Tungstic acid is a tungsten heteropoly acid, with keggin structure, the appearance of white or pale yellow deliquescence crystals, soluble in water and alcohol.
Butyrate but also known as butyl butyrate, can be used as bananas, pineapple and other fruit essence, used in beverages, cakes and bread food. Its traditional synthesis method is under the catalysis of sulfuric acid, esterification by butyric acid and butanol. However, the method has the disadvantages of long reaction cycle and low yield. Meanwhile, sulfuric acid has a strong corrosion on the equipment and produces wastewater that pollutes the environment.
In recent years, in the food additives industry, tungsten silicate and tungsten phosphate have been widely used in place of traditional acid catalysis. They are both effective and environmentally friendly. They are the gospel of the whole food processing industry.
The preparation of butyric acid vinegar is the synthesis of butyric acid vinegar by the catalysis of tungsten silicate, the butyric acid and a certain amount of catalyst, with water and butanol added to the three bottles, with water and butanol three neck bottle, equipped with water separator, built-in quantitative saturated salt water, heated to reflux with an electric hot pot, before the reaction stopped 15min, began with water and excess alcohol distillation, the product is then cooled and butyric acid vinegar is obtained.
Tungsten silicic acid has good catalytic properties. Most of the strong acid needed to catalyze the synthesis of food additives, such as butyl acetate butyrate, isoamyl acetate, octyl acetate, levulinic, can be catalyzed by phosphotungstic acid or tungstic acid with Keggin structure. Because the structure of tungsten heteropoly acid of Keggin structure is simple, the structure is determined, and the structure characteristics of complexes and metal oxides are also included, not only with inorganic acids (such as sulfuric acid) and solid acids (such as molecular sieves), it has the essence of acid catalysts, it also has the function of free or oxygen-containing organic compounds (such as alcohols, ethers, etc.) free in and out of the heteropoly phase, which is called "pseudo liquid phase". Therefore, heteropoly acid as an acid catalyst, its acidity is much stronger than inorganic acid, but it is more environmentally friendly.
Therefore, it is necessary to test the synthesis of similar food additives, which can be safely used with phosphotungstic acid and tungstic acid as the catalysts of the two types of heteropolyacid salts.
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