chapter 11 Flashcards
What are reactors?
Vessels in which controlled chemical reactions are initiated and sustained
Raw materials that are added to undergo changes during a reaction
answer A
What is the term used for the raw materials that a facility adds to the reactor in a batch operation?
Products
Reactants
answer B
In batch operations, what is the product?
A substance formed as a result of a chemical reaction
A substance used to facilitate the rate of a chemical reaction without being consumed in the reaction
answer A
If excessive heating or cooling is expected due to the endothermic (heat absorbing) or exothermic (heat releasing) nature of the reaction, cooling water or steam can be circulated through a jacket on the outside of the vessel or through ________ on the inside of the reactor vessel to help control the temperature of the reaction.
pumps
vents
coils
answer C
Most batch reactors are ________ in shape.
Cubic
cylindrical
tubular
answer B
What do stirred tank reactors use to facilitate the mixing of reactants?
High temperature
High pressure
agitators
answer C
Which types of reactions are facilitated by ultraviolet light?
Photosensitive reactions
Precipitations Reactions
answer A
It is very important not to add reagents too quickly in ________.
highly exothermic reactions
highly endothermic reactions
answer A
When may a sparger or distribution plate be used to improve contact with reactants or catalysts?
when adding solid materials
when adding gas
answer B
When precise measurements are needed, each reactant is measured by mass or volume as it is added using either ________ or a flow totalizer.
a load cell
a sparger
answer A
What is the term for the collection of piping and equipment designed to prevent the overpressurization or underpressurization (vacuum) of a vessel or system?
Agitator
relief system
answer B
What is the biggest concern for highly exothermic reactions?
Exceeding the cooling system’s capacity to absorb the heat produced by the reaction
solidification of polymers
answer A
What may cause reaction material to crystallize in an endothermic (heat-absorbing) reaction?
Runaway reaction
loss of heating
answer B
What can be the result of hot spots in some exothermic reactions?
An increase in temperature and potential overpressurizing
Too rapid mixing of reactants
answerA
Which of the following tasks falls within the process technician’s responsibilities for preparing the batch reactor?
Monitoring outside equipment
cleaning the reactor if needed
answer B
Which of the following tasks falls within the process technician’s responsibilities for shutting down the batch reactor?
emptying reactor contents
purging equipment
answer A
Which types of activities carry concerns about overheating?
Highly exothermic reactions
taking samples
answer A
Which of the following process technician tasks can present burn hazards?
Inspecting the reactor
taking samples
answer B
Which best describes a stirred tank reactor?
An agitated vessel for liquid-liquid, liquid-solid, liquid-gas, gas-gas reactions
A jacketed pipe or multi-tube in shell reactor
answer A
