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Method for coproduction of cellulose, active carbon and compound fertilizer from plant stalk

A plant straw and cellulose technology, which is applied in fiber raw material processing, chemical instruments and methods, fertilization devices, etc., can solve the problems of environmental pollution and high pollution control costs, and achieves solutions to environmental pollution, comprehensive pollution index reduction, and comprehensive utilization rate. improved effect

Inactive Publication Date: 2011-10-26
JIAHE BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional process often adopts chemical method, using the mixture of sodium hydroxide and sodium sulfide as the cooking agent. The waste liquid after cooking is directly discharged without rational use, and contains a large amount of chlorine, sulfur, sodium, etc., causing serious environmental pollution. The cost of pollution control is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 1 ton of wheat straw, 7 tons of water, and 21 kg of lignin eluting agent into a stainless steel container, heat to 80 degrees Celsius, and react for 7 hours. After the reaction is complete, filter the crude cellulose, wash, bleach, dehydrate by pressing, and dry. Obtain 0.3 tons of cellulose finished product. Among them, the cleaning and bleaching solution flows into the stainless steel container for reuse. Acidify the mixed solution of the crude cellulose that has been extracted, and the precipitated solids are 0.15 tons of lignin, which is pressed and dried to obtain 0.08 tons of activated carbon through carbonization and activation. Concentrate the remaining liquid after precipitation, spray dry and granulate to obtain 0.2 tons of compound fertilizer. The lignin stripping agent consists of 7-8 parts of potassium phosphate, 1.9-2.9 parts of potassium permanganate and 0.1 part of wood penetrating agent by mass.

Embodiment 2

[0018] Put 1 ton of corn stalks, 7.5 tons of water, and 15 kg of lignin solvent into a stainless steel container, soak and react at 85°C for 5 hours. After the reaction is complete, the crude cellulose product is obtained by filtration. After washing, bleaching, dehydration by pressure filtration, and drying, 0.38 tons of finished cellulose product are obtained. Among them, the cleaning and bleaching solution flows into the stainless steel container for reuse. Acidify the mixed solution of the crude cellulose that has been extracted, and the precipitated solid is lignin, about 0.2 tons. After being pressed and dried, activated carbon is obtained by carbonization and activation. Concentrate the remaining liquid after precipitation, spray dry and granulate to obtain 0.19 tons of compound fertilizer. The composition of the lignin stripping agent is the same as in Example 1.

Embodiment 3

[0020] Put 1 ton of sawdust into a stainless steel container with 6.5 tons of water and 20 kg of lignin solvent, and react at a temperature of 90°C under normal pressure for 6 hours. The crude cellulose product was filtered, washed, bleached, dehydrated by pressure filtration, and dried to obtain 0.35 tons of cellulose finished product. Among them, the cleaning and bleaching solution flows into the stainless steel container for reuse. Acidify the mixed solution of the crude cellulose that has been extracted, and the precipitated solid is 0.18 tons of lignin, which is pressed and dried to obtain activated carbon through carbonization and activation. Concentrate the remaining liquid after precipitation, spray dry and granulate to obtain 0.21 tons of compound fertilizer.

[0021] When cotton stalks are used as raw materials, bast fibers need to be separated before cellulose extraction, and the finished fibers are obtained by rinsing, refining, and drying. Other processes are th...

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Abstract

The invention provides a method for co-producing cellulose, active carbon and composite fertilizer from plant straw, which comprises the following steps: putting the material and lignin dissolving agent contained aqueous solution into a boiling pot according to the mass ratio of 1:6-8, where, the lignin dissolving agent is 1-5% weight of the aqueous solution; heating to 60-90 degrees centigrade under atmospheric pressure and keeping for 4-8 hours; dissolving out the lignin and filtering to obtain cellulose bullion; cleaning, bleaching, press filtering, dehydrating and drying the cellulose bullion to obtain the finished cellulose product; acidifying the mixed liquor after cellulose bullion extraction; depositing out the solid that is lignin and fine fibers; taking out the deposited solid, pressing drying, delivering to active carbon workshop for carbonizing and activating to obtain active carbon; concentrating the residue liquid after solid deposition, drying and granulating to obtain the composite fertilizer. Besides the cellulose, the invention can co-produce active carbon and composite fertilizer, changes improves the abuses of single product, water resource waste and serious environment pollution existing in the current technologies.

Description

Technical field: [0001] The invention relates to a method for co-producing cellulose, activated carbon and compound fertilizer by using plant straw as raw material. Straw includes wheat straw, rice straw, corn stalks, cotton stalks, sawdust, etc. Background technique: [0002] my country is a large agricultural country, which produces nearly 1 billion tons of crop straw, bark, shell, core, fruit sawdust, and usable reeds and straws every year. There are various processing and utilization technologies: straw crushing and returning to the field; straw making cellulose ( pulp), organic fertilizer, activated carbon or feed produced from straw; power generation from straw; gasification of straw; , low value-added processing, serious "three wastes" in the processing process, poor direct and social benefits for enterprises, and small direct benefits for farmers. Therefore, the problem that the crop stalks are still largely abandoned and burned cannot be solved as a whole. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00C07G1/00C05G1/00
Inventor 任宪君
Owner JIAHE BIOTECH
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