Microcrystalline cellulose and method for preparing microcrystalline cellulose using crop straw
A technology of microcrystalline cellulose and crop straw, applied in the field of resources and environment, can solve the problems of unfavorable large-scale deep processing and transformation and utilization, corrosiveness and large amount of waste liquid, and high post-treatment cost, so as to reduce environmental pollution and equipment. Corrosion, easy recovery, and small damage to solid acid
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Embodiment 1
[0036] Add the mixed solvent of wheat straw powder, N-methylpyrrolidone and water (the volume ratio of N-methylpyrrolidone and water is 1:2), sulfuric acid (so that the concentration in the solution is 0.05M) into the autoclave , wherein the weight ratio of wheat straw powder and mixed solvent is 1:6, heated to 180°C, stirred for 4h, cooled to room temperature, centrifuged and suction filtered to obtain filtrate and solid product. The solid product was washed with the same above-mentioned mixed solvent, the washing liquid and the filtrate were combined, the filtrate was extracted with chloroform, and the organic solvent was recovered. The solid product is wheat straw crude cellulose with a purity of 75.3%. Put the wheat straw crude cellulose into the round bottom flask, and then add the prepared mixed solution containing 4wt% sodium carbonate and 2wt% hydrogen peroxide. The weight ratio of the wheat straw crude cellulose to the mixed solution is 1:7.5.70 Heat and stir at ℃ fo...
Embodiment 2
[0038]Add the mixed solvent of wheat straw powder, N-methylpyrrolidone and water (the volume ratio of N-methylpyrrolidone and water is 1:1), sulfuric acid (so that the concentration in the solution is 0.03M) into the autoclave , wherein the weight ratio of wheat straw powder and mixed solvent is 1:8, heated to 190°C, stirred for 6h, cooled to room temperature, centrifuged, and suction filtered to obtain filtrate and solid product. The solid product was washed with the same above-mentioned mixed solvent, the washing liquid and the filtrate were combined, the filtrate was extracted with chloroform, and the organic solvent was recovered. The solid product is wheat straw crude cellulose with a purity of 79.7%. Put the wheat straw crude cellulose into the round bottom flask, and then add the prepared mixed solution containing 4wt% sodium carbonate and 2wt% hydrogen peroxide. The weight ratio of the wheat straw crude cellulose to the mixed solution is 1:7.5.70 Heat and stir at ℃ fo...
Embodiment 3
[0040] Add the mixed solvent of wheat straw powder, N-methylpyrrolidone and water (the volume ratio of N-methylpyrrolidone and water is 1:1), sulfuric acid (so that the concentration in the solution is 0.03M) into the autoclave , wherein the weight ratio of wheat straw powder and mixed solvent is 1:8, heated to 190°C, stirred for 6h, cooled to room temperature, centrifuged, and suction filtered to obtain filtrate and solid product. The solid product was washed with the same above-mentioned mixed solvent, the washing liquid and the filtrate were combined, the filtrate was extracted with chloroform, and the organic solvent was recovered. The solid product is wheat straw crude cellulose with a purity of 79.7%. Put the wheat straw crude cellulose into the round bottom flask, and then add the prepared mixed solution containing 6wt% sodium carbonate and 1wt% hydrogen peroxide. The weight ratio of the wheat straw crude cellulose to the mixed solution is 1:7.5.60 Heat and stir at ℃ f...
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