Adiabatic reactor batch

The adiabatic batch reactor is completely isolated therefore, no external heat transfer occurs. One can determine the temperature variation as a function of the reactant conversion from Equation 14.78. Thus, we obtain the same expression 14.75, 

Along with the molar or mass balance equation one can calculate the variation of conversion or temperature and determine the reaction time and volume of the adiabatic batch reactor. 

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Figure 6-5a Concentration versus time in an adiabatic batch reactor.

Figure 6-5b Temperature versus time in an adiabatic batch reactor. Fig ure 6-5. Simulation of a non-isothermal batch reactor.

The liquid phase hydrolysis reaction of acetic anhydride to form acetic acid is carried out in a constant volume, adiabatic batch reactor. The reaction is exothermic with the following stoichiometry... 

Figure 5.15. The adiabatic batch reactor with variables of concentration and temperature.

Isolated Systems Isolated systems exchange neither energy nor matter with the environment. The simplest example from chemical or biological engineering is the adiabatic batch reactor. Isolated systems naturally tend towards their thermodynamic equilibrium with time. This state is characterized by maximal entropy, or the highest possible degree of disorder. 

Besides these purely static aspects, the dynamic behavior of an adiabatic batch reactor must also be considered. The adiabatic temperature course is a function of the thermal properties of the reaction mixture. The adiabatic temperature increase influences the final temperature as well as the rate of the temperature increase. For highly exothermal reactions, even for small increase in conversion, the increase in temperature is important (see Section 2.4.3). 

The cooling failure is not considered here, as the adiabatic reactor is designed to work without cooling. If the conditions listed above are fulfilled, the adiabatic batch reactor is inherently safe as far as the charge is guaranteed. The reaction course is not affected by any eventual cooling failure or breakdown of utilities. The batch reactor can be made safe only if it is designed for adiabatic conditions. 

If the feed is suddenly stopped, it behaves as an adiabatic batch reactor with an accumulation corresponding to the non-converted fraction, thus the maximum temperature of the synthesis reaction is... 

An adiabatic batch reactor was constructed from a 2-liter Dewar flask. The reactor top was fabricated from cork, machined to fit and then coated with epoxy resin to seal its pores. 

While the adiabatic batch reactor is important and presents many control issues in its own right, we are concerned here primarily with continuous systems. We consider in detail two distinct reactor types the continuous stirred tank reactor (CSTRj and the plug-flow reactor. They differ fundamentally in the way the reactants and the products... 

Intermediate Steps in Adiabatic Batch Reactor Derivation... 

Temperalutc conversion tclaiiORship for an adiabatic batch reactor (or any reactor operated adiabatically for that mailer ... 

P9-8. Straight forward adiabatic batch reactor calculation. 

The maximum temperature rise or drop AT ax in an adiabatic batch reactor occurs when equilibrium is achieved. By definition, there is no conversion of reactants to products at t = 0. Hence,... 

Equation 3.235 is the same as Equation 3.225 derived for the adiabatic batch reactor. Thus, the variation of temperature T with conversion X, in a PFR operating under adiabatic conditions is written as... 

Do not exchange matter or energy with the surrounding. Example is adiabatic batch reactors. 

Do not exchange matter with the environment or surrounding, but do exchange energy. Example is a non-adiabatic batch reactor. 

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