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