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Method for synthesizing methoxyacetone by 1-methoxy-2-propanol gas phase oxidation dehydrogenation

A gas-phase dehydrogenation technology of methoxyacetone, which is applied in the field of chemical industry, can solve the problems of low selectivity, difficulty in oxidation of 1-methoxy-2-propanol, difficulty in separation of methoxyacetone, etc. simple effect

Inactive Publication Date: 2008-02-13
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the synthesis method of methoxyacetone is mainly obtained by oxidation of 1-methoxy-2-propanol as raw material, but due to the formation of intramolecular hydrogen bonds and the electron-withdrawing induction effect of methoxy group, 1-methoxyacetone Oxy-2-propanol is difficult to be oxidized
[0003] In the synthetic methods reported in the literature and patents at present, the liquid phase reaction Na 2 WO 4 -H 2 o 2 , Pt / C and other systems have good conversion and selectivity, but are not conducive to industrial production due to their discontinuity and short life; some metal catalysts in gas-solid phase reactions often have low selectivity, Sinopec Fushun Petrochemical The FDH type catalyzer developed by the research institute, the selectivity can reach 99%, but the conversion rate is low (<70%), although obtained higher yield but due to 1-methoxy-2-propanol and methoxyacetone The boiling point is very close, and the methoxyacetone in the product is not easy to separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Adopt 3.0g electrolytic silver catalyst, 1-methoxy group-2-propanol and oxygen are raw materials, the volume fraction that nitrogen occupies after nitrogen dilution is 89.8%, raw material reacts in stainless steel fixed-bed reactor after vaporization, reaction temperature 300°C, Feed Oxygen Alcohol Ratio 1.25, Liquid Hourly Space Velocity 5.45h -1 , the conversion rate of 1-methoxy-2-propanol is 68.83%, and the selectivity of product methoxyacetone is 73.02%.

Embodiment 2

[0017] Adopt 3.0g electrolytic silver catalyst, 1-methoxy group-2-propanol and oxygen are raw materials, the volume fraction that nitrogen occupies after nitrogen dilution is 89.8%, raw material reacts in stainless steel fixed-bed reactor after vaporization, reaction temperature 465°C, Feed Oxygen Alcohol Ratio 1.25, Liquid Hourly Space Velocity 5.45h -1 , the conversion rate of 1-methoxy-2-propanol is 96.77%, and the selectivity of product methoxyacetone is 62.29%.

Embodiment 3

[0019] Adopt 3.0g electrolytic silver catalyst, 1-methoxy group-2-propanol and air are raw material, the volume fraction that nitrogen occupies after nitrogen dilution is 89.0%, raw material reacts in stainless steel fixed-bed reactor after vaporization, reaction temperature 600°C, Feed Oxygen Alcohol Ratio 1.25, Liquid Hourly Space Velocity 5.45h -1 , the conversion rate of 1-methoxy-2-propanol is 91.14%, and the selectivity of the product methoxyacetone is 33.40%.

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Abstract

The present invention belongs to a chemical technology region, in particular to a preparation method for methoxy acetone by the composing of gas phase dehydrogenation with 1- methoxy-2-ethyl carbinol. The method uses an electrolyzing argentine as the catalyzer; the vaporized 1- methoxy-2-ethyl carbinol is mixed with the oxygen first and then the mixture enters the catalyzing bed to be taken with gas phase oxidation and dehydrogenation reaction to obtain methoxy acetone. The method is characterized in that: the method has the advantages of simple composing process, which can be taken continually. Under the temperature of 300-600 Celsius system, the change ratio reaches up to 98 percent; the selectivity of methoxy acetone reaches up to 70 percent.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a method for synthesizing methoxyacetone by gas-phase oxidative dehydrogenation of 1-methoxy-2-propanol. Background technique [0002] Methoxyacetone is an important fine chemical product, mainly used as a raw material for the pesticide metolachlor (Dour) and some pharmaceutical synthesis. As a low-toxicity herbicide, metolachlor has been widely used in northern China of dry fields. At present, the synthesis method of methoxyacetone is mainly obtained by oxidation of 1-methoxy-2-propanol as raw material, but due to the formation of intramolecular hydrogen bonds and the electron-withdrawing induction effect of methoxy group, 1-methoxyacetone Oxy-2-propanol is difficult to be oxidized. [0003] In the synthetic methods reported in the literature and patents at present, the liquid phase reaction Na 2 WO 4 -H 2 o 2 , Pt / C and other systems...

Claims

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Application Information

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IPC IPC(8): C07C49/175C07C45/39
Inventor 李楠沈伟徐华龙邱建立
Owner FUDAN UNIV