Catalyst to produce methyl methacrylate efficiently at low cost and preparation method of catalyst

A technology of methyl methacrylate and catalyst, which is applied in the direction of catalyst activation/preparation, carboxylate preparation, chemical instruments and methods, etc., which can solve the problem of unsatisfactory methacrolein MMA selectivity, high catalyst cost and affecting product quality and other problems, to achieve the effect of wide selection range, simple preparation process and low price

Active Publication Date: 2019-03-01
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 selecti

Method used

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  • Catalyst to produce methyl methacrylate efficiently at low cost and preparation method of catalyst
  • Catalyst to produce methyl methacrylate efficiently at low cost and preparation method of catalyst

Examples

Experimental program
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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 of a catalyst to produce methyl methacrylate efficiently at low cost. The catalyst is made by a polymeric protection process and is a supported catalyst with an active center supported on a support; the active center includes gold and a rare-earth metal; the support is one of SiO2, SiO2-Al2O3, CaCO3, carbon material, and molecular sieve material; the catalyst is 0.05-0.98% by weight in gold loading capacity and 1-2.5% by weight in rare-earth metal loading capacity. The preparation method is suitable for preparing a gold particulate catalyst having uniform particle size and high activity; the preparation process is simple; the preparation method is convenient to perform; active component loading capacity is low; the catalyst has excellent activity and good stability; the catalyst is prepared at low cost; methylacrolein conversion rate and 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 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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IPC IPC(8): B01J23/66B01J35/08B01J37/16B01J37/08C07C69/54C07C67/00
CPCB01J23/002B01J23/66B01J35/0013B01J35/006B01J35/0093B01J35/08B01J37/0018B01J37/16B01J2523/00C07C67/00B01J2523/22B01J2523/31B01J2523/41B01J2523/14B01J2523/15B01J2523/24C07C69/54
Inventor 黄家辉吕强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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