Patent Number: 8,088,947

Title: Method for producing methacrolein and/or methacrylic acid

Abstract: The present invention relates to a method for producing methacrolein and/or methacrylic acid characterized in that the catalyst filling length of a dehydration catalyst layer is 3 to 20% of the catalyst filling length of an oxidation catalyst layer in a method where raw material gas containing gaseous t-butanol is supplied to a fixed-bed multitubular reactor having a dehydration catalyst layer and an oxidation catalyst layer in this order, from the entrance for raw material gas toward the exit, to produce methacrolein and/or methacrylic acid by dehydration reaction and catalytic gas phase oxidation reaction, and the present invention can increase the conventional yield of approximately 80% to 81 to 82% even when a reaction bath temperature is relatively low (approximately 355.degree. C.).

Inventors: Kurakami; Tatsuhiko (Sanyoonoda, JP), Kojima; Toshitake (Takasaki, JP), Seo; Yoshimasa (Takasaki, JP)

Assignee: Nippon Kayaku Kabushiki Kaisha

International Classification: C07C 51/12 (20060101); C07C 51/16 (20060101); C07C 45/00 (20060101); C07C 51/14 (20060101)

Expiration Date: 2020-01-03 0:00:00