In order to study thermal hazard in polymerization reaction in polystyrene synthesis process,reaction calorimeter(RC1mx)is utilized to study thermal effect of polymerization reaction process,adiabatic accelerated calorimeter(ARC)is employed to test the adiabatic decomposition characteristics of the mixture materials before and after polymerization reaction and to carry out kinetic study.RC1mx test results show that total exothermic heat released from the polymerization reaction is 82.612 kJ,adiabatic temperature lift △Tad is 152.6℃,the highest synthetic reaction temperature is 252.6℃,and the highest technical temperature is 146℃.ARC experiments show that the adiabatic process of polymerization reaction mixture materials is divided into two phases.The first phase releases exothermic heat in the range of 62-118℃,with an adiabatic temperature rise of 56℃.The second phase release exothermic heat in the range of 118-145℃,with an adiabatic temperature rise of 27℃.According to kinetic analysis on the adiabatic decomposition in stage 1 of ARC experiment,the apparent activation energy obtained is 120.55 kJ·mol-1,and the finger-forward factor A is 36.5 min-1,which is used to find the time of maximum reaction rate of the runaway reaction.Based on the results from RC1mx and ARC experiments,thermal hazard in polystyrene polymerization reaction is evaluated.
safety engineeringpolystyrenethermal runawayreaction calorimetryadiabatic temperature riseadiabatic accelerated calorimetryreaction kinetics
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