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Preparation method of catalyst for producing methyl methacrylate and application thereof

A methyl methacrylate and catalyst technology, which is applied in chemical instruments and methods, aldehyde redox preparation, physical/chemical process catalysts, etc., can solve the problem of unsatisfactory methacrolein MMA selectivity, harsh catalytic conditions, and impact on products Quality and other issues, to achieve the effect of a wide range of options, convenient operation, and low load

Active Publication Date: 2019-02-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this catalyst catalyzes that methacrolein is converted into MMA reaction, and catalytic condition is harsh, and the conversion rate of methacrolein and the selectivity of MMA are not ideal enough, especially in the industrial scale-up test, the selectivity to MMA is not high, affects product quality

Method used

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  • Preparation method of catalyst for producing methyl methacrylate and application thereof
  • Preparation method of catalyst for producing methyl methacrylate and application thereof
  • Preparation method of catalyst for producing methyl methacrylate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation and molding conditions of the carrier are the same as in Comparative Example 1.

[0031] Under stirring condition, 250g chloroauric acid and 250g sodium citrate and 60L deionized water are fully mixed to obtain stable, uniform and single gold sol with a higher dispersion state, and 260g polyvinylpyrrolidone (PVP, PVP, Molecular weight 8000-10000), then add 935g lanthanum nitrate, 1170g copper nitrate successively, add 30kg above-mentioned prepared SiO after completely dissolving 2 -Al 2 o 3 -MgO powder, continue to stir and slowly raise the temperature to 75°C, continue to stir at this temperature for 14h and then cool down to room temperature, pour out the upper layer liquid after standing, wash the lower layer of precipitate with deionized water until no chloride ions are detected in the solution, 100°C After drying for 24 hours, bake in air at 300°C for 24 hours to obtain the catalyst Cu-La-Au / SiO 2 -Al 2 o 3 -MgO. The mass percentages of La, Ce...

Embodiment 2

[0033] The carrier molding conditions are the same as in Comparative Example 1, wherein magnesium nitrate is replaced by rubidium nitrate, and spherical SiO with a particle size of about 70 μm is obtained. 2 -Al 2 o 3 - RbO powder, and then roast the powder at 700° C. in an air atmosphere for 6 hours, and cool it down to room temperature for use.

[0034] Catalyst preparation condition is the same as embodiment 1, obtains catalyst Cu-La-Au / SiO 2 -Al 2 o 3 -RbO, wherein the mass percentages of La, Ce, and Au in the catalyst are 1%, 1%, and 0.48%, respectively.

[0035] like figure 1 , is the electron micrograph of the catalyst prepared in this example. It can be seen from the figure that the particles of Au are uniform, highly dispersed on the surface of the carrier, and the particle size is 2nm; the particles of La and Ce are slightly larger than Au, but uniformly distributed, and the particle size is Around 4nm.

Embodiment 3

[0037] The carrier molding conditions are the same as in Comparative Example 1, wherein magnesium nitrate is replaced with cesium nitrate to obtain spherical SiO with a particle size of about 70 μm 2 -Al 2 o 3 -CsO powder, and then calcined the powder at 700° C. in an air atmosphere for 6 hours, and cooled it down to room temperature for use.

[0038] Catalyst preparation condition is the same as embodiment 1, obtains catalyst Cu-La-Au / SiO 2 -Al 2 o 3 -CsO, wherein the mass percentages of Cu, La, and Au in the catalyst are 1%, 1%, and 0.48%, respectively.

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Abstract

The invention discloses a preparation method for a catalyst for producing methyl methacrylate. The preparation method comprises the following steps: fully mixing a gold precursor with a reducing agentand deionized water under stirring by adopting a a macromolecular protection method, so as to obtain stable and uniformly single gold sol in a higher dispersion state; sequentially adding a lanthanide metal and a transition metal in the presence of a macromolecular protection agent, then adding a carrier, continuously stirring for 2 to 20 hours, slowly heating the mixture to 65 to 85 DEG C, cooling the product to room temperature after the stirring is ended, leaving to stand for filtration, washing the product with the deionized water till no chloride ions are detected, drying the product, and calcining the product in air to obtain the catalyst. The catalyst has outstanding performance in the reaction for producing the methyl methacrylate. According to the preparation method, the gold carrying amount is low; the preparation process is simple and easy to operate; the catalyst is excellent in activity, extremely high in stability and low in cost; the methylacrolein conversion rate and the MMA (methyl methacrylate) selectivity are high; the preparation method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method and application of a catalyst for producing methyl methacrylate. Background technique [0002] Methyl methacrylate (methyl methacrylate, MMA) is an important organic chemical raw material. It is a colorless, transparent liquid with an ether fragrance at room temperature. In the past, MMA was mainly produced by the acetone cyanohydrin method in industry. One-step preparation of MMA from methacrolein is a green process route with great development potential, because there is no generation of methacrylic acid in the middle, and there is no subsequent esterification process of methacrylic acid and methanol, which will greatly save production costs , and the by-product of the process is water, which is green and environmentally friendly. But the difficulty of this process lies in the preparation of the catalyst, therefore, people have pai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/68C07C67/44C07C69/54
CPCB01J23/002B01J23/685B01J23/688B01J23/8946B01J2523/00C07C67/44C07C69/54B01J2523/14B01J2523/31B01J2523/41B01J2523/15B01J2523/24B01J2523/22
Inventor 黄家辉吕强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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