Controlled-release fertilizer as well as preparation method and application thereof

A technology of controlled release fertilizer and reaction temperature, applied in the application, nitrogen fertilizer, potassium fertilizer and other directions, can solve the problems of inability to utilize lignin fertilizer, not easy for crop absorption and utilization, large molecular weight of sodium sulfonate, etc., and achieves low raw material price and preparation method. Novel, small molecular weight effect

Inactive Publication Date: 2018-03-23
KINGENTA ECOLOGICAL ENG GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, only sodium sulfite is used to sulfonate lignin, and the obtained sodium lignosulfonate has a large molecular weight, which is not easy to be absorbed and utilized by crops, and cannot be used as a lignin fertilizer.
[0004] On the other hand, although lignin with small molecular weight and good water solubility is beneficial to the absorption of crops, there are still some problems. For example, lignin with small molecular weight and good water solubility will easily cause the loss of lignin fertilizer during fertilization and irrigation, reducing utilization efficiency
At present, there is no report on the direct use of lignin to make slow-control fertilizers

Method used

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  • Controlled-release fertilizer as well as preparation method and application thereof
  • Controlled-release fertilizer as well as preparation method and application thereof
  • Controlled-release fertilizer as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A controlled-release fertilizer and a preparation method thereof, the steps are as follows:

[0049] (1) 2Kg of wheat straw powder was added to 20Kg of water, and stirred at room temperature to obtain an aqueous solution of straw powder; 0.8Kg of potassium sulfite, 0.04Kg of urea, 1g of anthraquinone, and 3g of copper nitrate were added to the aqueous solution of straw powder in turn while stirring; Seal the high-pressure reaction device, raise the temperature to 160°C, stir for 3 hours, and spray dry to obtain 2.81Kg of solid powder;

[0050] (2) The solid powder obtained in step (1) was stirred and dispersed in 42Kg ethanol aqueous solution (60%), 2Kg of sodium hydroxide was added, the temperature was raised to 55° C., and the reaction was stirred for 30 minutes; after the reaction, 2.5 Kg chloroacetic acid, heat up to 80°C, stir for 3 hours, cool down to room temperature, neutralize with sulfuric acid to pH = 7-8, centrifuge, wash with 50% ethanol aqueous solution fo...

Embodiment 2

[0054] A controlled-release fertilizer and a preparation method thereof, the steps are as follows:

[0055] (1) Add 3Kg of corn stalk powder into 20 kg of water, and stir at room temperature to obtain an aqueous solution of straw powder; add 0.8 Kg of ammonium sulfite, 0.18 Kg of urea, 9 g of anthraquinone, and 30 g of copper sulfate into the aqueous solution of straw powder in turn while stirring. The high-pressure reaction device was sealed, the temperature was raised to 150°C, the reaction was stirred for 5 hours, and spray-dried to obtain 4Kg of solid powder.

[0056] (2) The solid powder obtained in step (1) was stirred and dispersed in 45Kg ethanol aqueous solution (75%), 3Kg of sodium hydroxide was added, the temperature was raised to 35°C, and the reaction was stirred for 60min; after the reaction, 3Kg was added to the reactant solution Chloroacetic acid, heat up to 70°C, stir for 5 hours, cool down to room temperature, neutralize with nitric acid to pH=7-8, centrifuge...

Embodiment 3

[0058] A controlled-release fertilizer and a preparation method thereof, the steps are as follows:

[0059] (1) Add 2Kg of rice straw powder and 2Kg of cotton straw powder into 20kg of water, stir at room temperature to obtain an aqueous solution of straw powder; add 1.5Kg of potassium bisulfite, 0.6Kg of ammonia, 30g of anthraquinone, and 100g of copper chloride into In the straw powder aqueous solution; seal the high-pressure reaction device, raise the temperature to 130° C., stir and react for 7 hours, and spray dry to obtain 5.6 Kg of solid powder.

[0060] (2) The solid powder obtained in step (1) was stirred and dispersed in 60Kg ethanol aqueous solution (80%), 3Kg of sodium hydroxide was added, the temperature was raised to 40°C, and the reaction was stirred for 90 minutes; after the reaction, add 4Kg of chloroacetic acid, heated up to 75°C, stirred for 2 hours, cooled to room temperature, neutralized with sulfuric acid to pH=7-8, centrifuged, washed 2-3 times with 60% ...

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Abstract

The invention relates to controlled-release fertilizer as well as a preparation method and application thereof. The controlled-release fertilizer is prepared by taking straw powder as a raw material,carrying out sulfonation treatment under the existence of sulfite, a buffer agent, anthraquinone and copper salt, then carrying out alkalization treatment by sodium hydroxide and finally carrying outchloroacetic acid treatment. The invention also provides the preparation method and the application of the controlled-release fertilizer. In the controlled-release fertilizer provided by the invention, the molecular weight of lignin is small, the sulfonating rate is high, and the lignin and cellulose in plant straw are fully utilized; the controlled-release fertilizer can be applied by adding water or be applied as base fertilizer or topdressed fertilizer, a slow release effect is good, and release of nutrients can be effectively controlled.

Description

technical field [0001] The invention relates to a controlled-release fertilizer and its preparation method and application, belonging to the field of fertilizer preparation. Background technique [0002] Chemical fertilizer is an important means of agricultural production and plays an irreplaceable role in promoting the development of food and agricultural production. However, there are still problems such as excessive and blind application of chemical fertilizers, which have brought about increased costs and environmental pollution. Improvements are urgently needed Fertilization methods, improve fertilizer utilization efficiency, reduce unreasonable inputs, ensure effective supply of major agricultural products such as grain, and promote sustainable agricultural development. [0003] Cellulose and lignin widely exist in plant straws, which are the most abundant organic renewable resources in the world. As a large agricultural country, China is very rich in straw resources,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05C3/00C05G3/00C05C5/00C05C9/00C05D1/02C05D9/02C05F11/00
Inventor 万连步尤龙郑树林高建仁芮文利陈宏坤
Owner KINGENTA ECOLOGICAL ENG GRP
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