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 a crude polar vinyl compound containing impurities such as polymerization inhibiting substances and starting {HEAD ~ materials} used in {TAIL ~ 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 a crude polar vinyl compound containing impurities such as polymerization inhibiting substances and starting { HEAD ~ materials } used in { TAIL ~ synthesis } of the polar vinyl compound
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