Method for producing (meth)acrylic acid

Patent metadata

Field	Value
Publication number	US-9527792-B2
Application number	US-201515034109-A
Country	US
Kind code	B2
Filing date	Apr 27, 2015
Priority date	Apr 30, 2014
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

The present invention provides a (meth)acrylic acid-producing method capable of suppressing formation of carbides so that the production yield of (meth)acrylic acid is enhanced. In such a method, (meth)acrylic acid is produced through gas-phase catalytic oxidation reactions of (meth)acrolein by using molecular oxygen in a fixed-bed reactor configured to have a packed layer containing a packing material and a catalyst layer formed with a catalyst containing at least molybdenum and vanadium. The packed layer contains a packing material that has been used at least once for above gas-phase catalytic oxidation reactions, and the catalyst is present in the packed layer at 0.001˜0.15 mass % of the total amount of the packing material.

First claim

The invention claimed is:

1. A method for producing (meth)acrylic acid, the method comprising:
conducting gas-phase catalytic oxidation reactions of (meth)acrolein by using molecular oxygen in a fixed-bed reactor configured to have a packed layer containing a packing material and a catalyst layer formed with a catalyst containing at least molybdenum and vanadium,
wherein the packed layer contains a packing material that has been used at least once for the gas-phase catalytic oxidation reactions, and
the catalyst is present in the packed layer at 0.001—0.15 mass % of a total amount of the packing material.

2. The method according to claim 1 , wherein the catalyst is present in the packed layer at 0.001—0.1 mass % of the total amount of the packing material.

3. The method according to claim 1 , wherein the catalyst is present in the packed layer at 0.001—0.05 mass % of the total amount of the packing material.

4. A method for producing (meth)acrylic acid, the method comprising:
conducting gas-phase catalytic oxidation reactions of (meth)acrolein by using molecular oxygen in a fixed-bed reactor configured to have a packed layer containing a packing material and a catalyst layer formed with a catalyst containing at least molybdenum and vanadium,
wherein the packed layer contains a packing material that has been used at least once for above gas-phase catalytic oxidation reactions, and
the catalyst is attached to the packing material in the packed layer at 0.001—0.15 mass % of a total amount of the packing material in the packed layer.

5. The method according to claim 4 , wherein the catalyst is attached to the packing material in the packed layer at 0.001—0.1 mass % of the total amount of the packing material.

6. The method according to claim 4 , wherein the catalyst is attached to the packing material in the packed layer at 0.001—0.05 mass % of the total amount of the packing material.

7. The method according to claim 1 , wherein the used packing material is what is obtained by cleaning the packing material used at least once for the gas-phase catalytic oxidation reactions.

8. The method according to claim 7 , wherein the used packing material is what is obtained after the packing material used at least once for the gas-phase catalytic oxidation reactions is soaked in ammonia water and is then cleaned in deionized water.

9. The method according to claim 1 , wherein the packing material is a mixture of the used packing material and an unused packing material.

10. The method according to claim 1 , wherein the packing material is at least one type selected from the group consisting of a silica-alumina material and an SUS material.

11. The method according to claim 1 , wherein the packing material is shaped in at least one type selected from the group consisting of a spherical material and a coil material.

12. The method according to claim 1 , wherein the packing material is at least one type selected from the group consisting of ceramic balls and SUS coil springs.

Assignees

• Mitsubishi Rayon Co

Inventors

• Nitta Masanori
• Satou Toshihiro
• Tatsumi Tomomasa

Classifications

• B01J37/06

  Washing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J27/199

  with chromium, molybdenum, tungsten or polonium · CPC title

• B01J38/68

  including substantial dissolution or chemical precipitation of a catalyst component in the ultimate reconstitution of the catalyst · CPC title

• B01J37/0238

  via the gaseous phase-sublimation · CPC title

• B01J37/03

  Precipitation; Co-precipitation · CPC title