METHOD FOR PRODUCING ACRYLIC ACID - NIPPON CATALYTIC CHEM IND

Title:

METHOD FOR PRODUCING ACRYLIC ACID

Document Type and Number:

WIPO Patent Application WO/2021/145233

Kind Code:

A1

Abstract:

[Problem] To provide a method for producing acrylic acid capable of improving the yield of acrylic acid and lengthening the service life of a catalyst in a method in which acrylic acid is produced by gas-phase catalytic oxidation of acrolein. [Solution] A production method in which a gas that contains acrolein is supplied to a fixed-bed reactor filled with catalysts of different activities such that two or more catalyst layers are formed in the axial direction of a reaction tube, and the acrolein is subjected to gas-phase catalytic oxidation to produce acrylic acid, wherein: the catalyst X having the highest activity among the catalysts packed in all of the catalyst layers is disposed in some or all of a region up to 30% of the length of all of the catalyst layers from the gas-outlet-side rearmost portion toward the gas-inlet side of all of the catalyst layers; the catalytic activity component x in the catalyst X has Mo and V and, optionally, Cu; when Cu is included, the Cu content is 0.8 mol or less per 12 mol of Mo; and the specific surface area of the catalytic activity component x is 15 m2/g-40 m2/g.

Inventors:

IGATA NAO (JP)
OKUNO MASAAKI (JP)
NAKANISHI TATSUYA (JP)

Application Number:

PCT/JP2021/000088

Publication Date:

July 22, 2021

Filing Date:

January 05, 2021

Export Citation:

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Assignee:

NIPPON CATALYTIC CHEM IND (JP)

International Classes:

C07C51/235; B01J23/28; B01J23/30; B01J23/887; B01J23/888; B01J27/057; C07B61/00; C07C57/04

Foreign References:

JPH0710802A	1995-01-13
JP2005224660A	2005-08-25
JPH05213813A	1993-08-24
JP2020003870A	2020-01-09

Other References: