This set of Mass Transfer Puzzles focuses on “Design of Extractor for Multistage Stage Operations”.
1. More than one tie line is represented in an equilibrium triangular system is known as
a) Single stage extractor
b) Multistage extractor
c) Single stage cascades
d) None of the mentioned
Explanation: More than one tie line represents more number of stages.
Explanation: Here three tie lines are used therefore we have three stages.
Explanation: From, the diagram the flow is cross and more than one stages are use so it is a multistage cross flow process.
Explanation: Generally solvent extract the solute from the feed.
Explanation: Two operating lines so two stages.
6. Find the slope of the operating line for the first stage if the dilutant in the feed is 5 kg and the solvent used for the second stage is 10 kg.
d) Data inadequate
Explanation: Here we need data for the solvent used in the first stage to find its slope of operating line.
Explanation: The counter current operating lines are straight line to the equilibrium curve along its same direction.
8. Plait point never occurs in the multistage operations.
Explanation: Plait point is the last tie-line occurs in all extraction.
Explanation: We need the value of R2.
Explanation: Extract is the kg of solute/kg of solvent; Here the value of extract in the second phase is 0.3.
Sanfoundry Global Education & Learning Series – Mass Transfer.
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