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Multiple nutrient macromolecule slow release carbon-base fertilizer and preparation method thereof

A polymer and multi-nutrient technology, applied in fertilization equipment, fertilizer mixture, application, etc., can solve the environmental pollution of eutrophication of water body, reduce the effective utilization rate of fertilizer, groundwater pollution and other problems, and meet the requirements of reducing pressure resistance performance , Improve the effective utilization rate and reduce the production cost

Active Publication Date: 2012-07-18
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Urea and potassium dihydrogen phosphate are the most commonly used and main types of fertilizers for supplementing nitrogen, phosphorus, and potassium in farmland today. However, they are small molecule fertilizers that are easily soluble in water. This not only greatly reduces the effective utilization rate of fertilizers, but also causes environmental pollution of eutrophication in rivers, rivers, lakes, seas and other water bodies. A large amount of polluted surface water dialysis will also pollute groundwater.

Method used

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  • Multiple nutrient macromolecule slow release carbon-base fertilizer and preparation method thereof
  • Multiple nutrient macromolecule slow release carbon-base fertilizer and preparation method thereof
  • Multiple nutrient macromolecule slow release carbon-base fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of polycarbonyl urea with m=1

[0035] In a 1L autoclave, add 216g (3.6mol) of urea, 162g (1.8mol) of dimethyl carbonate, and 1.0g of potassium oxalate. -1 After stirring for 30 minutes at a high speed, heat up and react at 125°C for 6 hours, stop heating and continue stirring, and let it cool naturally to room temperature before discharging. After discharging, transfer the reaction mixture to a distillation pot for distillation, first recover the by-product methanol, then raise the temperature to 150°C, and heat for 1.0 h to adjust the molecular weight of polycarbonyl urea molecules, and obtain solid polycarbonyl urea after cooling. Urea 250g. The yield was 95%, the carbon content was 24.7%, and the nitrogen content was 38.4%. The infrared spectrum of the product is attached figure 1 As shown, the data attribute is as follows: N-H (3422, 3351, 3260 cm -1 ), C=O (1740 cm -1 ).

Embodiment 2

[0037] Preparation of polycarbonyl urea with m=3

[0038] In a 1L autoclave, add 216g (3.6mol) of urea, 243g (2.7mol) of dimethyl carbonate, and 0.43g of potassium carbonate.-1 After stirring for 30 minutes at a high speed, heat up and react at 145° C. for 7 h, stop heating and continue stirring, and let it cool naturally to room temperature before discharging. After discharging, transfer the reaction mixture to a distillation pot for distillation, first recover the by-product methanol, then raise the temperature to 160°C, and heat for 1.0 h to adjust the molecular weight of the polycarbonyl urea molecules, and obtain a viscous liquid after cooling Polycarbonylurea 266g. The yield is 93%, the viscosity is 405 Pa·s (measured at 25°C by using a NDJ-8S rotational viscometer), the carbon content is 26.4%, and the nitrogen content is 35.2%.

Embodiment 3

[0040] Preparation of polycarbonyl urea with m=4

[0041] In a 1L autoclave, add 216g (3.6mol) of urea, 259g (2.88mol) of dimethyl carbonate, and 0.6g of potassium formate. -1 After stirring for 30 minutes at a high speed, heat up and react at 130° C. for 10 h, stop heating and continue stirring, cool to room temperature naturally, and then discharge. After discharging, transfer the reaction mixture to a distillation pot for distillation, first recover the by-product methanol, then raise the temperature to 155°C, and heat for 1.5 h to adjust the molecular weight of the polycarbonyl urea molecules, and obtain a viscous liquid after cooling Polycarbonyl urea 253g, yield 87%, viscosity 410Pa·s (measured by NDJ-8S rotational viscometer at 25°C), carbon content 26.7%, nitrogen content 34.7%.

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Abstract

The invention discloses a multiple nutrient macromolecule slow release carbon-base fertilizer, the fertilizer is a compound with the following formula: in the formula: m and n represent the average degree of polymerization, M=1-7, n=50-200, and the fertilizer is prepared via polycondensation with polycarboureide and potassium dihydrogen phosphate as the raw material. The fertilizer molecules comprise a plurality of amide groups, when the fertilizer is applied into soil, the fertilizer slowly releases nutrient through self degradation, the degraded final product is bicarbonate radical ions andnitrogen, phosphor, and potassium nutrients capable of being absorbed and used by a plant, wherein the bicarbonate radical ions can be absorbed into the plant body via the root of the plant, and in aphotosynthesis with water to generate glucose, which is the main component of the carbon-base fertilizer; the elements of nitrogen, phosphor, and potassium can also be gradually converted to a water-soluble substance to be absorbed and used by the plant, preventing harmful substance from staying in soil, and the fertilizer is an environmentally-friendly green fertilizer.

Description

technical field [0001] The invention relates to a fertilizer preparation technology, in particular to a carbon-based fertilizer and a preparation method thereof. Background technique [0002] The traditional view is that the balance of nitrogen, phosphorus and potassium is the key to plant nutrition. But really, they're just the key to plant mineral nutrition. The key to plant nutrition should be the three elements of carbon, oxygen and hydrogen. Since the German chemist Liebig created the plant mineral nutrition theory in 1840 and the birth of chemical fertilizers, people only pay attention to the application of mineral fertilizers such as nitrogen fertilizer, phosphorus fertilizer, and potassium fertilizer, and ignore the supply of carbon, hydrogen, and oxygen nutrients. To obtain sufficient carbon, hydrogen, and oxygen from water and water without supplying them through chemical fertilizers. This misunderstanding has made almost no one in the fertilizer industry involv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 赵贵哲陈建超赵培华刘亚青朱福田
Owner ZHONGBEI UNIV
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