Chemical Engineering Equipment and Operating Conditions Quiz
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Questions and Answers

Why is there no reason to use high pressure from a thermodynamic point of view?

  • High pressure increases the equilibrium conversion.
  • High pressure accelerates the reaction rate.
  • High pressure has no effect on the equilibrium conversion. (correct)
  • High pressure decreases the equilibrium conversion.
  • What is the only positive effect on the equilibrium conversion predicted by thermodynamics?

  • High pressure
  • Large excess of hydrogen (correct)
  • Presence of reaction products in the feed
  • High temperature
  • In a region where reaction kinetics control, what happens to the reaction rate with increasing temperature?

  • The reaction rate decreases.
  • The reaction rate increases. (correct)
  • The reaction rate remains constant.
  • The reaction rate becomes zero.
  • What is the activation energy for the rate of reaction for the hydrodealkylation of toluene?

    <p>148.1 kJ/mol</p> Signup and view all the answers

    What would be the approximate increase in reactor size if the reaction were carried out at 400 °C instead of 600 °C?

    <p>100 times larger</p> Signup and view all the answers

    What effect did the large excess of hydrogen have on the equilibrium conversion?

    <p>Increased equilibrium conversion</p> Signup and view all the answers

    Why is maintaining a gas phase important in a reaction?

    <p>To increase the reaction rate</p> Signup and view all the answers

    What happens to the equilibrium conversion of a reaction if the temperature is increased?

    <p>Equilibrium conversion decreases</p> Signup and view all the answers

    In a high-pressure reaction, why are equal moles of reactants and products important?

    <p>To maintain stoichiometry</p> Signup and view all the answers

    How does an excess of hydrogen in a reaction affect the selectivity?

    <p>Increases selectivity</p> Signup and view all the answers

    What does the reaction rate equation k reaction = k0e^{−E act/RT} indicate about the relationship between temperature and reaction rate?

    <p>As temperature decreases, reaction rate increases</p> Signup and view all the answers

    Why is using high temperature in a reaction not justified from a thermodynamic point of view?

    <p>It can't be justified from a thermodynamic point of view</p> Signup and view all the answers

    Why is there a significant economic penalty for using more than 400% excess hydrogen in the reactor feed?

    <p>Excess hydrogen results in the formation of side products.</p> Signup and view all the answers

    Why is methane considered as an inert in the reactor feed?

    <p>Methane does not significantly participate in the reaction.</p> Signup and view all the answers

    What is the primary effect of pressure on gas phase reactions?

    <p>Pressure affects the concentration of reactants, thereby influencing the reaction rate.</p> Signup and view all the answers

    Why are distillation and membrane separation mentioned as methods for handling hydrogen and methane streams?

    <p>To separate methane from hydrogen effectively.</p> Signup and view all the answers

    What is the significance of using refrigeration when the temperature is less than 40ºC?

    <p>To maintain a suitable temperature for reaction kinetics</p> Signup and view all the answers

    Why is using more than 400% excess hydrogen economically unfavorable despite its benefits?

    <p>The economic penalty arises due to excessive hydrogen usage.</p> Signup and view all the answers

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