| 摘要 |
<p>A method of preparing omega -lactams, in particular caprolactam, comprising: a step of premixing cycloaliphatic acids having the formula <IMAGE> where n=3-13, with a dehydrating agent; the first step of reaction with a nitrosating agent; the second step of reaction with the addition of a very small amount of water corresponding to a molar ratio U=H2O/SO3 within the 0.1 to 0.9 range; and the step of reclaiming the unreacted cycloaliphatic acid. The method affords improved output from the lactamization reaction and reduced byproducts.</p> |
