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Preparation method for microcrystalline cellulose

A technology of microcrystalline cellulose and waste residue, applied in the direction of pulping with inorganic alkali, pulp bleaching, etc., can solve problems such as air pollution, waste of cultivated land, and great environmental hazards, and achieve the effect of eliminating pollution and reducing costs

Inactive Publication Date: 2012-12-05
杜俊琪 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some enterprises have no choice but to find a large pit or abandoned land to store up the waste residue generated during the xylitol production process. in the air, causing serious air pollution
not only pollute the air, but also pollute the water
Especially with the development of society and the world's attention and attention to environmental issues, the country has intensified its monitoring of domestic environmental issues in recent years. Corn cob utilization companies increase investment in pollution control and environmental improvement, and production costs rise accordingly
[0010] As for microcrystalline cellulose production technology, its main technological process also uses processes similar to those in the pulp industry, such as high-temperature alkali cooking, sodium hypochlorite bleaching, acid treatment and other technological means. The water consumption is large, a large amount of sewage is produced, and sodium hypochlorite bleaching produces highly toxic dioxins, which are very harmful to the environment

Method used

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  • Preparation method for microcrystalline cellulose
  • Preparation method for microcrystalline cellulose
  • Preparation method for microcrystalline cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The waste residue in the xylitol production process is crushed and desanded, and then dehydrated by mechanical method until the water weight content is equal to 45%; take 100kg of the above-mentioned waste residue, add KOH and H 2 o 2 130kg of the mixed solution, wherein, KOH and H 2 o 2 The weight ratio of KOH is 3:1, the weight percentage of KOH is 8.8%, and the reaction is carried out at normal pressure and 60° C. for 5 minutes; after that, the reaction product is washed 5 times, wherein the washing liquid after the first washing is carried out Evaporating and concentrating to obtain potassium-containing organic compound fertilizers, the washing liquid produced in the 2nd to 5th washings is treated and recycled to the washing step for use as a detergent, and the water generated after the product is dehydrated is recycled to the washing step for use as a detergent; The product obtained by washing is dehydrated, dried and pulverized to obtain microcrystalline cellulo...

Embodiment 2

[0030] The waste residue in the xylitol production process is crushed and desanded, and then dehydrated by mechanical method until the water weight content is equal to 5%; take 100kg of the above-mentioned waste residue, add KOH and H 2 o 2 The mixed solution 145kg, wherein, KOH and H 2 o 2 The weight ratio of KOH is 1:1, the weight percentage of KOH is 2%, and the reaction is carried out at normal pressure and 90° C. for 3 minutes; after that, the reaction product is washed 5 times, wherein the washing liquid after the first washing is carried out Evaporating and concentrating to obtain potassium-containing organic compound fertilizers, the washing liquid produced in the 2nd to 5th washings is treated and recycled to the washing step for use as a detergent, and the water generated after the product is dehydrated is recycled to the washing step for use as a detergent; The product obtained by washing is dehydrated, dried and pulverized to obtain microcrystalline cellulose.

Embodiment 3

[0032] The waste slag in the xylitol production process is crushed and desanded, and then dehydrated by mechanical method until the water weight content is equal to 15%; take 100kg of the above-mentioned waste slag, add KOH and H 2 o 2 The mixed solution of 175kg, wherein, KOH and H 2 o 2 The weight ratio of KOH is 3:1, the weight percentage of KOH is 6%, and the reaction is carried out at normal pressure and 50°C for 8 minutes; after that, the reaction product is washed 3 times, wherein the washing solution after the first washing is carried out Evaporating and concentrating to obtain potassium-containing organic compound fertilizer, the washing solution produced in the 2nd to 3rd washing is processed and recycled to the washing step for use as a detergent, and the water generated after the product is dehydrated is recycled to the washing step for use as a detergent; ; The product obtained by washing is dehydrated, dried and pulverized to obtain microcrystalline cellulose. ...

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Abstract

The invention relates to a method for preparing microcrystalline cellulose by taking waste residues in the production process of xylitol as raw materials. The method is provided for the problems in the existing production process of the microcrystalline cellulose and the xylitol, and breaks through the conventional catalytic acid hydrolysis process. The waste residues can be turned into things of value by the method, and the method has the advantages of simple process, zero discharge of wastes, high product added value and the like. And meanwhile, the cost of the whole xylitol industry chain is reduced, and the problem of environmental pollution which restricts the industrial development is solved, and even the process of pollution is eliminated to achieve the purpose of clean production.

Description

technical field [0001] The invention relates to a method for preparing microcrystalline cellulose, in particular to a method for preparing microcrystalline cellulose by using waste residue in the xylitol production process as a raw material. Background technique [0002] Microcrystalline cellulose (MCC for short) is a linear polysaccharide bound by β-1,4 glucosidic bonds. White or nearly white powdery solid product. It is mainly composed of cellulose-based organic matter (about 99.95%) and microcrystalline inorganic matter (about 0.05%, such as ash). The main components of ash are Ca, Si, Mg, Al, Fe and other very trace metal elements. The particle size is generally 20-80μm, and the limiting degree of polymerization (LODP) is 15-375; it is not fibrous and has strong fluidity. Insoluble in water, dilute acids, organic solvents and oils, partially soluble and swelling in dilute alkali solutions, and has high reactivity in the process of carboxymethylation, acetylation and e...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C9/16
Inventor 杜俊琪
Owner 杜俊琪
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