CN105503277A - Slow-release urea formaldehyde fertilizer and production method thereof - Google Patents
Slow-release urea formaldehyde fertilizer and production method thereof Download PDFInfo
- Publication number
- CN105503277A CN105503277A CN201510988064.1A CN201510988064A CN105503277A CN 105503277 A CN105503277 A CN 105503277A CN 201510988064 A CN201510988064 A CN 201510988064A CN 105503277 A CN105503277 A CN 105503277A
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- China
- Prior art keywords
- urea
- reaction
- release fertilizer
- urea formaldehyde
- slow release
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Classifications
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
- C05C9/02—Fertilisers containing urea or urea compounds containing urea-formaldehyde condensates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
Abstract
The invention relates to the field of production of urea formaldehyde fertilizer, in particular to slow-release urea formaldehyde fertilizer and a production method thereof. The molar ratio of formaldehyde to urea in raw materials used by the slow-release urea formaldehyde fertilizer is 1:(3-3.5), after formaldehyde and urea are mixed in the molar ratio being 1:(2-2.5) to react for 20 min, sodium hydroxide is added to adjust the solution to be alkaline, the solution continuously reacts for a period, phosphoric acid is added to enable the solution to be acid, then urea is added for a mixed reaction, now the molar ratio of added urea and formaldehyde is 1:1, and the slow-release urea formaldehyde fertilizer is obtained finally after granulation and drying. The preparation technology is simple, energy consumption is low, the cost is low, the content of nitrogen is not limited by the production environment, and the product is stable in quality and good in slow release performance and cannot cake, volatilize or lose easily.
Description
Technical field
The present invention relates to urea formaldehyde field of fertilizer production, be specifically related to a kind of urea formaldehyde slow release fertilizer and production method thereof.
Background technology
Urea aldehyde slow release fertilizer has good slow-releasing and physical property, with its Bulk Blending Fertilizer for raw material configuration, granule fertilizer and Liquid Fertilizer etc., there is prolongation fertilizer releasing period, strengthen soil microbial activities, improve the benefit of fertilizer physical behavior, it is one of slow release fertilizer kind of current most potentiality, for promotion China nitrogenous fertilizer industrial upgrading, the alleviation energy, environmental stress have far-reaching realistic meaning.
The high plant recovery of nutrient shown due to urea formaldehyde slow-release fertilizer and the provide protection to environment, its demand and turnout increase year by year, and the U.S., West Europe and Japan have all carried out suitability for industrialized production and has been sold to world market.Domestic urea formaldehyde and containing the composite fertilizer yearly capacity of urea formaldehyde more than 1,000,000 tons, and towards market extensive, such as golf lawn, gardening, vegetables, land for growing field crops.
But at present, the decomposition of urea-formaldehyde fertilizer mainly relies on the effect of soil microorganisms, therefore, in the prior art, in urea formaldehyde, the release of nitrogen depends on change and the ambient conditions of soil property, as microorganism active, soil acidity or alkalinity and water content thereof, Air Temperature wet condition, and then the relation of need fertilizer process that the fertilizer process being unfavorable for controlling nutrients release in urea formaldehyde absorbs with farm crop, therefore, likely cause fertilizer deficiency in seedling stage, plant-growth is slow; Or the later stage is de-fertile, affects yield and quality.
Summary of the invention
The present invention, for solving the problems of the technologies described above, provides a kind of nutrient abundance, Nitrogen releasing slow, activity stabilized urea formaldehyde slow release fertilizer, and the production method that production technique is simple, cost is low.
Be achieved especially by following scheme:
A kind of urea formaldehyde slow release fertilizer, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of formaldehyde and urea is 1:3-3.5.
Further, its production method, comprises the following steps:
(1) first stage reaction: be after 1:2-2.5 hybrid reaction 20min in molar ratio by formaldehyde and urea, adding sodium hydrate regulator solution is continue reaction after alkalescence, and this stage total reaction time is 0.5-1h;
(2) subordinate phase reaction: the first stage, add phosphoric acid and make first stage reaction gained solution be after acidity, then add urea hybrid reaction, the urea added in this stage and formaldehyde mole ratio were 1:1 after completion of the reaction;
(3) reacted for subordinate phase solution is proceeded to prilling granulator and carry out direct spray granulating, more after drying, obtain urea formaldehyde slow release fertilizer.
The Solution percentages of described sodium hydroxide is 20-25%.
Described solution alkaline, its pH is 7.5-8.0.
P in described phosphoric acid
2o
5massfraction be 62-70%.
Described solution is in acid, and its pH is 4.5-5.
Described first stage reaction and subordinate phase reaction, its temperature is 50-60 DEG C.
Described first stage reaction and subordinate phase reaction, its temperature is 55 DEG C.
Described first stage reaction and subordinate phase reaction, its reaction total time is 2-3h.
Beneficial effect of the present invention
Production technique of the present invention is simple, and energy consumption is low, and cost is low, constant product quality, sustained release performance is good, its quick-acting, middle effect and long-acting nitrogen ratio moderate, its slow-release time reaches 6-8 month, prevented from caking, reduce equipment damage rate, not volatile or loss, can improve utilization rate of fertilizer 30%.Urea formaldehyde slow-release fertilizer of the present invention in agricultural application, its quick-acting, middle effect and long-acting nitrogen ratio moderate, and then be easy to the rule coordinating crop nitrogen demand, and then be conducive to growing of crop.
Embodiment
Below in conjunction with concrete embodiment, further restriction is done to technical scheme of the present invention, but claimed scope is not only confined to done description.
Embodiment 1
A kind of urea formaldehyde slow release fertilizer, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of formaldehyde and urea is 1:3.
Its production method is: at steady temperature is 50 DEG C, after 100kg formaldehyde and 400kg urea hybrid reaction 20min, add Solution percentages be 20% sodium hydrate regulator solution pH continue reaction 10min after 7.7, add P
2o
5massfraction be 70% phosphoric acid make pH value of solution be after 4.8, then add 200kg urea hybrid reaction 2.5h, gained solution proceeded to prilling granulator and carries out direct spray granulating, at 120 DEG C after drying, obtain urea formaldehyde slow release fertilizer.
This urea formaldehyde slow release fertilizer, total nitrogen is 43.1%, and cold water insoluble nitrogen content is 25.2%, and activity index is 50%, and moisture is 2.1%.
Embodiment 2
A kind of urea formaldehyde slow release fertilizer, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of formaldehyde and urea is 1:3.5.
Its production method is: at steady temperature is 55 DEG C, after 50kg formaldehyde and 250kg urea hybrid reaction 20min, add Solution percentages be 25% sodium hydrate regulator solution pH continue reaction 30min after 8.0, add P
2o
5massfraction be 62% phosphoric acid make solution be after pH4.6, then add 100kg urea hybrid reaction 1.5h, gained solution proceeded to prilling granulator and carries out direct spray granulating, at 100 DEG C after drying, obtain urea formaldehyde slow release fertilizer.
This urea formaldehyde slow release fertilizer, total nitrogen is 40.9%, and cold water insoluble nitrogen content is 26.9%, and activity index is 48%, and moisture is 1.8%.
Embodiment 3
A kind of urea formaldehyde slow release fertilizer, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of formaldehyde and urea is 1:3.2.
Its production method is: at initial temperature is 50 DEG C, keep temperature-resistant condition after 5min is warming up to 60 DEG C under, after 50kg formaldehyde and 220kg urea hybrid reaction 20min, add Solution percentages be 23% sodium hydrate regulator solution pH be the reaction 40min that sobs after 7.5, add P
2o
5massfraction be 65% phosphoric acid make pH value of solution be after 5.0, then add 100kg urea hybrid reaction 2h, gained solution proceeded to prilling granulator and carries out direct spray granulating, at 70 DEG C after drying, obtain urea formaldehyde slow release fertilizer.
This urea formaldehyde slow release fertilizer, total nitrogen is 38.6%, and cold water insoluble nitrogen content is 23%, and activity index is 42.6%, and moisture is 3%.
Embodiment 4
A kind of urea formaldehyde slow release fertilizer, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of formaldehyde and urea is 1:3.
Its production method is: at initial temperature is 50 DEG C, keep temperature-resistant condition after 10min is warming up to 60 DEG C under, after 50kg formaldehyde and 200kg urea hybrid reaction 20min, add Solution percentages concentration be 23% sodium hydrate regulator solution pH continue reaction 40min after 7.8, add P
2o
5massfraction be 68% phosphoric acid make pH value of solution be after 4.5, then add 100kg urea hybrid reaction 1h, gained solution proceeded to prilling granulator and carries out direct spray granulating, then at 50 DEG C after drying, obtain urea formaldehyde slow release fertilizer.
This urea formaldehyde slow release fertilizer, total nitrogen is 45.1%, and cold water insoluble nitrogen content is 26.8%, and activity index is 52.3%, and moisture is 2.7%.
Embodiment 5
A kind of urea formaldehyde slow release fertilizer, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of formaldehyde and urea is 1:3.1.
Its production method is: at initial temperature is 50 DEG C, keep temperature-resistant condition after 5min is warming up to 55 DEG C under, after 100kg formaldehyde and 420kg urea hybrid reaction 20min, add Solution percentages concentration be 20% sodium hydrate regulator solution pH continue reaction 10min after 8.0, add P
2o
5massfraction be 67% phosphoric acid make pH value of solution be after 5.0, then add 200kg urea hybrid reaction, gained solution proceeded to prilling granulator and carries out direct spray granulating, at temperature is 98 DEG C after drying, obtain urea formaldehyde slow release fertilizer.
This urea formaldehyde slow release fertilizer, total nitrogen is 50.2%, and cold water insoluble nitrogen content is 34.8%, and activity index is 54%, and moisture is 1.5%.
Claims (9)
1. a urea formaldehyde slow release fertilizer, is characterized in that, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of formaldehyde and urea is 1:3-3.5.
2. the production method of the urea formaldehyde slow release fertilizer that paddy rice as claimed in claim 1 is special, is characterized in that, comprise the following steps:
(1) first stage reaction: be after 1:2-2.5 hybrid reaction 20min in molar ratio by formaldehyde and urea, adding sodium hydrate regulator solution is continue reaction after alkalescence, and this stage total reaction time is 0.5-1h;
(2) subordinate phase reaction: the first stage, add phosphoric acid and make first stage reaction gained solution be after acidity, then add urea hybrid reaction, the urea added in this stage and formaldehyde mole ratio were 1:1 after completion of the reaction;
(3) reacted for subordinate phase solution is proceeded to prilling granulator and carry out direct spray granulating, more after drying, obtain urea formaldehyde slow release fertilizer.
3. the production method of urea formaldehyde slow release fertilizer as claimed in claim 2, it is characterized in that, the Solution percentages of described sodium hydroxide is 20-25%.
4. the production method of urea formaldehyde slow release fertilizer as claimed in claim 2, it is characterized in that, described solution alkaline, its pH is 7.5-8.0.
5. the production method of urea formaldehyde slow release fertilizer as claimed in claim 2, is characterized in that, P in described phosphoric acid
2o
5massfraction be 62-70%.
6. the production method of urea formaldehyde slow release fertilizer as claimed in claim 2, is characterized in that, described solution is in acid, and its pH is 4.5-5.
7. the production method of urea formaldehyde slow release fertilizer as claimed in claim 2, is characterized in that, described first stage reaction and subordinate phase reaction, its temperature is 50-60 DEG C.
8. the production method of urea formaldehyde slow release fertilizer as claimed in claim 7, is characterized in that, described first stage reaction and subordinate phase reaction, its temperature is 55 DEG C.
9. the production method of urea formaldehyde slow release fertilizer as claimed in claim 2, is characterized in that, described first stage reaction and subordinate phase reaction, its reaction total time is 2-3h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510988064.1A CN105503277A (en) | 2015-12-24 | 2015-12-24 | Slow-release urea formaldehyde fertilizer and production method thereof |
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| CN201510988064.1A CN105503277A (en) | 2015-12-24 | 2015-12-24 | Slow-release urea formaldehyde fertilizer and production method thereof |
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| CN105503277A true CN105503277A (en) | 2016-04-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107879766A (en) * | 2017-11-08 | 2018-04-06 | 贵州省化工研究院 | A kind of ureaformaldehyde method of modifying and modified urea formaldehyde and its application |
| CN108046923A (en) * | 2017-12-27 | 2018-05-18 | 福建省农业科学院土壤肥料研究所 | A kind of multi-functional organic-inorganic medicine fertilizer and preparation method thereof |
| CN113493360A (en) * | 2021-07-26 | 2021-10-12 | 贵州省化工研究院 | Production method of urea formaldehyde slow-release nitrogen fertilizer |
| CN115024188A (en) * | 2022-01-21 | 2022-09-09 | 江苏省农业科学院 | Preparation method of nitrogen slow-release type straw seedling raising substrate disc |
| RU2811540C1 (en) * | 2023-04-03 | 2024-01-15 | Сергей Васильевич Афанасьев | Method of producing complex nitrogen fertilizer with prolonged action |
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|---|---|---|---|---|
| US20010049952A1 (en) * | 1999-09-14 | 2001-12-13 | Wertz Stacey L. | Controlled release urea-formaldehyde liquid fertilizer resins with high nitrogen levels |
| CN1789207A (en) * | 2005-12-20 | 2006-06-21 | 曹承绵 | Urea formaldehyde and its production process |
| CN103214312A (en) * | 2013-04-25 | 2013-07-24 | 黄河水利委员会黄河水利科学研究院 | High-molar-ratio urea formaldehyde slow-release fertilizer and preparation method for same |
| CN104193536A (en) * | 2014-09-22 | 2014-12-10 | 广东省农业科学院农业资源与环境研究所 | Charcoal-based stable compound fertilizer and preparation method thereof |
| CN104276871A (en) * | 2014-10-23 | 2015-01-14 | 贵州省化工研究院 | Preparation method of urea-formaldehyde slow release fertilizer |
-
2015
- 2015-12-24 CN CN201510988064.1A patent/CN105503277A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010049952A1 (en) * | 1999-09-14 | 2001-12-13 | Wertz Stacey L. | Controlled release urea-formaldehyde liquid fertilizer resins with high nitrogen levels |
| CN1789207A (en) * | 2005-12-20 | 2006-06-21 | 曹承绵 | Urea formaldehyde and its production process |
| CN103214312A (en) * | 2013-04-25 | 2013-07-24 | 黄河水利委员会黄河水利科学研究院 | High-molar-ratio urea formaldehyde slow-release fertilizer and preparation method for same |
| CN104193536A (en) * | 2014-09-22 | 2014-12-10 | 广东省农业科学院农业资源与环境研究所 | Charcoal-based stable compound fertilizer and preparation method thereof |
| CN104276871A (en) * | 2014-10-23 | 2015-01-14 | 贵州省化工研究院 | Preparation method of urea-formaldehyde slow release fertilizer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107879766A (en) * | 2017-11-08 | 2018-04-06 | 贵州省化工研究院 | A kind of ureaformaldehyde method of modifying and modified urea formaldehyde and its application |
| CN108046923A (en) * | 2017-12-27 | 2018-05-18 | 福建省农业科学院土壤肥料研究所 | A kind of multi-functional organic-inorganic medicine fertilizer and preparation method thereof |
| CN113493360A (en) * | 2021-07-26 | 2021-10-12 | 贵州省化工研究院 | Production method of urea formaldehyde slow-release nitrogen fertilizer |
| CN115024188A (en) * | 2022-01-21 | 2022-09-09 | 江苏省农业科学院 | Preparation method of nitrogen slow-release type straw seedling raising substrate disc |
| CN115024188B (en) * | 2022-01-21 | 2024-02-23 | 江苏省农业科学院 | Preparation method of nitrogen slow-release type straw seedling raising substrate tray |
| RU2811540C1 (en) * | 2023-04-03 | 2024-01-15 | Сергей Васильевич Афанасьев | Method of producing complex nitrogen fertilizer with prolonged action |
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Application publication date: 20160420 |
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