Regarding the asphaltenes, the extensively existed and least studied fraction in oil reservoirs, this work is aimed to discuss the geochemical problems related with asphaltenes, by studying their pyrolysis kinetics, mild chemical degradation and FT-IR analysis.
It can be concluded that PCB is not favorable for energy application directed at gas production. Friedman method was utilized to analyze the pyrolysis kinetics of PCB.The kinetic parameters obtained were: apparent activation energy 190.92 kJ/mol,reaction order 5.97,pre-exponential factor lnA 47.14 min~(-1).
应用Friedm an方法对PCB的热解动力学进行了研究,求得PCB的热解动力学参数分别是:表观活化能190.92 kJ/mol,反应级数5.97,指前因子lnA47.14 m in-1。
The weight loss of pure macerals can be calculated from the weight loss curves of maceral concentrates by solving the simultanous linear equetions. Consequently, the pyrolytic kinetics f four macerals was explored. The activation energy of pyrolysis has been obtained as follows:151 kJ/mol for vitrinite, 121 kJ/mol for semi-vitrinite, 116 kJ/mol for fusinite and 141 kJ/mol for exinite.
The factors which affect pyrolytic process and parametres of pyrolytic kinetics such as apparent activation energy,order of reaction and pre-exponential factors are obtained with thermogravimetric instrument through investigating the pyrolysis for biomass corn cob under different conditions.
Using Freeman-Carroll and Liu-Fan pyrolysis kinetic equations, more reasonable apparent kinetic parameters of typical polymers at heating rates of 10 K·min -1 and 75 K·min -1 in nitrogen atmosphere have been evaluated respectively.
Study on biomass pyrolysis kinetics which can obtain pyrolysis kinetic parameters is of great important significance toward judging pyrolysis mechanism and influence factors and optimizing reaction conditions.
The thermal decomposition kinetics equation of aspirin can be expressed as: d α /d t =1.15×10 8e -96.04/ RT (1-( α ) 1.91 . Conclusion: stability of the tablets is bigger than that of materials. Being sensitive to temperature, it is suggested that aspirin should be stored in low temperature properly. The shelf life that aspirin decomposes 10 % at room temperature is estimated 2.08 a.
Activation energy deduced by extrapolation under heating rate of 0℃·min -1 was 188 04 kJ·mol -1 . Thermal decomposition kinetics function expression was dα/dt=Ae -EaRT (1-α) 2 and the mathematic expression of the kinetic compensation effect is found to be ln=0 2264Ea-5 4458. CONCLUSION Ribavirin has high thermal stability because of its high thermal decomposition activation energy.
This article use the Thermobalance technology and the differential thermal analysis technology, mensurate 20 kinds of forest fuel in Maoer Mountain, in order to achieve thermal decomposition kinetics parameter E from the TG-DTA curve as a basis for analysis of the fuel combustibility.