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Acid-base bifunctional catalyst for synthesizing methyl acrylate from methyl acetate and formaldehyde and preparation method of acid-base bifunctional catalyst

The technology of methyl acrylate and methyl acetate is applied in the field of acid-base bifunctional catalyst and preparation, can solve the problems of low conversion rate and selectivity, low catalyst activity, short regeneration period and the like, achieves simple preparation method and improved specific surface area , the effect of reducing carbon deposition

Pending Publication Date: 2021-05-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems that need to be solved urgently, such as low catalyst activity, low conversion rate and selectivity, serious carbon deposition, short regeneration cycle, and poor economic benefits.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, 8% of the active component cesium and 3% of the active component aluminum are loaded on a silica carrier, and the specific preparation method is as follows:

[0024] (1) Weigh 20g of a silica carrier with a pore diameter of 7.6nm, wash it with deionized water for 0.5h, put it in a drying oven at 120°C and dry it for 12h; then bake it in a muffle furnace at a rate of 10°C / min at 400°C 4h;

[0025] (2) Accurately weigh 4.42g aluminum nitrate, add a certain amount of deionized water and fully dissolve to obtain an aqueous solution containing aluminum;

[0026] (3) adding the silicon oxide carrier obtained in step (1) to the solution in step (2), stirring for 0.5 h, then standing for 12 h, and then drying at 120° C. for 12 h;

[0027] (4) Put the catalyst precursor obtained in step (3) into a muffle furnace, heat up to 500° C. at a rate of 10° C. / min, roast for 4 hours, and obtain an aluminum-loaded catalyst after cooling;

[0028] (5) Accurately weigh...

Embodiment 2

[0033] In this example, 8% of the active component cesium and 3% of the active component aluminum are loaded on a silica carrier, and the specific preparation method is as follows:

[0034] (1) Weigh 20g of a silica carrier with a pore diameter of 7.6nm, wash it with deionized water for 0.5h, put it in a drying oven at 120°C and dry it for 12h; then bake it in a muffle furnace at a rate of 10°C / min at 400°C 4h;

[0035] (2) Weigh 4.42g aluminum nitrate, add a certain amount of deionized water and fully dissolve to obtain an aqueous solution containing aluminum;

[0036] (3) Add the silicon oxide carrier obtained in step (1) to the solution in step (2), stir for 0.5 h, let stand for 12 h, and then dry at 120° C. for 12 h;

[0037] (4) Put the catalyst precursor obtained in step (3) into a muffle furnace, heat up to 500° C. at a rate of 10° C. / min, roast for 4 hours, and obtain an aluminum-loaded catalyst after cooling;

[0038] (5) Accurately weigh 1.85g cesium carbonate, add...

Embodiment 3

[0043]In this example, 8% of the active component cesium and 3% of the active component aluminum are loaded on a silica carrier, and the specific preparation method is as follows:

[0044] (1) Weigh 20g of a silica carrier with a pore diameter of 7.6nm, wash it with deionized water for 0.5h, put it in a drying oven at 120°C and dry it for 12h; then bake it in a muffle furnace at a rate of 10°C / min at 400°C 4h;

[0045] (2) Accurately weigh 1.57g aluminum chloride, add a certain amount of deionized water and fully dissolve to obtain an aqueous solution containing aluminum;

[0046] (3) Add the silicon oxide carrier obtained in step (1) to the solution in step (2), stir for 0.5 h, let stand for 12 h, and then dry at 120° C. for 12 h;

[0047] (4) Put the catalyst precursor obtained in step (3) into a muffle furnace, heat up to 500° C. at a rate of 10° C. / min, roast for 4 hours, and obtain an aluminum-loaded catalyst after cooling;

[0048] (5) Accurately weigh 2.21g cesium nit...

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Abstract

The invention discloses a catalyst for synthesizing methyl acrylate from methyl acetate and formaldehyde and a preparation method of the catalyst. The preparation method mainly comprises the following steps: (1) washing a carrier with water, putting into a drying oven for drying at 120 DEG C, and then roasting in a muffle furnace at 300-500 DEG C for 2-8 hours; and (2) respectively weighing compounds containing active components Al and Cs, preparing into a solution with a certain concentration, fully impregnating the active components for 2-24 hours according to an equivalent-volume impregnation mode, drying at 60-150 DEG C for 4-15 hours, and finally, roasting the components in a muffle furnace at 400-650 DEG C for 2-8 hours to obtain the catalyst. The catalyst provided by the invention is an acid-base bifunctional catalyst, can effectively improve the selectivity and conversion rate of the product, and has high carbon deposition resistance; and the preparation method of the catalyst is simple and easy to implement, and is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to an acid-base bifunctional catalyst for synthesizing methyl acrylate from methyl acetate and formaldehyde and a preparation method thereof, which can be used to catalyze the catalyst for preparing methyl acrylate through aldol condensation of methyl acetate and formaldehyde and the preparation method of the catalyst. Background technique [0002] Methyl acrylate is a widely used and important fine chemical raw material, mainly used as an organic synthesis intermediate and polymer monomer. The polymers synthesized from it are widely used in coatings, textiles, leather, adhesives and other industries. In addition, it also has a wide range of uses in the production of paper, leather, paint, pharmaceuticals and other industries. In recent years, methyl acrylate has been widely used. Although the total production of acrylate in my country is large, the production capacity is too scattered and the technology is not mature enough. Mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/04C07C67/343C07C69/54
CPCB01J23/04C07C67/343C07C69/54
Inventor 张国梁严婷婷李杰常炜张龙水张军平盛贵阳李春山张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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