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Method for preparing slow-release compound fertilizer with xylose waste residues

A slow-release compound fertilizer and xylose waste residue technology, applied in the direction of fertilizers made from biological waste, application, organic fertilizers, etc., can solve the problems of low effective utilization of common fertilizers, reduce irrigation frequency, reduce pollution, and facilitate transportation Effect

Inactive Publication Date: 2013-06-19
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for the low effective utilization rate of ordinary fertilizers is that they are easily soluble in water and quickly dissolve in water after being applied to the soil. Nutrients such as N, P, and K are released in a short period of time at a dose far greater than the amount that crops can absorb.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of method utilizing xylose waste residue to prepare slow-release compound fertilizer, the steps are as follows:

[0029] (1) Mix 150 g of xylose waste residue (dry weight) with 100 g of potassium hydroxide, add 250 g of water, stir for 3 hours at a temperature of 30° C., and carry out alkalization reaction to obtain alkalized waste residue;

[0030] (2) Add 100 g of chloroacetic acid to the alkalized waste residue prepared in step (1), mix well, heat up to 65° C., stir for 2.5 hours, and carry out etherification reaction, adjust the pH to 6.5 with phosphoric acid to obtain etherified waste residue;

[0031] (3) Squeeze and separate the etherified waste residue obtained in step (2) to obtain separated liquid A and etherified waste residue; the apparent viscosity of the reaction system is 140 mPa.s, and the main component of separated liquid A is carboxymethylcellulose potassium aqueous solution , The degree of substitution of carboxymethyl cellulose is 0.95.

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Embodiment 2

[0039] A kind of method utilizing xylose waste residue to prepare slow-release compound fertilizer, the steps are as follows:

[0040](1) Mix 100 g of xylose waste residue (dry weight) with 70 g of potassium hydroxide, add 170 g of water, stir for 3 hours at a temperature of 30° C., and carry out alkalization reaction to obtain alkalized waste residue;

[0041] (2) Add 65 g of chloroacetic acid to the alkalized waste residue prepared in step (1), mix evenly, heat up to 65° C., stir for 2.5 hours, and carry out etherification reaction, and adjust the pH to 6.5 with phosphoric acid to obtain etherified waste residue;

[0042] (3) Squeeze and separate the etherified waste residue obtained in step (2) to obtain separated liquid A and etherified waste residue; the apparent viscosity of the reaction system is 135mPa.s, and the main component of separated liquid A is carboxymethylcellulose potassium aqueous solution , The degree of substitution of carboxymethyl cellulose is 0.93.

...

Embodiment 3

[0050] A kind of method utilizing xylose waste residue to prepare slow-release compound fertilizer, the steps are as follows:

[0051] (1) Mix 300 g of xylose waste residue (dry weight) with 220 g of potassium hydroxide, add 530 g of water, stir for 3 hours at a temperature of 30° C., and carry out alkalization reaction to obtain alkalized waste residue;

[0052] (2) Add 65 g of chloroacetic acid to the alkalized waste residue prepared in step (1), mix evenly, heat up to 65° C., stir for 2.5 hours, and carry out etherification reaction, and adjust the pH to 6.5 with phosphoric acid to obtain etherified waste residue;

[0053] (3) Squeeze and separate the etherified waste residue obtained in step (2) to obtain separated liquid A and etherified waste residue; the apparent viscosity of the reaction system is 150 mPa.s, and the main component of separated liquid A is carboxymethylcellulose potassium aqueous solution , The degree of substitution of carboxymethyl cellulose is 0.92. ...

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Abstract

The invention relates to a method for preparing a slow-release compound fertilizer with xylose waste residues. Composed of the steps of alkalization, etherification, ammoniation, and granulation, the method can prepare a slow-release compound fertilizer with a nitrogen fertilizer content of 20-25 wt%, a phosphorus content of 7-10 wt% (in terms of P2O5), a potassium content of 6-9 wt% (in terms ofK2O), and a total nutrient content of 35-45 wt%. The slow-release compound fertilizer has extremely low loss rate, as well as strong plasticity and settability. In addition, after slow microbial decomposition, the lignin and cellulose contained in the slow-release compound fertilizer has no pollution to the environment, and can increase soil humus, thus having very good effects on improving poor soil and deserted soil.

Description

technical field [0001] The invention relates to a method for preparing a moldable slow-release compound fertilizer with strong water holding capacity by utilizing xylose waste residue, and belongs to the technical field of slow-release compound fertilizers. Background technique [0002] In the process of xylose production, its main raw material is corn cob, after purification, hydrolysis, decolorization, neutralization, ion exchange, concentration, and crystallization processes, the finished xylose is finally obtained. Corncobs are rich in hemicellulose, cellulose, and lignin. After treatment, most of the hemicellulose is converted into xylose, while the cellulose and lignin are almost not destroyed, and still exist in the xylose residue. my country's xylose production capacity exceeds 10,000 tons, and the current production of 1 ton of xylitol requires an average of 8 tons of corn cobs. 80,000 tons of corncobs are needed every year, and the amount of xylose waste residue p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F5/00
CPCY02A40/20
Inventor 王腾飞王瑞明李丕武马春玲
Owner QILU UNIV OF TECH