Catalyst for preparing isophorone by acetone condensation method

The technology of isophorone and catalyst is applied in the field of preparing isophorone, which can solve the problems of low isophorone selectivity of acetone conversion rate, complicated catalyst preparation, difficult process control and the like, and achieve the effect of improving selectivity

Inactive Publication Date: 2010-04-28
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method catalyst is complicated to prepare, and technical process is also comparatively difficult to control, and the conversion rate of acetone and the selectivity of isophorone when being used for isophorone production are only 38% and 51% respectively

Method used

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  • Catalyst for preparing isophorone by acetone condensation method
  • Catalyst for preparing isophorone by acetone condensation method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Preparation of the catalyst: accurately weigh 15.0g of lanthanum oxide, 15.0g of calcium oxide, 90.0g of magnesium oxide, 174.0g of alumina, 3.0g of barium oxide and 3.0g of zirconia, add appropriate amount of water, mix thoroughly with a kneader, and press Shaped and calcined at 500°C for 6 hours to obtain the catalyst, in which the mass percentages of aluminum, magnesium, calcium, barium, zirconium and lanthanum are 30.7%, 18%, and 3.6%, respectively. , 0.83%, 0.74%, 2%.

[0018] Preparation of isophorone: After vaporizing acetone, it was sent to a fixed-bed reactor equipped with the catalyst described in this example to react at 300°C for 26.4 hours. The resulting reaction product was first separated by an acetone recovery tower to separate unreacted acetone Then, the by-product mesityl oxide is separated through the mesityl oxide separation tower, and finally isophorone is separated through the isophorone separation tower. The specific process flow is as follows ( fig...

example 2

[0021] Preparation of the catalyst: accurately weigh the mass ratio of alumina and magnesia to 3:1, 249g of alumina-magnesia pellets with a diameter of 3-6mm, and add them to 75.0mg / ml of calcium nitrate and 37.5mg / ml of cerium nitrate , Barium nitrate 37.5mg / ml and zirconium oxychloride 22.5mg / ml mixed salt solution 400ml immersed in 400ml for 24 hours, evaporated, dried, and calcined at 550℃ for 6 hours to obtain the catalyst, in which aluminum element and magnesium element The mass percentages of, calcium, barium, zirconium and cerium are 35%, 13.3%, 2.6%, 2.3%, 2.2%, 1.6%.

[0022] Preparation of isophorone: After vaporizing acetone, it is sent to a fixed-bed reactor equipped with the catalyst of the present invention to react at 300°C for 26.4 hours. The resulting reaction product is first passed through an acetone recovery tower to separate unreacted acetone, and then The mesityl oxide separation tower separates the by-product mesityl oxide, and finally the isophorone separ...

example 3

[0025] Preparation of the catalyst: accurately weigh 15.0g of calcium oxide, 90.0g of magnesium oxide, 174.0g of alumina, 3.0g of barium oxide and 3.0g of zirconium dioxide, add appropriate amount of water, mix thoroughly with a kneader, and extrude. Immerse in 400ml of mixed solution containing 15.0mg / ml of yttrium nitrate and 25.0mg / ml of lanthanum nitrate for 20 hours, evaporate, dry, and then calcinate at 500°C for 5 hours to obtain the catalyst, in which aluminum element, magnesium element, The mass percentages of calcium element, barium element, zirconium element, yttrium element and lanthanum element are 30%, 17.6%, 3.5%, 0.83%, 0.74%, 0.94%, 2.1% in order.

[0026] Preparation of isophorone: After vaporizing acetone, it is sent to a fixed-bed reactor equipped with the catalyst of the present invention to react at 300°C for 26.4 hours. The resulting reaction product is first passed through an acetone recovery tower to separate unreacted acetone, and then The mesityl oxide ...

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Abstract

The invention provides a catalyst for preparing isophorone by acetone condensation method. The catalyst is sinter formed by the step that magnesium oxide or nitrate, calcium oxide or nitrate, barium oxide or nitrate, zirconium oxide or nitrate, rare earth metal oxide or nitrate and aluminium oxide are mixed and then sintered at 400-600 DEG C for 4-6 hours. The sinter contains 25.4-46.4% of aluminium element, 3-18% of magnesium element, 1.4-7.1% of calcium element, 0.8-4.2% of barium element, 0.7-1.5% of zirconium element and 0.5-6% of rare earth metal element; wherein the rare earth metal is one or two of lanthanum, cerium and yttrium. The catalyst is used for catalyzing acetone condensation reaction, can effectively improve acetone conversion and selectivity of isophorone and causes the acetone conversion and selectivity of isophorone to respectively reach more than 86% and 65%.

Description

Technical field [0001] The invention relates to the field of organic chemical engineering, in particular to a method for preparing isophorone. Background technique [0002] Isophorone, also known as 3,5,5-trimethyl-2-cyclohexen-1-one, is a ketone solvent with high boiling point, low hygroscopicity, weak volatilization speed and high solubility. It is also an important organic chemical raw material. Its derivative isophorone diisocyanate is widely used in the production of polyurethane coatings. The 3,3,5-trimethylcyclohexanol produced by hydrogenation of isophorone is used for the preparation of pharmaceutical rings. The intermediates of mandelic ester and hormones. Trimethyladipate prepared from isophorone is an important intermediate for the synthesis of new plasticizers, lubricants, dinitriles, diamines and glycols. [0003] At present, the preparation methods of isophorone mainly include the acetone condensation method, the mesityl oxide method and the diacetone alcohol method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/02B01J21/06B01J37/08C07C49/603C07C45/74
Inventor 刘自力李辉
Owner GUANGZHOU UNIVERSITY
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