CN102701889A - Slow-release urea and preparation method thereof - Google Patents
Slow-release urea and preparation method thereof Download PDFInfo
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- CN102701889A CN102701889A CN201210235027XA CN201210235027A CN102701889A CN 102701889 A CN102701889 A CN 102701889A CN 201210235027X A CN201210235027X A CN 201210235027XA CN 201210235027 A CN201210235027 A CN 201210235027A CN 102701889 A CN102701889 A CN 102701889A
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Abstract
The invention relates to a preparation method of a slow-release urea, in particular to a slow-release urea which has the advantages of small investment, simple process, low operation cost and good slow-release effect and a preparation method of the slow-release urea. The slow-release urea is prepared from the following components in parts by weight: 855-955 parts of urea solution with the concentration of 99.5% above, 20-50 parts of slow release agent, 15-30 parts of formaldehyde solution with the concentration of 37%, 5-15 parts of ethanol and 5-50 parts of hot water at the temperature of 70 DEG C. The slow-release urea and the preparation method of the slow-release urea have the advantages of small investment, simple process, low operation cost and good slow-release effect.
Description
Technical field
The invention belongs to the preparation method of slow-release carbamide, be specifically related to a kind of less investment, technology is simple, low slow-release carbamide with had good sustained release effect of running cost and preparation method thereof.
Background technology
China is maximum in the world fertiliser prodn and use country at present; Yet research shows that present stage China's fertilizer farmland nutrient utilization ratio is totally lower; Particularly utilization rate of nitrogen fertilizer is merely about 30%; For improving the particularly nutrientuse efficiency of urea of nitrogenous fertilizer, industry is exerting to carry out the research of slow-release carbamide.The addition means of slow releasing agent of urea is the important component part of research slow-release carbamide; Because many sustained release dosages all are solid, powdery; And wherein the composition more complicated is easy to bring into air if directly utilize the powder pump to join in the urea soln, and it is even to be difficult to proportioning.
Summary of the invention
The objective of the invention is to overcome defective of the prior art and provide a kind of less investment, technology simple, low slow-release carbamide with had good sustained release effect of running cost and preparation method thereof.
The objective of the invention is to realize like this: the present invention is made up of following raw materials by weight portion: concentration is that 20 parts-50 parts of 855 parts-955 parts of urea solns, sustained release dosages, the concentration 99.5% or more is 15 parts-30 parts of 37% formaldehyde solutions, and 5 parts-15 parts of ethanol and temperature are 70 ℃ 5 parts-50 parts of hot water.
Its step of preparation method of the present invention is following:
One, with sustained release dosage, concentration be 37% formaldehyde solution, ethanol and temperature are that 70 ℃ hot water proportionally joins the steel basin from the top of steel basin; Two, the mixing solutions in the steel basin in the step 1 was stirred 20 minutes-30 minutes, the mixing solutions after stirring is sent in the holding tank through first solution pump; Three, the mixing solutions in the holding tank in the step 2 is continued to stir, make the mixing solutions dissolving evenly; Four, the mixing solutions that mixes in the holding tank in the step 3 is got in the urea soln pipeline through second solution pump and heat-exchanger rig; Five, mixed urea soln in the urea soln pipeline in the step 4 is linked to each other with prilling tower; Six, mixed urea soln in the urea soln pipeline in the step 4 is linked to each other with rotary drum granulator; Seven, the urea soln in described step 5 and the step 6 is respectively through being finished product behind prilling tower and the rotary drum granulator.Heat-exchanger rig in the described step 4 is heated to 80 ℃-100 ℃ with the mixing solutions temperature.
The present invention compares with other technologies to have sustained release dosage and mixes, and product appearance gloss is mellow and full, and cost of investment is low, 200,000 yuan of less thaies, and one ton of slow-release carbamide of every production, cost increase about 100 yuan, and urea product water leaching slow release effect can reach 60%.It is nitrated in the existing slow-release carbamide with the nitrification inhibitor to be that the slow-release carbamide of additive can only accomplish to suppress urea, can't accomplish the deliquescent slowly-releasing of urea water; With the resin dressing be the urea of sustained release additives before dressing breaks, can't release urea, in case dressing breaks, urea is easy to just taken off by water-soluble, can't accomplish for a long time to the plain supply of the N of farm crop.The resin dressing is the expensive technique of generally acknowledging in the present slow-release carbamide, and one ton of slow-release carbamide of every production, cost increase more than 110 yuan, and relative our sustained release dosage of nitrification inhibitor is also high.One ton of urea of every production, cost increases about 120 yuan.
The present invention has less investment, technology is simple, and running cost is hanged down the advantage with had good sustained release effect.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
As shown in Figure 1; The present invention includes steel basin 1; Described steel basin 1 top is respectively arranged with hot water inlet 2, sustained release dosage import 3, ethanolic soln import 4 and formaldehyde solution import 5, described hot water inlet 2, sustained release dosage import 3; Ethanolic soln import 4 and formaldehyde solution import 5 respectively with hot water storage tank 6, sustained release dosage storage tank 7, ethanolic soln storage tank 8 links to each other with formaldehyde solution storage tank 9; Described steel basin 1 set inside has first whisking appliance 10; Described steel basin bottom is provided with steel basin taphole 11; Described steel basin taphole 11 through pipeline successively with first solution pump 12, holding tank 13, second solution pump 14, heat-exchanger rig 20, sustained release dosage urea soln conduit entrance 24 links to each other with urea soln pipeline 15; Described urea soln storage tank 16 links to each other with rotary drum granulator 18 with prilling tower 17 respectively through pipeline; Described holding tank 13 set inside have second whisking appliance 19.Be respectively arranged with tracing steam import 21 and tracing steam outlet 22 on the shell side of described heat-exchanger rig 20.Be provided with first valve 23 between described urea soln storage tank 16 and the prilling tower 17, the pipeline between the described urea soln storage tank 16 and first valve 23 is provided with sustained release dosage urea soln conduit entrance 24.Be provided with second valve 25 between described urea soln storage tank 16 and the rotary drum granulator 18, the pipeline between the described urea soln storage tank 16 and second valve 25 is provided with sustained release dosage urea soln conduit entrance 24.Be provided with hot-water valve 26 between described hot water storage tank 6 and the hot water inlet 2.Be provided with ethanolic soln valve 27 between described ethanolic soln storage tank 8 and the ethanolic soln import 4.Be provided with formaldehyde solution valve 28 between described formaldehyde solution storage tank 9 and the formaldehyde solution import 5.
Principle of work of the present invention is: sustained release dosage, formaldehyde solution, ethanolic soln and hot water are joined in the steel basin from the top of steel basin 1 according to a certain percentage; Be provided with first whisking appliance 10 in the steel basin 1; First whisking appliance 10 continues to stir 20 minutes; Material in the steel basin 1 dissolves evenly basically, utilizes first solution pump 12 that the sustained release dosage solution that stirs is driven in the holding tank 13 then; Be provided with second whisking appliance 19 in the holding tank 13, described second whisking appliance 19 continues to stir, and prevents the part species precipitate in the sustained release dosage solution, influences the homogeneity of sustained release dosage solution; Sustained release dosage solution in the holding tank 13 is driven in the urea soln pipeline more than 99.5% through second solution pump 14; Get into then in prilling tower 17 or the rotary drum granulator 18; Being to produce small particle urea when getting into prilling tower 17, is to produce granular urea when getting into rotary drum granulator 18; Described heat-exchanger rig 20 is arranged between second solution pump 14 and the sustained release dosage urea soln conduit entrance 24; Described heat-exchanger rig 20 utilizes the tracing steam heating sustained release dosage solution to 80 ℃-100 ℃ more than 120 ℃, can not cause the remarkable reduction of urea soln temperature after guaranteeing sustained release dosage solution and urea soln mixing.
The present invention both can guarantee the homogeneity of sustained release dosage solution ratio through whisking appliance and adding set, can make solution-stabilized the adding in the urea soln of sustained release dosage again, avoided causing the fluctuation of the slow release effect of slow-release carbamide product; Help the sustained release dosage dissolved substances through adding formaldehyde, ethanol etc. simultaneously, can reduce the usage quantity of water on the one hand, avoid the slow-release carbamide product moisture to exceed standard, also help to promote the solubleness and the intensity of slow-release carbamide product on the other hand.
The present invention is made up of following raw materials by weight portion: concentration is that 20 parts-50 parts of 855 parts-955 parts of urea solns, sustained release dosages, the concentration more than 99.5% is 15 parts-30 parts of 37% formaldehyde solutions, and 5 parts-15 parts of ethanol and temperature are 70 ℃ 5 parts-50 parts of hot water.
Its step of preparation method of the present invention is following:
One, with sustained release dosage, concentration be 37% formaldehyde solution, ethanol and temperature are that 70 ℃ hot water proportionally joins the steel basin from the top of steel basin 1;
Two, the mixing solutions in the steel basin in the step 11 was stirred 20 minutes-30 minutes, the mixing solutions after stirring is sent in the holding tank 13 through first solution pump 12;
Three, the mixing solutions in the holding tank in the step 2 13 is continued to stir, make the mixing solutions dissolving evenly;
Four, the mixing solutions that mixes in the holding tank in the step 3 13 is got in the urea soln pipeline 15 through second solution pump 14 and heat-exchanger rig 20;
Five, mixed urea soln in the urea soln pipeline 15 in the step 4 is linked to each other with prilling tower 17;
Six, mixed urea soln in the urea soln pipeline 15 in the step 4 is linked to each other with rotary drum granulator 18;
Seven, the urea soln in described step 5 and the step 6 is respectively through being finished product behind prilling tower 17 and the rotary drum granulator 18.Heat-exchanger rig 20 in the described step 4 is heated to 80 ℃-100 ℃ with the mixing solutions temperature.
Explanation the present invention for detailed enumerates following examples and describes, but the present invention is not limited to these embodiment.
Embodiment 1
Make the present invention of 1016.1 kilograms, needing concentration is that 50 kilograms of 955 kilograms of urea solns, sustained release dosages, concentration more than 99.5% is 30 kilograms of 37% formaldehyde solutions, and 15 kilograms of ethanol and temperature are 70 ℃ 50 kilograms of hot water.
One, with sustained release dosage, concentration be 37% formaldehyde solution, ethanol and temperature are that 70 ℃ hot water proportionally joins the steel basin from the top of steel basin 1;
Two, the mixing solutions in the steel basin in the step 11 was stirred 30 minutes, the mixing solutions after stirring is sent in the holding tank 13 through first solution pump 12;
Three, the mixing solutions in the holding tank in the step 2 13 is continued to stir, make the mixing solutions dissolving evenly;
Four, the mixing solutions that mixes in the holding tank in the step 3 13 is got in the urea soln pipeline 15 through second solution pump 14 and heat-exchanger rig 20;
Five, mixed urea soln in the urea soln pipeline 15 in the step 4 is linked to each other with prilling tower 17;
Six, the urea soln in the described step 5 is finished product after through prilling tower 17, and the finished product of gained is 1016.1 kilograms.Heat-exchanger rig 20 in the described step 4 is heated to 100 ℃ with the mixing solutions temperature.
Wherein concentration is to contain 18.9 kilograms moisture content in 37% the formaldehyde solution in the present embodiment, in prilling tower 17, is evaporated to gas; Temperature is that 70 ℃ hot water is evaporated to gas for 50 kilograms in prilling tower 17,15 kilograms of all volatilizations of ethanol.
Make the present invention of 1886.65 kilograms, needing concentration is that 70 kilograms of 1800 kilograms of urea solns, sustained release dosages, concentration more than 99.5% is 45 kilograms of 37% formaldehyde solutions, and 20 kilograms of ethanol and temperature are 70 ℃ 55 kilograms of hot water.
One, with sustained release dosage, concentration be 37% formaldehyde solution, ethanol and temperature are that 70 ℃ hot water proportionally joins the steel basin from the top of steel basin 1;
Two, the mixing solutions in the steel basin in the step 11 was stirred 25 minutes, the mixing solutions after stirring is sent in the holding tank 13 through first solution pump 12;
Three, the mixing solutions in the holding tank in the step 2 13 is continued to stir, make the mixing solutions dissolving evenly;
Four, the mixing solutions that mixes in the holding tank in the step 3 13 is got in the urea soln pipeline 15 through second solution pump 14 and heat-exchanger rig 20;
Five, mixed urea soln in the urea soln pipeline 15 in the step 4 is linked to each other with rotary drum granulator 18;
Six, the urea soln in the described step 5 is finished product after through rotary drum granulator 18, and the finished product of gained is 1886.65 kilograms.Heat-exchanger rig 20 in the described step 4 is heated to 90 ℃ with the mixing solutions temperature.
Wherein concentration is to contain 28.35 kilograms moisture content in 37% the formaldehyde solution in the present embodiment, in prilling tower 17, is evaporated to gas; Temperature is that 70 ℃ hot water is evaporated to gas for 55 kilograms in prilling tower 17,20 kilograms of all volatilizations of ethanol.
Embodiment 3
Make the present invention of 880.55 kilograms, needing concentration is that 20 kilograms of 855 kilograms of urea solns, sustained release dosages, concentration more than 99.5% is 15 kilograms of 37% formaldehyde solutions, and 5 kilograms of ethanol and temperature are 70 ℃ 5 kilograms of hot water.
One, with sustained release dosage, concentration be 37% formaldehyde solution, ethanol and temperature are that 70 ℃ hot water proportionally joins the steel basin from the top of steel basin 1;
Two, the mixing solutions in the steel basin in the step 11 was stirred 20 minutes, the mixing solutions after stirring is sent in the holding tank 13 through first solution pump 12;
Three, the mixing solutions in the holding tank in the step 2 13 is continued to stir, make the mixing solutions dissolving evenly;
Four, the mixing solutions that mixes in the holding tank in the step 3 13 is got in the urea soln pipeline 15 through second solution pump 14 and heat-exchanger rig 20;
Five, mixed urea soln in the urea soln pipeline 15 in the step 4 is linked to each other with prilling tower 17;
Six, mixed urea soln in the urea soln pipeline 15 in the step 4 is linked to each other with rotary drum granulator 18;
Seven, the urea soln in described step 5 and the step 6 is respectively through being finished product behind prilling tower 17 and the rotary drum granulator 18; The finished product that obtains through prilling tower 17 is 176.11 kilograms, and the finished product that obtains through rotary drum granulator 18 is 704.44.Heat-exchanger rig 20 in the described step 4 is heated to 80 ℃ with the mixing solutions temperature.
Wherein concentration is to contain 9.45 kilograms moisture content in 37% the formaldehyde solution in the present embodiment, in prilling tower 17, is evaporated to gas; Temperature is that 70 ℃ hot water is evaporated to gas for 5 kilograms in prilling tower 17,5 kilograms of all volatilizations of ethanol.
Claims (3)
1. slow-release carbamide; It is characterized in that: be made up of following raw materials by weight portion: concentration is that 20 parts-50 parts of 855 parts-955 parts of urea solns, sustained release dosages, the concentration more than 99.5% is 15 parts-30 parts of 37% formaldehyde solutions, and 5 parts-15 parts of ethanol and temperature are 70 ℃ 5 parts-50 parts of hot water.
2. the preparation method of a slow-release carbamide, it is characterized in that: its step is following:
One, with sustained release dosage, concentration be 37% formaldehyde solution, ethanol and temperature are that 70 ℃ hot water proportionally joins the steel basin from the top of steel basin (1);
Two, the mixing solutions in the steel basin in the step 1 (1) was stirred 20 minutes-30 minutes, the mixing solutions after stirring is sent in the holding tank (13) through first solution pump (12);
Three, the mixing solutions in the holding tank in the step 2 (13) is continued to stir, make the mixing solutions dissolving evenly;
Four, the mixing solutions that mixes in the holding tank in the step 3 (13) is got in the urea soln pipeline (15) through second solution pump (14) and heat-exchanger rig (20);
Five, mixed urea soln in the urea soln pipeline (15) in the step 4 is linked to each other with prilling tower (17);
Six, mixed urea soln in the urea soln pipeline (15) in the step 4 is linked to each other with rotary drum granulator (18);
Seven, the urea soln in described step 5 and the step 6 is respectively through being finished product behind prilling tower (17) and the rotary drum granulator (18).
3. the preparation method of slow-release carbamide according to claim 1, it is characterized in that: the heat-exchanger rig in the described step 4 (20) is heated to 80 ℃-100 ℃ with the mixing solutions temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210235027.XA CN102701889B (en) | 2012-07-09 | 2012-07-09 | Slow-release urea and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210235027.XA CN102701889B (en) | 2012-07-09 | 2012-07-09 | Slow-release urea and preparation method thereof |
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| CN102701889A true CN102701889A (en) | 2012-10-03 |
| CN102701889B CN102701889B (en) | 2014-04-02 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165801A (en) * | 1996-05-19 | 1997-11-26 | 原俊钦 | Coated synergistic urea |
| CN1173482A (en) * | 1997-08-29 | 1998-02-18 | 河北省沧州大化集团有限责任公司 | Controllable slowly-released granular urea fertilizer and its prepn. method |
| CN201908052U (en) * | 2010-12-17 | 2011-07-27 | 安徽三星化工有限责任公司 | Preparation device for sustained slow-release fertilizer |
-
2012
- 2012-07-09 CN CN201210235027.XA patent/CN102701889B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165801A (en) * | 1996-05-19 | 1997-11-26 | 原俊钦 | Coated synergistic urea |
| CN1173482A (en) * | 1997-08-29 | 1998-02-18 | 河北省沧州大化集团有限责任公司 | Controllable slowly-released granular urea fertilizer and its prepn. method |
| CN201908052U (en) * | 2010-12-17 | 2011-07-27 | 安徽三星化工有限责任公司 | Preparation device for sustained slow-release fertilizer |
Non-Patent Citations (1)
| Title |
|---|
| 吴中等: "长效缓释尿素的生产运用", 《第十三届全国大型尿素装置技术大会》 * |
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Address after: 453731 Xinxiang Economic Development Zone, Henan Province (Xiaoji Town) Patentee after: Henan Xinlianxin Chemical Industry Group Co., Ltd. Address before: 453731 Henan Xinxiang Economic Development Zone Xiaoji Town Henan Xinlianxin Chemical Fertilizer Co., Ltd. Patentee before: Henan XInlianxin Fertiliser Limited Company |
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Effective date of registration: 20200408 Address after: 453731 Xinxiang Economic Development Zone, Henan Province (Xiaoji Town) Co-patentee after: Jiujiang Xinlianxin Chemical Fertilizer Co.,Ltd. Patentee after: Henan Xinlianxin Chemical Industry Group Co.,Ltd. Co-patentee after: XINJIANG XINLIANXIN ENERGY CHEMICAL Co.,Ltd. Address before: 453731 Xinxiang Economic Development Zone, Henan Province (Xiaoji Town) Patentee before: Henan Xinlianxin Chemical Industry Group Co.,Ltd. |
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Address after: 453731 Xinxiang City, Henan Province Economic Development Zone (Xiaoji town) Patentee after: Henan Xinlianxin Chemical Industry Group Co.,Ltd. Patentee after: Jiangxi xinlianxin Chemical Industry Co.,Ltd. Patentee after: XINJIANG XINLIANXIN ENERGY CHEMICAL Co.,Ltd. Address before: 453731 Xinxiang City, Henan Province Economic Development Zone (Xiaoji town) Patentee before: Henan Xinlianxin Chemical Industry Group Co.,Ltd. Patentee before: Jiujiang Xinlianxin Chemical Fertilizer Co.,Ltd. Patentee before: XINJIANG XINLIANXIN ENERGY CHEMICAL Co.,Ltd. |
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