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A modified magnesium-aluminum composite oxide catalyst for acetone condensation and its preparation method and application

A composite oxide and catalyst technology, which is applied in the preparation of carbon-based compounds, organic compounds, physical/chemical process catalysts, etc., can solve the problems of isophorone to be improved, and achieve good order and complete morphology , the effect of regular structure

Active Publication Date: 2017-12-12
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing magnesium-aluminum composite oxide catalysts still need to be improved in the conversion rate of acetone and the selectivity to isophorone

Method used

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  • A modified magnesium-aluminum composite oxide catalyst for acetone condensation and its preparation method and application
  • A modified magnesium-aluminum composite oxide catalyst for acetone condensation and its preparation method and application
  • A modified magnesium-aluminum composite oxide catalyst for acetone condensation and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Alkaline solution preparation: Weigh 35.4g NaOH and 20.1g NaOH respectively 2 CO 3 Put it into a beaker, add an appropriate amount of double distilled water, stir to make NaOH, Na 2 CO 3 Dissolve completely and prepare 350ml alkali solution.

[0038] 2. Salt solution preparation: weigh 72.1g Mg(NO 3 ) 2 ·6H 2 O, 52.8g Al(NO 3 ) 3 9H 2 O, 24.5gCe(NO 3 ) 3 ·6H 2 O and 36.6g La(NO 3 ) 3 ·6H 2 O crystals were put into a beaker, an appropriate amount of twice distilled water was added, and stirred to completely dissolve the crystals, and a 350ml salt solution was prepared.

[0039] 3. Hydrotalcite preparation: put the flask into a constant temperature water bath and fix it on an iron stand, and add 300ml of deionized water into the flask. Adjust the temperature of the constant temperature water bath to 60°C, and start the stirrer. The salt solution and the alkali solution are fed into the flask in parallel by adopting a double-drop feeding method, and the ...

Embodiment 2

[0042] 1. Alkaline solution preparation: Weigh 34.8g NaOH and 20.1g NaOH respectively 2 CO 2 Put it into a beaker, add an appropriate amount of double distilled water, stir to make NaOH, Na 2 CO 3 Dissolve completely and prepare 350ml alkali solution.

[0043] 2. Salt solution preparation: weigh 72.4g Mg(NO 3 ) 2 ·6H 2 O, 52.3g Al(NO 3 ) 3 9H 2 O, 21.7g Y (NO 3 ) 3 ·6H 2 O and 24.2g Ce(NO 3 ) 3 ·6H 2 O crystals were put into a beaker, an appropriate amount of twice distilled water was added, and stirred to completely dissolve the crystals, and a 350ml salt solution was prepared.

[0044] 3. Hydrotalcite preparation: put the flask into a constant temperature water bath and fix it on an iron stand, and add 300ml of deionized water into the flask. Adjust the temperature of the constant temperature water bath to 75°C, and start the stirrer. The salt solution and the alkali solution are fed into the flask in parallel by adopting a double-drop feeding method, and the...

Embodiment 3

[0048] 1. Alkaline solution preparation: Weigh 36.4g NaOH and 20.7g NaOH respectively 2 CO 3 Put it into a beaker, add an appropriate amount of double distilled water, stir to make NaOH, Na 2 CO 3Dissolve completely and prepare 350ml alkali solution.

[0049] 2. Salt solution preparation: weigh 72.1g Mg(NO 3 ) 2 ·6H 2 O, 52.8g Al(NO 3 ) 3 9H 2 O, 24.5gCe(NO 3 ) 3 ·6H 2 O and 36.6g La(NO 3 ) 3 ·6H 2 O crystals were put into a beaker, an appropriate amount of twice distilled water was added, and stirred to completely dissolve the crystals, and a 350ml salt solution was prepared.

[0050] 3. Hydrotalcite preparation: put the flask into a constant temperature water bath and fix it on an iron stand, and add 300ml of deionized water into the flask. Adjust the temperature of the constant temperature water bath to 65°C, and start the stirrer. The salt solution and the alkali solution are fed into the flask in parallel by adopting a double-drop feeding method, and the p...

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Abstract

The invention discloses a modified magnesium-aluminum composite oxide catalyst for acetone condensation, a preparation method and application thereof, and belongs to the technical field of acetone condensation. In the catalyst, the modified hydrotalcite is prepared by using a precipitant and a metal salt solution containing a rare earth element by a double-drop co-current co-precipitation method, and the modified magnesium-aluminum composite oxide catalyst is obtained after roasting. The catalyst is modified with rare earth components (La and Ce or Y and Ce) to modify the magnesium-aluminum composite oxide to effectively adjust the acid-base density and strength ratio of the catalyst surface, thereby improving its catalytic acetone self-condensation reaction activity and isotropic reaction. Selectivity of pherone. The modified catalyst achieves a single pass conversion rate of acetone of 35-42%, and a selectivity to isophorone of 72%-76%.

Description

technical field [0001] The invention relates to the technical field of acetone condensation, in particular to a modified magnesium-aluminum composite oxide catalyst for acetone condensation and its preparation method and application. Background technique [0002] Isophorone (CAS RN 78-59-1, Isophorone), Chinese aliases: Isophorone, 3,5,5-trimethyl-2-cyclohexenone, is the first generation derivative in acetone chemistry substance, its chemical name is 3,5,5-trimethyl-2-cyclohexen-1-one, and its molecular formula is C 9 h 14 O, the relative molecular mass is 138.21, the appearance is colorless or water white to yellow low volatility liquid, flammable, with mint or camphor-like smell. Isophorone is an excellent high-boiling solvent with good solubility, dispersibility and leveling property. It is slightly soluble in water, soluble in alcohol, ether and acetone, and easily soluble in most organic solvents. It is the preferred choice in the fine chemical industry As an importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/10B01J23/10B01J35/10C07C49/603C07C45/74
Inventor 王芳珠柴永明牟庆平刘晨光姚刚栾波吕灵灵李丹盈
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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