Method for preparing biodiesel
A technology for biodiesel and products, which is applied in the fields of biofuel, petroleum industry, fatty acid production, etc., can solve the problems of low conversion rate, inactivation, poor stability of liquid enzymes, etc.
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Embodiment 1
[0075] Take 200g acidified oil into the reaction flask, preheat to 35°C, add 1g TLL liquid enzyme (protein content 20mg / mL), 30g water and 200ppm NaOH solution, and mechanically stir at 250rpm. The reaction was carried out at 35°C for 3 hours, during which time 8 mL of methanol was added to the reaction flask in 7 times within 3 hours. Then 1g of RML liquid enzyme (protein content 6mg / mL) was added, 62mL of methanol was continuously fed within 20h, and the reaction was continued for 1h. After the reaction was completed, the upper layer of the methyl ester phase was removed by rotary evaporation at 75° C. after standing and layering for determination and analysis. The test results are shown in Table 1.
Embodiment 2
[0088]Get 80g frying waste oil and 120g pre-melted PFAD and mix evenly (TAG 46.1%, DAG 2.4%, MAG1.1%, FFA 48.2%, iodine value 48.6gI 2 / 100g, saponification value 193mgKOH / g), added to the reaction bottle, preheated to 40°C, and added 1g TLL enzyme solution (protein content 20mg / mL), 20g water, mechanically stirred at a speed of 250rpm. React at 40°C for 2 hours, during which 5 mL of methanol was added to the reaction flask 5 times within 2 hours, and samples were taken for measurement. Then 1.2g RML enzyme solution (protein content 6mg / mL) was added, 65mL methanol was continuously fed within 18h, and the reaction was continued for 1h. After the reaction was completed, the upper layer of the methyl ester phase was removed by rotary evaporation at 75° C. after standing and layering, and then used for determination and analysis. The test results are shown in Table 2.
[0089] Table 2: Determination and analysis results (% by weight)
[0090]
Embodiment 3
[0092] Take 200g of waste oil into the reaction bottle, preheat to 30°C, add 0.8g of TL enzyme solution (protein content 20mg / mL), 10g of water, and mechanically stir at 250rpm. Add 25mL of methanol into the reaction flask in 13 times within 6h. Then 0.8g RM enzyme solution (protein content 6mg / mL) was added, 45mL methanol was continuously fed within 12h, and the reaction was continued for 2h. After the reaction was completed, the upper layer of the methyl ester phase was removed by rotary evaporation at 75° C. after standing and layering, and then used for determination and analysis.
[0093] Table 3: Determination and analysis results (% by weight)
[0094]
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