Step-by-Step Guide: Multi-Stage Pyridine Extraction Using Triangular Coordinates

Are you a chemical engineering student struggling with liquid-liquid extraction problems? This tutorial walks you through a real-world example: reducing pyridine concentration from 50% to 2% in an aqueous solution using chlorobenzene as the solvent. We’ll solve it using triangular coordinates, a key concept in separation processes.

PROBLEM 4

A 2000 Kg batch of pyridine-water solution, 50% pyridine, is to be extracted with an equal weight of chlorobenzene. The raffinate from the first extraction is to be reextracted with a weight of solvent equal to the raffinate weight, and so on (B2= R1, B3 = R2, etc.). How many theoretical stages and what total solvent will be required to reduce the concentration of pyridine to 2% in the final raffinate? Solve on triangular coordinates.

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