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