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Catalyst for synthesizing methyl methacrylate and preparation method and application thereof

A technology of methyl methacrylate and catalyst, which is applied in the field of catalyst for synthesizing methyl methacrylate and its preparation, can solve problems such as unsatisfactory selectivity, influence on product quality, harsh catalytic conditions, etc., and achieve a wide range of options, Excellent catalytic effect and low production cost

Active Publication Date: 2019-04-05
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

However, the catalyst catalyzes methacrolein into MMA reaction, the catalytic conditions are harsh, and the active center is single, so the conversion rate of methacrolein and the selectivity of MMA are not ideal, especially to the selectivity of MMA in the industrial scale-up test Not high, affecting product quality

Method used

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  • Catalyst for synthesizing methyl methacrylate and preparation method and application thereof
  • Catalyst for synthesizing methyl methacrylate and preparation method and application thereof
  • Catalyst for synthesizing methyl methacrylate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Under stirring conditions, weigh 50kg of silica sol (30wt%), add 9kg of aluminum nitrate during the stirring process, add 7kg of magnesium nitrate after dissolving, mix well at 50°C, add 250ml of concentrated nitric acid to adjust the pH value, continue at 50°C Stir for 24 hours, cool down to room temperature, and then spray dry. The spraying conditions are: 10ml / min feed rate, inlet temperature 200-220°C, outlet temperature 80-100°C, to obtain spherical SiO with a particle size of about 70μm 2 -Al 2 o 3 - MgO powder, and then calcining the powder at 700° C. in an air atmosphere for 6 hours, and cooling it down to room temperature for use.

[0036] Under stirring conditions, 250g chloroauric acid and 275g sodium citrate are fully mixed with 60L deionized water to obtain a stable, uniform and single gold sol with a higher dispersion state, and 280g polyvinylpyrrolidone (PVP, PVP, Molecular weight 8000-10000), then add 940g lanthanum nitrate, 935g cerium nitrate success...

Embodiment 2

[0038] The carrier molding conditions are the same as in Example 1, wherein magnesium nitrate is replaced with rubidium nitrate under the same mass fraction of metal to obtain spherical SiO with a particle size of about 70 μm 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.

[0039] Catalyst preparation condition is the same as embodiment 1, obtains catalyst La-Ce-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.

Embodiment 3

[0041] The carrier molding conditions are the same as in Example 1, wherein magnesium nitrate is replaced with cesium nitrate under the same mass fraction of metal 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.

[0042] Catalyst preparation condition is the same as embodiment 1, obtains catalyst La-Ce-Au / SiO 2 -Al 2 o 3 -CsO, wherein the mass percentages of La, Ce, and Au in the catalyst are 1%, 1%, and 0.48%, respectively.

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Abstract

The invention discloses a preparation method of a catalyst for synthesizing methyl methacrylate. The catalyst is prepared by adopting a high molecular protection method and comprises an active centerand a carrier, the active center comprises gold and two lamthanide-series metals, the carrier comprises one of silicon dioxide, alumina and alkali metal or alkali earth metal, and the alkali metal orthe alkali earth metal exists in the catalyst in an oxide form. The catalyst is low in Au loading capacity, simple in preparation process, convenient in operation, excellent in activity, high in stability, low in cost, high in conversion rate of methylacrolein and selectivity of MMA and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a catalyst for synthesizing methyl methacrylate, a preparation method and application thereof. Background technique [0002] Methyl methacrylate (methyl methacrylate, MMA) is an important organic polymer monomer. Polymethyl methacrylate (PMMA, also known as plexiglass) prepared from it is widely used in national defense industry, construction , transportation, advertising decoration, culture, education and sanitation, instrumentation, daily necessities and other fields; in addition, it also has many applications in water-soluble paints, latex paints, etc. [0003] At present, the production processes of MMA in the world mainly include acetone nitrile alcohol method (ACH method), isobutylene method and ethylene method. In the global MMA production capacity, the acetone cyanohydrin method accounts for 83%, the isobutylene method accounts for 16%, and the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66C07C67/00C07C69/54
CPCB01J23/002B01J23/66C07C67/00C07C69/54
Inventor 黄家辉吕强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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