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A kind of preparation method of low carbon fatty acid

A technology for fatty acids and fatty alcohols, which is applied in the field of non-metallic catalytic hydrogen peroxide oxidation to prepare low-carbon fatty acids, can solve the problems of pollution, many by-products, and high production costs of low-carbon fatty acids, and achieves safe operation, less reaction by-products, and less pollution. Effect

Active Publication Date: 2017-10-13
黄山科宏生物香料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing low-carbon fatty acids, which solves the problems of high production cost, many by-products and serious pollution of existing low-carbon fatty acids.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of low-carbon fatty acid, the specific operation method is as follows: Weigh 150g 1-propanol, 75g water and 75g urea and stir and mix at room temperature, add 1275g 20% ​​hydrogen peroxide dropwise, maintain 35°C for 12h, and analyze by gas chromatography , unreacted raw material propanol 15%, product 81%, after extraction and rectification, the finished product of propionic acid is obtained.

Embodiment 2

[0016] A preparation method of low-carbon fatty acid, the specific operation method is as follows: Weigh 220g of 3-methylbutanol, 75g of water and 75g of urea and stir and mix them at room temperature, add 1700g of 15% hydrogen peroxide dropwise, maintain 45°C for 12h, and pass through the gas phase Chromatographic analysis showed 13% of unreacted raw material 3-methylbutanol and 82.5% of product. After liquid separation and rectification, the finished product of 3-methylbutyric acid was obtained.

Embodiment 3

[0018] A kind of preparation method of low-carbon fatty acid, concrete operation method is as follows: take by weighing 185g 1-butanol, 75g water and 75g urea, stir and mix at room temperature, dropwise add 2550g 10% hydrogen peroxide, maintain 35 ℃ of reaction 18h, gas chromatography analysis, no The reaction raw material butanol is 14.8%, and the product is 80.5%. After liquid separation and rectification, the finished product of butyric acid is obtained.

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Abstract

The invention discloses a method for preparing low-carbon fatty acid, which belongs to the technical field of organic synthesis. The present invention is carried out according to the following technical steps: weighing low-carbon fatty alcohol, water and urea, stirring and mixing, and then adding hydrogen peroxide dropwise for oxidation reaction; the concentration of hydrogen peroxide is 5-30%; the reaction temperature is 0-50°C; the reaction time is 5-20h; The molar ratio of urea, hydrogen peroxide and low-carbon fatty alcohol is 0.1-1:2-5:1. The method for preparing low-carbon fatty acid of the present invention has the advantages of simple operation, less environmental pollution, no corrosion to reaction equipment, high efficiency, low processing cost, etc., and can be widely used in the field of preparing low-carbon fatty acid.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a method for preparing low-carbon fatty acids by non-metal catalyzed oxidation of hydrogen peroxide. Background technique [0002] Low-carbon fatty alcohols such as 1-propanol, 1-butanol, isobutanol, 2-methylbutanol, 3-methylbutanol, etc. are widely present in the main by-product impurities of ethanol and beer produced by fermentation of cereal crops. Alcohol oil is an important raw material for the preparation of biomass low-carbon fatty acids. [0003] The preparation of fatty acids from fatty alcohols is one of the important reactions in organic synthesis, but it is also challenging. Traditional preparation methods include alkali dehydrogenation method and oxidation method, wherein alkali dehydrogenation method needs high temperature and high pressure reaction, consumes a lot of energy, and the reaction product exists in the form of sodium salt, which must be neutra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/235C07C53/122C07C53/124C07C53/126C07C53/128
CPCC07C51/235C07C53/122C07C53/124C07C53/126C07C53/128C07C51/285
Inventor 程存照贾卫民王之建
Owner 黄山科宏生物香料股份有限公司
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