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Novel method for synthesizing acetyl propionyl

A technology of levulinyl and methyl butanol, applied in chemical instruments and methods, preparation of organic compounds, preparation of carbon-based compounds, etc., can solve problems such as polluting the environment, not solving the problem fundamentally, and polluting the environment with 2-pentanone

Inactive Publication Date: 2009-06-17
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The weak point of above-mentioned method is, waste water is many, and environmental hazard is serious; In addition its raw material namely the production of 2-pentanone is also polluting environment equally.
[0005] There is also a method to prepare levulinyl from 2,3-pentanediol or 2-hydroxyl-3-pentanone. The disadvantage of this method is that the cost is high and the three wastes are many.
[0006] Or another method is to use 3-bromo-2-pentanone as raw material, react with sodium azide to generate azide and then prepare levulinyl. The disadvantage of this method is that the three wastes and corrosion of the bromination reaction are all Very serious, sodium azide itself is a highly toxic drug
[0007] In U.S. Patent USP2,799,707, a method for synthesizing levulinyl with hydroxyacetone and paraldehyde is disclosed, but the cost is high and it can only be used as a laboratory preparation method
[0008] U.S. Patent No. 6,720,456 has been improved with a phase transfer catalyst, but in fact it has not solved the problem fundamentally, and the cost and the three wastes are still the reasons why it cannot be industrialized
[0009] In summary, this area lacks a method for preparing levulinyl that can overcome the defects of existing technologies such as polluting the environment and high production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Catalyst preparation:

[0062] The catalyst bed layer is obtained as follows: add copper, zinc metal and aluminum oxide, cobalt oxide, barium oxide metal oxide catalysts in a 25mm diameter inverted U-shaped fixed-bed reactor, and the composition of the catalyst is as follows: by copper 40wt% , zinc 10wt%, aluminum oxide 30wt%, cobalt oxide 6wt%, barium oxide 14wt%. The preparation method of described catalyzer is as follows: Copper and zinc use the 80 order brass nets (wherein the ratio of copper and zinc is 4:1) that Zhangjiagang Hexing silk screen factory produces, then aluminum oxide, cobalt oxide, oxide Barium and the brass mesh were placed in the inverted U-shaped fixed-bed reactor with a diameter of 25 mm.

[0063] The outer layer of the reactor is heated by an electric heating wire, and the temperature is controlled by a voltage regulator at 180-450°C. The 3-methylbutanol is vaporized at a controlled temperature of 250°C, and air at 350°C is introduced into the...

Embodiment 2

[0067] Embodiment 2 is the same as the method of embodiment 1, the difference is:

[0068] In the preparation process of the catalyst, add the catalyst of copper, zinc and aluminum oxide, cobalt oxide, barium oxide metal oxide in the inverted U-type fixed-bed reactor of diameter 20mm, by copper 45wt%, zinc 5wt% and aluminum oxide 36wt%, Composed of 5wt% cobalt oxide and 9wt% barium oxide.

[0069] The vaporization temperature of 3-methylbutanol is 275°C. Air at 300°C is introduced into the middle of the inverted U-shaped reactor, and the space velocity of the reactants is 2500h -1 , The molar ratio of 3-methylbutanol to oxygen is 1.1.

[0070] The yield of one reaction to obtain levulinyl was 28%.

Embodiment 3

[0072] Embodiment 3 is the same as the method of embodiment 1, the difference is:

[0073] In the preparation process of the catalyst, add the catalyst of copper, zinc and aluminum oxide, cobalt oxide, barium oxide metal oxide in the inverted U-type fixed-bed reactor of diameter 20mm, by copper 48wt%, zinc 10wt% and aluminum oxide 16wt%, Composed of 8wt% cobalt oxide and 18wt% barium oxide.

[0074] The vaporization temperature of 3-methylbutanol is 300°C. Air at 480°C is introduced into the middle of the inverted U-shaped reactor, and the space velocity of the reactants is 2500h -1 , The molar ratio of 3-methylbutanol to oxygen is 1.1.

[0075] The yield of one reaction to obtain levulinyl was 26%.

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Abstract

The invention provides a method for preparing acetyl propionyl, which comprises the following steps: 3- methyl butanol is subjected to molecular rearrangement reaction and oxidation reaction at a reaction temperature of between 200 and 600 DEG C and in the presence of oxygen-containing gas, and acetyl propionyl products are obtained. The method for preparing the acetyl propionyl can reduce environmental pollution, reduce the production cost and realize industrialization.

Description

technical field [0001] The invention relates to an organic synthesis method, in particular to a preparation method of levulinyl. Background technique [0002] Levulinyl is an important intermediate in organic synthesis, which can be used to prepare medicines, as raw materials for spices, to prepare essences, and as preservatives and fungicides. [0003] At present, the industrialized production of conventional levulinyl mainly adopts the following methods: [0004] One uses 2-pentanone as a raw material and selenium dioxide as an oxidant to oxidize the methylene group adjacent to the carbonyl group to obtain a finished product. The disadvantage of the above method is that there is a lot of waste water, which is seriously harmful to the environment; in addition, its raw material, that is, the production of 2-pentanone, also pollutes the environment. [0005] There is also a method to prepare levulinyl from 2,3-pentanediol or 2-hydroxy-3-pentanone. The disadvantage of this m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/12C07C45/00C07C45/27C07C45/67
Inventor 诸富根周山花靳秀琴姜先果
Owner EAST CHINA UNIV OF SCI & TECH
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