Catalysis Reactors

The configuration of the combined pyrolysis/catalysis reactor can pose serious engineering problems as pointed out by Songip et al. Because the catalytic zone relies on the products of thermal degradation as its feedstock, it is difficult to... 

Keywords Catalysis Reactors Continuous flow processes Automated synthesis Monolithic materials Polymers... 

The selection and design of a catalysis reactor depends on the type of process and fundamental process variables such as residence time, temperature, pressure, mass transfer between different phases, the properties of the reactants, and the available catalysts [16]. 

Catalysis reactors can be classified according to their phase conditions. The most important industrial reactor types are two-phase reactors for the system gas/solid and three-phase reactors for the system gas/sohd/liquid [13, 15]. 

The coimterpart of the ideal plug flow reactor is the ideal continuous stirred-tank reactor with complete backmixing of the rection mass. Because of the ideal mixing, the reaction rate is constant, and a simple design equation is obtained for the catalysis reactor (Eq. 14-3). 

The single-bed reactor is the simplest catalysis reactor. It is completely filled with catalyst and is mainly used for thermally neutral and autothermal gas reactions. Owing to its design, the pressure drop is high, and the residence-time distribution has a major influence on the selectivity and conversion of the reaction. Of particular importance is the maintenance of temperature limits, both axially and radially, as heat removal is naturally poor. An advantage is the ease of catalyst regeneration. 

In the present edition some space is dedicated to special topics such as electrocatalysis, photocatalysis, asymmetric catalysis, phase-transfer catalysis, environmental catalysis, and fine chemicals manufacture. On the basis of fundamental reaction engineering equations, examples for calculation and modeling of catalysis reactors are given with the easy-to-learn PC program POLYMATH. Well over 170 exercises help die reader to test and consolidate the gained knowledge. 

Tijm, P.J.A (2008) Gas to Liquids, Fischer-Tropsch Catalysis, Reactors Advanced Energy Technology, Future s Pathway, booklanddirect (www.booklanddirect.com). 

FIGURE 8.3 Heterogeneous catalysis reactor types (a) fixed bed, (b) batch fluid bed, (c) slurry, (d) catalytic gauze, (e) trickle bed, (f) moving bed, (g) continuous fluid bed, and (h) transport line. 

Muhammad, C., OnwudiU, J.A., Williams, P.T., 2015b. Tbermal degradation of real-world waste plastics and simulated mixed plastics in a two-stage pyrolysis—catalysis reactor for fuel production. Energy Fuels 29 (4), 2601—2609. 

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