HY分子筛合成ETBE反应本征动力学研究  

Study on Kinetics of Synthesis of ETBE with HY Molecular Sieve

作　　者：刘墨文[1] 周丽娜[1] 徐松波[1] 

机构地区：[1]大庆石化公司化工三厂,大庆163714

出　　处：《广州化工》2007年第6期35-37,共3页GuangZhou Chemical Industry

摘　　要：采用NaY分子筛催化剂经离子交换和高温焙烧得到的HY分子筛,以乙醇和叔丁醇为原料在钢密封间歇反应釜进行醚化反应实验研究。考察了反应温度,反应时间,原料配比,催化剂用量等反应条件对醚化反应的影响。HY分子筛为催化剂合成乙基叔丁基醚(ETBE),建立了反应动力学模型。反应过程在钢密封间歇反应釜中进行,且消除了内外扩散的影响。改变原料浓度和反应温度得到了醚化反应本征动力学实验数据。线性回归得动力学方程r=kCA1.5CB-0.5,求得频率因子A=1.5×107h-1,Ea=64.96 KJ/mol。根据机理近似推导出的动力学方程r=k′CA1。5CB-0.5,频率因子A′=1.4×107h-1,活化能Ea=64.36 KJ/mol。因此,可近似认为表面反应是反应的速率控制步骤。因此,可近似认为表面反应是反应的速率控制步骤。Using the NaY molecular sieve catalyst obtains the HY molecular sieve with the ionic exchangeing and the high temperature roasting. Taking ethylalcohol and tertiary butyl alcohol as raw materials＇ the reaction in steal reacyor studyed was. The reaction temperature, time, the raw material allocated proportion, the catalyst amount used, and effect of the etherification reactian were discussed. The reaction process carries on in the steel seal rhythmic reaction cauldron, also the influence which of internal and external diffusion were eliminated. With the change of raw material density and the reaction temperature, the etherification dynamics empirical datum were obtained. Practical kinetic model of thereaction was got,r=kCA^1.5CB^-0.5, the frequency factor A = 1.5×10^7h^-1, activation energy Ea= 64.96 KJ/mol. At the same time, theoretical model was deduced, the frequency factor A= 1.4 × 10^7h^-1 ,activation energy Ea = 64.36 KJ/mol. The two models showed that surface reaction was the step of reaction rate controlling.

关 键 词：HY分子筛 乙基叔丁基醚 醚化反应 动力学 

分 类 号：TQ243.12[化学工程—有机化工]