Method for preparing benzalacetone under supercritical condition

Abstract

The invention discloses a method for preparing benzalacetone under the supercritical condition. According to the conventional synthetic method, reaction is realized by an autoclave, and is intermittent, low in space time yield of the reaction and high in energy consumption. According to the method, the benzalacetone is prepared by performing the one-step condensation reaction of benzaldehyde and acetone which serve as raw materials under the supercritical condition, wherein the conversion rate of the benzaldehyde is over 99 percent, and the reaction yield of the benzaldehyde is over 92 percent. According to method, other solvents and acid or base catalysts are not needed to be added, the residual acetone can be recycled directly, so the method has the advantages of environment friendliness, no pollution, high selectivity and the like.

Description

technical field

[0001] The invention relates to a method for synthesizing benzylidene acetone under supercritical conditions. Background technique

[0002] Benzylideneacetone, white or light yellow crystal, flammable, easily soluble in sulfuric acid, ethanol, ether, benzene and chloroform, slightly soluble in water and petroleum ether. It has the smell of coumarin, the color becomes darker when exposed to light, and it is easy to decompose when heated for a long time. In nature, it mainly exists in hydrolyzed soybean or hydrogenated soybean protein. The United States "Food and Pharmacological Administration (FDA)" has awarded the chemical GAPS title and approved it as an edible spice. The chemical properties of the product are relatively stable, and it is an organic compound with a wide range of uses. It has a strong sweet pea-like aroma. In the spice industry, as a raw material for synthetic spices, benzylidene acetone is used to blend sweet pea series flavors and fruity...

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