The present invention provides a process for purifying a polar vinyl compound, comprising pressurizing {TAIL ~ a crude polar vinyl compound} containing impurities such as polymerization inhibiting substances and components of starting materials used in preparation of the polar vinyl compound to 500 3000 atm at 0° 100° C., the polar vinyl compound having at least one member selected from among oxygen, nitrogen and sulfur atoms, to thereby form crystals of the polar vinyl compound and separating {HEAD ~ the crystals} of the polar vinyl compound from a liquid phase under pressure 
The present invention provides a process for purifying a polar vinyl compound , comprising pressurizing { TAIL ~ a crude polar vinyl compound } containing impurities such as polymerization inhibiting substances and components of starting materials used in preparation of the polar vinyl compound to 500 3000 atm at 0 ° 100 ° C. , the polar vinyl compound having at least one member selected from among oxygen , nitrogen and sulfur atoms , to thereby form crystals of the polar vinyl compound and separating { HEAD ~ the crystals } of the polar vinyl compound from a liquid phase under pressure
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