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Preparation method of isovaleraldehyde

A technology for isovaleraldehyde and isoamyl alcohol, applied in the field of preparing isovaleraldehyde, can solve the problems of coking, easy pulverization of catalysts and high energy consumption, and achieve the effects of reducing manufacturing cost, high safety and less pollution

Inactive Publication Date: 2016-11-16
SHANDONG CHENGTAI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method, although the yield and conversion rate are high, there are still disadvantages such as high energy consumption, easy pulverization and coking of the catalyst at high temperature, and difficult regeneration, which still cannot meet the industrialized mass production requirements of isovaleraldehyde.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0032] Embodiment, a kind of preparation method of isovaleraldehyde, comprises the following steps,

[0033] a. Heating isoamyl alcohol to vaporization, then adding catalyst to carry out high-temperature dehydrogenation reaction, the gas generated by the reaction is condensed and separated to obtain semi-finished isovaleraldehyde;

[0034] B, get the semi-finished product isovaleraldehyde and add sodium hydroxide thereinto, shake, leave standstill after layering, discard the water layer, filter the organic layer, keep the filtrate, pass through the adsorbent column of packing aluminum oxide in the filtrate and carry out adsorption treatment, Then the adsorbed isovaleraldehyde is rectified to obtain the isovaleraldehyde with a purity of up to 99.9%.

[0035] The space velocity of the catalyst in step a is 0.8 / h, the feed rate of the isoamyl alcohol is 500ml / h, the vaporization temperature is 300°C, and the reaction temperature of the catalytic dehydrogenation is 800°C.

[0036...

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Abstract

The invention discloses a preparation method of isovaleraldehyde. The preparation method comprises the following steps: heating isopentanol till vaporization, then adding a catalyst to perform high-temperature dehydrogenation reaction, and condensing and separating gas generated by reaction to obtain semi-finished isovaleraldehyde; taking the semi-finished isovaleraldehyde, adding sodium hydroxide into the semi-finished isovaleraldehyde, vibrating and shaking, stewing and layering, abandoning a water layer, filtering an organic layer, retaining a filtrate, introducing an absorbent column filled with aluminum oxide into the filtrate for absorption treatment and then rectifying the absorbed isovaleraldehyde to obtain the isovaleraldehyde with a purity of 99.9 percent. With the adoption of the technical scheme, the preparation method disclosed by the invention has the advantages that the conversion rate of the isopentanol can reach 99.9 percent, the purity of the obtained isovaleraldehyde can reach 99.9 percent, the energy consumption is low, the manufacturing cost can be reduced, no corrosion is caused to equipment on the premise of ensuring the conversion rate and the purity, the pollution is less, and the safety is high.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular 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 fragrances, and a raw material in the food industry and pharmaceutical industry. The former domestic production of isovaleraldehyde mainly uses sulfuric acid and dichromic acid to oxidize isoamyl alcohol into isovaleraldehyde in liquid phase. However, this method has the disadvantages of serious equipment corrosion, serious environmental pollution and many side reactions. [0003] Alcohol dehydrogenation is a major method for the preparation of aldehydes and ketones. Copper, zinc, nickel, platinum, palladium, rhodium and other metals or their alloys have good activity and high selectivity for the dehydrogenation of alcohols, but precious metals such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/00C07C47/02B01J29/85
CPCC07C45/002B01J29/005B01J29/106B01J29/126B01J29/7215B01J29/85C07C47/02
Inventor 张钟文宋峰
Owner SHANDONG CHENGTAI CHEM IND
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