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Full component separation for cell wall of agricultural refuse

A technology for the separation of agricultural waste and its separation method, which is applied in the field of separation of all components of cell walls in agricultural waste. It can solve the problems of low reactivity, incomplete structure of cellulose, and difficulty in further utilization, so as to shorten the separation time and increase the yield. , The effect of eliminating secondary environmental pollution

Inactive Publication Date: 2006-05-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Using acid solution to separate the components of agricultural waste, due to the acid hydrolysis of glycosidic bonds, cellulose with incomplete structure can be obtained, while hemicellulose is degraded into oligosaccharides and monosaccharides, and lignin is also severely degraded and occurs Highly condensed, very low reactivity, difficult to further use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Dried wheat stalks were cut into small pieces, ground, and the part that passed through a 5mm sieve was taken, placed in an oven at 50°C to keep air circulation and dried for 16 hours, and then heated with 2% H at 45°C and pH 14. 2 o 2 After processing for 6 hours, filter to obtain undissolved matter 1 and filtrate 1; undissolved matter 1 is crude cellulose, which still contains a relatively large amount of hemicellulose and lignin;

[0030] (2) Use 2.5% H at 45°C and pH 14 2 o 2 Treat undissolved matter 1 for 7 hours, filter to obtain undissolved matter 2 and filtrate 2; use 80% acetic acid-8% HNO at 110°C 3 Treat undissolved matter 2 (solid-liquid ratio 1:10, g / ml) for 40 minutes, filter to obtain undissolved matter 3 and filtrate 3, undissolved matter 3 is cellulose; filtrate 3 is concentrated to recover acetic acid and nitric acid, and the residue It is a mixture of a small amount of phenol, aldehyde and acid;

[0031] (3) After mixing filtrate 1 and filtrat...

Embodiment 2

[0035] (1) The bagasse is cut into small pieces after being dried in the sun, ground, and the part passing through the 8mm sieve is taken, placed in a 60°C oven to keep the air circulation dry for 12h, and then heated with 1.5% H at 65°C and pH 12.5. 2 o 2 After processing for 6 hours, filter to obtain undissolved matter 1 and filtrate 1; undissolved matter 1 is crude cellulose, which still contains a relatively large amount of hemicellulose and lignin;

[0036] (2) Use 1.5% H at 65°C and pH 12.5 2 o 2 Treat undissolved matter 1 for 8 hours, filter to obtain undissolved matter 2 and filtrate 2; use 80% acetic acid-8% HNO at 130°C 3 Treat undissolved matter 2 (solid-liquid ratio 1:8, g / ml) for 20 minutes, filter to obtain undissolved matter 3 and filtrate 3, undissolved matter 3 is cellulose; filtrate 3 is concentrated to recover acetic acid and nitric acid, and the residue It is a mixture of a small amount of phenol, aldehyde and acid;

[0037] (3) After mixing filtrate 1 ...

Embodiment 3

[0041] (1) After drying, the rice straw was cut into small pieces, ground, and the part that passed through the 6mm sieve was taken, and placed in an oven at 55°C to keep the air circulation dry for 14h, and then heated with 2% H at 50°C and pH 12. 2 o 2 Treat for 8 hours, filter to obtain undissolved matter 1 and filtrate 1; undissolved matter 1 is crude cellulose, which still contains a relatively large amount of hemicellulose and lignin;

[0042] (2) Use 2.5% H at 55°C and pH 12.5 2 o 2 Treat undissolved matter 1 for 6 hours, filter to obtain undissolved matter 2 and filtrate 2; use 80% acetic acid-8% HNO at 120°C 3 Treat undissolved matter 2 (solid-to-liquid ratio 1:12, g / ml) for 20 minutes, filter to obtain undissolved matter 3 and filtrate 3, undissolved matter 3 is cellulose; filtrate 3 is concentrated to recover acetic acid and nitric acid, and the residue It is a mixture of a small amount of phenol, aldehyde and acid;

[0043] (3) After mixing filtrate 1 and filtr...

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Abstract

A separation method of the cell wall constituent in the agricultural waste material is to treat the waste material by the low-density hydrogen peroxide in the special alkaline. So it can dissolve the much hemicellulose and the lignin then to purify the cellulose; while to separate and purify the hemicelluloses and the lignin by the organic solvent. Because of this, we can get the cellulose, hemicelluloses and the lignin. The process doesní»t need to add the sodium hypochlorite so it can improve the productivity and avoid the second environmental contamination.

Description

technical field [0001] The invention belongs to the field of component separation of agricultural waste, and in particular relates to a method for separating all components of cell walls in agricultural waste. Background technique [0002] Agricultural waste is an important biomass resource and a product of photosynthesis, which has many advantages such as large output, renewable, short regeneration cycle, biodegradable, and environmentally friendly. According to statistics, my country's annual agricultural straw output exceeds 600 million tons. The traditional utilization methods of agricultural waste are as fertilizer (such as returning straw to the field), feed (such as crushing corn stalks as feed), energy (most of them are directly burned to produce heat), etc. In our country, the use of agricultural waste in these fields only accounts for about 50% of the total. Due to the lack of transformation and utilization, more than 300 million tons of agricultural waste are sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00C08B37/14C08H7/00
Inventor 孙润仓刘传富刘凤孙金霞任俊莉
Owner SOUTH CHINA UNIV OF TECH
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