As the space-time increases for an irreversible isothermal reaction conducted in a plug flow reactor, what happens to the reactant conversion________________?
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Answer: A. Increase
Explanation
Increasing space-time gives reactant molecules more residence time inside the plug flow reactor. Longer residence times allow chemical reactions to proceed further toward completion successfully. Higher conversion rates naturally result when reactants spend extended durations reacting inside vessels. Space-time in reactor engineering equals the reactor volume divided by the volumetric feed rate. Plug flow reactors assume no axial mixing and uniform fluid velocity profiles throughout tubes. Reactant conversion measures the fraction of initial feed material transformed into product molecules.
Chemical plant designers adjust reactor lengths and flow rates to optimize target chemical conversions. Optimizing space-time prevents wasteful capital expenditure on excessively large industrial reactor vessels. Continuous manufacturing processes rely on steady flow dynamics to maintain consistent product quality. Decreasing conversion would contradict the fundamental kinetic effect of providing longer reaction times. Remaining constant is impossible because conversion depends directly on reactant residence duration. Assuming insufficient data ignores the well-established mathematical kinetics of plug flow reactors.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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