Reactor concentration single irreversible reactions

A single irreversible reaction A—of unknown order n is carried out in a batch reactor. Taking a solution containing 5 kmol/m of reactant A in the batch vessel, the reactor is maintained at a constant temperature of 315 K. The solution in the reaction vessel is sampled at different time instants and the concentration of A is measured. The measured values of the concentration of A are tabulated below ... 

Assuming that we have an irreversible reaction with a single reactant and power-law kinetics, r = kC, the concentration in a constant-volume isothermal batch reactor is given by integrating the expression... 

Another question is important for the safety assessment At which instant is the accumulation at maximum In semi-batch operations the degree of accumulation of reactants is determined by the reactant with the lowest concentration. For single irreversible second-order reactions, it is easy to determine directly the degree of accumulation by a simple material balance of the added reactant. For bimolecular elementary reactions, the maximum of accumulation is reached at the instant when the stoichiometric amount of the reactant has been added. The amount of reactant fed into the reactor (Xp) normalized to stoichiometry minus the converted fraction (A), obtained from the experimental conversion curve delivered by a reaction calorimeter (X = Xth) or by chemical analysis, gives the degree of accumulation as a function of time (Equation 7.18). Afterwards, it is easy to determine the maximum of accumulation XaCfmax and the MTSR can be obtained by Equation 7.21 calculated for the instant where the maximum accumulation occurs [7] ... 

Given the RTD of two equal-sized CSTRs in series for a single, second-order, Irreversible reaction, compute the reactor effluent concentration for the following cases . segregated how, maximum mixedness. and. two ideal CSTR.s,... 

As mentioned in Section 14.2.6, solving the Navier-Stokes equations allows accounting for the detailed flow patterns in multi-phase reactors. 3D simulations of a bubble column reactor in which a single first-order irreversible reaction A B takes place were described by van Baten and Krishna [2004]. Aim diameter, 5 m high column was simulated. The superficial gas and liquid velocities at the inlet were respectively 0.04 m/s and 0.001 m/s. The inlet concentration of A was varied between 10 and 90%. 

Because the parameter of the axial dispersion model, as observed from numerous experimental studies (58), has been so extensively correlated with Peclet number, designers consider the model useful for scaleup and use it for reactor calculations. The model gives a nice analytical expression for prediction of conversion of a single, irreversible first-order reaction (E(s) in Table 1 with Da replacing s). The expressions for exit concentrations for a system of reversible first-order reactions with the same axial dispersion coefficient (turbulent flow) are much more complex and their evaluation is computationally demanding. 

The kinetics of a liquid-phase chemical reaction are investigated in a laboratory-scale continuous stirred-tank reactor. The stoichiometric equation for the reaction is A 2P and it is irreversible. The reactor is a single vessel which contains 3.25 x 10 3 m3 of liquid when it is filled just to the level of the outflow. In operation, the contents of the reactor are well stirred and uniform in composition. The concentration of the reactant A in the feed stream is 0.5 kmol/m3. Results of three steady-state runs are ... 

The new Liquid Lightning reactor is a single, isothermal, constant-holdup CSTR in which the concentration of ethanol, C, is controlled by manual changes in the feed concentration, Cq. Ethanol undergoes an irreversible first-order reaction at a specific reaction rate k = 0.25/day. The volume of the reactor is 100 barrels, and the throughput is 25 barrels/day. 

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