Download Chemical Reaction Engineering and Reactor Technology by Tapio O. Salmi, Jyri-Pekka Mikkola, Johan P. Warna PDF

By Tapio O. Salmi, Jyri-Pekka Mikkola, Johan P. Warna

IntroductionPreliminary StudiesLaboratory ExperimentsAnalysis of the Experimental ResultsSimulation of Reactor ModelsInstallation of a Pilot-Plant Unit building of the ability in complete ScaleStoichiometry and KineticsStoichiometric MatrixReaction KineticsHomogeneous ReactorsReactors for Homogeneous ReactionsHomogeneous Tube Reactor with a Plug FlowHomogeneous Tank Reactor with excellent MixingHomogeneous BRMolar  Read more...

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3 where A, B, C, and D are the experimentally detectable main components, ∗ denotes a vacant surface site, and A is a molecule adsorbed on the surface site. Adsorbed A (denoted by A∗ ) reacts with a B-molecule from the bulk phase (gas or liquid phase) to form D and release the surface site (∗ ). 3 and is called the Eley–Rideal mechanism. The nature of the surface site depends on the chemical case and the solid catalyst material used. The surface site can be a metal site, an oxide site, and an acidic or a basic site, depending on the catalyst material used.

An example of a desirable main reaction is methanol synthesis CO + 2H2 CH3 OH, which is carried out industrially on a solid catalyst bed. Along with the main reaction, a side reaction also takes place because the feed into the reactor always contains CO2 : CO2 + H2 CO + H2 O. These reactions in the methanol synthesis are parallel reactions in H2 , since H2 reacts simultaneously with CO2 and CO to yield CO and CH3 OH. On the other hand, the reaction scheme can be interpreted to be consecutive in CO, as CO is produced by the latter reaction and consumed by the first one.

60) j This yields the concentration of vacant sites c∗ = c0 1+ Kj cj . 61) The rate expression is rewritten using the concentration of vacant sites, R = k+ KA KB cA cB c∗2 − k− KC cC c∗2 . 63) where Kj cj = KA cA + KB cB + KC cC and (k+ /k− )KA KB /KC = K, the equilibrium constant of the overall reaction. 63: the term is added to the sum Kj cj . A special feature is the dissociative adsorption of a component, for example, hydrogen and oxygen. For this case, we have the adsorption step B2 + 2∗ 2B∗ and the adsorption quasi-equilibrium for B becomes KB = cB2∗ /(cB c∗2 ), yielding cB∗ = √ √ KB cB c ∗ .

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