To eliminate the feeding device coking deposit in a commercial pyridine synthesis reactor, a coupled fluidized bed reactor is proposed. The coupled reactor is composed of a feeding zone (FZ), a riser reaction zone (RRZ), and a fluidized bed reaction zone (FRZ). During 15 days of continuous operation, there is no coke deposit in the feeding device. Experimental results show that the product yield reaches as high as 75%. The selectivity is around 2.5 and is higher than that in commercial reactors, which is around 2.2. A core–annulus model and a dispersion model are proposed to model different zones of this coupled reactor, and the predicted average deviation from experimental data is 12%. The prediction results show that the main reactions take place at FZ and FRZ. RRZ contributes the least conversion, because of the limit by the mass transfer between the core and the annulus.

中文翻译：

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耦合流化床反应器用于吡啶合成

为了消除在商业上的吡啶合成反应器中的进料装置结焦沉积物，提出了一种耦合流化床反应器。偶合反应器由进料区（FZ），提升管反应区（RRZ）和流化床反应区（FRZ）组成。在连续运行的15天中，进料装置中没有积碳。实验结果表明，该产品收率高达75％。选择性约为2.5，高于商业反应器的选择性，约为2.2。提出了核-环空模型和弥散模型来模拟该耦合反应器的不同区域，并且与实验数据的预测平均偏差为12％。预测结果表明，主要反应发生在FZ和FRZ。RRZ带来的转化最少，