Reactors semi continuous

The influence of inhibitor on the performance of a semi-continuous reactor can be, in some ways, similar to both batch and continuous systems. A dead time is usually observed upon addition of the initial charge. When the secondary stream flow is started after some reaction of the initial charge, additional inhibitor flows into the reactor and the initiation rate drops. When this programmed addition is stopped the initiation rate increases sometimes enough to cause temperature control problems. 

Semi-continuous reactors can be used to produce very narrow or quite broad particle size distributions depending on the nature of the secondary feed stream and how it is added to the reactor. 

Recipe additions can also be important with semi-continuous reactors. Addition rates influence reactor performance, and incorrect addition location can lead to non-uniform reaction within the reactor, localized flocculation, and reactor short-circuiting. 

Let us assume an adiabatic, semi-continuous reactor (see Sec. 3.2.4) with negligible input of mechanical energy (Fig. 1.22). 

In this chapter the simulation examples are described. As seen from the Table of Contents, the examples are organised according to twelve application areas Batch Reactors, Continuous Tank Reactors, Tubular Reactors, Semi-Continuous Reactors, Mixing Models, Tank Flow Examples, Process Control, Mass Transfer Processes, Distillation Processes, Heat Transfer, and Dynamic Numerical Examples. There are aspects of some examples which relate them to more than one application area, which is usually apparent from the titles of the examples. Within each section, the examples are listed in order of their degree of difficulty. 

SEMIPAR - Parallel Reactions in a Semi-Continuous Reactor... 

A semi-continuous reactor is used to carry out the parallel reaction shown below. It is of interest to investigate how the amount of desired product, P, depends on the differing orders of the two reactions and on the feeding rate. 

Figure 5.98. Parallel reactions in a semi-continuous reactor.

An exothermic reaction involving two reactants is run in a semi-continuous reactor. The heat evolution can be controlled by varying the feed rate of one component. This is done with feedback control with reactor temperature... 

Semi-continuous reactor 423, 426, 475, 518 Semi-dimensionless form 649 Sensitivity... 

The Effect of Residence Time The final parameter that was studied was the solid residence time. In the semi-continuous reactor used for this study, the volatile product is swept from the reactor by a continuous stream of hydrogen and, therefore, there is both a vapour and solid residence time. It is this latter parameter that has been studied here and the solid residence time was considered to be the time that the reactor spends at temperature. For the study of the residence time, tin (1 % of the coal) as stannous chloride was used as the catalyst and the other conditions are given in Table II. 

Case C Parallel Reaction in a Semi-Continuous Reactor with Large Temperature Changes... 

A semi-continuous reactor is used to carry out the following parallel reaction, where P is valuable product and Q is unwanted waste. The problem is to optimise the feed strategy to the reactor such that the maximum favourable reaction selectivity is obtained, for similar systems but of differing kinetic rate characteristics. 

SELCONT - Optimized Selectivity in a Semi-Continuous Reactor System... 

Fig. 1 Semi-continuous reactor with feeding of ketone reactant.

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