Biodiesel Catalyzed Preparation by Ionic Liquid Phosphotungstic Acid
- Details
- Category: Tungsten Information
- Published on Tuesday, 24 October 2017 12:55
Biodiesel is usually synthesized from vegetable oils and fats and waste edible oils by simple transesterification.
In the synthesis of biodiesel, the key technology is the selection of the catalyst, the traditional inorganic acid and alkali catalyst, facing strong corrosive and non renewable, easy to cause problems such as saponification reaction against the original intention of the environmental protection of bio diesel.
Phosphotungstic acid is an environmentally friendly catalyst widely used in catalysis in recent years. It has strong acidity, and many industrial processes that need to be catalyzed by inorganic acids can be replaced by phosphotungstic acid. But in the biodiesel production process, found itself acid soluble in water, for many catalytic processes of catalytic esterification, the esterification rate is generally not high, in addition, the activity of the heteropoly salt group easily lost, so that it can not be used repeatedly, which leads to high cost.
Even so, the omnipotent chemists still found the solution. Ionic liquid is a kind of green solvent and catalyst. Its structure and acidity and basicity can be controlled. Then, morpholine ring cation was combined with heteropoly acid anion to obtain a novel organic heteropolyacid catalyst - morpholine phosphotungstate catalyst [C3SO3Hnhm] 3PW12O40. Through the design of functional structure and heteropoly acid anions for organic cation, the comprehensive performance of adjusting the catalyst, while maintaining the catalytic activity, alleviate the corrosion of traditional catalyst and solid acid and alkali catalyst, high cost and difficult separation.
Some scholars use morpholine phosphotungstate catalyst soybean oil and methanol reaction preparation of biodiesel. The results showed that when the mass fraction of n (methanol): n (soybean oil) = 14: 1, the mass fraction of tungstate catalyst was 4% of the total mass of soybean oil and methanol, the reaction time was 6 hours, the reaction temperature was 100 °C, Yields reached 94. 90%.
More surprising is that morpholine phosphotungstate catalyst not only has a good catalytic effect, the catalyst after the catalyst can be repeated recycling, catalytic 6 times, the recovery rate is still 91%, and the reaction of the [C3SO3Hnhm] 3PW12O40 structure did not change.
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