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Non-chlorine bleaching process for rice husk and other natural agricultural and sideline product rejected materials such as straw and corncob

A technology for agricultural and sideline products and corn cob, applied in the field of non-chlorine bleaching process, can solve problems such as incompatibility, achieve the effect of solving color problems and being beneficial to environmental protection

Inactive Publication Date: 2004-04-14
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological or enzymatic bleaching of fibrous agricultural and sideline product wastes such as rice husks, straws, and corn cobs reported abroad has high technical and equipment requirements, and is not suitable for my country's national conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add a certain weight of rice husks processed into 50 meshes, that is, rice husks, by adding 3-5 times the amount of water to make a slurry, adjust the pH to 2-3 with 2mol / L sulfuric acid solution, heat to 60-85°C under constant stirring, and keep warm for 0.5 -2h, then add 0.2-0.5% EDTA (ethylenediaminetetraacetic acid disodium salt) chelating agent to the total slurry, and keep stirring for 0.5-2h at 60-85°C.

[0017] Lower the temperature of the solution to about 60-65°C, then add 1-2.5% sodium silicate buffer, 0.1-1.0% magnesium sulfate stabilizer, and 2-5% hydrogen peroxide (30% solution) to the total slurry in sequence, Or 1.4-3.5% sodium peroxide, after it is fully dissolved and mixed evenly, adjust the pH value of the slurry to 10-11 with 15% sodium hydroxide solution or 2mol / L sulfuric acid solution, keep warm at 60-85°C, and stir for 1- 3h.

[0018] After the reaction is finished, the bleached rice husk is washed, left standing, filtered and dried to obtain th...

Embodiment 2

[0020] Add a certain weight of corn stalks processed into 40 meshes and add 3-5 times the amount of water to make a slurry, adjust the pH to 2-3 with 2mol / L sulfuric acid solution, heat it to 60-85°C under constant stirring, and keep it warm for 0.5-2h. Then add 0.2-0.5% of EDTA chelating agent to the total slurry, and keep stirring for 0.5-2h at 60-85°C.

[0021] Lower the temperature of the solution to about 60-65°C, then add 1-2.5% sodium silicate buffer, 0.1-1.0% magnesium sulfate stabilizer, and 2-5% hydrogen peroxide (30% solution) to the total slurry in sequence, Or 1.4-3.5% sodium peroxide, after it is fully dissolved and mixed evenly, adjust the pH value of the slurry to 10-11 with 15% sodium hydroxide solution or 2mol / L sulfuric acid solution, keep warm at 60-85°C, and stir for 1- 3h.

[0022] After the reaction, the bleached corn stalks are washed, left standing, filtered and dried to obtain the bleached corn stalks with a yield of about 85-90%. Since the water co...

Embodiment 3

[0024] Process a certain weight of corncobs into 40-50 mesh, add 3-5 times the amount of water to make a slurry, adjust the pH to 2-3 with 2mol / L sulfuric acid solution, heat to 60-85°C under constant stirring, and keep it warm for 0.5-2h , and then add 0.2-0.5% of EDTA chelating agent to the total slurry, and keep stirring for 0.5-2h at 60-85°C.

[0025] Lower the temperature of the solution to about 60-65°C, then add 1-2.5% sodium silicate buffer, 0.1-1.0% magnesium sulfate stabilizer, and 2-5% hydrogen peroxide (30% solution) to the total slurry in sequence, Or 1.4-3.5% sodium peroxide, after it is fully dissolved and mixed evenly, adjust the pH value of the slurry to 10-11 with 15% sodium hydroxide solution or 2mol / L sulfuric acid solution, keep warm at 60-85°C, and stir for 1- 3h.

[0026] After the reaction is finished, the bleached corncob powder is washed, left standing, filtered and dried to obtain the bleached corncob powder with a yield of about 85-90%. Since the ...

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PUM

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Abstract

The invention refers to the non-chlorine bleaching to rice husks and other waste such as straw, cob etc. The invention doesní»t use chlorine-containing bleacher in the bleaching period, but uses peroxide or sodium peroxide, in a fixed pH value and temperature range, with some chelator, buffering agent, and stabilizer, carries on the bleach, it can decrease the contamination. The product can be used for producing the once-and-for-all decomposable plate, dinner service.

Description

technical field [0001] The invention belongs to the field of processing and application of natural agricultural by-product waste, and also belongs to the field of biodegradable environmental protection materials. Specifically, the invention relates to a non-chlorine bleaching process of rice husks, that is, rice husks, and other natural agricultural by-product wastes such as straws and corncobs. technical background [0002] Although agricultural and sideline product wastes such as rice husks, straw, and corncobs contain more cellulose and hemicellulose, they cannot be used to make pulp and paper because of the amount and quality of the cellulose contained. Usually burned as fuel or used as roughage for livestock, animals or shredded and returned to fields to improve cropland structures. These agricultural and sideline product wastes can be completely biodegraded, and are a major resource of biodegradable environmental protection materials, which have not been fully utilize...

Claims

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Application Information

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IPC IPC(8): B27K5/02B27K9/00
Inventor 傅相锴牛丽明杨新斌傅宏
Owner SOUTHWEST UNIVERSITY
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