Method for preparing biodiesel by virtue of two-step catalytic conversion of microalgae with high acid value
A technology for catalytic conversion and biodiesel, which is applied in the fields of biofuel, fatty acid esterification, and fat production, can solve the problems of complex separation process, large amount of methanol, low catalytic efficiency, etc., to shorten the reaction time, facilitate popularization and application, The effect of increasing the reaction rate
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Embodiment 1
[0017] A method for preparing biodiesel by in-situ two-step catalytic conversion of high acid value microalgae, comprising the following steps:
[0018] (1) Take 300mg of Chlorella vulgaris algae powder (acid value 4.0mgKOH / g) in a 10mL polytetrafluoroethylene centrifuge tube, add 30mg of solid acid (Amberlyst15) (10%, catalyst / algae powder) and methanol 1.5 mL, in a constant temperature water bath at 60°C, after reacting for 60min, place the reactor in a -20°C refrigerator to stop the reaction, filter out the solid acid, wash the acidic catalyst with 2mL of methanol for 3 times, combine the washings and pour into the reaction In the reactor, the methanol solution in the reactor was recovered with a rotary evaporator.
[0019] (2) Add methanol solution of potassium hydroxide (4%, 1.5mL) to the reaction system in step (1), the reaction conditions are the same as those described in (1), and after 60 minutes of reaction, place the reactor in a -20°C refrigerator to make The reac...
Embodiment 2
[0023] (1) Take 300mg of Phaeodactylum tricornutum algae powder (acid value 3.6mgKOH / g) in a 10mL polytetrafluoroethylene centrifuge tube, add 30mg of solid acid (Amberlyst15) (10%, catalyst / algae powder) and methanol 1.5 mL, placed in a constant temperature water bath, 60°C constant temperature water bath, after 40 minutes of reaction, place the reactor in a -20°C refrigerator to stop the reaction, filter out the solid acid, wash the acidic catalyst with 2mL of methanol for 3 times, wash the The liquid was combined and poured into the reactor, and then the methanol solution in the reactor was recovered with a rotary evaporator.
[0024] (2) Add methanol solution of potassium hydroxide (4%, 1.5mL) to the reaction system in step (1), the reaction conditions are the same as those described in (1), and after 60 minutes of reaction, place the reactor in a -20°C refrigerator to make The reaction was stopped; the layers were left to stand, the upper layer was the methyl ester phase,...
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