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A kind of catalyst and preparation method thereof for producing methyl methacrylate with low cost and high efficiency

A technology of methyl methacrylate and catalyst, which is applied in the direction of catalyst activation/preparation, carboxylate preparation, chemical instruments and methods, etc. It can solve the problem of unsatisfactory methacrolein MMA selectivity, affecting product quality, and harsh catalytic conditions and other problems, to achieve the effect of a wide range of options, low price, and enhanced reaction stability

Active Publication Date: 2020-11-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • 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
The active center of MMA series catalysts plays a major role in the noble metal Au, and its high price is the main reason for the high cost of catalysts, which also limits its popularization and application.

Method used

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  • A kind of catalyst and preparation method thereof for producing methyl methacrylate with low cost and high efficiency
  • A kind of catalyst and preparation method thereof for producing methyl methacrylate with low cost and high efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Carrier molding conditions are the same as in Comparative Example 1.

[0033] 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 935g lanthanum nitrate, add 30kg above-mentioned prepared SiO after dissolving completely 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, it was calcined in air at 300°C for 24 hours to obtain the catalyst La-Au / SiO 2 -Al 2 o 3 -MgO. The mass percentages of La and Au in the catalyst are 1% and 0.48% respectively....

Embodiment 2

[0035] 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.

[0036] Catalyst preparation condition is the same as embodiment 1, obtains catalyst La-Au / SiO 2 -Al 2 o 3 -RbO, wherein the mass percentages of La and Au in the catalyst are 1% and 0.48% respectively.

Embodiment 3

[0038] 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.

[0039] Catalyst preparation condition is the same as embodiment 1, obtains catalyst La-Au / SiO 2 -Al 2 o 3 -CsO, wherein the mass percentages of La and Au in the catalyst are 1% and 0.48% respectively.

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Abstract

The invention discloses a preparation method for a low-cost and high-efficiency catalyst for the production of methyl methacrylate. The catalyst is made by a polymer protection method and is a loaded catalyst with an active center loaded on a carrier. The active center includes gold and a Rare earth metal, carrier is SiO 2 ,SiO 2 ‑Al 2 O 3 ,CaCO 3 , carbon materials, and molecular sieve materials; the loading of gold in the catalyst is 0.05wt%-0.98wt%, and the loading of rare earth metals is 1wt%-2.5wt%. The preparation method adopted in the present invention can obtain a gold particle catalyst with uniform particles and high activity. The preparation process is simple, the operation is convenient, the loading of active components is low, and it has excellent activity and good stability. The preparation cost of the catalyst is low. The conversion rate of methacrolein and the selectivity of MMA are high 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 producing methyl methacrylate with low cost and high efficiency and a preparation method 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/66B01J35/08B01J37/16B01J37/08C07C69/54C07C67/00
CPCC07C67/00B01J23/002B01J23/66B01J37/0018B01J37/16B01J2523/00B01J35/393B01J35/23B01J35/399B01J35/51B01J2523/22B01J2523/31B01J2523/41B01J2523/14B01J2523/15B01J2523/24C07C69/54
Inventor 黄家辉吕强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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