| 摘要 |
The invention concerns a method for purifying norbornene obtained by reacting dicyclopentadiene or cyclopentadiene and ethylene, the raw reaction mixture containing light impurities, whereof the boiling points are less than that of norbornene; middle weight impurities, whereof the boiling points range between that of norbornene and that of ethyl norbornene; and heavy impurities, whereof the boiling points are higher than that of ethyl norbornene, the latter being moreover included among said heavy impurities. The invention is characterised in that it consists in carrying out a first distillation of the raw reaction mixture in a tailing out column (C1), thereby eliminating part of the heavy impurities and part of the middle weight impurities; then a second distillation of the tailed out raw mixture in a topping column (C2), thereby eliminating the light impurities; and then a third distillation of the resulting topped mixture in a tailing out column (C3), thereby eliminating the remaining heavy and middle weight impurities.
|
