Nano cellulose prepared through catalyzing formic acid to hydrolyze by using metal salt and preparation method of nano cellulose
A technology of nanocellulose and metal salt, which is applied in the field of natural polymer material preparation, can solve the problems of unrecyclable catalyst, low reaction efficiency and environmental pollution.
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Embodiment 1
[0114] Weigh 3 g of dry bleached eucalyptus pulp and 0.45 g of anhydrous tin chloride into a 250 mL round bottom flask, add 100 mL of 60% (w / w) formic acid aqueous solution, and stir magnetically at 55° C. for 5 h. After the reaction, the flask was quickly placed in a cold water bath to cool to room temperature, and then the reaction mixture was transferred into a centrifuge tube and centrifuged at 8000 rpm for 5 min. The supernatant obtained after centrifugation, that is, the hydrolyzate, can be directly returned to prepare the next batch of nanocellulose. The precipitate obtained after centrifugation and the precipitated colloid are centrifuged and washed with distilled water until neutral, and the precipitate after centrifugation is the prepared product, which is freeze-dried to obtain nanocellulose crystals. The yield of nanocellulose obtained in the present embodiment is 85% (relative to the original dry bleached eucalyptus pulp), and the crystallinity is increased to 92% o...
Embodiment 2
[0116] Weigh 2 g of dry bleached eucalyptus pulp and 0.4 g of anhydrous silver nitrate into a 250 mL round bottom flask, add 100 mL of 60% (w / w) formic acid aqueous solution, and stir magnetically at 55° C. for 5 h. After the reaction, the flask was quickly placed in a cold water bath to cool to room temperature, and then the reaction mixture was moved into a centrifuge tube and centrifuged at 5000 rpm for 10 min. The hydrolyzate can be directly reused to prepare the next batch of nanocellulose. The precipitated jelly is centrifuged and washed with distilled water until neutral, and the centrifuged product is freeze-dried to obtain nanocellulose crystals. The yield of nanocellulose produced in this example is 82% (relative to the original dry bleached eucalyptus pulp), and the crystallinity is increased from 65% of the original slurry (Pulp) to 93% of nanocellulose (CNC).
Embodiment 3
[0118] Weigh 3 g of absolute dry corn cob cellulose and 0.6 g of nickel nitrate into a 250 mL round bottom flask, add 100 mL of 50% (w / w) formic acid solution, and magnetically stir at 55° C. for 5 h. After the reaction, the flask was quickly placed in a cold water bath to cool to room temperature, and then the reaction mixture was moved into a centrifuge tube and centrifuged at 5000 rpm for 15 min. The hydrolyzate can be directly reused to prepare the next batch of nanocellulose. The precipitated jelly is centrifuged and washed with distilled water until neutral, and the centrifuged product is freeze-dried to obtain nanocellulose crystals. The yield of nanocellulose prepared in this example was 92% (relative to the original dry corn cob cellulose), and the crystallinity increased from 59% of the original slurry to 95% of nanocellulose (CNC). Example 4
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