Process for recovering and purifying caprolactam from an organic solvent
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United States of America Patent
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Feb 1, 2005
Grant Date -
Jun 10, 2004
app pub date -
Jan 14, 2004
filing date -
Mar 1, 2001
priority date (Note) -
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Abstract
Process for recovering caprolactam from a solution comprising caprolactam dissolved in an organic solvent, said process comprising: a) washing the solution with water or an aqueous alkaline solution, resulting in a washed solution comprising caprolactam and organic solvent and in a washing residue, b) evaporating organic solvent from the washed solution, resulting in caprolactam product, c) optionally, hydrogenating the caprolactam product, d) optionally, evaporating water from the caprolactam product, e) distilling the caprolactam product to recover caprolactam and a distillation residue, f) extracting the distillation residue with an organic solvent in the presence of water to obtain (i) an extract comprising caprolactam dissolved in organic solvent and (ii) an aqueous effluent, and g) recycling the extract to step a) or b).
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