7. Aromatic hydrocarbons can be extracted from cracking or reforming products by extraction with sulfolane (tetra-methylene sulfone). Determine the distribution coefficient for the system under consideration if after 4-stage extraction using an equal volume of extractant at each stage (VB = Vo)> the aromatics content in the feedstock decreases from 31.41 to 2.64%.
Answer: 1.17.

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