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    • 55. 发明授权
    • Method of conducting an endothermic reaction in a packed-bed reactor
with external energy addition
    • 在具有外加能量的填充床反应器中进行吸热反应的方法
    • US5710356A
    • 1998-01-20
    • US343218
    • 1994-11-22
    • Bala SubramaniamJon D. Snyder
    • Bala SubramaniamJon D. Snyder
    • B01J8/02C07C5/333C07C5/32
    • B01J8/0285C07C5/333B01J2208/00061B01J2208/00088B01J2208/00097B01J2208/00398B01J2208/00548B01J2219/182Y10S585/91
    • A novel, packed-bed, reverse flow reactor is provided for the endothermic dehydrogenation of ethylbenzene to styrene. The catalyst bed is flanked by inert end sections to prevent the occurrence of the reverse reaction. Ethylbenzene vapor is added at one end of the reactor while superheated steam is added concurrently at a downstream location. The flow direction is periodically reversed by alternating the ethylbenzene introduction between the reactor ends and the steam introduction between axially symmetric locations away from the reactor ends. Employing a steam to ethylbenzene feed ratio of 8:1 to 10.2:1 (as compared to 12:1 to 17:1 employed during conventional adiabatic operation), it is shown that the proposed reverse flow operation produces reactor temperatures that are hundreds of degrees higher than the mixing cup temperature of the feed streams. While catalyst temperatures are at a maximum when the steam is introduced midway between the reactor ends, splitting the steam addition among multiple axially symmetric locations produces lower and more uniform temperatures that are better suited to providing optimum ethylbenzene conversion and styrene selectivity while maintaining efficient utilization of the added energy.
    • 提供了一种新型的填充床逆流反应器,用于乙苯对苯乙烯的吸热脱氢。 催化剂床侧面是惰性末端部分,以防止发生反向反应。 在反应器的一端加入乙苯蒸气,同时在下游位置加入过热蒸汽。 通过交替反应器端之间的乙苯引入和远离反应器端的轴对称位置之间的蒸汽引入来周期性地逆转流动方向。 使用蒸汽与乙苯的进料比为8:1至10.2:1(与常规绝热操作期间的12:1至17:1相比),显示所提出的反向流动操作产生几百度的反应器温度 高于进料流的混合杯温度。 当蒸汽在反应器端部之间的中间引入催化剂温度时,催化剂温度处于最大值,在多个轴向对称位置之间分离蒸汽添加物产生较低和更均匀的温度,其更适合于提供最佳乙苯转化率和苯乙烯选择性,同时保持有效利用 增加的能量。