Tungsten Silicate Catalyze Preparing Edible Flavor Octyl Acetate
Tungsten silicate is a tungsten heteropoly acid, its appearance is white or pale yellow deliquescent crystal, soluble in water and alcohol, soluble in crystal water itself. When heated, it has decomposition when under 600~650°C. Tungsten heteropoly acid is often used as a catalyst, so as tungsten silicate. Octyl acetate exist in citrus oil, green tea leaf oils and so on, it also exist in fruit. Octyl acetate is identified as non-toxic food by FEMA (the flavor and Extract Manufacturers Association). The preparation of octyl acetate can not be separated from the strong acid catalyst. Due to the oxidation and strong dehydration of concentrated sulfuric acid, the esterification rate is reduced, the quality of ester is poor, and the equipment is seriously corroded. A lot of waste liquid is produced in the post-treatment process, which pollutes the environment and so on. Tungsten heteropoly acid is a kind of green environmental friendly catalyst, in recent years, in the f...