Nature-identical 2,3-butanedione flavor and preparation method thereof

Abstract

The invention relates to a nature-identical 2,3-butanedione flavor and a preparation method thereof. The nature-identical 2,3-butanedione flavor contains the following components in parts by weight: 1000 parts of acetaldehyde and 1-10 parts of composite catalyst. By adopting the technology of the invention, the raw materials are accessible, the conversion rate of the raw materials is high, the conditions of the two-step reaction are mild, the content of 2,3-butanedione in the product is high, the natural degree is high, the production technology is clean, mass production can be realized, the production cost is low, and three wastes can not be generated.

Description

technical field [0001] The invention relates to a natural equivalent 2,3-butanedione fragrance and its preparation technology. Background technique [0002] 2,3-Butanedione is also called diacetyl, referred to as DC, and its molecular formula is CH3COCOCH3. It is an important fragrance with a strong creamy fragrance from yellow to light green. It is widely used in It can be used to prepare cream essence, strawberry essence, wine essence, suckling pig feed essence, it can also be used as a hardening agent for gelatin, and it can also be used as an intermediate in the synthesis of medicine, pesticide and fine chemicals (such as heterocyclic compounds). [0003] At present, there are several methods for preparing diacetyl at home and abroad: [0004] 1. Natural product extraction method: It is obtained by the free method from the essential oil containing diacetyl. Due to the high cost of raw materials, it cannot be industrialized. 2. Methyl ethyl ketone oxidation method: many...

AI Technical Summary

Problems solved by technology

[0004] 1. Natural product extraction method: It is obtained from the essential oil containing diacetyl by the free method. Due to the high cost of raw materials and high product cost, it cannot be industrialized

2. Methyl ethyl ketone oxidation method: many specific and in-depth studies have been carried out on this method at home and abroad. Different oxidants can be used to prepare diacetyl, such as sodium nitrite oxidation method, selenium dioxide ozone oxidation method, air oxidation method, etc., but due to Heavy pollution, expensive catalysts, harsh oxidation conditions, complicated process, rare natural equivalent high-purity products

3. Methyl ethyl ketone oximation method, which is a method commonly used by domestic manufacturers at present, is to use methyl ethyl ketone and nitrite to carry out oximation reaction under the action of acid, and prepare diacetyl through processes such as crystallization, hydrolysis, and distillation. The process is also The pollution is serious, and the toxicity of nitrite is high, the purity of the obtained product is low, and the natural equivalence is poor

4. Isobutyraldehyde gas phase oxidation method, which uses isobutyraldehyde as raw material and oxidizes with air. Recently, there are many researches at home and abroad. It is generally believed that it is better than 1-3 methods, but there are complex reactions, many side reactions and pollution problems. Moreover, the product has poor natural equivalence

5. Microbial fermentation method. Although this method can obtain natural equivalent diacetyl, it is difficult to produce on a large scale due to low yield, large investment, and difficult treatment of fermentation wastewater