Treatment method of glycerol as by-product of biodiesel
A treatment method, biodiesel technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of hydroxyl compounds, etc., can solve the problems of high energy consumption, unfavorable industrial application, complicated process, etc., and achieve low energy consumption , simple steps, low energy consumption
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Embodiment 1
[0033] (1) 100 mL of by-product glycerol from the above tung oil biodiesel was heated in a water bath to 70°C; the pH was adjusted to 5.0 with 10 mol / L sulfuric acid; it was left to stand in a separatory funnel for 10 hours, and the clear liquid was removed.
[0034] (2) Add 20 mL of methanol to the lower phase glycerin clear solution obtained in step (1), mix well and let stand for 2 hours.
[0035] (3) Centrifuge the solution obtained in step (2) at 10,000 rpm for 25 min to remove the precipitate and take the supernatant.
[0036] (4) Add the glycerin clear solution obtained in step (3) into 15mL of water, mix well, and perform electrodialysis. When the conductivity is less than 100μs / cm, the supernatant is collected for rectification.
[0037] (5) Distill the glycerin clear liquid obtained in step (4) under atmospheric pressure, and collect the still residue at 85°C.
[0038]Experimental results: The glycerol clear liquid obtained in step (3) was analyzed by gas quality, ...
Embodiment 2
[0040] (1) 5L of glycerol by-product of the above-mentioned tung oil biodiesel was heated in a water bath to 60°C; the pH was adjusted to 5.5 with 10mol / L hydrochloric acid; it was left to stand in a separatory funnel for 15 hours, and the clear liquid was removed.
[0041] (2) Add 700 mL of methanol to the lower phase glycerin clear solution obtained in step (1), mix well and let stand for 5 hours.
[0042] (3) Centrifuge the solution obtained in step (2) at 15000 rpm for 10 min to remove the precipitate and take the supernatant.
[0043] (4) Add the glycerin clear solution obtained in step (3) into 700mL of water, mix well, and then perform electrodialysis. When the conductivity is less than 100μs / cm, the supernatant is collected for rectification.
[0044] (5) Distill the glycerin clear liquid obtained in step (4) under atmospheric pressure, and collect the still residue at 85°C.
[0045] Experimental results: The glycerin clear liquid obtained in step (3) was analyzed by...
Embodiment 3
[0047] (1) 10L of glycerol by-product of the tung oil biodiesel was heated in a water bath to 80°C; the pH was adjusted to 4 with 10mol / L phosphoric acid; it was left to stand in a separatory funnel for 15 hours, and the clear liquid was removed.
[0048] (2) Add 3 L of ethanol to the lower phase glycerin clear solution obtained in step (1), mix well and let stand for 5 hours.
[0049] (3) Centrifuge the solution obtained in step (2) at 10,000 rpm for 20 min to remove the precipitate and take the supernatant.
[0050] (4) Add the glycerin clear solution obtained in step (3) into 1.6L of water, mix well, and perform electrodialysis operation. When the conductivity is less than 100μs / cm, the supernatant is collected for rectification.
[0051] (5) Distill the glycerin clear liquid obtained in step (4) under atmospheric pressure, and collect the still residue at 85°C.
[0052] Experimental results: The glycerin clear liquid obtained in step (3) was analyzed by gas quality, and ...
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