Method for preparing ketone compounds from acetic acid and ethanol by using two-stage method

A technology of ketone compounds and acetic acid, which is applied in the field of preparation of ketone compounds, can solve the problems of unsustainability and scale limitation, and achieve the effects of good activity and stability, low price and good stability

Active Publication Date: 2019-03-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bioethanol is overwhelmingly based on food crops and is scale-limiting and unsustainable in the long run

Method used

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  • Method for preparing ketone compounds from acetic acid and ethanol by using two-stage method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Catalyst preparation

[0012] CeO 2 The preparation adopts the precipitation method. Weigh 25g of cerium nitrate hexahydrate and dissolve it in 2.5L of water, add ammonia water with a mass concentration of 27% to adjust the pH=11, stir for 4h, filter, dry, and roast at 500°C for 4h to obtain 10g of CeO 2 . CeO 2 -SnO 2 Composite metal oxide adopts co-precipitation method, weighs 25g of cerium nitrate hexahydrate and dissolves it in 2.5L of water, and adds a certain amount of tin chloride, CeO 2 :SnO 2 =5:1 (mass ratio), add ammonia water with a mass concentration of 27% to adjust the pH=11, precipitate appears, continue to stir for 4 hours, centrifuge the obtained precipitate, dry, and roast at 500°C for 4 hours to obtain CeO 2 -SnO 2 Composite metal oxide catalyst.

[0013] Preparation of ketones

[0014] Form and sieve the above two catalysts with 14-25 mesh respectively and fill them into the reaction tube. The first stage filled catalyst is CeO 2 , the he...

Embodiment 2

[0016] Catalyst preparation

[0017] CeO 2 The preparation adopts the precipitation method. Weigh 25g of cerium nitrate hexahydrate and dissolve it in 2.5L of water, add ammonia water with a mass concentration of 27% to adjust the pH=11, stir for 4h, filter, dry, and roast at 500°C for 4h to obtain 10g of CeO 2 . CeO 2 -SnO 2 Composite metal oxide adopts co-precipitation method, weighs 25g of cerium nitrate hexahydrate and dissolves it in 2.5L of water, and adds a certain amount of tin chloride, CeO 2 :SnO 2 =5:1 (mass ratio), add ammonia water to adjust pH=11, precipitate appears, continue to stir for 4 hours, centrifuge the resulting precipitate, dry, and roast at 500°C for 4 hours to obtain CeO 2 -SnO 2 Composite metal oxide catalyst.

[0018] Preparation of ketones

[0019] Form and sieve the above two catalysts with 14-25 mesh respectively and fill them into the reaction tube. The first stage filled catalyst is CeO 2 , the height of the packed bed is 6cm, the r...

Embodiment 3

[0021] Catalyst preparation

[0022] CeO 2 The preparation adopts the precipitation method. Weigh 25g of cerium nitrate hexahydrate and dissolve it in 2.5L of water, add ammonia water with a mass concentration of 27% to adjust the pH=11, stir for 4h, filter, dry, and roast at 500°C for 4h to obtain 10g of CeO 2 . CeO 2 -SnO 2 Composite metal oxide adopts co-precipitation method, weighs 25g of cerium nitrate hexahydrate and dissolves it in 2.5L of water, and adds a certain amount of tin chloride, CeO 2 :SnO 2 =5:1 (mass ratio), add ammonia water to adjust pH=11, precipitate appears, continue to stir for 4 hours, centrifuge the resulting precipitate, dry, and roast at 500°C for 4 hours to obtain CeO 2 -SnO 2 Composite metal oxide catalyst.

[0023] Preparation of ketones

[0024] Form and sieve the above two catalysts with 14-25 mesh respectively and fill them into the reaction tube. The first stage filled catalyst is CeO 2 , the height of the packed bed is 6cm, the r...

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Abstract

The invention relates to a method for preparing ketone compounds. A reaction is carried out at normal pressure in a two-stage fixed bed reactor, a first-stage catalyst is CeO2, a reaction temperatureis 300-450 DEG C, a raw material is acetic acid, and a feeding mass space velocity of the raw material is 0.1-1.0 h<-1>. Acetone is generated after the acetic acid is subjected to a ketonization reaction in the first stage, and then a second-stage reaction is carried out. A second-stage catalyst is CeO2-SnO2, a reaction temperature is 350-450 DEG C, a raw material is ethanol, and a feeding mass space velocity of the raw material is 0.1-1.0 h<-1>. 2-pentanone and 4-heptanone are prepared through dehydrogenation and an Aldol condensation reaction in the second stage. The method is characterizedin that CeO2 and a cerium-based composite oxide are used as catalysts, and the catalyst is simple to prepare and has good stability. The ketone compounds are generated by efficiently catalyzing aceticacid and ethanol through a two-stage method, the conversion rate is up to 35% (based on the total carbon number), and the total selectivity of the ketone compounds can reach 99%, wherein the selectivity of 2-pentanone is 85%, and the selectivity of 4-heptanone is 15%. In the process, acetic acid and ethanol are taken as raw materials, the raw material source is wide, and a potential industrial application prospect is achieved.

Description

technical field [0001] The invention relates to a method for preparing ketone compounds, in particular to a method for preparing ketone compounds by using acetic acid and ethanol as reactants and utilizing a series reaction two-stage method. Background technique [0002] In today's world, with the development of industry, the consumption of fossil fuels is increasing year by year. Due to their non-renewable nature, they are already facing the possibility of resource depletion. Therefore, it has attracted more and more attention as a renewable bioenergy source. Biofermentation is a very important way to obtain chemicals from biomass. Among them, the current industrial production is mainly bio-fermentation ethanol. Bioethanol is overwhelmingly based on food crops, which is scale-limiting and unsustainable in the long run. In recent years, the second-generation bioethanol using lignocellulose as raw material determines that the process of bioethanol as raw material has poten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/00C07C49/08C07C49/04B01J23/10B01J23/14B01J37/08B01J37/03B01J37/10B01J37/02C01F17/00
CPCC07C45/00B01J23/002B01J23/10B01J23/14B01J37/0201B01J37/03B01J37/08B01J37/10C01F17/206C07C49/08C07C49/04
Inventor 王峰王业红张健张志鑫
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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