CN1990428A - Urea methanal preparing technique - Google Patents
Urea methanal preparing technique Download PDFInfo
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- CN1990428A CN1990428A CN 200510127389 CN200510127389A CN1990428A CN 1990428 A CN1990428 A CN 1990428A CN 200510127389 CN200510127389 CN 200510127389 CN 200510127389 A CN200510127389 A CN 200510127389A CN 1990428 A CN1990428 A CN 1990428A
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Abstract
The invention relates to a process for preparing urea formaldehyde. The current process is complex and the bad fertilizer efficiency of produced urea formaldehyde, and the process in this invention can solve said problems. The process in this invention comprises following steps: adding certain amount filtering liquid into autoclave, adding urea during heating, stirring to required temperature of 60 Deg. C, adjusting pH with 25% NaOH to 8.5-8.8, adding formaldehyde with required amount, now the temperature is increased to 78 Deg. C, heat insulating for 10 minutes, cooling with cyclic cold water to 60 Deg. C, adding 70% to adjust pH to be between 4.4-4.1, the temperature for reaction should be controlled to be lower than 68 Deg. C for 10 minutes, at 60 Deg. C for 35 minutes; adjusting pH with 25% NaOH to be between 8.0-8.5; reducing temperature be below 50 Deg. C, stopping reaction; discharging, filtering, disintegrating, sifting and packing. The invention is suited to be used as fertilizer for various field crop, economic crop and forest and flower.
Description
Technical field:
The present invention relates to a kind of urea methanal preparing technique.
Background technology:
Preparation technology's more complicated of existing urine formaldehyde and be not easy to operation, the fertilizer efficiency of the urine formaldehyde of production is short.Urea methanal preparing technique of the present invention then can solve above problem, the slow release fertilizer urine formaldehyde that utilizes the technology of the present invention to produce, because of physical chemistry and biological chemistry modification, the dissolving of contained nutritive element, disengage and transform, more traditional chemical fertilizer has very strong adjusting controlled-release function, thereby has improved fertilizer in this season utilization ratio, and has alleviated the pollution of fertilizer to environment greatly.
Summary of the invention:
It is simple and be convenient to operation, the urea methanal preparing technique that the fertilizer efficiency of the urine formaldehyde of production is long to the purpose of this invention is to provide a kind of production technique.
Above-mentioned purpose realizes by following technical scheme:
Urea methanal preparing technique, the filtrate that in reactor, adds specified amount, intensification limit, limit adds urea, stir molten 60 ℃ of the specified temperature of rising to and transfer pH value 8.5～8.8 with 25%NaOH, the formaldehyde that adds specified amount, this moment, temperature rose to 78 ℃ of insulations 10 minutes, open cycle cold water is cooled to 60 ℃ then, adds 70% dilute hydrochloric acid accent pH value then, and pH value is between the 4.4-4.1, temperature of reaction was controlled at below 68 ℃ 10 minutes, 60 ℃ control 35 minutes, transferring PH to PH with 25%NaOH is 8.0～8.5, cools the temperature to 50 ℃, stopped reaction is carried out blowing and is filtered, oven dry, pulverize, screening, packing.
Described urea methanal preparing technique, the ratio of described urea, formaldehyde, filtrate are 2: 1: 1.3.
This technical scheme has following beneficial effect:
1. it is long that the slow release fertilizer urine formaldehyde nutrition that utilizes production technology of the present invention to produce discharges slow fertilizer efficiency period, lose little utilization ratio height, on using, can reach single fertilization, reach saving of labor, fertile, the increasing both production and income of joint, improve social benefit and ecological environment benefit.
2. the slow release fertilizer urine formaldehyde that utilizes the technology of the present invention to produce, because of physical chemistry and biological chemistry modification, the dissolving of contained nutritive element, disengage and transform, more traditional chemical fertilizer has very strong adjusting controlled-release function, and fertilizer efficiency is long, thereby has improved fertilizer in this season utilization ratio, and alleviated the pollution of fertilizer greatly to environment, for improving agriculture production and ensureing that agriculture safety and environmental safety will play very vital role.
3. production technology of the present invention, the temperature and pressure that needs during its reaction is lower, and can save a large amount of energy.Traditional production technique then needs the condition of High Temperature High Pressure, can waste a large amount of resources, and also influential to environment.
4. production technique of the present invention is lower to the requirement of conversion unit, can reduce the production maintenance cost.
5. utilize good objectionable constituent of urine formaldehyde products quality that production technique of the present invention produces all less than 1%, reactivity coefficient height, the high had good sustained release effect of the insoluble nitrogen content of the high cold and hot water of total nitrogen, production technique production process of the present invention is simple and direct, producing only needs primary drying just can finish, and traditional production technique then needs redrying just can finish.
6. production technique less investment of the present invention, cost hangs down remarkable in economical benefits, production process equipment is simple, convenient control helps management and operation, in the addition reaction and polyreaction of production technique, pH value is regulated the speed soon, time and easy control of temperature, the required production time is short, turnout major end item rate height.
Description of drawings:
Accompanying drawing 1 is the schema of technology of the present invention.
The specific embodiment of the present invention:
Embodiment 1:
Urea methanal preparing technique, its technological process is: the filtrate that adds specified amount in reactor is surveyed pH value, intensification limit, limit adds urea, stirring molten 60 ℃ of the specified temperature of rising to transfers between the pH value 8.5～8.8 with 25%NaOH, the formaldehyde that adds specified amount, this moment, temperature rose to 78 ℃ of insulations 10 minutes, open cycle cold water is cooled to 60 ℃ then, add 70% dilute hydrochloric acid (content that wherein contains HCL in the dilute hydrochloric acid is 35%) then and transfer pH value, general it can be adjusted to pH value three times be between the 4.4-4.1, also can align continuously, and temperature of reaction was controlled at below 68 ℃ 10 minutes, also can for 60 ℃, control 35 minutes down at 60 ℃ then, transferring PH to PH with 25%NaOH is between 8.0～8.5, cools the temperature to 50 ℃, stopped reaction is carried out blowing and is filtered, oven dry, pulverize, screening, packing.
Embodiment 2:
Embodiment 1 described urea methanal preparing technique, the ratio of described urea, formaldehyde, filtrate is 2: 1: 1.3.
Claims (2)
1. urea methanal preparing technique, it is characterized in that: the filtrate that in reactor, adds specified amount, intensification limit, limit adds urea, stir molten 60 ℃ of the specified temperature of rising to and transfer pH value 8.5～8.8 with 25%NaOH, the formaldehyde that adds specified amount, this moment, temperature rose to 78 ℃ of insulations 10 minutes, open cycle cold water is cooled to 60 ℃ then, adds 70% dilute hydrochloric acid accent pH value then, and pH value is between the 4.4-4.1, temperature of reaction was controlled at below 68 ℃ 10 minutes, 60 ℃ control 35 minutes, transferring PH to PH with 25%NaOH is 8.0～8.5, cools the temperature to 50 ℃, stopped reaction is carried out blowing and is filtered, oven dry, pulverize, screening, packing.
2. urea methanal preparing technique according to claim 1 is characterized in that: the ratio of described urea, formaldehyde, filtrate is 2: 1: 1.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510127389 CN1990428A (en) | 2005-12-26 | 2005-12-26 | Urea methanal preparing technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510127389 CN1990428A (en) | 2005-12-26 | 2005-12-26 | Urea methanal preparing technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1990428A true CN1990428A (en) | 2007-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510127389 Pending CN1990428A (en) | 2005-12-26 | 2005-12-26 | Urea methanal preparing technique |
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| CN (1) | CN1990428A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101955379A (en) * | 2010-08-29 | 2011-01-26 | 山东史贝美肥料开发有限公司 | Preparation method for nitrate urea-formaldehyde fertilizer |
| CN102040400A (en) * | 2010-11-19 | 2011-05-04 | 中北大学 | Green synthesis process of slow release carbon base nitrogen fertilizer |
| CN102584458A (en) * | 2012-02-29 | 2012-07-18 | 中北大学 | Multiple nutrient macromolecule slow release carbon-base fertilizer and preparation method thereof |
| CN101353270B (en) * | 2008-09-08 | 2012-07-25 | 中国海洋石油总公司 | Preparation of low aldehyde long-acting urea-formaldehyde slow release fertilizer |
| CN114184000A (en) * | 2021-12-20 | 2022-03-15 | 武汉绿茵化工有限公司 | Urea formaldehyde continuous polymerization drying production device |
-
2005
- 2005-12-26 CN CN 200510127389 patent/CN1990428A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353270B (en) * | 2008-09-08 | 2012-07-25 | 中国海洋石油总公司 | Preparation of low aldehyde long-acting urea-formaldehyde slow release fertilizer |
| CN101955379A (en) * | 2010-08-29 | 2011-01-26 | 山东史贝美肥料开发有限公司 | Preparation method for nitrate urea-formaldehyde fertilizer |
| CN102040400A (en) * | 2010-11-19 | 2011-05-04 | 中北大学 | Green synthesis process of slow release carbon base nitrogen fertilizer |
| CN102040400B (en) * | 2010-11-19 | 2011-12-07 | 中北大学 | Green synthesis process of slow release carbon base nitrogen fertilizer |
| CN102584458A (en) * | 2012-02-29 | 2012-07-18 | 中北大学 | Multiple nutrient macromolecule slow release carbon-base fertilizer and preparation method thereof |
| CN102584458B (en) * | 2012-02-29 | 2013-08-07 | 中北大学 | Multiple nutrient macromolecule slow release carbon-base fertilizer and preparation method thereof |
| CN114184000A (en) * | 2021-12-20 | 2022-03-15 | 武汉绿茵化工有限公司 | Urea formaldehyde continuous polymerization drying production device |
| CN114184000B (en) * | 2021-12-20 | 2022-11-08 | 武汉绿茵化工有限公司 | Urea formaldehyde continuous polymerization drying production device |
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