Kinetics of Inhibition Reaction of Coke Deterioration by BP Inhibitor

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-1and 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 interfacial chemical reaction,ηC /∑η were calculated.The calculated results reveal that the inhibition reaction of sample S0 is mainly affected by interfacial chemical reaction and external diffusion,while the inhibition reaction of sample SBP is mainly affected by internal diffusion and interfacial reaction at the beginning of the reaction,and then both samples are affected by ηG,ηD and ηC simultaneously.In addition,the inhibition reaction is affected by the interfacial chemical reaction at lower reaction temperature,and then the ηC /∑η decreases with the reaction temperature increase.