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US 5,856,568 AGranted
Process for inhibiting polymerization of a vinyl compound
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsKenji Okamoto, Takashi Nakagawa, Kouji Tomita
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AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsKenji Okamoto, Takashi Nakagawa, Kouji Tomita
Estimating the term…
A process for inhibiting polymerization of a vinyl compound comprising using (A) one or both of N-nitrosophenylhydroxylamine and a salt thereof in combination with (B) a salt of copper or in combination with (B') a metal salt of a dialkyldithiocarbamic acid and (C) at least one selected from the group consisting of inorganic acids, salts of inorganic acids, and water. In accordance with the above process, stable continuous operation of a process for producing a vinyl compound, particularly acrylic acid or methacrylic acid, such as a distillation process of the vinyl compound, for a long time is enabled by effectively suppressing polymerization of the vinyl compound in the process or by effectively suppressing polymerization of the vinyl compound in the process while corrosion of the apparatus for the production is prevented.
A process for inhibiting polymerization of a vinyl compound comprising using (A) one or both of N-nitrosophenylhydroxylamine and a salt thereof in combination with (B) a salt of copper and (C) at least one of phosphoric acid, boric acid, salt of phosphoric acid, salt of boric acid or water, said water being present in an amount of 0.05 to 5% by weight based on the amount of vinyl compound.
A process for inhibiting polymerization of a vinyl compound comprising using (A) one or both of N-nitrosophenylhydroxylamine and a salt thereof in combination with (B') a metal salt of a dialkyldithiocarbamic acid and (C) at least one of phosphoric acid, boric acid, salt of phosphoric acid, salt of boric acid or water, said water being present in an amount of 0.05 to 5% by weight based on the amount of vinyl compound.
A process for inhibiting polymerization of a vinyl compound comprising using a composition consisting essentially of (A) one or both of N-nitrosophenylhydroxylamine and a salt thereof in combination with (B') a metal salt of a dialkyldithiocarbamic acid and (C) at least one member selected from the group consisting of inorganic acids, salts of inorganic acids, and water.
Dependencies are inferred from the claim text.