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Catalyst for methacrylic acid production, method for producing same, and method for producing methacrylic acid

A technology of methacrylic acid and manufacturing methods, applied in the direction of catalyst activation/preparation, organic chemical methods, chemical instruments and methods, etc., can solve the problems of insufficient and uneconomical catalyst reaction results, and achieve high selectivity and high yield Effect

Inactive Publication Date: 2015-12-02
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent Document 3 also discloses a method of mixing the preparation solution, but after the addition of cesium, it is not economical to add the raw material of the heteropolyacid after a drying process.
In addition, the actual situation is that the reaction results of the catalysts obtained by the methods described in Patent Document 1 to Patent Document 3 are not yet sufficient, and further improvement is desired when used as an industrial catalyst.

Method used

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  • Catalyst for methacrylic acid production, method for producing same, and method for producing methacrylic acid
  • Catalyst for methacrylic acid production, method for producing same, and method for producing methacrylic acid

Examples

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Embodiment 1

[0075] 1) Preparation of catalyst

[0076] 800 g of molybdenum trioxide, 30.33 g of vanadium pentoxide, and 76.87 g of 85% by mass orthophosphoric acid were added to 5680 ml of pure water, and heated and stirred at 92° C. for 3 hours to obtain a reddish-brown transparent solution (liquid A). The average particle size of the molybdenum trioxide used at this time was 1.5 μm. Next, this solution was cooled to 0-20 degreeC, and 944.31g was taken into another container. Then, 661.32 g of a 9.1% by mass cesium hydroxide aqueous solution was slowly added to the solution taken into the other container while stirring, and aged at 15 to 20° C. until the electrical conductivity reached neutralization to obtain a yellow slurry (B liquid ). The electrical conductivity was measured using a conductivity meter (CM-60G) manufactured by DKK Toa Corporation. In addition, the electrical conductivity and the pH value (Y axis) of the mixed solution obtained by adding the cesium hydroxide aqueous...

Embodiment 2

[0082] Except changing 661.32 g of the 9.1 mass % cesium hydroxide aqueous solution in Example 1 to 417.07 g of 9.1 mass % cesium nitrate aqueous solution, the coated catalyst was prepared by the same method as in Example 1, and the methacrolein catalyst was supplied. oxidation reaction. In addition, the electrical conductivity and the pH value (Y axis) of the mixed solution obtained by adding the cesium nitrate aqueous solution to the A liquid and the time (X axis) changes are shown in figure 1 .

Embodiment 3

[0084] In Example 1, except that 15.51 g of a 30% by mass aqueous hydrogen peroxide solution was added before the addition of the cesium hydroxide aqueous solution, a coated catalyst was prepared in the same manner as in Example 1, and used for the catalyst oxidation reaction of methacrolein.

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Abstract

A method for producing a catalyst for methacrylic acid production, said catalyst being used for the purpose of producing a methacrylic acid by vapor-phase catalytic oxidation of methacrolein or the like and containing Mo, V, P, Cs, NH4 and Cu as essential active components. This method for producing a catalyst for methacrylic acid production comprises: a step (a) wherein an aqueous heteropolyacid solution or the like (liquid (A)), which contains Mo, P and V as constituent elements, is prepared; a step (b) wherein a slurry liquid (liquid (B)) is prepared by mixing some of the thus-obtained liquid (A) with an aqueous cesium compound solution or the like; and a step (c) wherein a slurry liquid (liquid (C)) is prepared by mixing the rest of the liquid (A) with the liquid (B).

Description

technical field [0001] The present invention relates to a catalyst capable of stably producing methacrylic acid by gas-phase catalytic oxidation of methacrolein, isobutyraldehyde or isobutyric acid without impairing catalytic performance, a production method thereof, and methacrylic acid using the catalyst Production method. Background technique [0002] A large number of catalysts have been proposed as catalysts used for producing methacrylic acid by gas-phase catalytic oxidation of methacrolein, isobutyraldehyde, or isobutyric acid. These catalysts use molybdenum and phosphorus as main components, and have the structure of heteropolyacid and / or its salt. In addition, many proposals have also been made regarding the production methods of these catalysts. [0003] For example, in Patent Document 1, as a method for preparing a catalyst for acrolein or methacrolein synthesis, a method is disclosed in which two or more solutions or dispersions containing catalyst components a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199B01J37/00B01J37/04B01J37/08C07C51/235C07C57/055C07B61/00
CPCB01J27/199B01J37/0009B01J37/0045B01J37/342B01J2523/00C07C51/235C07C51/252C07C57/04B01J2523/15B01J2523/17B01J2523/51B01J2523/55B01J2523/68B01J27/24B01J37/08
Inventor 酒井秀臣今野阳介江尻知幸西村英二
Owner NIPPON KAYAKU CO LTD
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