The present invention provides a process for purifying {TAIL ~ a polar vinyl compound}, comprising pressurizing 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., {HEAD ~ 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 the crystals of the polar vinyl compound from a liquid phase under pressure 
The present invention provides a process for purifying { TAIL ~ a polar vinyl compound } , comprising pressurizing 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. , { HEAD ~ 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 the crystals of the polar vinyl compound from a liquid phase under pressure
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH