SHMT 1

    Master this deck with 20 terms through effective study methods.

    Generated from uploaded pptx

    Created by @cymplex

    What is evaporation?

    Vapors from a boiling liquid are removed, concentrating the solution.

    How does evaporation differ from drying?

    Evaporation removes large amounts of water from liquids, while drying removes small amounts from solids.

    What factors affect evaporation rates?

    Temperature, pressure, solubility, and material sensitivity influence evaporation.

    What is boiling point rise (BPR)?

    The increase in boiling temperature of a solution as it becomes more concentrated.

    What is the role of an agitator in evaporation?

    It maintains heat transfer efficiency by preventing low heat transfer coefficients.

    What happens if a solution is concentrated too much during evaporation?

    Crystallization may occur if the solute begins to precipitate.

    What is the overall heat transfer coefficient?

    It quantifies the total resistance to heat transfer across multiple phases.

    What are single-effect evaporators used for?

    They are suitable for small capacities and low steam costs.

    How do multiple-effect evaporators improve efficiency?

    They reuse latent heat from vapor in subsequent effects, reducing steam consumption.

    What is the significance of the Dühring Chart?

    It estimates boiling point rise based on the concentration of solutions.

    What is the purpose of a surface condenser?

    It condenses vapor without mixing it with cooling water.

    What is the impact of scale deposition in evaporators?

    It decreases the overall heat transfer coefficient, affecting efficiency.

    What is forced circulation in evaporators?

    It enhances heat transfer by pumping liquid through the evaporator.

    What is the effect of operating pressure on boiling point?

    Higher pressure raises the boiling point of the solution.

    What is the relationship between feed temperature and heat transfer area?

    Lower feed temperatures require larger heat transfer areas to reach boiling.

    What is the steam economy in evaporation?

    The ratio of vapor produced to steam used, indicating efficiency.

    What happens to the heat transfer coefficient as a solution becomes concentrated?

    It typically decreases, necessitating agitation to maintain efficiency.

    What is the main operation in evaporation processes?

    The removal of solvent, usually water, from a liquid solution.

    What types of equipment are used in evaporation?

    Open kettle, horizontal tube, vertical long tube, falling film, and forced circulation evaporators.

    What is the consequence of foaming in evaporation?

    It can lead to entrainment losses and affect heat transfer.