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Lignin-based slow-release nitrogen fertilizer as well as preparation method and application thereof

A lignin-based, lignin-based technology is applied in the field of lignin-based slow-release nitrogen fertilizer and its preparation, can solve the problems of use, low nitrogen content, and cannot be used as slow-release nitrogen fertilizer, etc., and achieves high nitrogen grafting rate, organic nitrogen The effect of high content and improving utilization value

Pending Publication Date: 2020-12-08
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the low nitrogen content of existing lignin and the defects or deficiencies that cannot be used as slow-release nitrogen fertilizer, and provide a preparation method of lignin-based slow-release nitrogen fertilizer

Method used

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  • Lignin-based slow-release nitrogen fertilizer as well as preparation method and application thereof
  • Lignin-based slow-release nitrogen fertilizer as well as preparation method and application thereof
  • Lignin-based slow-release nitrogen fertilizer as well as preparation method and application thereof

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Embodiment 1

[0060] This embodiment provides a method for preparing lignin-based slow-release nitrogen fertilizer by microwave heating, and its specific steps are:

[0061] Under continuous stirring, firstly, fully dissolve 2 g of phenolized lignin in 40 mL of 1 mol / L sodium hydroxide solution. Next, 6 g of ethylenediamine and 8 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixed solution was placed in a microwave reactor, and the microwave power was adjusted to 400W, and reacted at 70° C. for 25 minutes. After the reaction, a lignin-based slow-release nitrogen fertilizer was obtained.

[0062] The infrared spectrum of the lignin-based slow-release nitrogen fertilizer prepared in this embodiment is as follows: figure 1 As shown in (L1), the organic nitrogen content is as figure 2 (L1) shown. It can be seen from the figure that N is effectively incorporated into the molecular structure of the prepared lignin-based slow-release nitrogen fert...

Embodiment 2

[0064] This embodiment provides a method for preparing lignin-based slow-release nitrogen fertilizer by microwave heating, and its specific steps are:

[0065] Under continuous stirring, firstly, fully dissolve 2 g of phenolized lignin in 40 mL of 1 mol / L sodium hydroxide solution. Next, 8 g of ethylenediamine and 8 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixed solution was placed in a microwave reactor, and the microwave power was adjusted to 400W, and reacted at 70° C. for 40 minutes. After the reaction, a lignin-based slow-release nitrogen fertilizer was obtained.

[0066] The infrared spectrum of the lignin-based slow-release nitrogen fertilizer prepared in this embodiment is as follows: figure 1 As shown in (L2), the organic nitrogen content is as figure 2 (L2) shown. It can be seen from the figure that N is effectively inserted into the molecular structure of the prepared lignin-based slow-release nitrogen fertiliz...

Embodiment 3

[0068] This embodiment provides a method for preparing lignin-based slow-release nitrogen fertilizer by microwave heating, and its specific steps are:

[0069] Under continuous stirring, firstly, fully dissolve 2 g of phenolized lignin in 40 mL of 1 mol / L sodium hydroxide solution. Next, 6 g of ethylenediamine and 8 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixed solution was placed in a microwave reactor, and the microwave power was adjusted to 400W, and reacted at 60° C. for 40 minutes. After the reaction, a lignin-based slow-release nitrogen fertilizer was obtained.

[0070] The infrared spectrum of the lignin-based slow-release nitrogen fertilizer prepared in this embodiment is as follows: figure 1 As shown in (L3), the organic nitrogen content is as figure 2 (L3) shown. It can be seen from the figure that N is effectively inserted into the molecular structure of the prepared lignin-based slow-release nitrogen fertiliz...

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Abstract

The invention provides a lignin-based slow-release nitrogen fertilizer as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, performing phenolation modification on lignin to obtain phenolated lignin; and S2, dissolving the phenolated lignin in an alkaline solution, then mixing with an aminating agent and an aldehyde solution to obtain amixed solution, and reacting under the microwave conditions that the temperature is 60-80 DEG C and the power is 350-450 W to obtain the lignin-based slow-release nitrogen fertilizer. According to themethod, phenolic substances are introduced into the structure of lignin through phenolation modification, so that the content of active sites of lignin is remarkably increased; and grafting nitrogenin the aminating agent into a lignin structure by chemical bond combination through a Mannich modification reaction under a microwave condition to obtain the lignin-based slow-release nitrogen fertilizer. The prepared lignin-based slow-release nitrogen fertilizer is high in nitrogen grafting rate and high in organic nitrogen content; after being applied to soil, the slow-release fertilizer can begradually degraded under the action of microorganisms so as to slowly release nutrients, so that a slow-release effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of slow-release fertilizers, in particular to a lignin-based slow-release nitrogen fertilizer and its preparation method and application. Background technique [0002] Since the early 1970s, the input of nitrogen fertilizer in my country's agriculture has increased rapidly. However, the seasonal utilization rate of nitrogen fertilizer is only 30-35%, significantly lower than the 45-55% in developed countries. According to statistics, due to unreasonable fertilization, more than 15 million tons of nitrogen are lost outside the farmland every year in my country. The reason is that conventional chemical fertilizers (such as urea, etc.) are easily lost or volatile when exposed to water, resulting in low fertilizer utilization and excessive application. Nitrogen fertilizer has caused a series of ecological and environmental safety problems. In addition, the extensive application of chemical fertilizers has exace...

Claims

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Application Information

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IPC IPC(8): C05C11/00C05G3/40
CPCC05C11/00C05G3/40Y02P60/21
Inventor 孙少龙樊小林王浩然张立丹陈小娟
Owner SOUTH CHINA AGRI UNIV
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