摘要
采用半经验的乙醇脱水制乙烯反应动力学模型,建立了乙醇脱水制乙烯等温固定床反应器的一维模型。利用工业生产数据对所建模型进行了验正,反应器出口温度、乙醇转化率、乙烯选择性的计算值与实际值的偏差分别是-1.65 K,-0.66%,0.43%。采用该模型模拟了加热介质温度、进料空速、乙醇含量对反应器轴向温度分布、乙醇转化率和乙烯选择性的影响。模拟结果表明,加热介质温度在643～683 K内可得到较好的反应器轴向温度分布和乙醇脱水反应结果;适宜的进料空速为0.6 h^(-1),进料空速过高乙醇转化率降低;乙醇含量高有利于提高乙烯的选择性。
Based on semi-empirical kinetic model of ethanol dehydration to ethylene on T-Al2O3 catalyst, a one-dimensional mathematical model of isothermal fixed-bed reactor for ethanol dehydration to ethylene was established. Using industrial production data to verify the model, the deviations of calculated values of reactor outlet temperature, ethanol conversion and ethylene selectivity from the actual data of the plant were - 1.65 K, - 0.66% and 0.43%, respectively. Effects of heating medium temperature, feed space velocity and reactant concentrations in feed on axial temperature distribution in catalyst bed, conversions of ethanol, selectivity to ethylene were simulated. When heating medium temperature is controlled in range of 643 -683 K, appropriate axial temperature distribution and better reaction results can be obtained. Appropriate feed hourly space velocity is about 0.6 h^-1. Higher hourly space will lead to lower conversion of ethanol. Higher content of ethanol in feed is favorable to ethylene selectivity and volume fraction of 95 % is appropriate.
出处
《石油化工》
CAS
CSCD
北大核心
2009年第11期1206-1210,共5页
Petrochemical Technology
基金
国家高技术研究发展计划项目(2006AA020101)
中国石油化工集团公司技术开发项目(L208007)
江苏省基础研究计划(自然科学基金)--企业博士创新项目(SBK200930396)
关键词
乙醇脱水
等温固定床反应器
乙烯
一维模型
模拟
ethanol dehydration
isothermal fixed-bed reactor
ethylene
one-dimensional model
simulation
