摘要
对甲醇制低碳烯烃反应过程进行了热力学分析。着重计算了甲醇制烯烃主副反应的反应热、吉布斯自由能、平衡常数以及烯烃产物之间的平衡关系等。甲醇制烯烃大多数反应为强放热反应,总反应热在37～53kJ/mol之间,而且大多数反应都可以自发进行,并进行到很高的程度。通过烯烃产物之间平衡关系的计算,发现计算结果与实际的甲醇制烯烃反应现象比较一致,随着反应温度的升高,乙烯平衡摩尔分数持续增大,丁烯平衡摩尔分数持续下降,而丙烯摩尔分数则先升后降。烯烃产物之间的相互转化属于热力学平衡限制。
The thermodynamics of methanol to olefins reaction was analyzed, in which the reaction heat, Gibbs free energy, equilibrium constant of main - side MTO reaction and the equilibrium relation among the main olefin products were focused and calculated. The results showed that most of all the reactions were strongly exothermic and overall heat of these reaction was between 37-53 kJ/mol. Furthermore, most of these reactions could proceed automatically and reach a very high level through Gibbs free energy analysis. The results, which was obtained by the calculation of equilibrium composition among the olefin products showed a good coincident with the phenomena of experiment. The mutual reactions among the olefin products were constrained by thermodynamics equilibrium. The results gave a very suitable explanation in the thermodynamics aspect to the question; why ethylene and ethylene plus propylene increase, pro-pylene and butene decrease with increasing temperature?
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2005年第5期349-353,共5页
Chemical engineering of oil & gas
基金
国家重点基础研究发展规划(973计划)项目(2003CB615801)
上海市科委重大基础研究项目(03DJ14004)
中国石油化工股份有限公司重点科技攻关项目。
关键词
甲醇制低碳烯烃
热效应
平衡常数
烯烃平衡组成
methanol to olefins, heat effect, equilibrium constant, olefins equilibrium composition
