Method for synthesizing Yiyuyin through catalysis of acetaldehyde

A technology of acetaldehyde catalysis and acetoin, which is applied in chemical instruments and methods, preparation of carbon-based compounds, preparation of organic compounds, etc., can solve the problems of difficult purification of products, high cost, increased production cost, etc., and achieves less by-products. , the effect of high product purity

Inactive Publication Date: 2005-01-12
大连金菊化工厂
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Problems solved by technology

However, the first two methods above have disadvantages such as high cost and difficult purification of products, which limit mass production; the third method conforms to the emerging trend of contemporary green chemistry research and development, and realizes a one-step method based on the principle of "atom economy". Synthesis of acetoin, but in the existing literature, Breslow (J.Am.Chem.Soc.80, 3719 (1959)) is the first to use thiazole onium salt as a catalyst to synthesize acetoin compounds, but its catalyst mole Consumption is the 5-20% (mol ratio) of reaction raw material, thus has limited the use of thiazoles onium salt; product, but its catalyst preparation is more complicated, which increases the production cost

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  • Method for synthesizing Yiyuyin through catalysis of acetaldehyde
  • Method for synthesizing Yiyuyin through catalysis of acetaldehyde

Examples

Experimental program
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Effect test

Embodiment 1

[0014] 700 grams of acetaldehyde and 7 grams of ((1wt%) 5-benzyl-4-(N-methyl-N-anilino)-3-octyl-1,3-thiazole chloride salt were added to the two-liter autoclave , start stirring and heat up, control the reaction temperature at 100° C., and the reaction time is 5 hours. Gas chromatography analysis after the reaction shows that the conversion rate of acetaldehyde is 85%, and the product selectivity is 94%.

Embodiment 2

[0016] 700 grams of acetaldehyde and 7 grams of ((1wt%) 5-benzyl-4-(N-methyl-N-anilino)-3-octyl-1,3-thiazole chloride salt were added to the two-liter autoclave , start stirring and heat up, control the reaction temperature at 120° C., and the reaction time is 3 hours. Gas chromatography analysis after the reaction shows that the conversion rate of acetaldehyde is 93%, and the product selectivity is 97%.

Embodiment 3

[0018] 700 grams of acetaldehyde and 7 grams of ((1wt%) 5-benzyl-4-(N-methyl-N-anilino)-3-octyl-1,3-thiazole chloride salt were added to the two-liter autoclave , start stirring and heat up, control the reaction temperature at 140° C., and the reaction time is 0.5 hour. Gas chromatography analysis after the reaction shows that the acetaldehyde conversion rate is 98%, and the product selectivity is 99%.

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Abstract

Ethyl aldehyde is directly synthesized into ethyl acyloin under catalyst of thiazol salt, needing no solvents. This invention process has advantages of: low by-product, high pureness (after simple distillation the product ethyl acyloin is obtd. with pureness of 98.7%), high selectivity of 99%, and suitable for use to produce essences with types of butter, milchigs, leben and strawberry etc.

Description

technical field [0001] The invention belongs to the technical field of acetoin preparation and relates to a method for synthesizing acetoin by catalyzing acetaldehyde. Background technique [0002] Acetoin, also known as vinegar, methyl acetylmethanol, and 3-hydroxy-2-butanone, has a pleasant creamy aroma. It is widely used in the preparation of cream, dairy products, yogurt and strawberry flavors, and is a spice product approved for use in my country (GB / T 14156-93). Acetoin naturally exists in cream, cocoa, wine and strawberries, and is an extremely important species in wine flavoring, but its content is small, and currently used are synthetic products. Due to the extremely wide range of applications and large dosage, there are many reports on the synthesis of acetoin. Among the existing methods, the more important ones are decarboxylation of acetolactate, selective reduction of 2,3-butanedione and catalytic coupling of acetaldehyde. However, the first two methods above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/61C07C49/17
Inventor 孙芝
Owner 大连金菊化工厂
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