Study on Pressure Effect on Thermal Decomposition Reaction of Ethylene Oxide Aqueous Solutions
To investigate the effect of pressure on the pyrolysis reaction of ethylene oxide(EO)aqueous solution,an accelerated calorimeter(ARC)was used to conduct adiabatic decomposition tests on EO aque-ous solutions with mass fractions of 20%and 50%at different initial pressures.The initial decomposition temperature(T0,s),adiabatic temperature rise(ΔTad,s),maximum temperature rise rate(mm,s),and maximum temperature rise rate arrival time(θm,s)of the samples under adiabatic conditions were obtained,and the experimental data were corrected using the thermal inertia factor ϕ.The research re-sults indicated that under adiabatic conditions,there were significant differences in the effect of pressure on the pyrolysis characteristics of EO aqueous solu-tions with different concentrations.The increase in initial pressure had an inhibitory effect on the pyroly-sis reaction of EO aqueous solution with a mass frac-tion of 20%.The temperature rise ΔTad during the heat release process of the solution decreased,the termination temperature Tf of heat release decreased,and the maximum heat release rate mm and unit mass reaction heat ΔHs both showed a decreasing trend.On the contrary,the increase in initial pressure had a promoting effect on the pyrolysis reaction of EO aque-ous solution with a mass fraction of 50%.During the uncontrolled exothermic process,ΔTad increased,Tf increased,and both mm and ΔHs showed an increas-ing trend.The study found that it can provide refer-ence for emergency response measures for high con-centration EO aqueous solutions.
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