Method for removing dbds in mineral insulating oil by alkaline chitosan film
A technology of mineral insulating oil and chitosan film, which is applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problem of eutectic solvents with many steps, environmental pollution, and difficult separation and other problems, to achieve the effect of convenient separation, good adsorption effect and simple preparation process
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Embodiment 1
[0027] 10g chitosan is dissolved in 500ml water to form dispersion liquid, under stirring state, slowly drip the acetic acid solution that the volume fraction of 500ml is 2%, after chitosan dissolves completely, add the glycerol of chitosan consumption 10wt%, Stir for 0.5h, then centrifuge at 4500rpm for 8min to defoam, to obtain a chitosan pregel solution with a mass fraction of 1%;
[0028] The chitosan pregel solution obtained with a mass fraction of 1% was cast in a plexiglass mold, dried and formed at 40°C, and then the excess plasticizer in the film was washed with absolute ethanol and deionized water, Obtain chitosan film;
[0029] Soak the obtained chitosan film in 10% sodium hydroxide aqueous solution for 6 hours, take it out and dry it at 45°C for 4 hours, and then dry it in a drying oven at 90°C for 8 hours to obtain alkaline chitosan membrane.
[0030] Pour 100g of mineral oil to be treated into the reactor, add 1.5g of the alkaline chitosan film, stir slowly, an...
Embodiment 2
[0033] 15g chitosan is dissolved in 500ml water to form dispersion liquid, under stirring state, slowly drip the acetic acid solution that the volume fraction of 500ml is 2%, after chitosan dissolves completely, add the glycerol of chitosan consumption 20wt%, Stir for 1h, then centrifuge at 6000rpm for 8min to defoam, and obtain a chitosan pregel solution with a mass fraction of 1.5%;
[0034] The chitosan pregel solution obtained with a mass fraction of 1.5% was cast in a plexiglass mold, dried and formed at 50°C, and then the excess plasticizer in the film was washed with absolute ethanol and deionized water, Obtain chitosan film;
[0035] Soak the obtained chitosan film in an 8% sodium hydroxide aqueous solution for 6 hours, take it out and dry it at 50°C for 5 hours, and then dry it in a drying oven at 95°C for 7 hours to obtain alkaline chitosan membrane.
[0036] Pour 100g of mineral oil that needs to be processed into the reactor, add 2g of the alkaline chitosan film,...
Embodiment 3
[0039] 20g chitosan is dissolved in 500ml water to form dispersion liquid, under stirring state, slowly add dropwise the volume fraction of 500ml is 2% acetic acid solution, after chitosan dissolves completely, add the glycerol of chitosan consumption 15wt%, Stir for 0.5h, then centrifuge at 5000rpm for 8min to defoam, to obtain a chitosan pregel solution with a mass fraction of 2%;
[0040] The chitosan pregel solution obtained with a mass fraction of 2% was cast in a plexiglass mold, dried and formed at 45°C, and then the excess plasticizer in the film was washed with absolute ethanol and deionized water, Obtain chitosan film;
[0041] Soak the obtained chitosan film in an 8% sodium hydroxide aqueous solution for 6 hours, take it out and dry it at 50°C for 5 hours, and then dry it in a drying oven at 90°C for 8 hours to obtain alkaline chitosan membrane.
[0042] Pour 100g of mineral oil that needs to be processed into the reactor, add 3g of the alkaline chitosan film, sti...
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