A kind of biodiesel and preparation method thereof
A biodiesel and oil technology, which is applied in the fields of biofuel, petroleum industry, bulk chemical production, etc., can solve the problems of free fatty acid conversion or low conversion rate, unsolved extraction of a large amount of solvent, and large consumption of extraction solvent. , to achieve the effect of reducing the cost of enzymes, avoiding pollution and reducing consumption
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[0030]The specific steps of the method for preparing biodiesel provided by the present invention are as follows:
[0031]To the hydrophilic ionic liquid with a purity greater than 98%, an appropriate amount of distilled water is added to prepare a hydrophilic ionic liquid with a water content of 9-20% by weight. Pour the appropriate ratio of mixed ionic liquid and waste oil into the reaction kettle, then add the immobilized Candida lipase, stir well, and finally add methanol to the reaction system at a uniform speed, and control the dropping rate so that the methanol is within 15 hours After the addition, the temperature of the reaction is controlled to be 28-35°C, the stirring rate is 180-240 rpm, and the mixing reaction is 20-26 hours. After the reaction, the system is filtered by centrifugation and left to stand for stratification. After washing and drying, Candida 99-125 lipase can be recovered. The lower phase of the filtrate is filtered and then distilled and dried to obtain glyc...
Embodiment 1
[0034]Add an ionic liquid [bmim]BF with a water content of 18wt% to 3kg of waste oil at a mass ratio of 10:0.8.4, Put into a 5 liter reactor and stir evenly, the water bath heating control temperature is 30 ℃, the stirring rate is controlled at 200 rpm, and then add the immobilized Candida 99-125 lipase based on 90 enzyme activity units per unit oil mass, and finally The methanol with a molar ratio of 5:1 to the waste oil was added to the reaction system at a uniform speed, and the dropping rate was controlled so that the methanol was added within 15 hours. The reaction was completed after 26 hours of mixing reaction. The mixed system was centrifuged and filtered and left to stand for stratification. The filter residue was washed and dried to recover Candida 99-125 lipase. The lower phase of the filtrate was filtered and then distilled and dried to obtain glycerol. The upper phase of the filtrate was used 10 times After the volume of water is extracted, the layers are separated agai...
Embodiment 2
[0036]Add an ionic liquid [emim]BF with a water content of 18wt% to 3kg of waste oil at a mass ratio of 10:1.4, Put into a 5 liter reactor and stir evenly, the water bath heating control temperature is 30 ℃, the stirring rate is controlled at 240 rpm, and then add the immobilized Candida 99-125 lipase based on 100 enzyme activity units per unit oil mass, and finally The methanol with a molar ratio of 7:1 to the waste oil was added to the reaction system at a constant speed, and the dropping rate was controlled so that the methanol was added within 15 hours. The reaction was completed after 24 hours of mixing reaction. The mixed system was centrifuged and filtered and left to stand for stratification. The filter residue was washed and dried to recover Candida 99-125 lipase. The lower phase of the filtrate was filtered and then distilled and dried to obtain glycerol. The upper phase of the filtrate was used 8 times After the volume of water is extracted, the layers are separated again...
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Abstract
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