Photochemical Reactor-Selection of the most suitable reaction temperature for the reactor

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For endothermic reversible reactions, there is no question of the most suitable reaction temperature, because regardless of the thermodynamics and kinetics, heating is beneficial to the reaction, but in fact, the active temperature of the catalyst, side reactions, energy consumption, etc. must also be considered the elements of.

For exothermic reversible reactions, the choice of reaction temperature should take into account both thermodynamic and kinetic factors, from the thermodynamic expression between the equilibrium constant and temperature

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(Reaction rate formula)

It can be seen that from the viewpoint of chemical equilibrium, the higher the temperature, the worse, because the temperature rise will reduce the equilibrium conversion rate, and from the kinetic viewpoint, the higher the temperature, the greater the reaction rate. Therefore, there is a contradiction between the two. Generally, when the temperature is low, the effect of temperature on the reaction rate constant plays a major role, and the effect of temperature on the equilibrium constant is not important, so the reaction rate will accelerate with the rise of temperature; but after reaching a certain temperature, then When the temperature is increased, the equilibrium conversion rate decreases rapidly, so the reaction rate decreases. Therefore, it can be seen that there is an optimum reaction temperature corresponding to the maximum reaction rate.

Ideally, the temperature at each point in the reactor should be controlled at the optimum reaction temperature. At the reactor inlet, because the system is far from equilibrium, increasing the temperature can accelerate the reaction rate and help the reaction reach equilibrium, while at the outlet, reducing the temperature is beneficial to improve the equilibrium conversion rate. Therefore, from the reactor inlet to the outlet, as the reactant The conversion rate continues to increase, and the reaction temperature should gradually decrease, so that each point in the reactor is at the most suitable reaction temperature.

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