Two-step method for preparing biodiesel
A technology of biodiesel and two-step method, which is applied in the direction of biofuel, biological raw material, petroleum industry, etc., can solve the problems of complex catalyst preparation process and high energy consumption, and achieve the effect of strong adaptability, high concentration and high purity of raw materials
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Embodiment 1
[0023] Soybean oil and methanol are reacted to produce fatty acid methyl ester and glycerol. The process conditions, material input and output are as follows:
[0024] The mixture of methanol and soybean oil is sent into a tubular reactor for reaction, wherein the molar ratio of alcohol to oil is 12:1, potassium stearate is 0.08% of the mass of soybean oil, and the volume space velocity of the reaction liquid is 0.4h -1 , the reaction temperature is 280°C, and the pressure is 8MPa. After the first reaction, the oil conversion rate exceeds 96%. The pressure of the reaction mixture was directly reduced to normal pressure, methanol was recovered by flash evaporation, and then the temperature was lowered to 50° C., and stood for 4 hours to separate glycerin. The crude ester phase after the separation of glycerin, and supplemented methanol are sent to a tubular reactor for reaction, wherein the molar ratio of alcohol to oil is 12:1, and dimethyl carbonate and potassium stearate ar...
Embodiment 2
[0026] Cottonseed oil reacts with mixed fatty alcohols to produce biodiesel and glycerin. The process conditions, material input and output are as follows:
[0027] The mixed fatty alcohol is methanol solution containing 20wt% ethanol. The mixture of cottonseed oil and fatty alcohol is sent into a tubular reactor for reaction, wherein the molar ratio of alcohol to oil is 40:1, KOH is 0.05% of the quality of cottonseed oil, the reaction temperature is 250°C, the pressure is 6MPa, and the volume of the reaction solution Airspeed is 10h -1 . After the first reaction, the oil conversion rate is about 98%. The pressure of the reacted mixture was reduced to one atmospheric pressure, the fatty alcohol was recovered by flash evaporation, and then the temperature was lowered to 60° C., and the glycerol was centrifuged at 4000 rpm. The crude ester phase after separation of glycerin and supplemented fatty alcohol are fed into a tubular reactor for reaction, wherein the molar ratio of ...
Embodiment 3
[0029] Rapeseed oil reacts with methanol to produce fatty acid methyl ester and glycerol. The process conditions, material input and output are as follows:
[0030] Rapeseed oil and methanol, according to the molar ratio of alcohol to oil 15:1, are sent into the tubular reactor for reaction, wherein, NaOH is 0.03% of the mass of rapeseed oil, and the volume space velocity of the reaction liquid is 2h -1, the reactor temperature is 200°C, and the pressure is 4MPa. After the first reaction, the oil conversion rate is about 85%. The pressure of the reaction mixture was reduced, and the methanol was recovered by flash evaporation under normal pressure, and then the temperature was lowered to 50° C., and the mixture was allowed to stand for 4 hours to separate glycerin. The crude ester phase after separation of glycerin, and supplemented methanol are sent to a tubular reactor for reaction, wherein the molar ratio of alcohol to oil is 30:1, and dimethyl ether and NaOH are 10% and 0...
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