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AssigneeNippon Kayaku Kabushiki Kaisha
InventorsTomoyuki KAWAMURA, Tomoaki KOBAYASHI, Tatsuhiko KURAKAMI, Hideo YOSHIDA
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A method for producing at least one oxidation product selected from the group consisting of acrolein and acrylic acid is provided. This method can alleviate concerns about deterioration of a gas-phase oxidation catalyst and reaction runaway in a restart period after a shutdown, and can allow the reaction to proceed in a stable state. Using a fixed-bed reactor filled with a gas-phase oxidation catalyst, at least one source gas selected from the group consisting of propylene and acrolein is subjected to a gas-phase contact oxidation reaction while a heating medium is caused to contact with or circulate through the fixed-bed reactor and thereby to heat the fixed-bed reactor. The temperature of the heating medium when the load is maximum in the restart period after the shutdown is controlled to be lower than the temperature of the heating medium when the load is maximum in an initial start-up period.
A method for producing at least one oxidation product selected from the group consisting of acrolein and acrylic acid, with use of a fixed-bed reactor filled with a gas-phase oxidation catalyst, by subjecting at least one source gas selected from the group consisting of propylene and acrolein to a gas-phase contact oxidation reaction while causing a heating medium to contact with or circulate through the fixed-bed reactor and thereby heating the fixed-bed reactor,
Dependencies are inferred from the claim text.