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Solid catalyst used in acetone self-condensation reaction, and preparation method and application thereof

A solid catalyst, self-condensation technology, used in the preparation of organic compounds, carbon-based compounds, chemical instruments and methods, etc. Bonding, improving activity and selectivity, uniform dispersion effect

Active Publication Date: 2015-09-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the above-mentioned catalyst preparation methods reported in recent years are powdered catalysts prepared by coprecipitation method, and the catalyst strength is poor, and because the preparation conditions of coprecipitation method are harsh, the reproducibility of catalyst preparation is poor, so it is difficult to meet the requirements of large quantities. Requirements for large-scale industrial plant applications

Method used

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  • Solid catalyst used in acetone self-condensation reaction, and preparation method and application thereof
  • Solid catalyst used in acetone self-condensation reaction, and preparation method and application thereof
  • Solid catalyst used in acetone self-condensation reaction, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, the catalyst precursor is prepared by co-precipitation method, and then the solid catalyst is prepared by wet kneading, such as figure 1 As shown, the specific process of the preparation method is as follows:

[0035] 1. Preparation of mixed salt solution:

[0036] Weigh 666.7g Mg(NO 3 ) 2 ·6H 2 O and 322.2g Al(NO 3 ) 3 9H 2 O crystals, add deionized water, stir to dissolve the salt completely, and prepare a 1000ml mixed salt solution;

[0037] 2. Preparation of alkaline solution:

[0038] Take a certain amount of sodium hydroxide, dissolve it in deionized water, and prepare a NaOH solution with a concentration of 3.8mol / L, then weigh a certain amount of sodium carbonate, dissolve it in deionized water, and prepare a NaOH solution with a concentration of 1.0mol / L. 2 CO 3 solution.

[0039] 3. Preparation of magnesium aluminum hydrotalcite:

[0040] Add 500ml deionized water into the reaction kettle, after heating to 60°C, mix salt solution an...

Embodiment 2

[0048] In this example, the catalyst precursor is prepared by the co-precipitation method, and then the solid catalyst is prepared by wet kneading. The specific process is as follows:

[0049] 1. Preparation of mixed salt solution:

[0050] Weigh 650.5g Mg(NO 3 ) 2 ·6H 2 O and 310.2g Al(NO 3 ) 3 9H 2 O crystals, add deionized water, stir to dissolve the salt completely, and prepare a 1000ml mixed salt solution;

[0051] 2. Preparation of alkaline solution:

[0052] Take a certain amount of sodium hydroxide, dissolve it in deionized water, and prepare a NaOH solution with a concentration of 3.8mol / L, then weigh a certain amount of sodium carbonate, dissolve it in deionized water, and prepare a NaOH solution with a concentration of 1.0mol / L. 2 CO 3 solution.

[0053] 3. Preparation of magnesium aluminum hydrotalcite:

[0054] Add 500ml deionized water into the reaction kettle, after heating to 65°C, mix salt solution and alkali solution (NaOH solution and NaOH solution...

Embodiment 3

[0060] In this example, the catalyst precursor is prepared by the co-precipitation method, and then the solid catalyst is prepared by wet kneading. The specific process is as follows:

[0061] 1. Preparation of mixed salt solution:

[0062] Weigh 700.4g Mg(NO 3 ) 2 ·6H 2 O and 352.1g Al(NO 3 ) 3 9H 2 O crystals, add deionized water, stir to dissolve the salt completely, and prepare a 1000ml mixed salt solution;

[0063] 2. Preparation of alkaline solution:

[0064] Take a certain amount of sodium hydroxide, dissolve it in deionized water, and prepare a NaOH solution with a concentration of 3.8mol / L, then weigh a certain amount of sodium carbonate, dissolve it in deionized water, and prepare a NaOH solution with a concentration of 1.0mol / L. 2 CO 3 solution.

[0065] 3. Preparation of magnesium aluminum hydrotalcite:

[0066] Add 500ml deionized water into the reaction kettle, after heating to 50°C, mix salt solution and alkali solution (NaOH solution and NaOH solution...

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Abstract

The invention discloses a solid catalyst used in an acetone self-condensation reaction, and a preparation method and an application thereof. The invention relates to the technical field of acetone self-condensation catalysts. According to the invention, magnesium-aluminum hydrotalciteis first prepared with a co-precipitation method, and is adopted as a catalyst precursor; the catalyst precursor is well mixed with a rare earth component and an organic dispersing agent; the mixture is formed by wet kneading and extrusion; and roasting is carried out, such that the solid catalyst is obtained. A fixed bed continuous reaction device is adopted, and the catalyst is applied in an acetone self-condensation reaction. A reaction temperature is 100-450 DEG C, a reaction pressure is 0.1-2.0MPa, the liquid hourly space velocity is 0.1-5h<-1>, an acetone single-pass conversion rate is 20-50%, and an effective selectivity (mesityl oxide+isophorone) is 90-99%, wherein an isophorone selectivity is higher than 70%. The catalyst has acid-alkali dual active center on the surface, and can be flexibly modulated. The catalyst has good activity and stability.

Description

technical field [0001] The invention relates to the technical field of catalysts for acetone self-condensation reaction, in particular to a solid catalyst for acetone self-condensation reaction and its preparation method and application. Background technique [0002] Acetone, also known as dimethyl ketone, is the simplest ketone in the series of saturated aliphatic ketones. Melting point -95°C, boiling point 56°C, colorless liquid with special smell, can dissolve acetic acid and nitrocellulose. The carbonyl group of acetone can undergo addition reactions with various nucleophiles, such as catalytic hydrogenation to generate isopropanol, reduction to generate pinacol; reactions with ammonia derivatives, hydrocyanic acid, acetylenides, organometallic compounds, etc.; acetone also It can carry out α-H reactions, such as substitution reactions with halogens, aldol condensation reactions with itself or with other compounds, etc. Among them, the self-condensation reaction produc...

Claims

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Application Information

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IPC IPC(8): B01J23/10C07C49/603C07C45/74
Inventor 王芳珠柴永明刘晨光李丹盈叶涛牟庆平刘振学姚刚栾波
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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