Tungsten silicate is a kind of tungsten heteropoly acid with Keggin structure, recently it is widely used as food additives on catalytic synthesis.
Its appearance is white or pale yellow deliquescent crystal. Isopentyl cinnamate is a kind of perfume. It is a colorless viscous liquid with cocoa flavor. It is mainly used in food and daily chemical industry. It is a kind of spice which has a bright future to be developed. The traditional synthesis is catalyzed by sulfuric acid, cinnamic acid and isoamyl alcohol process acetification, the main drawback of this method is the existence of long reaction time, low yield, complex process polluted water on environment, sulfate has strong corrosive effect on equipment.
Tungsten silicate is an environmentally friendly green catalyst, it has the structural characteristics of complexes and metal oxides, it has the acid catalysts function as inorganic acids (such as sulfuric acid) and solid acids (such as molecular sieves). In the food additives industry, it has also been used to replace traditional acid catalysts, both effective and environmentally friendly.
Test method for synthesis of cinnamic acid isopentyl acetate is that get some cinnamic acid and a certain amount of catalyst, water carrying agent (benzene) isoamyl alcohol into three bottles, equipped with water separator, the water separator is equipped with quantitative saturated salt water, heat the reflux with an electric pan, then begin to steam the water carrying agent and the excess alcohol 15min before stopping the reaction, and cool the product down.
The reaction conditions for tungsten silicate catalytic synthesis of cinnamic acid isopentyl acetate is mild, acetification rate is high, less dosage, recyclable. Therefore, tungsten silicate can be used instead of many kinds of food additives in the synthesis of acid catalysts, which is basically a consensus among many scholars.
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