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Process for making isopentyl aldehyde from isobutene

A technology for isobutene and isovaleraldehyde, applied in the field of preparing isovaleraldehyde, can solve the problems of high production cost, large environmental pollution, less sources and the like, and achieves the effects of low production cost, less environmental pollution and easy separation

Inactive Publication Date: 2005-01-26
SHANDONG NHU PHARMA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation method of isovaleraldehyde mainly adopts isoamyl alcohol as the oxidation method, catalytic oxidation or catalytic oxidative hydrogenation method of starting raw material, but the isoamyl alcohol used is mostly industrial grade, and its source is few, and the supply of raw materials is relatively tight. And most of isoamyl alcohol has 2,3 isomers, and the purity of industrial grade isoamyl alcohol is low, generally at 70-80%. Before isovaleraldehyde is prepared, isoamyl alcohol must be purified, and the production cost high
In addition, in the existing preparation method using catalyzer, catalyzer is not easy to separate with final product (isovaleraldehyde), which causes great environmental pollution.

Method used

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  • Process for making isopentyl aldehyde from isobutene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] In a 100ml reactor, add 10.24mmol of rhodium catalyst, after fully replaced by inert gas, add 11.8g (210mmol) of isobutene, and feed CO, H with a volume ratio of 1:1. 2 After the gas mixture, the pressure was increased to 5Mpa, the temperature was raised, and the reaction was started. After 2 hours of reaction, the temperature was lowered to stop the reaction, and 17.5 grams of the product were obtained. The product was analyzed by gas chromatography, and the content was 98.5%.

Embodiment 2

[0013] In a 100ml reactor, add 8.33mmol of rhodium catalyst, after fully replaced by inert gas, add 11.8g (210mmol) of isobutene, and feed CO, H with a volume ratio of 1:1. 2 After mixing the gas, the pressure was raised to 8Mpa, the temperature was raised, and the reaction was started. After 3 hours of reaction, the temperature was lowered to stop the reaction, and 17.3 grams of the product were obtained. The product was analyzed by gas chromatography, and the content was 98.2%.

Embodiment 3

[0015] In a 100ml reactor, add 7.00mmol of rhodium catalyst, after fully replaced by inert gas, add 11.8g (210mmol) of isobutene, and pass through CO, H with a volume ratio of 1:1. 2 After mixing the gas, the pressure was raised to 10Mpa, the temperature was raised, and the reaction was started. After 4 hours of reaction, the temperature was lowered to stop the reaction, and 17.1 grams of the product were obtained. The product was analyzed by gas chromatography, and the content was 98%.

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Abstract

The invention relates to a process for making isopentyl aldehyde from isobutene which consists of, using isobutene as starting raw material, venting inert gas to remove the air in the system at the presence of rhodium catalyst, then letting in gaseous mixture of CO and H2 with the volume ratio of 1:1 for hydrogen formylation reaction.

Description

technical field [0001] The invention relates to a method for preparing isovaleraldehyde by using isobutene 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. At present, the preparation method of isovaleraldehyde mainly adopts isoamyl alcohol as the oxidation method, catalytic oxidation or catalytic oxidative hydrogenation method of starting raw material, but the isoamyl alcohol used is mostly industrial grade, and its source is few, and the supply of raw materials is relatively tight. And most of isoamyl alcohol has 2,3 isomers, and the purity of industrial grade isoamyl alcohol is low, generally at 70-80%. Before isovaleraldehyde is prepared, isoamyl alcohol must be purified, and the production cost high. In addition, in the existing preparation method using a catalyst, the catalyst is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/49C07C47/02
Inventor 马啸黄允
Owner SHANDONG NHU PHARMA
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