Exam (elaborations)
CHEMICAL REACTION ENGINEERING COMPLETE EXAM
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CHEMICAL REACTION ENGINEERING COMPLETE EXAM...
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chemical reaction engineering - ANSWER field that studies the rates andmechanisms of chemical reactions and the design of the reactors in which
chemical reactions take place
aim of chemical reaction engineering - ANSWER maximise selectivity yield
and energy efficiency
chemical reaction - ANSWER process in which one or more substances are
converted to one or more different substances
Change in atomic content, configuration, or chemical identity of a molecule of a
particular chemical species through interaction with molecules of other
chemical species
chemical equation - ANSWER chemical change in terms of symbols and
formulae of reactants and products
chemical equilibrium - ANSWER state in which both reactants and products
are present and have no further tendency to change in their concentration with
time
le chatelier's principle - ANSWER if a system at equilibrium is subjected to
change in concentration temperature volume or pressure then the system re
adjust itself to counteract the effect of the applied change and a new equilibrium
is established
reaction stoichiometry - ANSWER calculation of quantitative relationships of
the reactants and products in a balanced chemical equation
Allows determination of amount of product consumed or produced in reaction
Progress of reaction (Conversion) - ANSWER Ratio of how much reactant has
reacted
Number of moles reacted/ number of moles fed of limiting reactant
Limiting reactant - ANSWER Reactant present in amount less than or equal to
amount required in stoichiometry for reaction completion
, Yield - ANSWER Shows how much of desired product was formed
Selectivity - ANSWER How much desired product was formed in region to
undesired product
Reactors - ANSWER Various sized vessels where chemical reactions take
place
Reaction kinetics - ANSWER Measurement of how quickly reactions occur
Changed by concentration, pressure, temperature and enzyme activities
Reactants - ANSWER species initially involved in chemical reaction which are
subjected to chemical change within the reactor to yield one or more products
What information do kinetics give you - ANSWER -Speed/ time in reactor
What information does contacting give you - ANSWER -Flow patterns/
distribution
What information does reaction performance give you - ANSWER About
design equation
Space time - ANSWER aka holding time or mean residence time
Time necessary to process one reactor volume of fluid based on a particular set
of entrance conditions
Space velocity - ANSWER Reciprocal of space time
rate of reaction - ANSWER speed at which a chemical reaction proceeds in
terms of disappearance of reactant or as the rate of appearance of product per
unit time
average rate - ANSWER obtained by taking change in concentration over a
time interval . approximation of the rate in time interval
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