Production method of novel ureaformaldehyde slow-release nitrogen fertilizer and composite fertilizers of novel ureaformaldehyde slow-release nitrogen fertilizer

A production method and urea-formaldehyde technology, which are applied to fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of difficulty in controlling the progress of the methylene reaction, the quality of the fertilizer is not stable enough, the reaction period is long, and the like, and it is difficult to agglomerate. , The effect of stable product quality and low production cost

Inactive Publication Date: 2015-07-08
ZHENGZHOU GAOFU FERTILIZER CO LTD
View PDF8 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem existing in this invention is to prepare starch paste first and then add formaldehyde and urea. It does not mention how to heat to make the reaction happen, and then how to take away the heat released by the reaction to keep the reaction temperature at 60°C-80°C. The second part needs to add an adsorbent, and then the solidified product with a water content of 5%-40% is produced
The problem that it exists is that the solution after the hydroxymethylation reaction in the first s

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Add urea and 50% formaldehyde solution evenly into a special reactor at a molar ratio of 2.5:1, mix and dissolve while heating, wait until the temperature reaches 50°C, add catalyst and 25% sodium hydroxide solution to adjust the pH value to 7.5 , and then kept stirring while cooling, keeping the temperature at about 50° C. and stirring for 35 minutes to carry out the methylolation reaction. Then add catalyst and dilute sulfuric acid with a concentration of 20%, adjust the pH value to 3.5, stir for 1 minute to carry out methyleneization reaction, and then spray dry to obtain pure slow-release urea-formaldehyde powder. The index of the product is: total nitrogen 39.3%, of which cold water dissolved nitrogen (CWN) 11.9%, cold water insoluble nitrogen (CWIN) 27.6%, hot water insoluble nitrogen (HWIN) 12.7%, activity coefficient (AI) value 40%.

Embodiment 2

[0049] Add urea and 30% formaldehyde solution evenly into a special reactor at a molar ratio of 1.5:1, heat while dissolving, and at the same time evenly add catalyst and 30% sodium hydroxide solution to control the pH of the material The value is 10.5, when the temperature reaches 50°C, open the control valve of the reactor to make the materials react while flowing in the reactor, and at the same time, continuously and uniformly add urea, formaldehyde solution, catalyst, and sodium hydroxide solution in proportion. When the initially added material starts to heat the later added material, according to the temperature change, reduce or stop the heating, and control the temperature at 75°C to carry out the methylolation reaction. When the temperature of the initially added material starts to drop from the temperature rise, through another feeding port, according to the flow rate and pH value of the material, evenly add catalyst and dilute sulfuric acid with a concentration of 20...

Embodiment 3

[0051] According to the amount added per hour, mix the following materials evenly, and evenly add them to the spray granulation dryer (1200 kg of potassium sulfate powder containing 50% potassium oxide, 680 kg of 11-44-0 monoammonium phosphate powder, With 250 kilograms of urea containing 46% nitrogen, 995 kilograms of dolomite powder, 50 kilograms of ferrous sulfate monohydrate, 25 kilograms of zinc sulfate monohydrate), the methyleneization slurry produced by example two is pressed at the rate of 3000 kilograms per hour Spray evenly into the spray granulation dryer, and in the case of continuous production, it can produce 5 tons of 18-6-12 compound fertilizer containing urea-formaldehyde slow-release nitrogen per hour. The 18% total nitrogen contains 1.5% ammonium nitrogen, 2.5% urea nitrogen, and 14.0% urea-formaldehyde nitrogen (including 8.0% cold water insoluble nitrogen and 3.4% hot water insoluble nitrogen).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a production method of a novel ureaformaldehyde slow-release nitrogen fertilizer and composite fertilizers of the novel ureaformaldehyde slow-release nitrogen fertilizer. The production method comprises following steps: urea is dissolved in formaldehyde solutions with common concentrations at a urea/formaldehyde molar ratio of 1.5-2.5:1; under alkaline conditions, an obtained mixture is subjected to hydroxymethylation reaction; and then under acidic conditions, methylenenation of an obtained product is realized quickly. According to the preparation method, technical conditions such as molar ratio of urea to formaldehyde are controlled, so that the pure powdery or granular ureaformaldehyde slow-release nitrogen fertilizer with an activity index (AI value) ranging from 40 to 65 is obtained, and the composite fertilizers of the ureaformaldehyde slow-release nitrogen fertilizer can be obtained via traditional composite fertilizer production methods. The production method comprises following characteristics: technology is simple; reaction time is short; heat energy released by reaction is fully used; energy consumption is low; quality of the obtained products is reliable; slow release performance is excellent; particles are uniform; strength is high; caking is not easily caused; and production cost is low.

Description

technical field [0001] The invention relates to the field of producing urea-formaldehyde slow-release fertilizers, in particular to a production method of a novel urea-formaldehyde slow-release nitrogen fertilizer and a compound fertilizer thereof. Background technique [0002] In 2012, my country's urea output was 65 million tons (equivalent to N100%, the output reached 30.038 million tons), of which about 51 million tons were used for agriculture (equivalent to N100%, the output reached 23.46 million tons). The loss of urea in use accounts for 40% of the consumption, plus other loss methods of nitrogen, the utilization rate of urea nitrogen in my country is between 35% and 40%. Urea is a product with high energy consumption. my country mainly uses coal as raw material to produce urea. With global warming, my country is facing huge pressure to reduce carbon emissions. Therefore, the development of urea value-added technology is an important topic to improve and increase th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C05G3/00
Inventor 胡建民胡玉中胡书民刘小永
Owner ZHENGZHOU GAOFU FERTILIZER CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap