摘要
p -Xylene liquid phase oxidation at different temperatures of 186-197 ℃ was carried out to investigate the temperature effect. The kinetics model developed in Part(Ⅰ) was used to fit the data.The rate constants obtained can be well represented by the Arrhenius relationship.The obtained activation energy of different reaction steps ranged from 54 kJ·mol -1 to 93 kJ·mol -1 , among them the activation energy of p -toluic acid to 4-carboxybenzaldehyde step was the highest (92.8 kJ·mol -1 ) and that of 4-carboxybenzaldehyde to terephthalic acid step was the second(84.9 kJ·mol -1 ).They are remarkably higher than the values of the other steps (54.94-67.53 kJ·mol -1 ). This fact showed that oxidation of the second methyl group of p -xylene was more sensitive to the temperature variation than the first one.
p -Xylene liquid phase oxidation at different temperatures of 186-197 ℃ was carried out to investigate the temperature effect. The kinetics model developed in Part(Ⅰ) was used to fit the data.The rate constants obtained can be well represented by the Arrhenius relationship.The obtained activation energy of different reaction steps ranged from 54 kJ·mol -1 to 93 kJ·mol -1 , among them the activation energy of p -toluic acid to 4-carboxybenzaldehyde step was the highest (92.8 kJ·mol -1 ) and that of 4-carboxybenzaldehyde to terephthalic acid step was the second(84.9 kJ·mol -1 ).They are remarkably higher than the values of the other steps (54.94-67.53 kJ·mol -1 ). This fact showed that oxidation of the second methyl group of p -xylene was more sensitive to the temperature variation than the first one.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第7期1013-1016,共4页
CIESC Journal
基金
国家自然科学基金 (No 2 0 0 760 3 9)
中国石油化工股份公司资助项目~~
关键词
对二甲苯
氧化
活化能
动力学
p-xylene,oxidation,activation energy,kinetics
