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Aldol condensation catalyst composition, preparation method thereof, and method for preparing methyl methacrylate by using aldol condensation catalyst composition

An aldol condensation and catalyst technology, applied in the field of aldol condensation catalysts, can solve the problems of short life, easy coking and carbon deposition, poor catalyst stability, etc., and achieve high utilization rate, strong anti-coking ability, high reactivity and The effect of stability

Pending Publication Date: 2021-12-07
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] An object of the present disclosure is to provide an aldol condensation catalyst composition to solve the problem that the existing catalysts for the aldol condensation of methyl propionate and formaldehyde are extremely prone to coking and carbon deposition, resulting in poor catalyst stability and short service life

Method used

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  • Aldol condensation catalyst composition, preparation method thereof, and method for preparing methyl methacrylate by using aldol condensation catalyst composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Weigh 8.8282g Ce(NO 3 ) 3 ·6H 2 O and 3.0487g Zr(NO 3 ) 4 ·5H 2 O was dissolved in 95ml deionized water, after fully dissolved, weigh 100g SiO 2 The carrier is vacuum-impregnated in the above mixed solution with a vacuum degree of 0.09MPa. After vacuum impregnation for 0.5h, transfer to an oven at 20°C and dry for 8h, then raise the temperature to 60°C and continue drying for 4h, and then bake at 550°C in an air atmosphere. 5h gave solid (I).

[0069] Weigh 4.9029g Cs 2 CO 3 , dissolved in 90ml of deionized water, vacuum-impregnated the solid (I) in the active component solution at a vacuum degree of 0.09MPa, after immersion for 0.5h, transferred to an oven at 20°C and dried for 8h, then heated to 60°C to continue Drying for 4h gave solid (II).

[0070] Then weigh 3.6772g Cs 2 CO 3 , according to the first load Cs 2 CO 3 method, the solid (Ⅲ) was obtained.

[0071] Then weigh 2.4514g Cs 2 CO 3 , according to the first load Cs 2 CO 3 method to obtain so...

Embodiment 2

[0076] Weigh 8.8282g Ce(NO 3 ) 3 ·6H 2 O, dissolved in 95ml deionized water, weighed 0.7544g BiCl 3 , dissolved in 5ml concentrated HNO 3 solution, after the two solutions were fully mixed and stirred evenly, the fresh catalyst 10Cs-Ce-Bi / SiO was prepared according to the method and steps in Example 1 2 .

[0077] In a fixed bed reactor, methyl propionate: formaldehyde: methanol molar ratio 5:1:7.5, liquid hourly space velocity 4.0h -1 , 330 ° C conditions, the preparation of methyl methacrylate. After 10 hours of reaction, the one-way conversion rate of methyl propionate was 23.26%, and the selectivity of methyl methacrylate was 92.09%. After 200 hours of reaction, the catalyst sample was analyzed for C element, and the C content was measured to be 4.74wt%.

Embodiment 3

[0079] Weigh 8.8282g Ce(NO 3 ) 3 ·6H 2 O and 0.3208g La(NO 3 ) 3 ·6H 2 O was dissolved in 95ml deionized water, and after fully dissolving, a fresh catalyst 10Cs-Ce-La / SiO was prepared according to the method in Example 1 2 .

[0080] In a fixed bed reactor, methyl propionate: formaldehyde: methanol molar ratio 5:1:7.5, liquid hourly space velocity 4.0h -1 , 330 ° C conditions, the preparation of methyl methacrylate. After 10 hours of reaction, the one-way conversion rate of methyl propionate was 24.20%, and the selectivity of methyl methacrylate was 91.19%. After 200 hours of reaction, the catalyst sample was analyzed for C element, and the C content was measured to be 5.11wt%.

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Abstract

The invention relates to an aldol condensation catalyst composition, a preparation method thereof and a method for preparing methyl methacrylate by using the aldol condensation catalyst composition. The aldol condensation catalyst composition comprises an active component, an auxiliary agent, a polymerization inhibitor and a carrier, the carrier is SiO2, the active component is silicate of Cs, the auxiliary agent is oxide of Ce, and the polymerization inhibitor is selected from one or more of oxides of Bi, Zr, La, Cu, Mn and Fe, preferably copper oxide. According to the aldol condensation catalyst composition disclosed by the invention, polymerization of double-bond substances in a reaction system is inhibited, and the coking and carbonization rate of the surface of the catalyst is obviously reduced, so that the coking and carbon deposition resistance of the catalyst is improved, and the one-way service life of the catalyst is prolonged.

Description

technical field [0001] The invention belongs to the technical field of aldol condensation catalysts, and in particular relates to an aldol condensation catalyst composition, a preparation method thereof and a method for preparing methyl methacrylate using the composition. Background technique [0002] Methyl methacrylate is mainly used to produce polymethyl methacrylate (PMMA) and acrylic resin materials, and can also be used to make resins, plastics, coatings, adhesives, lubricants, sizing agents, glazing agents, and insulating potting Materials and medical functional polymer materials, etc., are an important organic chemical raw material. [0003] At present, the main routes for the production of methyl methacrylate (MMA) at home and abroad are the acetone cyanohydrin method and the isobutylene method. Lucite has improved the process and proposed an α-process with no highly toxic substances involved in the production process, no large by-products, environmental friendline...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/10C07C67/343C07C69/54
CPCB01J23/83B01J23/10C07C67/343C07C69/54
Inventor 邵晶晶王耀红苏思正周帅林党伟荣陈西波
Owner BEIJING RISUN TECH CO LTD
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