绝热固定床反应器的乙醇脱水制乙烯反应工艺

为开发新型生物质乙醇脱水制乙烯反应工艺,采用了上海石油化工研究院开发的氧化铝催化剂,在绝热床反应器中进行了工艺实验优化研究。考察了不同水醇质量比、空速和反应器进口温度等对乙醇转化率和乙烯选择性的影响,应用该实验数据,结合前期建立的该催化剂上的乙醇脱水催化反应本征动力学,对该催化剂上的乙醇脱水催化反应本征动力学方程系数进行校正,计算出关于关键组分的该催化剂的效率因子,建立了更适宜于工业应用的宏观动力学模型,模型计算结果与实验数据吻合较好。相对于等温固定床反应工艺或单段绝热床反应工艺,所研发的氧化铝催化剂上四段绝热床反应工艺的能耗降低,乙醇转化率提高,乙烯选择性得到很大的提高,为工业反应器的优化设计以及放大提供必须的工艺设计数据。

Process for Dehydration of Ethanol to Ethylene in a Adiabatic Fixed Reactor

To develop the new process for the dehydration of bio-ethanol producing ethylene, the optimal process experiment was carried out in the adiabatic reactor using the alumina catalyst made by Shanghai Research Institute of Petrochemical Technology developed The effects of different ratio of water to alcohol, space velocities and temperature on ethanol conversion and ethylene selectivity were examined. Using the experimental data, the coefficients of the intrinsic reaction kinetics equation on this catalyst for the key components of ethanol and ethylene were calibrated. The efficiency factors of the key components were also calculated and the macro kinetics models of biomass ethanol dehydration, which is more suitable for the industrial application was established. The calculated results were in good agreement with the experimental data. With respect to the isothermal fixed or single adiabatic bed reaction process, this newly developed four adiabatic reaction technology on alumina catalyst performs well in reducing energy consumption, increasing the conversion of ethanol and improving the ethylene selectivity. These could provide necessary data for optimization and amplification of industrial reactor design.