Liquid Liquid Extraction

Step 1: Understanding the distribution coefficient.
The distribution coefficient (or partition coefficient) of a solvent is a measure of its relative ability to extract a solute from one phase (usually water) into another phase (such as an organic solvent). The higher the distribution coefficient, the more effective the solvent is for extraction. For acetic acid extraction, the distribution coefficient is typically higher for solvents like ethyl acetate compared to others.
Step 2: Conclusion.
Ethyl acetate is known to have the maximum distribution coefficient at 200°C for the extraction of acetic acid from an acetic acid-water system. Therefore, the correct answer is (2).

Step 1: Understanding the extraction process.
The maximum percentage extraction is determined by the equilibrium relationship between the solute in the two phases. In a co-current extraction unit, the maximum extraction occurs when the concentration of solute in the extract phase reaches its maximum value. This is governed by the equilibrium curve given as: Where is the mole fraction of A in the extract phase, and is the mole fraction of A in the solvent phase. Step 2: Applying the equilibrium data.
To find the maximum extraction, we need to solve for the concentration values where the maximum amount of A is transferred to the solvent phase. The equilibrium relationship indicates that the extraction reaches 0.5 (50%) maximum extraction. Step 3: Conclusion.
The maximum percentage extraction achieved in the unit is 50%. The correct answer is .