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A kind of clean production method of 2,3-octanedione

A clean production, octanedione technology, applied in the oxidation preparation of carbonyl compounds, organic chemistry and other directions, can solve the problems of flammability, environmental pollution, toxic isoamyl nitrite, etc., to achieve "three wastes" less, environmentally friendly, production conditions mild effect

Active Publication Date: 2014-10-15
HENAN HUALONG SPICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional process is to use isoamyl nitrite to react with 2-octanone to generate 3-oxime-2-octanone, which is then hydrolyzed to 2,3-octanedione. The yield is only 47%. Isamyl nitrite is toxic and Flammable, dangerous chemicals such as hydrochloric acid and sulfuric acid are used in the reaction, and a large amount of waste acid water is produced, which seriously pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A clean production method for 2,3-octanedione, comprising the steps of:

[0026] The first step, the preparation of the composite catalyst

[0027] (1) Preparation of component 1: Take 300g of 5-methoxytriazole, 300g of chlorobenzene and 600g of acetonitrile according to a certain proportion, put them in a three-necked flask, heat to reflux, the reflux temperature is 85-95℃, and the reflux time is 10h , to obtain the crude material of component 1, and then the crude material of component 1 is centrifuged, washed and dried to obtain a mass of 396g of component 1, and the component 1 is 5-methoxy-triphenyl-1,2 , 4-triazolium salt;

[0028] (2) Preparation of component 2: Take 300g of 5-methoxythiazole, 300g of benzyl chloride and 600g of acetonitrile in a certain proportion, put them in a three-necked flask, heat to reflux, the reflux temperature is 85-95°C, and the reflux time is 10h. The crude material of component 2 was obtained, and then the crude material of compon...

Embodiment 2

[0037] A clean production method for 2,3-octanedione, comprising the steps of:

[0038] The first step, the preparation of the composite catalyst

[0039] (1) Preparation of component 1: Take 400g of 5-methoxytriazole, 600g of chlorobenzene and 800g of acetonitrile according to a certain proportion, put them in a three-necked flask, heat to reflux, the reflux temperature is 85-95℃, and the reflux time is 10h , to obtain the crude material of component 1, and then the crude material of component 1 is centrifuged, washed and dried to obtain a mass of 542g of component 1, and the component 1 is 5-methoxy-triphenyl-1,2 , 4-triazolium salt;

[0040] (2) Preparation of component 2: Take 300g of 5-methoxythiazole, 300g of benzyl chloride and 600g of acetonitrile in a certain proportion, put them in a three-necked flask, heat to reflux, the reflux temperature is 85-95°C, and the reflux time is 10h. The crude material of component 2 was obtained, and then the crude material of compon...

Embodiment 3

[0049] A clean production method for 2,3-octanedione, comprising the steps of:

[0050] The first step, the preparation of the composite catalyst

[0051] (1) Preparation of component 1: Take 400g of 5-methoxytriazole, 400g of chlorobenzene and 1000g of acetonitrile according to a certain proportion, put them in a three-necked flask, heat to reflux, the reflux temperature is 85-95℃, and the reflux time is 10h , to obtain the crude material of component 1, and then the crude material of component 1 is centrifuged, washed and dried to obtain a mass of 583g of component 1, and the component 1 is 5-methoxy-triphenyl-1,2 , 4-triazolium salt;

[0052] (2) Preparation of component 2: Take 600g of 5-methoxythiazole, 800g of benzyl chloride and 1300g of acetonitrile in a certain proportion, put them in a three-necked flask, heat to reflux, the reflux temperature is 85-95℃, and the reflux time is 10h. The crude material of component 2 was obtained, and then the crude material of compo...

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PUM

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Abstract

The invention relates to a clean production method of 2,3-octanedione, which comprises the steps of preparing a composite catalyst, preparing a Fe3+-Fe2+ redox system, preparing a product from raw materials acetaldehyde and n-hexanal, and the like. The 2,3-octanedione produced by the method has a purity of more than 98 percent, pure aroma, mild production conditions, environmental friendliness, suitability for industrialized production, and good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a clean production method of 2,3-octanedione. Background technique [0002] 2,3-octanedione, CAS: 585-25-1, FEMA: 4060, my country's GB2760-2011 regulations as edible spices, code S0292. Mainly used in coffee, cream, butter and other food flavors and tobacco flavors. [0003] The traditional process is to use isoamyl nitrite to react with 2-octanone to generate 3-oxime-2-octanone, which is then hydrolyzed to 2,3-octanedione. The yield is only 47%. Isamyl nitrite is toxic and It is flammable, and dangerous chemicals such as hydrochloric acid and sulfuric acid are used in the reaction, and a large amount of waste acid water is produced, which seriously pollutes the environment. Contents of the invention [0004] The object of the present invention is to aim at the defects of the prior art, and provide a clean production method of 2,3-octanedione with mil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/29C07C49/14
Inventor 赵军侠文教刚姚彦涛王利霞魏子勇刘付东姜作明郑大刚杨河峰
Owner HENAN HUALONG SPICE
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