One-step method for preparing biodiesel by low-acid catalytic fatty or fatty acid
A biodiesel and fatty acid technology, applied in the direction of fatty acid esterification, biological raw materials, biofuels, etc., can solve the problems of high cost of enzyme preparations, poor reusability of catalysts, low conversion rate, etc. The effect of high reaction time and product conversion rate
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Embodiment 1
[0013] Embodiment 1: add 100g jatropha oil (acid value 3.8) in low-pressure reactor, 2g vitriol oil, 100g methyl alcohol, sulfuric acid is first dissolved in methanol and then joins in reactor, reaction pressure 0.2~0.3MPa, reaction temperature 85°C, reaction time 18h. After the reaction, the methanol is recovered by vacuum through the methanol distillation tower, and then the product is left to stand for 2 hours and separated into layers. The upper layer is mainly fatty acid methyl ester, and the lower layer is mainly glycerin and sulfuric acid. Wash the upper product with about 30mL of hot water at 60-70°C, let it stand for stratification, and repeat it twice. The conversion rate of methyl ester measured in glycerol was 94.4%. The obtained crude methyl ester is distilled under reduced pressure in a vacuum distillation tower, the vacuum degree is higher than -0.1MPa, and the fraction between 170°C and 190°C is taken as the final product of biodiesel.
Embodiment 2
[0014] Embodiment 2: add 100g jatropha oil (acid value 3.8), 1.5g concentrated sulfuric acid, 80g methyl alcohol in the low-pressure reaction kettle, sulfuric acid is first slowly added dropwise in the methanol and then joins in the reaction kettle, reaction pressure 0.2~0.3MPa , the reaction temperature was 95°C, and the reaction time was 19h. After the reaction, the methanol is recovered by vacuum through the methanol distillation tower, and then the reaction product is left to stand for 2 hours and separated into layers. The upper layer is mainly fatty acid methyl ester, and the lower layer is mainly glycerin and sulfuric acid. Wash the upper product with about 30mL of hot water at 60-70°C, let it stand for stratification, and repeat it twice. The conversion rate of methyl ester measured from glycerol was 95.3%. The obtained crude methyl ester is distilled under reduced pressure in a vacuum distillation tower, and the fraction between 170° C. and 190° C. is taken under the...
Embodiment 3
[0015] Embodiment 3: add 100g jatropha oil (acid value 3.8) in low-pressure reactor, 1g vitriol oil, 100g methyl alcohol, sulfuric acid is first dissolved in methanol, then sulfuric acid methanol solution is joined in reactor, reaction pressure 0.2~ 0.3MPa, reaction temperature 95°C, reaction time 20h. After the reaction, the excess methanol in the reaction product was recovered by vacuum through the methanol distillation tower, and then the remaining mixed product was left to stand for 2 hours. The upper layer was the required fatty acid methyl ester, and the lower layer was mainly glycerin and sulfuric acid phase. Wash the upper product with about 30 mL of hot water at 60-70°C, let it stand for stratification, and repeat it twice. The conversion of the methyl ester was determined to be 98.7%. The obtained crude methyl ester is distilled under reduced pressure in a vacuum distillation tower, the vacuum degree is higher than -0.1MPa, and the fraction between 170°C and 190°C i...
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