Method for preparing fatty acid methyl ester by using waste edible oil
A technology for discarding edible oils and fatty acid methyl esters, applied in directions such as fatty acid esterification, can solve the problems of low single-pass yield of fatty acid methyl esters, the need for pretreatment of raw materials, and the large ratio of reaction alcohol to oil, so as to eliminate the loss of raw material methanol, The effect of improving yield and high conversion rate of fatty acid
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Embodiment 1
[0015] Add 100g of waste edible oil (acid value 155mgKOH / g) and 25.5g of glycerin (99% content, Beijing Chemical Reagent Co. Feed nitrogen at a speed of 1 / min, and turn on the water ring vacuum pump to maintain the vacuum of the reaction system at 50KPa, raise the temperature to 140°C under stirring conditions, and react for 2 hours; measure the acid value of the esterification product after the reaction; esterification The final product is based on the molar ratio of methanol to oil of 1:1, and 0.5% KOH is added as a catalyst, and the esterification reaction is carried out at normal pressure and 60-65 °C for 1 hour, and the glycerol and methyl ester are separated by sedimentation, and the transesterified product is analyzed by chromatography. Fatty acid methyl ester content and yield. The results are shown in Table 1.
Embodiment 2
[0017] Add 100g of waste edible oil (acid value 155mgKOH / g) and 38.2g of glycerin (99% content, Beijing Chemical Reagent Company) according to the molar ratio of fatty acid to glycerol of 1:1.5, and add it to a 300ml three-necked flask at the same time, and press 10ml Feed nitrogen at a speed of 1 / min, and turn on the water ring vacuum pump to maintain the vacuum of the reaction system at 30KPa, raise the temperature to 160°C under stirring conditions, and react for 2 hours; measure the acid value of the esterification product after the reaction; esterification The final product is based on the molar ratio of methanol to oil of 1:1, and 0.5% KOH is added as a catalyst, and the esterification reaction is carried out at normal pressure and 60-65 °C for 1 hour, and the glycerol and methyl ester are separated by sedimentation, and the transesterified product is analyzed by chromatography. Fatty acid methyl ester content and yield. The results are shown in Table 1.
Embodiment 3
[0019] Add 100g of waste edible oil (acid value 155mgKOH / g) and 51.0g of glycerin (99% content, Beijing Chemical Reagent Company) according to the molar ratio of fatty acid to glycerol of 1:2, and add it to a 300ml three-necked flask at the same time, and press 10ml Nitrogen gas was introduced at a speed of 1 / min, and the water ring vacuum pump was turned on to maintain the vacuum degree of the reaction system at 50KPa, and the temperature was raised to 200°C under stirring conditions, and the reaction was carried out for 1 hour; after the reaction, the acid value of the esterification product was measured; esterification The final product is based on the molar ratio of methanol to oil of 1:1, and 0.5% KOH is added as a catalyst, and the esterification reaction is carried out at normal pressure and 60-65 °C for 1 hour, and the glycerol and methyl ester are separated by sedimentation, and the transesterified product is analyzed by chromatography. Fatty acid methyl ester content ...
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