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Efficient environment-friendly reactive extrusion integrated continuous processing technology of urea aldehyde and derivatives thereof

A technology of reactive extrusion and processing technology, applied in the field of high-efficiency and environmentally friendly reactive extrusion integrated continuous processing technology, to achieve the effects of significant economic and social benefits, flexible nutrient composition and content, and short payback period

Active Publication Date: 2021-06-04
ZHONGBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, this production technology is still rarely involved in the agricultural field, and the use of reactive extrusion technology to realize the production and processing of urea aldehyde and its derivatives is expected to solve the problem of continuous production of high-viscosity urea aldehyde and its derivatives

Method used

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  • Efficient environment-friendly reactive extrusion integrated continuous processing technology of urea aldehyde and derivatives thereof
  • Efficient environment-friendly reactive extrusion integrated continuous processing technology of urea aldehyde and derivatives thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] An efficient and environmentally friendly reactive extrusion integrated continuous processing process for preparing urea aldehyde derivatives, comprising the following steps:

[0036] (1) Add 5000g of formaldehyde into the reactor, then add 1920g of urea, react at 80°C for 30min, and obtain a methylol urea solution.

[0037] (2) Seal the die mouth of the integrated reaction extrusion machine, then add the above-mentioned methylol urea solution into the integrated reaction extrusion machine, and then add 50 g of hydroxyapatite.

[0038] (3) Set the temperature of the reaction unit of the reaction extrusion machine to 100°C, adjust the rotation speed of the stirring shaft to 50r / min for the reaction, and start the vacuum devolatilization unit to remove the moisture in the reaction system at the same time, the vacuum degree is -0.07MPa, until the reaction system becomes viscous.

[0039] (4) Open the die mouth of the integrated reaction extrusion machine, start the extrus...

Embodiment 2

[0042] An efficient and environmentally friendly reactive extrusion integrated continuous processing process for preparing urea aldehyde, comprising the following steps:

[0043] (1) Add 5000g of formaldehyde into the reactor, then add 1920g of urea, react at 80°C for 30min, and obtain a methylol urea solution.

[0044] (2) Seal the die mouth of the integrated reaction extrusion machine, and then add the above-mentioned methylol urea solution into the integrated reaction extrusion machine.

[0045] (3) Set the temperature of the reaction unit of the reaction extrusion machine to 100°C, adjust the rotation speed of the stirring shaft to 50r / min for the reaction, and start the vacuum devolatilization unit to remove the moisture in the reaction system at the same time, the vacuum degree is -0.07MPa, until the reaction system becomes viscous.

[0046] (4) Open the die mouth of the integrated reaction extrusion machine, start the extrusion unit of the integrated reaction extrusion...

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Abstract

The invention particularly relates to an efficient environment-friendly reactive extrusion integrated continuous processing technology of urea aldehyde and derivatives thereof. The technology specifically comprises the following steps: firstly, preparing a hydroxymethyl urea solution, then feeding the hydroxymethyl urea solution into a reactive extrusion all-in-one machine, adding or not adding phosphate or other medium trace element fertilizers, starting a reaction unit of the reactive extrusion all-in-one machine to react, and meanwhile, starting a vacuumizing devolatilization unit to remove moisture in a reaction system; and after the reaction is finished, starting an extrusion unit of the reaction and extrusion all-in-one machine, extruding to obtain a strip-shaped product, and drying and granulating to obtain a finished product. The extrusion unit and the reaction unit are integrated, forced discharging of the output end of the reaction unit is achieved, and then continuous production of urea aldehyde is achieved. Besides, a vacuumizing devolatilization unit is additionally arranged on the reaction extrusion all-in-one machine so that reaction extrusion of raw materials with different solid contents can be realized, the nutrient composition and content of the final product are flexible and variable, and the special urea aldehyde meeting the nutrient requirements of different crops is prepared.

Description

technical field [0001] The invention belongs to the technical field of slow and controlled release fertilizers, and in particular relates to an efficient and environmentally friendly reaction-extrusion integrated continuous processing technology of urea aldehyde and its derivatives. Background technique [0002] In order to solve the problem of low nutrient utilization efficiency of traditional chemical fertilizers, slow and controlled release fertilizers have become a hot spot in fertilizer research and are developing rapidly in my country. Among them, urea aldehyde slow-release nitrogen fertilizer is the earliest slow-release fertilizer that was successfully developed and commercialized, and has become the most potential slow-release fertilizer variety, which is of great significance to promoting the upgrading of my country's nitrogen fertilizer industry and alleviating energy and environmental pressure. very profound practical significance. [0003] For urea aldehyde and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/02C05G3/40C05G3/90C05G5/12
CPCC05C9/02C05G3/40C05G3/90C05G5/12C05B7/00C05C9/005C05G1/00C05G5/40Y02P20/10
Inventor 向阳刘亚青耿阳阳赵贵哲
Owner ZHONGBEI UNIV
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