摘要
为促进抑制焦炭劣化技术进步,用热重分析法测得不同温度下BP型抑制剂的抑制焦炭劣化反应动力学实验数据,用未反应核收缩模型对所得数据进行拟合,建立了基于BP型抑制剂的抑制焦炭劣化反应动力学模型,确定了模型参数。统计检验表明模型是显著和可信的。根据Arrhenius方程得到BP型抑制剂抑制焦炭劣化反应活化能Ea=285.0kJ·mol-1和有效扩散活化能ED=164.6 kJ·mol-1,均高于未添加抑制剂的空白焦炭试样S0的劣化反应活化能Ea=142.0kJ·mol-1和有效扩散活化能ED=96.3 kJ·mol-1。依模型算得的抑制焦炭劣化反应过程中的外扩散传质相对阻力ηG/∑η、内扩散传质相对阻力ηD/∑η和界面化学反应相对阻力ηC/∑η数据表明,试样S0的反应主要受界面化学反应和外扩散影响,而试样SBP因负载抑制剂,其反应主要受内扩散和界面反应影响。随着反应的进行,两者的劣化反应受内扩散、界面化学反应同时影响。在较低温度下,焦炭劣化反应主要受界面化学反应控制,随反应温度升高,界面化学反应的相对阻力ηC/∑η逐渐下降。
In order to improve the inhibition technologies of coke deterioration, the kinetic data of the inhibition reaction of coke deterioration by using the BP inhibitor were obtained from thermogravimetric analysis, and based on the unreacted shrinking core model at different temperatures, the obtained data were used to establish the reaction kinetic models. The model parameters were determined and the statistical tests show that the models are significant and credible. According to the Arrhenius equation the activation energy Ea and the effective diffusion activation energy ED of the inhibition reaction of coke samples loaded BP inhibitor are 285.0 kJ·mol^-1 and 164.6 kJ·mol^-1, respectively, which are both higher than that of the blank coke samples, 142.0 kJ·mol^-1and 96.3 kJ·mol^-1, respectively. Based on the kinetic models, the relative resistances of the external diffusion mass transfer, ηG/∑η, the relative resistances of the internal diffusion mass transfer, ηD/∑η, and the relative resistances of interracial chemical reaction, ηC/∑ηwere calculated. The calculated results reveal that the inhibition reaction of sample So is mainly affected by interracial chemical reaction and extemal diffusion, while the inhibition reaction of sample SBp is mainly affected by internal diffusion and interracial reaction at the beginning of the reaction, and then both samples are affected by ηG/∑η and ηD simultaneously. In addition, the inhibition reaction is affected by the interfacial chemical reaction at lower reaction temperature, and then the ηC/∑ηdecreases with the reaction temperature increase.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2013年第5期805-810,共6页
Journal of Chemical Engineering of Chinese Universities
基金
河南省重大公益性科研项目(08110911800)
关键词
焦炭
BP型抑制剂
抑制劣化反应
未反应核收缩模型
动力学
coke
BP inhibitor
inhibition deterioration reaction
unreacted shrinking core model
kinetics
