Decompressed azeotropic method,a totally new method for the preparation of N-phenyl maleimide(N-PMI),is developed on the basis of acetic anhydride method and atmospheric azeotropic method.

• 在乙酐法和共沸脱水法的基础上,开发了一条新工艺,减压共沸法合成N-苯基马来酰亚胺。