Method for preparing biodiesel by solid superbase catalysis
A solid super-alkali and biodiesel technology, which is applied in the chemical industry, can solve the problems of harsh reaction conditions and difficulty in large-scale industrial production, and achieve the effects of short preparation time, simple preparation and high yield
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Embodiment 1
[0024] S1, the preparation of catalyst
[0025] Add 14.8g of magnesium nitrate and 10.65g of zirconium nitrate to 30mL of water and 100mL of ethanol to make a solution, add 1mol / L LiOH to the solution, the pH value is 11, reflux and aging for 36 hours, centrifuge, the precipitate is washed with water, dried overnight, in nitrogen Under the atmosphere, the precipitate was put into a muffle furnace and calcined at a high temperature of 800° C. for 3 hours to obtain a solid superbase catalyst A with a Li content of 2%.
[0026] S2, the preparation of biodiesel
[0027] 1) Add sodium hydroxide solution with a mass concentration of 20% to rapeseed oil, stir for 5 hours, separate layers, wash the upper liquid with 80°C distilled water until pH = 7, then add cyclohexane to reflux at 90°C for reaction 5h, and finally vacuum distillation to obtain refined rapeseed oil;
[0028] 2) After mixing methanol and refined rapeseed oil, add the catalyst prepared in step S1, wherein the mass r...
Embodiment 2
[0030] S1, the preparation of catalyst
[0031] Add 14.8g of magnesium nitrate and 8.52g of zirconium nitrate to 30mL of water and 100mL of ethanol to make a solution, add 1mol / L LiOH to the solution, the pH value is 11, reflux and aging for 36 hours, centrifuge, the precipitate is washed with water, dried overnight, in nitrogen Under the atmosphere, the precipitate was put into a muffle furnace and calcined at a high temperature of 800° C. for 3 hours to obtain a solid superbase catalyst B with a Li content of 0.7%.
[0032] S2, the preparation of biodiesel
[0033] 1) Add sodium hydroxide solution with a mass concentration of 20% to rapeseed oil, stir for 5 hours, separate layers, wash the upper liquid with 80°C distilled water until pH = 7, then add cyclohexane to reflux at 90°C for reaction 5h, and finally vacuum distillation to obtain refined rapeseed oil;
[0034] 2) After mixing methanol and refined rapeseed oil, add the catalyst prepared in step S1, wherein the mass ...
Embodiment 3
[0036] S1, the preparation of catalyst
[0037]Add 14.8g of magnesium nitrate and 10.65g of zirconium nitrate to 30mL of water and 100mL of ethanol to make a solution, add 1mol / L LiOH to the solution, the pH value is 10, reflux and aging for 36 hours, centrifuge, the precipitate is washed with water, dried overnight, in nitrogen Under the atmosphere, the precipitate was put into a muffle furnace and calcined at a high temperature of 800° C. for 3 hours to obtain a solid superbase catalyst C with a Li content of 1.1%.
[0038] S2, the preparation of biodiesel
[0039] 1) Add sodium hydroxide solution with a mass concentration of 20% to rapeseed oil, stir for 5 hours, separate layers, wash the upper liquid with 80°C distilled water until pH = 7, then add cyclohexane to reflux at 90°C for reaction 5h, and finally vacuum distillation to obtain refined rapeseed oil;
[0040] 2) After mixing methanol and refined rapeseed oil, add the catalyst prepared in step S1, wherein the mass ...
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