Method for degrading cellulose by synergic action of mechanical activation and metal salt

A technology of degrading cellulose and mechanical activation, applied in the field of mechanical activation and synergistic metal salt degrading cellulose, can solve the problems of reducing the degree of polymerization of cellulose, shortening the pretreatment time, and long production cycle, so as to reduce the degree of polymerization and shorten the pretreatment. time and efficiency

Inactive Publication Date: 2015-04-01
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for mechanically activating and synergistically degrading cellulose with metal salts, which can overcome the complex process, high energy consumption, easy to cause environmental pollution, long production cycle and high equipment requirements in the production process existing in the existing cellulose degradation technology. Insufficient, to achieve the purpose of shortening the pretreatment time but effectively reducing the degree of polymerization (Degree of Polymerization, DP) of cellulose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Crush the cotton cellulose raw material with DP=1010, pass through a 10-mesh sieve, and then mix 20 g of the broken cotton cellulose raw material with the metal salt AlCl 3 Add 0.2g into the mixer, mix well, then put the uniformly mixed material into a roller ball mill with a constant temperature system, ball mill at a mechanical activation temperature of 50°C for 30min, take it out, separate the material balls, and obtain DP=224 Cellulose degradation products.

Embodiment 2

[0037] Crush the cotton cellulose raw material with DP=1010, pass through a 20-mesh sieve, and then mix 20 g of the broken cotton cellulose raw material with metal salt FeCl 3 Mix 0.12 g manually, then put the uniformly mixed material into an agitating ball mill with a constant temperature system, ball mill at a mechanical activation temperature of 90°C for 60 minutes, take it out, separate the material balls, and obtain a cellulose degradation product with DP=117 .

Embodiment 3

[0039] The cotton cellulose raw material with DP=1010 is crushed, passed through a 40 mesh sieve, and then 20 g of the crushed cotton cellulose raw material is mixed with metal salt Al(NO 3 ) 3 Add 0.06g and 0.04g of NaCl into the mixer, mix evenly, then put the uniformly mixed material into a roller ball mill with a constant temperature system, ball mill at a mechanical activation temperature of 70°C for 60 minutes, take it out, separate the balls, and get Cellulose degradation products with DP=109.

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PUM

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Abstract

The invention discloses a method for degrading cellulose by synergic action of mechanical activation and a metal salt, belonging to the field of biomass energy and fiber chemicals. The method comprises the following steps: (1) crushing cellulose which serves as a raw material, and screening with a screen of 10-200mesh; (2) mixing the crushed and screened cellulose with a metal salt at a weight ratio of 1:(0.001-0.1) uniformly; and (3) adding the materials mixed uniformly into a mechanical activation reactor, adjusting the mechanical activation temperature to 30-90 DEG C, activating the materials mechanically for 10-180 minutes, and taking the obtained cellulose degradation product out of the mechanical activation reactor. Because the cellulose is degraded by synergic action of mechanical activation and the metal salt, the degree of polymerization of the cellulose can be reduced greatly in a mild condition, the accessibility and the reaction activity of the cellulose degradation product can be improved greatly, and hydrolysis and modification reaction of cellulose can be realized. Little energy is consumed in the whole reaction process, the process for degrading cellulose is simple, the production cycle is short, the cellulose is degraded only under the mechanical force of a ball mill, and the requirement for production equipment is low.

Description

technical field [0001] The invention belongs to the field of biomass energy and fiber chemicals, and in particular relates to a method for mechanically activating and coordinating metal salts to degrade cellulose. Background technique [0002] Cellulose is mainly synthesized by plants through photosynthesis, and is an inexhaustible and renewable resource in nature. Cellulose has good biodegradability, biocompatibility, stability and special mechanical properties, and has the characteristics of non-toxic, harmless, cheap and huge output. In recent years, with the decline of oil and coal reserves and the rapid increase of oil prices, as countries pay more and more attention to environmental pollution, cellulose is considered to be the most likely green biological resource to replace oil. Synthesizing biomass energy and bio-based chemicals starting from cellulose, gradually establishing a bio-refining economic model, combined with petroleum refining, and realizing the integrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/00
Inventor 张燕娟黄祖强胡华宇冯振飞黄爱民杨梅覃宇奔覃杏珍李志霞朱园勤沈芳
Owner GUANGXI UNIV
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