CN102701889B - Slow-release urea and preparation method thereof - Google Patents
Slow-release urea and preparation method thereof Download PDFInfo
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- CN102701889B CN102701889B CN201210235027.XA CN201210235027A CN102701889B CN 102701889 B CN102701889 B CN 102701889B CN 201210235027 A CN201210235027 A CN 201210235027A CN 102701889 B CN102701889 B CN 102701889B
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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, technique is simple, slow-release carbamide of the low and had good sustained release effect of running cost and preparation method thereof.
Background technology
China is maximum in the world fertiliser production at present and uses country, yet research shows that present stage China's fertilizer farmland nutrient utilization ratio is totally lower, particularly utilization rate of nitrogen fertilizer is only 30% left and right, 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 are all solid, powdery, and wherein comparison of ingredients is complicated, if directly utilize powder body pump to join, in urea soln, be easy to bring into air, and it is even to be difficult to proportioning.
Summary of the invention
The object of the invention is to overcome defect of the prior art and provide a kind of less investment, technique simple, slow-release carbamide of the low and had good sustained release effect of running cost and preparation method thereof.
The object of the present invention is achieved like this: the present invention is comprised of following raw materials by weight portion: 15 parts-30 parts of the formaldehyde solutions that concentration is more than 99.5% 20 parts-50 parts of 855 parts-955 parts of urea solns, sustained release dosages, concentration is 37%, 5 parts-15 parts of ethanol and temperature are 5 parts-50 parts of the hot water of 70 ℃.
Its step of preparation method of the present invention is as follows:
One, the formaldehyde solution that is 37% by sustained release dosage, concentration, ethanol and temperature are that the hot water of 70 ℃ proportionally joins steel basin from the top of steel basin; Two, the mixing solutions in the steel basin in step 1 is stirred 20 minutes-30 minutes, the mixing solutions after stirring is pumped in holding tank by the first solution; Three, the mixing solutions in the holding tank in step 2 is continued to stir, mixing solutions is uniformly dissolved; Four, the mixing solutions mixing in the holding tank in step 3 is entered in urea soln pipeline by the second solution pump and heat-exchanger rig; Five, mixed urea soln in the urea soln pipeline in step 4 is connected with prilling tower; Six, mixed urea soln in the urea soln pipeline in step 4 is connected with rotary drum granulator; Seven, described step 5 and the urea soln in step 6 are respectively by being finished product after prilling tower and rotary drum granulator.Heat-exchanger rig in described step 4 is heated to 80 ℃-100 ℃ by mixing solutions temperature.
The present invention compares with other technologies to be had 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 increases approximately 100 yuan, and urea product water leaching slow release effect can reach 60%.It is nitrated that the slow-release carbamide that the nitrification inhibitor of take in existing slow-release carbamide is additive can only accomplish to suppress urea, cannot accomplish the deliquescent slowly-releasing of urea water; The urea that the resin dressing of take is sustained release additives, before dressing breaks, cannot discharge urea, once dressing breaks, urea is easy to just by water-soluble, be taken off, and cannot accomplish the N element supply to farm crop for a long time.Resin dressing is expensive technique generally acknowledged in current slow-release carbamide, one ton of slow-release carbamide of every production, and cost increases more than 110 yuan, and nitrification inhibitor relatively our sustained release dosage is also high.One ton of urea of every production, cost increases by 120 yuan of left and right.
The present invention has less investment, technique is simple, the advantage of the low and had good sustained release effect of running cost.
Accompanying drawing explanation
Fig. 1 is 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 is connected with formaldehyde solution storage tank 9; Described steel basin 1 inside is provided with the first agitator 10, described steel basin bottom is provided with steel basin taphole 11, described steel basin taphole 11 by pipeline successively with the first solution pump 12, holding tank 13, the second solution pump 14, heat-exchanger rig 20, sustained release dosage urea soln conduit entrance 24 is connected with urea soln pipeline 15; Described urea soln storage tank 16 is connected with rotary drum granulator 18 with prilling tower 17 respectively by pipeline; Described holding tank 13 inside are provided with the second agitator 19.On the shell side of described heat-exchanger rig 20, be respectively arranged with tracing steam import 21 and tracing steam outlet 22.Between described urea soln storage tank 16 and prilling tower 17, be provided with the first valve 23, on the pipeline between described urea soln storage tank 16 and the first valve 23, be provided with sustained release dosage urea soln conduit entrance 24.Between described urea soln storage tank 16 and rotary drum granulator 18, be provided with the second valve 25, on the pipeline between described urea soln storage tank 16 and the second valve 25, be provided with sustained release dosage urea soln conduit entrance 24.Between described hot water storage tank 6 and hot water inlet 2, be provided with hot-water valve 26.Between described ethanolic soln storage tank 8 and ethanolic soln import 4, be provided with ethanolic soln valve 27.Between described formaldehyde solution storage tank 9 and formaldehyde solution import 5, be provided with formaldehyde solution valve 28.
Principle of work of the present invention is: sustained release dosage, formaldehyde solution, ethanolic soln and hot water are joined in steel basin from the top of steel basin 1 according to a certain percentage, in steel basin 1, be provided with the first agitator 10, the first agitator 10 continues to stir 20 minutes, material in steel basin 1 is uniformly dissolved substantially, then utilizes the first solution pump 12 that the sustained release dosage solution stirring is driven in holding tank 13; In holding tank 13, be provided with the second agitator 19, the second described agitator 19 continues to stir, and prevents the part species precipitate in sustained release dosage solution, affects the homogeneity of sustained release dosage solution; Sustained release dosage solution in holding tank 13 is driven in more than 99.5% urea soln pipeline through the second solution pump 14, then enter in prilling tower 17 or rotary drum granulator 18, while entering prilling tower 17, being to produce small particle urea, is to produce granular urea while entering rotary drum granulator 18; Described heat-exchanger rig 20 is arranged between the second solution pump 14 and sustained release dosage urea soln conduit entrance 24; described heat-exchanger rig 20 utilizes 120 ℃ of above tracing steams heating sustained release dosage solution to 80 ℃-100 ℃, guarantees can not cause after sustained release dosage solution mixes with urea soln the remarkable reduction of urea soln temperature.
The present invention, by agitator and adding set, both can guarantee the homogeneity of sustained release dosage solution ratio, can make again solution-stabilized the adding in urea soln of sustained release dosage, avoids causing the fluctuation of the slow release effect of slow-release carbamide product; By the material that adds formaldehyde, ethanol etc. to help sustained release dosage to dissolve, can reduce on the one hand the usage quantity of water simultaneously, avoid slow-release carbamide product moisture to exceed standard, also contribute on the other hand to promote solubleness and the intensity of slow-release carbamide product.
The present invention is comprised of following raw materials by weight portion: 15 parts-30 parts of the formaldehyde solutions that concentration is more than 99.5% 20 parts-50 parts of 855 parts-955 parts of urea solns, sustained release dosages, concentration is 37%, 5 parts-15 parts of ethanol and temperature are 5 parts-50 parts of the hot water of 70 ℃.
Its step of preparation method of the present invention is as follows:
One, the formaldehyde solution that is 37% by sustained release dosage, concentration, ethanol and temperature are that the hot water of 70 ℃ proportionally joins steel basin from the top of steel basin 1;
Two, the mixing solutions in the steel basin in step 11 is stirred 20 minutes-30 minutes, the mixing solutions after stirring is sent in holding tank 13 by the first solution pump 12;
Three, the mixing solutions in the holding tank in step 2 13 is continued to stir, mixing solutions is uniformly dissolved;
Four, the mixing solutions mixing in the holding tank in step 3 13 is entered in urea soln pipeline 15 by the second solution pump 14 and heat-exchanger rig 20;
Five, mixed urea soln in the urea soln pipeline 15 in step 4 is connected with prilling tower 17;
Six, mixed urea soln in the urea soln pipeline 15 in step 4 is connected with rotary drum granulator 18;
Seven, described step 5 and the urea soln in step 6 are respectively by being finished product after prilling tower 17 and rotary drum granulator 18.Heat-exchanger rig 20 in described step 4 is heated to 80 ℃-100 ℃ by 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, need 30 kilograms of the formaldehyde solutions that concentration is more than 99.5% 50 kilograms of 955 kilograms of urea solns, sustained release dosages, concentration is 37%, 15 kilograms of ethanol and temperature are 50 kilograms of the hot water of 70 ℃.
One, the formaldehyde solution that is 37% by sustained release dosage, concentration, ethanol and temperature are that the hot water of 70 ℃ proportionally joins steel basin from the top of steel basin 1;
Two, the mixing solutions in the steel basin in step 11 is stirred 30 minutes, the mixing solutions after stirring is sent in holding tank 13 by the first solution pump 12;
Three, the mixing solutions in the holding tank in step 2 13 is continued to stir, mixing solutions is uniformly dissolved;
Four, the mixing solutions mixing in the holding tank in step 3 13 is entered in urea soln pipeline 15 by the second solution pump 14 and heat-exchanger rig 20;
Five, mixed urea soln in the urea soln pipeline 15 in step 4 is connected with prilling tower 17;
Six, the urea soln in described step 5 is finished product after by prilling tower 17, and the finished product of gained is 1016.1 kilograms.Heat-exchanger rig 20 in described step 4 is heated to 100 ℃ by mixing solutions temperature.
The moisture content that contains 18.9 kilograms in the formaldehyde solution that wherein in the present embodiment, concentration is 37% is evaporated to gas in prilling tower 17; Temperature is that 50 kilograms of the hot water of 70 ℃ are evaporated to gas in prilling tower 17,15 kilograms of all volatilizations of ethanol.
Make the present invention of 1886.65 kilograms, need 45 kilograms of the formaldehyde solutions that concentration is more than 99.5% 70 kilograms of 1800 kilograms of urea solns, sustained release dosages, concentration is 37%, 20 kilograms of ethanol and temperature are 55 kilograms of the hot water of 70 ℃.
One, the formaldehyde solution that is 37% by sustained release dosage, concentration, ethanol and temperature are that the hot water of 70 ℃ proportionally joins steel basin from the top of steel basin 1;
Two, the mixing solutions in the steel basin in step 11 is stirred 25 minutes, the mixing solutions after stirring is sent in holding tank 13 by the first solution pump 12;
Three, the mixing solutions in the holding tank in step 2 13 is continued to stir, mixing solutions is uniformly dissolved;
Four, the mixing solutions mixing in the holding tank in step 3 13 is entered in urea soln pipeline 15 by the second solution pump 14 and heat-exchanger rig 20;
Five, mixed urea soln in the urea soln pipeline 15 in step 4 is connected with rotary drum granulator 18;
Six, the urea soln in described step 5 is finished product after by rotary drum granulator 18, and the finished product of gained is 1886.65 kilograms.Heat-exchanger rig 20 in described step 4 is heated to 90 ℃ by mixing solutions temperature.
The moisture content that contains 28.35 kilograms in the formaldehyde solution that wherein in the present embodiment, concentration is 37% is evaporated to gas in prilling tower 17; Temperature is that 55 kilograms of the hot water of 70 ℃ are evaporated to gas in prilling tower 17,20 kilograms of all volatilizations of ethanol.
Embodiment 3
Make the present invention of 880.55 kilograms, need 15 kilograms of the formaldehyde solutions that concentration is more than 99.5% 20 kilograms of 855 kilograms of urea solns, sustained release dosages, concentration is 37%, 5 kilograms of ethanol and temperature are 5 kilograms of the hot water of 70 ℃.
One, the formaldehyde solution that is 37% by sustained release dosage, concentration, ethanol and temperature are that the hot water of 70 ℃ proportionally joins steel basin from the top of steel basin 1;
Two, the mixing solutions in the steel basin in step 11 is stirred 20 minutes, the mixing solutions after stirring is sent in holding tank 13 by the first solution pump 12;
Three, the mixing solutions in the holding tank in step 2 13 is continued to stir, mixing solutions is uniformly dissolved;
Four, the mixing solutions mixing in the holding tank in step 3 13 is entered in urea soln pipeline 15 by the second solution pump 14 and heat-exchanger rig 20;
Five, mixed urea soln in the urea soln pipeline 15 in step 4 is connected with prilling tower 17;
Six, mixed urea soln in the urea soln pipeline 15 in step 4 is connected with rotary drum granulator 18;
Seven, described step 5 and the urea soln in step 6 are respectively by being finished product after prilling tower 17 and rotary drum granulator 18; The finished product obtaining by prilling tower 17 is 176.11 kilograms, and the finished product obtaining by rotary drum granulator 18 is 704.44.Heat-exchanger rig 20 in described step 4 is heated to 80 ℃ by mixing solutions temperature.
The moisture content that contains 9.45 kilograms in the formaldehyde solution that wherein in the present embodiment, concentration is 37% is evaporated to gas in prilling tower 17; Temperature is that 5 kilograms of the hot water of 70 ℃ are evaporated to gas in prilling tower 17,5 kilograms of all volatilizations of ethanol.
Claims (2)
1. a slow-release carbamide, it is characterized in that: by following raw materials by weight portion, formed: 15 parts-30 parts of the formaldehyde solutions that concentration is more than 99.5% 20 parts-50 parts of 855 parts-955 parts of urea solns, sustained release dosages, concentration is 37%, 5 parts-15 parts of ethanol and temperature are 5 parts-50 parts of the hot water of 70 ℃.
2. the preparation method of slow-release carbamide as claimed in claim 1, is characterized in that: its step is as follows:
One, the formaldehyde solution that is 37% by sustained release dosage, concentration, ethanol and temperature are that the hot water of 70 ℃ proportionally joins steel basin from the top of steel basin (1);
Two, the mixing solutions in the steel basin in step 1 (1) is stirred 20 minutes-30 minutes, the mixing solutions after stirring is sent in holding tank (13) by the first solution pump (12);
Three, the mixing solutions in the holding tank in step 2 (13) is continued to stir, mixing solutions is uniformly dissolved;
Four, the mixing solutions mixing in the holding tank in step 3 (13) is entered in urea soln pipeline (15) by the second solution pump (14) and heat-exchanger rig (20);
Five, mixed urea soln in the urea soln pipeline (15) in step 4 is connected with prilling tower (17);
Six, mixed urea soln in the urea soln pipeline (15) in step 4 is connected with rotary drum granulator (18);
Seven, described step 5 and the urea soln in step 6 are respectively by being finished product after prilling tower (17) and rotary drum granulator (18);
Heat-exchanger rig in described step 4 (20) is heated to 80 ℃-100 ℃ by mixing solutions temperature.
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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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| CN201210235027.XA CN102701889B (en) | 2012-07-09 | 2012-07-09 | Slow-release urea and preparation method thereof |
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| CN102701889B true 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 |
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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 (2)
| 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》.2004,第184-186页. |
| 长效缓释尿素的生产运用;吴中等;《第十三届全国大型尿素装置技术大会》;20041231;第184-186页 * |
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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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