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Definition: This calculator determines the mass fraction of solute in the feed stream for a single ideal stage liquid-liquid extraction process.
Purpose: It helps chemical engineers and process designers calculate the feed composition needed to achieve a desired raffinate composition in a single extraction stage.
The calculator uses the formula:
Where:
Explanation: The formula calculates the feed concentration based on the equilibrium relationship between the raffinate and extract phases.
Details: Accurate feed concentration calculation is essential for designing efficient extraction processes and predicting separation performance.
Tips: Enter the raffinate composition, solute-free flowrates for both phases, and the solute distribution coefficient. All values must be > 0.
Q1: What is an ideal extraction stage?
A: An ideal stage is one where the exiting streams (raffinate and extract) are in equilibrium with each other.
Q2: How is the distribution coefficient determined?
A: It's typically determined experimentally by measuring solute concentrations in both phases at equilibrium.
Q3: What units should be used for flowrates?
A: The calculator uses kg/s, but any consistent mass flow units can be used as long as they're the same for both streams.
Q4: Can this be used for multi-stage extraction?
A: No, this calculator is specifically for single-stage extraction calculations.
Q5: What if my distribution coefficient varies with concentration?
A: This calculator assumes a constant distribution coefficient. For variable coefficients, more complex calculations are needed.