Method for distilling ammonia
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United States of America Patent
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Nov 19, 2002
Grant Date -
N/A
app pub date -
Jun 6, 2001
filing date -
Jul 22, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to an improved process for distilling ammonia from a mixture, more particular from a mixture resulting from the reaction between aminonitrile and water (which reaction is also called cyclizing hydrolysis). The process for distilling the ammonia contained in an aqueous caprolactam solution, uses a column with a bottom temperature less than or equal to 160.degree. C. and at an absolute pressure less than or equal to 5 bar, the ammonia distilled at the top of the column being compressed to a pressure greater than or equal to 10 bar and then condensed at a temperature of 25.degree. C. to 60.degree. C.
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