| 摘要 |
e -Caprolactam is prepared by reacting e -caprolactone with ammonia at a temperature not lower than 200 DEG C. and superatmospheric pressure, and removing the e -caprolactam from the reaction mixture, the reaction mixture having been rapidly chilled to between 100 DEG and 15 DEG C. Preferred temperatures and pressures are 320 DEG to 360 DEG C. and 50 to 265 atmospheres. In the examples cooling to 30 DEG C. is effected by ejection through a tube kept at 0 DEG C. The ammonia may be dry or aqueous and a further solvent, e.g. dioxane may be present. The e -caprolactam may be extracted with chloroform if an aqueous solution is used, and the aqueous phase may be recycled to the autoclave to give a further yield of caprolactam. |
