Chemical Engineering

Download Chemical Reactor Design and Control by William L. Luyben PDF

By William L. Luyben

Chemical Reactor layout and keep watch over makes use of technique simulators like Matlab®, Aspen Plus, and Aspen Dynamics to review the layout of chemical reactors and their dynamic keep an eye on. there are various books that concentrate on steady-state reactor layout. There aren't any books that think of useful regulate platforms for genuine business reactors. This specific reference addresses the simultaneous layout and keep watch over of chemical reactors. After a dialogue of reactor fundamentals, it: Covers 3 forms of classical reactors: non-stop stirred tank (CSTR), batch, and tubular plug circulate Emphasizes temperature keep watch over and the serious impression of steady-state layout at the dynamics and balance of reactors Covers chemical reactors and keep an eye on difficulties in a plantwide setting contains quite a few tables and indicates step by step calculations with equations Discusses tips to use approach simulators to deal with different matters and kinds of operationsThis is a pragmatic reference for chemical engineering execs within the strategy industries, execs who paintings with chemical reactors, and scholars in undergraduate and graduate reactor layout, strategy keep an eye on, and plant layout classes.

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These classical reactors are idealizations of real industrial reactors. Perfect mixing is assumed in classical batch and CSTR reactors, but mixing is never perfect in an agitated vessel, no matter how intense the mixing. No axial mixing and no radial gradients (plug flow) are assumed in the classical PFR tubular reactor, but the flow patterns in a real tubular reactor are never without some axial mixing and differences in flow velocities and properties at different radial positions. However, the classical idealizations are usually close enough to reality so that they can be used for studying both steady-state design and the dynamic control of chemical reactors.

Selecting the best time – temperature trajectory is a challenging dynamic optimization problem with constraints. There are rigorous nonlinear programming approaches to this problem, but there are also some more simple and practical methods that can be employed, as discussed in Chapter 4. 4. All the heat transfer configurations used on CSTRs can be applied to batch reactors. 9 Adiabatic tubular reactor. Mathematical models of batch reactors and control strategies are developed in Chapter 4. Both classical batch and fed-batch reactors are discussed using numerical examples.

Reactant concentrations decrease and product concentrations increase with time. Temperature or pressure is controlled according to some desired time trajectory. Batch time is also a design and operating variable, which has a strong impact on productivity. Temperature profiles are established so that conversion and yield objectives are achieved while not exceeding heat transfer capacity limitations. These optimum temperature profiles depend on the chemistry. For example, if the reaction is reversible and exothermic, the temperature profile may ramp up to a high temperature to get the reactions going and then drop off with time to avoid the decrease in the chemical equilibrium constant at high temperature.

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