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A kind of catalyst for the manufacture of methacrylic acid and its preparation method and application

A methacrylic acid and catalyst technology, which is applied in the direction of catalyst activation/preparation, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of restricting the application range of metal supports and the inability to remove heat in time, and achieve excellent catalytic activity and good Compressive and anti-abrasion strength, effect of prolonging service life

Active Publication Date: 2022-04-19
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent documents CN 103977801 A, CN 103977840 A, and CN104001556 A disclose that metal powder is used as the catalyst carrier to improve the heat transfer efficiency of the catalyst bed, thereby preventing the occurrence of runaway temperature. The catalyst prepared by the impregnation method in the above patents has a smaller particle size , the heat transfer efficiency can be improved by selecting a high heat transfer metal catalyst carrier, but for large particle size catalysts, the heat generated by the active component layer of the catalyst cannot be removed in a timely manner only by improving the carrier heat transfer capacity, and for large particle size catalysts The application of diameter catalysts has certain limitations
In addition, the metal as a carrier requires it to be inert to the reaction system, which greatly limits the scope of application of the metal carrier.
[0007] Therefore, it is necessary to manufacture a heteropolyacid catalyst with high methacrolein conversion rate and methacrylic acid selectivity. This heteropolyacid catalyst needs to have good stability against environmental humidity to ensure that the catalyst has high catalytic stability in the reaction process properties, and a high degree of structural stability during production, storage, and filling; at the same time, this heteropolyacid catalyst also needs to have excellent heat transfer efficiency to prevent the catalyst from being easily caused by runaway temperature during a strong exothermic reaction. Problems with decreased reactivity or forced abort of the reaction

Method used

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  • A kind of catalyst for the manufacture of methacrylic acid and its preparation method and application
  • A kind of catalyst for the manufacture of methacrylic acid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Embodiment 1: preparation of active component powder A-C

[0075] Preparation of Active Ingredient Powder A:

[0076] (a) Weigh 706.2g ammonium heptamolybdate, 60.97g vanadium pentoxide, 31.5g cuprous oxide, 633.7g ferric nitrate, 156.4g sodium nitrate, add deionized water 2466.9g and fully mix, weigh 65.7g g 85wt% phosphoric acid was added to the above solution and mixed thoroughly, then refluxed and stirred for 5 hours at pH=1.5, 95°C, and aged to form a slurry with a solid content of 40wt%.

[0077] (b) After the aging is completed, transfer the solution to the inlet of the centrifugal spray dryer, set the spray drying speed to 10000r / min, the inlet temperature to 150°C, and the outlet temperature to 110°C, and spray to obtain active component powder A with an average particle size of 50μm .

[0078] Active component powder A is a heteropolyacid with the following composition:

[0079] Mo12P1.71V2.01Cu1.32Fe7.86Na5.52Ox, x is the value corresponding to the atomic va...

Embodiment 2

[0091] Catalyst preparation:

[0092] (1) Take 100g of active component powder A, mix it with 2.5g of PVP, and add 4g of nano-calcium oxide, take 266.25g of inert ceramic balls, and adjust the spray speed of ethanol in the rotary roller coating machine to realize the mixed powder rotary coating on The surface of the inert ceramic ball is dried at 100°C for 5 hours after molding, and then placed in a mesh bag baking furnace for low-temperature pre-baking to prepare the rotary roll coating A. The pre-baking temperature is 175°C and the time is 5 hours to obtain the coated inner Inert ceramic balls in the shell;

[0093] (2) Take 67.9g of active component powder A, mix it with 3.4g of PVP, and add 1.41g of carbon nanofibers, and adjust the spray speed of ethanol in the rotary roller coating machine to realize the rotary coating of the mixed powder on the coated inner shell The outer surface of the inert ceramic ball is dried at 100°C for 5 hours after molding, and placed in a me...

Embodiment 3

[0096] Catalyst preparation:

[0097] (1) Take 100g of active component powder A, mix it with 1g of PVP, and add 2.86g of nano-magnesium oxide, take 385.8g of inert ceramic balls, and adjust the spray speed of ethanol in the rotary roller coating machine to realize the mixed powder rotary coating on The surface of the inert ceramic ball is dried at 90°C for 4 hours after molding, and then placed in a mesh bag baking furnace for low-temperature pre-baking to prepare the rotary roll coating A. The pre-baking temperature is 150°C and the time is 3 hours, and the coated inner Inert ceramic balls in the shell;

[0098] (2) Take 101.0g of active component powder C, mix it with 5.05g of lignin, and add 1.84g of carbon nanotubes, and adjust the spray speed of ethanol in the rotary roller coating machine to realize the rotary coating of the mixed powder in the coating The outer surface of the inert ceramic ball of the shell layer is dried at 90°C for 4 hours after molding, and then pl...

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Abstract

The invention provides a catalyst for the production of methacrylic acid and its preparation method and application. The catalyst has a double-shell core-shell structure; the inner shell layer contains active components and water-absorbing metal oxides, and the outer shell layer contains active components And inorganic carbon materials, the inner core is inert ceramic balls. The catalyst builds a double-layered structure through secondary spin-roll coating, which can effectively solve the problem that the activity of the heteropolyacid catalyst is easily weakened due to moisture absorption during production, transportation, storage, and loading; on the other hand, it can effectively avoid During the strong exothermic reaction process, the reaction activity of the catalyst is easily reduced or the reaction is forced to stop due to overheating; in addition, the heteropolyacid catalyst of the present invention has good pressure resistance and wear resistance while maintaining excellent catalytic activity The strength can effectively resist the stress brought by the bed pressure and reduce the impact wear caused by the air flow during the reaction process, prolonging the service life of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of methacrylic acid preparation, and relates to a high-efficiency catalyst for producing methacrylic acid and a preparation process thereof, and a method for preparing methacrylic acid by using the same. The method can be used in an atmosphere containing molecular oxygen, in Under the catalysis of the catalyst, the methacrolein is further catalyzed and oxidized to prepare methacrylic acid. Background technique [0002] As an important intermediate in organic chemical raw materials and polymers, methacrylic acid is widely used in the manufacture of coatings, insulating materials, adhesives and ion exchange resins. In addition, methyl methacrylate derived from it is An important intermediate for the production of plexiglass. Nowadays, the large-scale application of methacrylic acid production technology is mainly the acetone cyanohydrin method and the isobutylene method. Compared with the acetone cyanohydrin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/19B01J27/199B01J35/00B01J35/08B01J37/02C07C51/25C07C57/055
CPCB01J37/0244B01J27/19B01J27/199C07C51/252B01J35/397B01J35/51C07C57/04
Inventor 纪勇强胡进刘春东易光铨万毅于海彬杨志超孙康黎源
Owner WANHUA CHEM GRP CO LTD