N-Methyl-2-pyrrolidinone (NMP) has been widely used as a solvent for extraction of coal and coal-derived materials partly because of the high extraction yields obtained with it. The literature contains dozens of articles that describe its use alone and in combination with carbon disulfide, tetracyanoethylene, and other solvents. Extractions have been performed using Soxhlet * To whom correspondence should be addressed.

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