| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of producing acrylic acid by the gas-phase catalytic oxidation of acrolein, capable of stably producing acrylic acid at a high yield for a long period of time. SOLUTION: Upon packing reaction tubes of a fixed bed reactor of a heat exchanging type with a catalyst comprising molybdenum and vanadium as essential components for use in carrying out the gas phase oxidation of acrolein in the presence of molecular oxygen or a gas comprising molecular oxygen, a packing density of the catalyst charged into the respective reaction tubes is 0.90 g/cm<SP>3</SP>or higher and the surface area of the catalyst charged per unit volume is 2,000 to 6,000 m<SP>2</SP>/L (liter). COPYRIGHT: (C)2011,JPO&INPIT
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