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AssigneesShowa Denko K.K., Kabushiki Kaisha Kobe Seiko Sho
InventorsToshiyuki Akizawa, Hiroyuki Hasegawa, Hitoshi Nakamura, Katsufumi Urabe, Shingo Yoshida, Yuichi Matsuda, Tamiharu Sakai
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The present invention provides a process for purifying 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.degree.-100.degree. 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 the crystals of the polar vinyl compound from a liquid phase under pressure.
A process for purifying a polar vinyl compound, comprising pressurizing crude polar vinyl compound containing impurities, including polymerization inhibiting substances and starting materials used in preparation of the polar vinyl compound, to 500.about.3000 atm at 0.degree..about.100.degree. C., the polar vinyl compound having at least one member selected from the group consisting of an oxygen atom, a nitrogen atom and a sulfur atom, to thereby form crystals of the polar vinyl compound and separating the crystals of the polar vinyl compound from a liquid phase under pressure to thereby obtain a highly purified polar vinyl compound.
Dependencies are inferred from the claim text.