A method for producing biodiesel and triacetin
A technology of glycerol triacetate and biodiesel, which is applied in chemical instruments and methods, biofuels, carboxylic acid ester preparation, etc., can solve the problems of high operating cost, complicated process, and incomplete esterification reaction, etc. High performance and less by-products
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Embodiment 1
[0041] Mix 1.0 g of glycerol tristearate, 0.01 g of phosphotungstic acid and 0.2 g of glacial acetic acid, react at 120 °C for 10 h, and filter at 60 °C after the reaction is completed to obtain phosphotungstic acid insoluble in acetic acid, the filtrate is cooled to 40 °C, filtered The fatty acid solid that separates out, the filtrate after vacuum distillation, reclaims acetic acid, and obtains triacetin (see accompanying drawing 1,2,3), the transformation efficiency of tristearate is 100% after analysis, triacetin The molar yield of ester is 95%; in the obtained fatty acid (see appendix Figure 4 and 5 ) was added with 0.1g methanol and 0.005g phosphotungstic acid, reacted at 140°C for 2 hours, and then distilled under reduced pressure to remove methanol, while phosphotungstic acid was precipitated from the liquid phase, and the phosphotungstic acid was recovered by filtration to obtain a biodiesel product in the liquid phase, which was chromatographed. Analysis showed that...
Embodiment 2
[0043]Mix 1.0g of tallow oil, 0.05g of benzenesulfonic acid and 100g of 80% acetic acid aqueous solution by mass percentage, and react at 140°C for 8 hours. After the reaction is completed, filter the precipitated fatty acid solids, and then distill the filtrate under reduced pressure to recover acetic acid. Add 0.01g organic solvent diethyl ether and leave to stand for layering to obtain the organic solution and the reacted catalyzer, and remove the organic solvent by distillation to obtain glyceryl triacetate. 97%; add 0.4g methanol and 0.008g phosphoric acid to the obtained fatty acid, react at 150°C for 10h, then distill the methanol under reduced pressure, and at the same time phosphoric acid separates out from the liquid phase, recover phosphoric acid, and obtain the liquid phase as biodiesel product After chromatographic analysis, the molar yield of fatty acid methyl ester is 96%, and the content is 99.2%.
Embodiment 3
[0045] Mix 1.0g of lard oil, 0.1g of p-toluenesulfonic acid and 80g of 90% acetic acid aqueous solution by mass percentage, react at 160°C for 4h, after the reaction is completed, filter the precipitated fatty acid solid, and then distill the filtrate under reduced pressure to recover acetic acid , add 0.05g organic solvent chloroform and leave standstill layering, obtain organic solution and the catalyzer after reaction, distill and remove organic solvent, obtain glyceryl triacetate, the conversion rate of oil and fat is 100% through analysis, the molar yield of glyceryl triacetate The yield is 96%; add 0.6g methanol and 0.01g phosphoric acid to the obtained fatty acid, react at 140°C for 10h, then distill the methanol under reduced pressure, and at the same time, phosphoric acid is precipitated from the liquid phase, and the phosphoric acid is recovered by filtration, and the liquid phase is obtained as a biodiesel product. According to chromatographic analysis, the molar yie...
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