Evaporation and Distillation Principles
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Questions and Answers

What type of evaporator relies on the natural circulation of the product caused by density differences?

  • Falling Film Evaporator
  • Forced Circulation Evaporator
  • Semi-Batch Evaporator
  • Natural Circulation Evaporator (correct)
  • Which type of evaporator is suitable for liquids prone to fouling, scaling, and crystallizing?

  • Natural Circulation Evaporator
  • Semi-Batch Evaporator
  • Forced Circulation Evaporator (correct)
  • Falling Film Evaporator
  • In which evaporator is forced circulation required when hydrostatic head prevents boiling at the heating surface?

  • Natural Circulation Evaporator
  • Semi-Batch Evaporator
  • Forced Circulation Evaporator (correct)
  • Falling Film Evaporator
  • Which evaporator type allows high liquor velocities through the tubes to minimize the buildup of deposits or crystals along the heating surface?

    <p>Forced Circulation Evaporator</p> Signup and view all the answers

    In which evaporator does liquid circulate at a high rate through the heat exchanger, with boiling being prevented within the unit by virtue of a hydrostatic head maintained above the top tube plate?

    <p>Forced Circulation Evaporator</p> Signup and view all the answers

    What is the objective of evaporation?

    <p>To concentrate the solution of a non volatile solute by vaporizing a portion of volatile solvent</p> Signup and view all the answers

    What factors affect the rate of evaporation?

    <p>Temperature, surface area, and air circulation</p> Signup and view all the answers

    How does evaporation differ from drying?

    <p>Evaporation is a surface phenomenon, while drying is a bulk phenomenon</p> Signup and view all the answers

    Which type of evaporator is used for a simple process?

    <p>Natural circulation evaporator</p> Signup and view all the answers

    What is the rate equation for heat transfer in an evaporator?

    <p>$Q = UA \Delta T$</p> Signup and view all the answers

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