Process of recovering .epsilon.-caprolactam from PA-6 synthesis extract water
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United States of America Patent
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Jul 25, 2000
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N/A
app pub date -
Oct 9, 1998
filing date -
Dec 2, 1997
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Abstract
The invention comprises a process of producing .epsilon.-caprolactam from extract water of polycaprolactam obtained by hydrolytic polymerization, wherein (i) the extract water is concentrated by distillation of water, (ii) from the concentrated extract water from stage (i) an extract of .epsilon.-caprolactam and oligomers including dimers is obtained by separating an .epsilon.-caprolactam/water vapor mixture, (iii) the extract from stage (ii) is depolymerized in the presence of a catalyst and superheated steam, where a vapor mixture of .epsilon.-caprolactam and water is obtained, and (iv) from the .epsilon.-caprolactam/water vapor mixtures of process stages (ii) and (iii) .epsilon.-caprolactam with a dimer content of .ltoreq.0.2 wt-% is obtained by distillation of water.
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