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Preparation method for isopentyl aldehyde

A technology for isovaleraldehyde and isoamyl alcohol, applied in the field of preparing isovaleraldehyde, can solve the problems of many side reactions, high production energy consumption, large environmental pollution and the like, achieve high conversion rate and selectivity, high production safety, The effect of large specific surface area

Inactive Publication Date: 2005-01-19
SHANDONG NHU PHARMA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of isovaleraldehyde mainly adopts oxidation method at present, with sulfuric acid, dichromic acid (salt), Cr 2 o 3 , MnO 2 Etc. in the liquid phase, isoamyl alcohol is oxidized into isovaleraldehyde, and sulfuric acid and dichromic acid (salt) are seriously corrosive to equipment, causing great environmental pollution and many side reactions; 2 o 3 , MnO 2 Although the selectivity is high, the catalyst cost is high
[0003] Volume 27, No. 4 (1998) "Guangxi Chemical Industry" published an article "Research on the Catalytic Oxidation of Isoamyl Alcohol to Isovaleraldehyde on Ag / KZSM-5", which disclosed a method for preparing isoamyl alcohol with isoamyl alcohol. The method of valeraldehyde, this method uses Ag / KZSM-5 molecular sieve as catalyst, under the condition of heating high temperature, feeds air and carries out catalytic oxidation, this technology is less to environmental pollution, conversion rate and selectivity are high, but catalyst preparation is not easy, use Noble metal Ag, catalyst preparation cost is high, service life is short, production energy consumption is high; and the amount of oxygen in the reaction is not easy to control, excessive oxygen will cause deep oxidation of isovaleraldehyde or isoamyl alcohol at high temperature, and even generate CO 2 and H 2 o
In addition, isoamyl alcohol and isovaleraldehyde have a wide range of explosion limits, and there is a great potential safety hazard under high temperature and aerobic conditions; at the same time, the tail gas discharged with excess air (oxygen) contains a large amount of organic gas, which is very prone to explosion
In the absence of solving the above safety problems, the above methods are difficult to realize industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] 100 grams of raw material isoamyl alcohol (content 99%) is continuously sent to the preheater for vaporization by a pump, the feed rate is controlled at about 300ml / h, the temperature of the preheater is controlled at 200°C, and then the air velocity into the preheater is 0.45 / h In the fixed-bed reactor of mesh-shaped copper / zinc alloy, heat to 460°C, the reaction product enters the condenser to cool, and after decompression rectification and separation, the product isovaleraldehyde 94.3 grams is obtained. After gas chromatography analysis, the content is ≥99.0 % (m / m), the conversion rate is 96.5%.

Embodiment 2

[0012] 100 grams of raw material isoamyl alcohol (content 99%) is continuously sent to the preheater for vaporization by a pump, the feed rate is controlled at about 260ml / h, the temperature of the preheater is controlled at 240°C, and then the air velocity into the preheater is 0.5 / h In the fixed-bed reactor of mesh-shaped copper / tin alloy, heat to 480°C, the reaction product enters the condenser to cool, and after decompression and rectification separation, the product isovaleraldehyde 92.8 grams is obtained. After gas chromatography analysis, the content is ≥99.0 % (m / m), the conversion rate is 95%.

Embodiment 3

[0014] 100 grams of raw material isoamyl alcohol (content 99%) is continuously sent to the preheater for vaporization by a pump, the feed rate is controlled at about 330ml / h, the temperature of the preheater is controlled at 180°C, and then the air velocity into the preheater is 0.3 / h In the fixed-bed reactor of mesh-shaped copper / nickel alloy, heated to 430°C, the reaction product enters the condenser to cool, and after decompression and rectification separation, the product isovaleraldehyde 93.5 grams is obtained. After gas chromatography analysis, the content is ≥99.0 % (m / m), the conversion rate was 95.7%.

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Abstract

The invention relates to a process for preparing isopentyl aldehyde by using isoamyl alcohol as initial raw material, which comprises, heating isoamyl alcohol to evaporation, using brass category catalyst for high temperature catalytic dehydrogenation reaction, condensing and disintegrating to obtain the isoperntyl aldehyde product. The said brass category catalyst is copper / zinc alloy, copper / tin alloy or copper / nickel alloy.

Description

technical field [0001] The invention relates to a method for preparing isovaleraldehyde by using isoamyl alcohol as a starting material. Background technique [0002] Isovaleraldehyde is a raw material for producing isovaleric acid, an intermediate for synthesizing flavors and fragrances, and a raw material for the food and pharmaceutical industries. The preparation method of isovaleraldehyde mainly adopts oxidation method at present, with sulfuric acid, dichromic acid (salt), Cr 2 o 3 , MnO 2 Etc. in the liquid phase, isoamyl alcohol is oxidized into isovaleraldehyde, and sulfuric acid and dichromic acid (salt) are seriously corrosive to equipment, causing great environmental pollution and many side reactions; 2 o 3 , MnO 2 Although the selectivity is high, the cost of the catalyst is high. [0003] Volume 27, No. 4 (1998) "Guangxi Chemical Industry" published an article "Research on the Catalytic Oxidation of Isoamyl Alcohol to Isovaleraldehyde on Ag / KZSM-5", which d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/29C07C47/02
Inventor 马啸
Owner SHANDONG NHU PHARMA
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