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Method for preparing nano microcrystalline cellulose from wood ear residues

A technology of nano-cellulose and nano-crystal, which is applied in the field of preparation of nano-micro-crystal cellulose, can solve the problem of low conversion and utilization rate of waste bacteria residue, and achieve the effect of uniform dispersion

Pending Publication Date: 2022-01-21
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a method for preparing nano-microcrystalline cellulose by using fungus residues, which solves the shortcomings of low conversion utilization of waste residues, and formulates a low-cost agricultural residue conversion method. Using technology, the operation is simple, the time is short, and the conversion rate of waste bacteria residue is improved

Method used

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  • Method for preparing nano microcrystalline cellulose from wood ear residues
  • Method for preparing nano microcrystalline cellulose from wood ear residues
  • Method for preparing nano microcrystalline cellulose from wood ear residues

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Step 1. After soaking, high-temperature cooking and washing, the waste bacteria residues are removed to remove surface impurities. After drying, they are ground into a 60-mesh powder in a multifunctional pulverizer, wrapped with qualitative filter paper and soaked in toluene: ethanol (V:V) = In a 2:1 organic solvent, extract in a Soxhlet extractor at 110°C for 6 hours to remove organic matter such as fat and wax, filter and dry to obtain clean bacterial residue raw materials;

[0037] Step 2: Prepare a NaOH solution with a concentration of 10wt%, with a solid-to-liquid ratio of 1:20, g / ml, treat it in a water bath at 80°C for 2 hours to remove hemicellulose, and dry it in an oven at 60°C after suction filtration 12h;

[0038] Step 3, prepare 7.5wt% NaClO 2 Solution, mixed evenly with the crude fiber of the fungus residue, the solid-liquid ratio is 1:20, g / ml, adjust the pH of the solution at 3.8 with acetic acid, bleach in a 75°C water bath for 3 hours to remove the li...

Embodiment 2

[0042] Step 1. After soaking, high-temperature cooking and washing, the waste bacteria residues are removed to remove surface impurities. After drying, they are ground into a 60-mesh powder in a multifunctional pulverizer, wrapped with qualitative filter paper and soaked in toluene: ethanol (V:V) = In a 2:1 organic solvent, extract in a Soxhlet extractor at 110°C for 6 hours to remove organic matter such as fat and wax, filter and dry to obtain clean bacterial residue raw materials;

[0043] Step 2: Prepare a NaOH solution with a concentration of 10wt%, and mix it evenly with the raw material of the fungus residue. The solid-to-liquid ratio is 1:20, g / ml, and treat it in a water bath at 80°C for 2 hours to remove hemicellulose. Dry in an oven at 60°C for 12 hours;

[0044] Step 3, prepare 7.5wt% NaClO 2 Solution, mixed evenly with the crude fiber of fungus residue, solid-liquid ratio is 1:20, g / ml, adjust the pH of the solution at 3.9 with acetic acid, bleach in a 75°C water ...

Embodiment 3

[0048] Step 1. After soaking, high-temperature cooking and washing, the waste bacteria residues are removed to remove surface impurities. After drying, they are ground into a 60-mesh powder in a multifunctional pulverizer, wrapped with qualitative filter paper and soaked in toluene: ethanol (V:V) = In a 2:1 organic solvent, extract in a Soxhlet extractor at 110°C for 6 hours to remove organic matter such as fat and wax, filter and dry to obtain clean bacterial residue raw materials;

[0049] Step 2: Prepare a NaOH solution with a concentration of 10wt%, and mix it evenly with the raw material of the fungus residue. The solid-to-liquid ratio is 1:20, g / ml, and treat it in a water bath at 80°C for 2 hours to remove hemicellulose. Dry in an oven at 60°C for 12 hours;

[0050] Step 3, prepare 7.5wt% NaClO 2 Solution, mixed evenly with the crude fiber of the fungus residue, the solid-liquid ratio is 1:20, g / ml, the pH of the solution is adjusted to 4.0 with acetic acid, bleached i...

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Abstract

The invention relates to a method for preparing nano microcrystalline cellulose by using wood ear residues, which comprises the following steps of: 1, soaking waste wood ear residues, conducting cooking at high temperature, conducting washing with water to remove surface impurities, conducting drying, conducting grinding to form fungus residue powder, conducting soaking in a mixed solvent of toluene and ethanol to remove organic matter, carrying out suction filtration, and conducting drying to obtain a clean fungus residue raw material; 2, uniformly mixing the fungus residue raw material with a NaOH solution, removing hemicellulose, and performing suction filtration and drying to obtain mushroom dreg coarse cellulose; 3, uniformly mixing the mushroom dreg coarse cellulose with a NaClO2 solution, adjusting the pH value of the solution with acetic acid, conducting treating in a water bath kettle to remove lignin, and performing suction filtration and drying to obtain fungus residue cellulose; 4, performing acidolysis in a magnetic stirrer to obtain a milk white nano cellulose solution; and 5, washing the nano cellulose solution in a high-speed centrifuge by adding water until the pH value is weakly acidic, conducting dialyzing in deionized water, and performing vacuum freeze drying to obtain the relatively uniform elongated needle-like nanomicrocrystalline cellulose with the length of 14.14 nm.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing nano-microcrystalline cellulose by using fungus slag. Background technique [0002] As a natural polymer compound, cellulose has the characteristics of large reserves, wide distribution, and recycling, and is used in papermaking, feed, and building materials. Nano-microcrystalline cellulose refers to natural cellulose placed in different reaction systems, hydrolyzed by inorganic acid, destroying the amorphous region and low crystallinity region, and extracted by controlling the type and position of the functional group on the cellulose hydroxyl group. A cellulose crystal, which is a rod-shaped or ellipsoid-shaped polymer material with a diameter less than 100nm. Nanocrystalline cellulose can be extracted from green plants such as cotton fiber, bamboo fiber, banana fiber, wood, bagasse, etc. by physical or chemical methods, and is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/02
CPCC08B15/02
Inventor 宿健张小妹方长青杨曼楠
Owner XIAN UNIV OF TECH