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Environment-friendly preparation and liquid medicine recovery method of nano cellulose

A technology of nanocellulose and recovery method, which is applied in the field of environmental protection preparation of nanocellulose and liquid medicine recovery, and can solve problems such as large energy consumption and environmental pollution.

Pending Publication Date: 2021-09-03
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem of these preparation strategies is that they require a lot of energy, and the pretreatment will inevitably pollute the environment.

Method used

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  • Environment-friendly preparation and liquid medicine recovery method of nano cellulose
  • Environment-friendly preparation and liquid medicine recovery method of nano cellulose
  • Environment-friendly preparation and liquid medicine recovery method of nano cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 500mg strip-shaped metasequoia raw material, 15ml glacial acetic acid (17.5mol / L), and 15ml hydrogen peroxide (30wt%) into a 50ml stoppered test tube, soak for 48h at 60°C, stop heating to terminate the reaction, and let the metasequoia fiber stand still. Sink to the bottom, recover the upper solution, filter and wash the lower sediment with deionized water until the pH of the filtrate is weakly acidic, centrifuge to collect the fibers in the supernatant, and use a low-power ultrasonic cell pulverizer to process the precipitate again to obtain nanofibers white.

[0024] Add 18.4g of anhydrous copper sulfate powder to the recovered upper layer solution, and the anhydrous copper sulfate powder reacts with water to generate blue crystals of hydrated copper sulfate, which are precipitated. Finally, the high-concentration acetic acid solution and hydrated copper sulfate crystals are separated by filtration, and the hydrated copper sulfate crystals are heated and dehydrat...

Embodiment 2

[0026] Add 1000mg strip-shaped metasequoia raw material, 15ml glacial acetic acid (17.5mol / L), and 15ml hydrogen peroxide (30wt%) into a 50ml stoppered test tube, soak for 48 hours at 60°C, stop heating to terminate the reaction, and let the metasequoia fiber stand still. Sink to the bottom, recover the upper solution, filter and wash the lower sediment with deionized water until the pH of the filtrate is weakly acidic, centrifuge to collect the fibers in the supernatant, and use a low-power ultrasonic cell pulverizer to process the precipitate again to obtain nanofibers white.

[0027] Add 17.9g of anhydrous copper sulfate powder to the recovered upper layer solution, and the anhydrous copper sulfate powder reacts with water to form blue crystals of hydrated copper sulfate, which precipitates out. Finally, the high-concentration acetic acid solution and hydrated copper sulfate crystals are separated by filtration, and the hydrated copper sulfate crystals are heated and dehydr...

Embodiment 3

[0029] Add 500mg strip-shaped metasequoia raw material, 20ml glacial acetic acid (17.5mol / L), and 10ml hydrogen peroxide (30wt%) into a 50ml stoppered test tube, soak for 48h at 60°C, stop heating to terminate the reaction, and let the metasequoia fiber stand still Sink to the bottom, recover the upper solution, filter and wash the lower sediment with deionized water until the pH of the filtrate is weakly acidic, centrifuge to collect the fibers in the supernatant, and use a low-power ultrasonic cell pulverizer to process the precipitate again to obtain nanofibers white.

[0030] Add 12.3g of anhydrous copper sulfate powder to the recovered upper layer solution, and the anhydrous copper sulfate powder reacts with water to form blue crystals of hydrated copper sulfate, which precipitates out. Finally, the high-concentration acetic acid solution and hydrated copper sulfate crystals are separated by filtration, and the hydrated copper sulfate crystals are heated and dehydrated in...

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Abstract

The invention discloses an environment-friendly preparation and liquid medicine recovery method of nano cellulose. The method comprises the following operation steps: mixing a plant fiber raw material, glacial acetic acid (17.5 mol / L) and hydrogen peroxide with the mass concentration of 30%, soaking for 24-150 hours at the low temperature of 60 DEG C, stopping heating to terminate the reaction, standing to enable the raw material to sink to the bottom, and recovering an upper solution, filtering and washing a lower-layer precipitate with deionized water until the pH value of a filtrate is weakly acidic, and treating a precipitate part with a low-power ultrasonic cell crusher to obtain uniform nano cellulose; and adding anhydrous cupric sulfate powder into a recovered upper-layer solution until all water and copper sulfate are hydrated to generate copper sulfate pentahydrate crystals, and filtering and separating the copper sulfate pentahydrate and glacial acetic acid to realize cyclic utilization. The chemical products used in the invention have few types, are cheap and easily available, and can be efficiently and greenly recycled and reused.

Description

technical field [0001] The invention relates to an environment-friendly preparation method of nano-cellulose and a method for recovering liquid medicine, and belongs to the field of new nano-materials and the field of environment protection. [0002] technical background [0003] Nanocellulose refers to cellulose materials separated from fiber raw materials with at least one dimension in the nanoscale range. It not only has the properties of natural cellulose non-toxic, renewable and degradable, but also has the typical characteristics of nanomaterials, such as large specific surface area, high hydrophilicity, high transparency, high strength, high Young's modulus, low thermal expansion coefficient, etc. Advantages, can be widely used in many fields such as degradable plastic reinforcement, rheology modifier, thickener, etc. [0004] At present, nanocellulose is divided into rods, spheres, sheets and fibrils. Microcrystalline cellulose is treated with mixed acid of strong i...

Claims

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Application Information

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IPC IPC(8): D21H11/18D21C3/00
CPCD21H11/18D21C3/003
Inventor 宋君龙王清诚郭家奇
Owner NANJING FORESTRY UNIV