a single mechanism function,excluding the possibility of overlapping of multiple-step decomposition reaction.The most probable mechanism function G(α) was determined by master plots method,and G(α)=1-(1-α)m(m=0.813 9±0.02).The pre-exponential factor A of rate equation was obtained on the basis of Ea and G(α),and the pre-exponential factor was ln(A/s-1)=23.57±0.018.
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