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Definition: This calculator determines the initial mass fraction of solute in the feed stream based on the performance of N-number of ideal extraction stages in liquid-liquid extraction.
Purpose: It helps chemical engineers design and analyze liquid-liquid extraction processes by determining the required feed concentration to achieve a desired raffinate purity.
The calculator uses the formula:
Where:
Explanation: The formula calculates the required feed concentration based on the equilibrium relationship between the raffinate and extract phases across multiple stages.
Details: Accurate determination of feed concentration is crucial for designing efficient extraction processes, predicting separation performance, and optimizing solvent usage.
Tips: Enter the raffinate solute fraction, solute-free flowrates of both phases, solute distribution coefficient, and number of equilibrium stages. All values must be positive.
Q1: What is the distribution coefficient (KSolute)?
A: It's the ratio of solute concentration in the extract phase to that in the raffinate phase at equilibrium.
Q2: Why use solute-free flowrates?
A: Solute-free basis simplifies calculations by focusing on the carrier and solvent flows independent of solute concentration.
Q3: What's a typical range for KSolute?
A: Typically between 0.1 and 10, depending on the solute-solvent system and operating conditions.
Q4: How does number of stages affect the calculation?
A: More stages generally allow for lower feed concentrations to achieve the same raffinate purity.
Q5: What if I get unrealistic results?
A: Check your input values, especially KSolute and flowrates, as they significantly impact the calculation.