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Plug-flow reactors energy balance

Axial dispersion Hydrogen mass and energy balance Plug-flow Partially backmixed Present Depends on the turbulence in the reactor (21) ... [Pg.943]

Material and energy balances of a plug flow reactor are summarized in Table 7-7. [Pg.699]

TABLE 7-7 Material and Energy Balances of a Plug Flow Reactor (PFR)... [Pg.700]

Figure 4.7. Energy balancing for the tubular plug-flow reactor. [Pg.233]

This section treats the material and energy balance equations for a plug flow reactor. For steady-state operation the energy balance analysis leading to equation 10.1.4 is appropriate. [Pg.361]

The CRE approach for modeling chemical reactors is based on mole and energy balances, chemical rate laws, and idealized flow models.2 The latter are usually constructed (Wen and Fan 1975) using some combination of plug-flow reactors (PFRs) and continuous-stirred-tank reactors (CSTRs). (We review both types of reactors below.) The CRE approach thus avoids solving a detailed flow model based on the momentum balance equation. However, this simplification comes at the cost of introducing unknown model parameters to describe the flow rates between various sub-regions inside the reactor. The choice of a particular model is far from unique,3 but can result in very different predictions for product yields with complex chemistry. [Pg.22]

Plug Flow Reactor A plug flow reactor (PFR) is an idealized tubular reactor in which each reactant molecule enters and travels through the reactor as a plug, i.e., each molecule enters the reactor at the same velocity and has exactly the same residence time. As a result, the concentration of every molecule at a given distance downstream of the inlet is the same. The mass and energy balance for a differential volume between position Vr and Vr + dVr from the inlet may be written as partial differential equations (PDEs) for a constant-density system ... [Pg.8]

In this section we replace the CSTR by a plug-flow reactor and consider the conventional control structure. Section 4.5 presents the model equations. The energy balance equations can be discarded when the heat of reaction is negligible or when a control loop keeps constant reactor temperature manipulating, for example, the coolant flow rate. The model of the reactor/separation/recycle system can be solved analytically to obtain (the reader is encouraged to prove this) ... [Pg.114]

As has been seen in Sect. 3, the equations of mass, energy and momentum balances for batch and plug flow reactors generally constitute a system of ordinary differential equations, with initial values. It is convenient to write such a system in a compact vector form, viz. [Pg.294]

Example 9.11 Modeling of a nonisothermal plug flow reactor Tubular reactors are not homogeneous, and may involve multiphase flows. These systems are called diffusion convection reaction systems. Consider the chemical reaction A -> bB described by a first-order kinetics with respect to the reactant A. For a nonisothermal plug flow reactor, modeling equations are derived from mass and energy balances... [Pg.483]

PSC-2 The kinetics of the reaction of sodimn hypochlorite and sodium sulfate were studied by the flow thermal method in Jnd Eng. Chem. Fundam., 19, 207 (1980). What is the flow thermal method Can the energy balance developed in this article he applied to a plug-flow reactor, and if not, what is the proper energy balance Under what conditions are the author s equations valid ... [Pg.282]

Up to now we have focused on the steady-state operation of nonisothermal reactors. In this section the unsteady-state energy balance wtU be developed and then applied to CSTRs, plug-flow reactors, and well-mixed batch and semibateh reactors. [Pg.284]

The energy balance equations for a plug flow reactor are given below in Eq. (6) and relate temperature change to either reactor length, z, or reciprocal space velocity, 1/WHSV. [Pg.2563]

Energy balance equations for plug flow reactor... [Pg.2563]

Generalized function mostly unit operations like continuous stirred tank reactor or plug flow reactor for react and distillation column or evaporator for separate" and also new combined operations assumptions are necessary due to lack of some data in advance calculations with linear mass- and energy balances short-cut methods ... [Pg.534]

Recently, Agrawal et al. (2006) had modeled the LDPE reactor as an ideal plug flow reactor and presented all the model equations and parameters for use by researchers. The model equations include ordinary differential equations for overall and component mass balances, energy balance and momentum balance. The reactor model of Agrawal et al. (2006) is adopted, and cost expressions and economic objectives are... [Pg.314]

Since Eqs. 7.1.5 and 7.1.15 contain another dependent variable, 0, flie dimensionless temperature, we should solve the energy balance equation simultaneously with the design equations. For plug-flow reactors with negligible viscous work, the energy balance equation (derived in Section 5.2) is... [Pg.243]


See other pages where Plug-flow reactors energy balance is mentioned: [Pg.424]    [Pg.492]    [Pg.223]    [Pg.424]    [Pg.492]    [Pg.105]    [Pg.380]    [Pg.334]    [Pg.748]    [Pg.11]    [Pg.12]    [Pg.13]    [Pg.131]   
See also in sourсe #XX -- [ Pg.314 , Pg.317 ]




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