Process for preparing caprolactam by Beckmann rearrangement
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United States of America Patent
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Apr 1, 2008
Grant Date -
Apr 12, 2007
app pub date -
May 17, 2004
filing date -
May 23, 2003
priority date (Note) -
Expired
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Abstract
The invention relates to a process for preparing caprolactam by Beckmann rearrangement of cyclohexanone oxime by feeding cyclohexanone oxime to a reaction mixture comprising (i) sulfuric acid (ii) SO.sub.3 and (iii) caprolactam , wherein the SO.sub.3 content of the reaction mixture is between 9 and 20 wt. % and the molar ratio M of the reaction mixture defined as (n.sub.so3+n.sub.H2SO4)/n.sub.cap is between 1 and 1.4, wherein n.sub.so3=quantity of SO.sub.3 in reaction mixture, in mol n.sub.so3=quantity of H.sub.2SO.sub.4 in reaction mixture, in mol n.sub.cap=quantity of caprolactam in reaction mixture, in mol.
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