The present invention ensures ready and efficient production of a polar vinyl compound such as N vinylcarboxamide which is highly purified and thus has {HEAD ~ high polymerizability} from {TAIL ~ a crude polar vinyl compound} containing impurities such as polymerization inhibiting substances and starting materials used in synthesis of the polar vinyl compound 
from
The present invention ensures ready and efficient production of a polar vinyl compound such as N vinylcarboxamide which is highly purified and thus has { HEAD ~ high polymerizability } from { TAIL ~ a crude polar vinyl compound } containing impurities such as polymerization inhibiting substances and starting materials used in synthesis of the polar vinyl compound
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