摘要
以乙烯厂裂解碳五馏分和甲醇为原料,以国产QRE型大孔磺酸树脂为催化剂,在固定床反应器中考察了液相合成甲基叔戊基醚反应体系的热力学特征。对理论和实验数据的分析表明,反应体系中同时存在醚化和异构化3对可逆反应,异戊烯中2-甲基-1-丁烯比2-甲基-2-丁烯的醚化活性高;反应在低温(低于60℃)时由动力学控制,升高反应温度可提高异戊烯的转化率,在60℃时异戊烯的转化率达69.86%;高温(60℃以上)时,热力学平衡占主导地位,反应很快达到平衡,空速对异戊烯转化率的影响不大,在研究建立动力学模型时必须考虑热力学因素的影响。平衡常数的理论计算值与本实验的计算值相差较大,应用于该反应体系的热力学基础数据需进一步修正。
Synthesis of tert-amyl methyl ether from methanol and cracking C5 fraction, and thermodynamic characteristics of the etherification system were studied, Experiments were carried out in a tubular reactor at 50-80℃ on strong cation-exchange resin catalyst. There were mainly three simultaneous reversible reactions two etherifications and one isomerization of isopentenes. Etherification of a-olefins was easier than that ofβ-olefines. At lower temperature, reaction rates were controlled by kinetic factors,increasing reaction temperature led to higher conversion of isopentenes, At 60℃, the highest conversion was 69. 86%. At above 60℃, reactions were mainly affected by thermodynamic equilibrium and the equilibrium reached quickly, Liquid hourly space velocity influenced conversion only slightly. During establishment of kinetic model, thermodynamic factors must be taken into account. Experimental equilibrium constant of this study didn＇ t agree well with values predicted from thermochemical data. Their further modification should be considered.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第7期624-628,共5页
Petrochemical Technology
基金
中国石油中青年创新基金项目(05E7002)
关键词
裂解
碳五
甲醇
异戊烯
甲基叔戊基醚
热力学
催化剂
cracking
C5 fraction
methanol
isopentene
tert-amyl methyl ether
thermodynamics
catalyst
