18 Questions
Why is there no reason to use high pressure from a thermodynamic point of view?
High pressure has no effect on the equilibrium conversion.
What is the only positive effect on the equilibrium conversion predicted by thermodynamics?
Large excess of hydrogen
In a region where reaction kinetics control, what happens to the reaction rate with increasing temperature?
The reaction rate increases.
What is the activation energy for the rate of reaction for the hydrodealkylation of toluene?
148.1 kJ/mol
What would be the approximate increase in reactor size if the reaction were carried out at 400 °C instead of 600 °C?
100 times larger
What effect did the large excess of hydrogen have on the equilibrium conversion?
Increased equilibrium conversion
Why is maintaining a gas phase important in a reaction?
To increase the reaction rate
What happens to the equilibrium conversion of a reaction if the temperature is increased?
Equilibrium conversion decreases
In a high-pressure reaction, why are equal moles of reactants and products important?
To maintain stoichiometry
How does an excess of hydrogen in a reaction affect the selectivity?
Increases selectivity
What does the reaction rate equation k reaction = k0e^{−E act/RT} indicate about the relationship between temperature and reaction rate?
As temperature decreases, reaction rate increases
Why is using high temperature in a reaction not justified from a thermodynamic point of view?
It can't be justified from a thermodynamic point of view
Why is there a significant economic penalty for using more than 400% excess hydrogen in the reactor feed?
Excess hydrogen results in the formation of side products.
Why is methane considered as an inert in the reactor feed?
Methane does not significantly participate in the reaction.
What is the primary effect of pressure on gas phase reactions?
Pressure affects the concentration of reactants, thereby influencing the reaction rate.
Why are distillation and membrane separation mentioned as methods for handling hydrogen and methane streams?
To separate methane from hydrogen effectively.
What is the significance of using refrigeration when the temperature is less than 40ºC?
To maintain a suitable temperature for reaction kinetics
Why is using more than 400% excess hydrogen economically unfavorable despite its benefits?
The economic penalty arises due to excessive hydrogen usage.
Test your knowledge on reactors, separators, and other equipment used in chemical engineering processes. Explore the reasons for operating at conditions of special concern, such as maintaining gas phase and improving selectivity.
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