METHOD FOR PRODUCING METHACROLEIN AND/OR METHACRYLIC ACID, AND METHOD FOR PRODUCING METHACRYLIC ACID ESTER

WIPO Patent Application WO/2023/157870

A1

The purpose of the present invention is to provide: a method for producing methacrolein and/or methacrylic acid from isobutanol, the method suppressing the generation of by-products and realizing highly selective production of methacrolein and/or methacrylic acid; and a method for producing methacrylic acid ester from the methacrylic acid obtained.　This foregoing is solved by a method for producing a methacrolein and/or methacrylic acid, the method comprising: (i) a step for supplying an isobutanol-containing gas to a dehydration catalyst layer and causing a isobutanol dehydration reaction to produce a isobutylene-containing gas 1; and (ii) a step for supplying an oxygen-containing gas and a isobutylene-containing gas 2, which contains at least a portion of the isobutylene-containing gas 1, to an oxidation catalyst layer and causing an isobutylene oxidation reaction to produce methacrolein and/or methacrylic acid, where, when the isobutylene content rate of the isobutylene-containing gas 1 is noted as x1 (mol%), and the isobutylene content rate of the isobutylene-containing gas 2 is noted as x2 (mol%), x1/x2 is at least 0.4.

JPS5823853	[Title of the Invention] Method for producing unsaturated aldehyde
WO/2022/106158	TWO-STAGE PREPARATION PROCESS FOR α,β-ETHYLENICALLY UNSATURATED CARBOXYLIC ACIDS AND PLANT FOR THE PURPOSE
JP4970986	A method for producing a composite oxide catalyst and a method for producing an unsaturated aldehyde and / or an unsaturated carboxylic acid using the catalyst.

SUZUKI TATSUYA (JP)
KATO YUKI (JP)

PCT/JP2023/005198

August 24, 2023

February 15, 2023

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MITSUBISHI CHEM CORP (JP)

C07C45/35; C07B61/00; C07C47/22; C07C51/215; C07C57/05

WO2013069630A1	2013-05-16
WO2016002649A1	2016-01-07

JP2013121946A	2013-06-20
JPS5013308A	1975-02-12
JPS4832814A	1973-05-02
JPS58189130A	1983-11-04
JP2021192909A	2021-12-23
JP2014019675A	2014-02-03

JOSHUA D. TAYLOR ; MADELINE M. JENNI ; MATTHEW W. PETERS: "Dehydration of Fermented Isobutanol for the Production of Renewable Chemicals and Fuels", TOPICS IN CATALYSIS, KLUWER ACADEMIC PUBLISHERS-PLENUM PUBLISHERS, NE, vol. 53, no. 15-18, 22 May 2010 (2010-05-22), Ne , pages 1224 - 1230, XP019831608, ISSN: 1572-9028

IP FIRM SHUWA (JP)

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