CN100551511C - Urea granulation process - Google Patents
Urea granulation process Download PDFInfo
- Publication number
- CN100551511C CN100551511C CNB2005800094900A CN200580009490A CN100551511C CN 100551511 C CN100551511 C CN 100551511C CN B2005800094900 A CNB2005800094900 A CN B2005800094900A CN 200580009490 A CN200580009490 A CN 200580009490A CN 100551511 C CN100551511 C CN 100551511C
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- China
- Prior art keywords
- urea
- comminutor
- pelletizing additives
- formaldehyde
- particle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
- C05C9/005—Post-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fertilizers (AREA)
- Glanulating (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
Contain the urea granulation process in the comminutor of nuclei; in comminutor, add urea melt and at least a pelletizing additives; wherein said nuclei is transported; adding urea melt with the vertical direction of direction that transports of stating nuclei; wherein, pelletizing additives is supplied to the latter end part of comminutor at least in part.
Description
Technical field
The present invention relates to urea granulation process; this technology is carried out in comprising the comminutor of nuclei; urea melt and at least a pelletizing additives are added in the comminutor, and wherein nuclei is transported and urea melt is added transporting the vertical direction of direction with nuclei.
Background technology
Such urea granulation process is described in Encyclopedia of Chemical Technology, the third edition, and the 23rd volume is in the 566-572 page or leaf.The document has been discussed the Cominco granulating technique, curtain (falling-curtain) granulating technique, NSM granulating technique and MitsuiToatsu-Toyo Engineering granulating technique fall in TVA, and wherein granulation is carried out in the above described manner.
Cominco granulating technique and TVA fall the curtain granulating technique and adopt comminutor; wherein rotary drum around the rotation of its longitudinal axis so that by comminutor, and there is the injector that is used to spray urea melt in the nuclear transportation that will supply with in comminutor beginning part (beginning) on most of length of rotary drum.In NSM granulating technique and Mitsui Toatsu-Toyo Engineering granulating technique; nuclear is introduced into fluid bed and transports therein; by injector urea melt is injected in the fluid bed, so nucleus growth is to form particle along most of length setting of fluid bed.
Known in these granulating techniques, before urea melt is supplied to comminutor, can be to wherein adding formaldehyde or other pelletizing additives, thus improve granulation and strengthen the character of urea granules.
The shortcoming of already known processes is for the improvement that obtains expecting, with respect to urea melt, to need to add considerable pelletizing additives.
Summary of the invention
The objective of the invention is, under the condition of the urea granules that obtains having congruence property, reduce amount with respect to the pelletizing additives of urea melt.
The invention is characterized in that pelletizing additives is supplied to the latter end part (last section) of comminutor at least in part.In this way, the urea granules that only needs less pelletizing additives can obtain having good character.This is favourable, and reason is that pelletizing additives costs an arm and a leg, and its addition has a significant impact the cost tool of urea granulation.
The comminutor that is used for granulation urea comprises shell, and nuclear is supplied to a side of this shell.In addition, comminutor comprises and will be transported to the device of the opposite side of shell from the particle of authorizing generate.In rotary drum granulator, the rotation by rotary drum granulator produces particle and transports, and by the blade that exists in the rotary drum granulator particle is moved.
In fluidized bed pelletizer, fluid bed is positioned at the distribution grid top.Keep fluid bed with the fluidization air of supplying with by distribution grid.In fluidized bed pelletizer, use the supplying party of the fluidization air by distribution grid always to control particle transporting in comminutor.Urea melt is from being supplied to comminutor with the vertical direction of direction that transports of nuclear and urea granules.Herein vertically be meant the angle that direction is 70-110 ° that transports with nuclear and urea granules.
Injector or the distributor arranged by the almost whole comminutor length in edge are supplied to urea melt in the comminutor.According to technology of the present invention, pelletizing additives is supplied to the latter end part (that is, last injector or the residing part of urea melt distributor) of comminutor at least in part.
Except the latter end pelletizing additives partly that is supplied to comminutor; a part of pelletizing additives can also be supplied to the previous section (preceding section) of comminutor, this for example can realize by before being added into comminutor at a part of pelletizing additives it being mixed with urea melt.The latter end that pelletizing additives is added into comminutor at least in part partly is meant, adds at least 50% pelletizing additives at this.Preferably, at least 70% pelletizing additives is supplied to the latter end part of comminutor.
Can supply with pelletizing additives and urea melt respectively, but preferably, be supplied at pelletizing additives before the latter end part of comminutor, it is mixed with urea melt.
Position after the latter end part of comminutor and before particle leaves comminutor, comminutor generally includes a zone of not supplying with urea melt.In this zone, particle is cooled.
The example of pelletizing additives is formaldehyde, hydroxymethyl urea, formaldehyde-urea condensate (formurea), hexa.Preferred formaldehyde is used to improve the mechanical strength of urea granules and reduces the trend (caking behavior) that urea granules adheres to each other between the storage life as pelletizing additives.Formaldehyde can be added with the form of gaseous formaldehyde, formalin, paraformaldehyde, paraformaldehyde solution or urea-formaldehyde precondensate.
Formaldehyde is added with the form of formaldehyde precondensate usually.The formaldehyde precondensate comprises for example formaldehyde of 60wt%.With respect to the urea that is added, the formaldehyde of preferred 0.01-0.4wt% is added into urea melt.
The invention still further relates to the urea granules that comprises pelletizing additives.
At Encyclopedia of Chemical Technology, the third edition, the 23rd volume; in the technology described in the 566-572 page or leaf; add pelletizing additives on whole length of comminutor, result, the concentration of pelletizing additives are identical in whole urea granules.Known in existing technology, after forming urea granules (coming down to after granulation is finished), pelletizing additives is distributed on the surface of urea granules.Therefore, after the so a kind of technology of process, pelletizing additives exists only in the surface of urea granules.
Technology of the present invention can guarantee that the concentration of the pelletizing additives that exists in the particle is the highest at the skin of particle.Pelletizing additives not only is present in the surface of particle, and solidifies with urea melt at the particle skin.Pelletizing additives also may reside in other parts of particle.
Preferably, the concentration of the pelletizing additives that exists in the particle increases progressively from core to the outer surface of particle.
Particle of the present invention preferably comprises the formaldehyde with respect to the 0.01-0.4wt% of urea.
Description of drawings
Fig. 1 shows urea granulation process of the present invention.
The specific embodiment
Fig. 1 shows comminutor, wherein almost all having injector (S) on the length, is used to add the urea melt (U) that is derived from urea plant or urea melt holding vessel.To examine (N) from the distribution grid top is supplied to the comminutor.Supply with fluidization air (A) from the distribution grid below, (A) is supplied to each injector with secondary air.
In the rearmost end (end) of comminutor, particle (G) is discharged from.Pelletizing additives (D) all is added into the supply pipeline that links to each other with last injector.
Comparative experiment A
In urea granulation process, contain the solution (UFC of formaldehyde as Fig. 1
) the direct urea melt (U) that after the evaporimeter of urea plant, is added into.The amount of the solution that contains formaldehyde that is added can make and obtain urea granules after the granulation and comprise formaldehyde with respect to the 0.4wt% of urea.Obtain urea granules, formaldehyde evenly distributes therein.LRX with Lloyds instrument company (Lloyds Instruments)
+The type instrument is measured the compressive resistance of particle, is the particle of 2.85mm for diameter, records this value and is 4.8kgf.
Almost there is not dust to form during transporting and handle particle.
Embodiment 1
In urea granulation process, contain the solution (UFC of formaldehyde as Fig. 1
) the direct urea melt (U) that after the evaporimeter of urea plant, partly is added into, and the D place partly is added into urea melt in Fig. 1.Directly the amount of the solution that contains formaldehyde that adds after evaporimeter is 1: 2.5 with the ratio of the amount of D place interpolation.The total amount of the solution that contains formaldehyde that is added can make and obtain urea granules after the granulation and comprise formaldehyde with respect to the 0.2wt% of urea.Obtain urea granules, wherein the outer field concentration of formaldehyde of particle is higher by 30% than the concentration of particle central authorities approximately.
According to the described method of Comparative experiment A the compressive resistance of particle is measured, recorded this value and be 4.8kgf.
Almost there is not dust to form during transporting and handling.Aspect dust formation, the product of present embodiment is suitable with the product of Comparative experiment A.
Claims (8)
1. contain the urea granulation process in the comminutor of nuclei; in described comminutor, add urea melt and at least a pelletizing additives; wherein said nuclei is transported; adding described urea melt with the vertical direction of direction that transports of described nuclei; it is characterized in that the described pelletizing additives of 70wt% is supplied to the latter end part of described comminutor at least.
2. technology as claimed in claim 1 is characterized in that, is supplied at described pelletizing additives before the latter end part of described comminutor, and it is mixed with described urea melt.
3. as any one technology among the claim 1-2, it is characterized in that described pelletizing additives is a formaldehyde.
4. technology as claimed in claim 3 is characterized in that, with respect to urea, the formaldehyde of 0.01-0.4wt% is added into described urea melt.
5. the urea granules that can obtain by the technology of claim 1 it is characterized in that the concentration of described pelletizing additives is the highest at the skin of described particle, and described pelletizing additives solidifies with described urea melt at the skin of described particle.
6. urea granules as claimed in claim 5 is characterized in that described pelletizing additives is present in whole particle, makes the concentration of described pelletizing additives increase progressively from core to outer surface.
7. as the urea granules of claim 5 or 6, it is characterized in that described pelletizing additives is a formaldehyde.
8. urea granules as claimed in claim 7 is characterized in that described particle comprises the formaldehyde of the 0.01-0.4wt% of relative urea.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1025805 | 2004-03-25 | ||
| NL1025805A NL1025805C2 (en) | 2004-03-25 | 2004-03-25 | Process for the granulation of urea. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1933900A CN1933900A (en) | 2007-03-21 |
| CN100551511C true CN100551511C (en) | 2009-10-21 |
Family
ID=34960584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800094900A Active CN100551511C (en) | 2004-03-25 | 2005-02-24 | Urea granulation process |
Country Status (8)
| Country | Link |
|---|---|
| CN (1) | CN100551511C (en) |
| AR (1) | AR049627A1 (en) |
| CA (1) | CA2553755C (en) |
| EA (1) | EA008602B1 (en) |
| EG (1) | EG26185A (en) |
| MY (1) | MY166037A (en) |
| NL (1) | NL1025805C2 (en) |
| WO (1) | WO2005092486A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2431346A1 (en) * | 2010-09-15 | 2012-03-21 | Uhde Fertilizer Technology B.V. | Method for producing urea fertilizer with low moisture absorption tendencies |
| EP2489429A1 (en) * | 2011-02-21 | 2012-08-22 | Urea Casale S.A. | Fluid bed granulation of urea and related apparatus |
| EP3095770A1 (en) * | 2015-05-21 | 2016-11-23 | Casale SA | Process for the production of combined fertilizers |
| EP3594194A1 (en) | 2018-07-12 | 2020-01-15 | Casale Sa | Urea granulation process |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB944875A (en) * | 1959-09-14 | 1963-12-18 | Ici Ltd | Improvements in and relating to urea |
| DE1916368A1 (en) * | 1969-03-29 | 1970-10-01 | Veba Chemie Nord Gmbh | Slow-acting fertilizers |
| JPS5330689B1 (en) * | 1970-03-16 | 1978-08-29 | ||
| CA1101641A (en) * | 1977-06-09 | 1981-05-26 | Anton Niks | Urea granulation |
| JP2515888B2 (en) * | 1989-08-09 | 1996-07-10 | 鹿島建設株式会社 | Construction method of steel pipe pile for building offshore structure and its equipment |
| RU2104258C1 (en) * | 1992-08-07 | 1998-02-10 | Хидро Агри Слейскил Б.В. | Method of granulated urea production |
| JPH09169717A (en) * | 1995-12-19 | 1997-06-30 | Toyo Eng Corp | Production of large granule urea |
| JP3667418B2 (en) * | 1996-02-01 | 2005-07-06 | 東洋エンジニアリング株式会社 | Method for producing granular urea |
-
2004
- 2004-03-25 NL NL1025805A patent/NL1025805C2/en not_active IP Right Cessation
-
2005
- 2005-02-24 CA CA2553755A patent/CA2553755C/en active Active
- 2005-02-24 EA EA200601764A patent/EA008602B1/en not_active IP Right Cessation
- 2005-02-24 WO PCT/NL2005/000136 patent/WO2005092486A1/en active Application Filing
- 2005-02-24 CN CNB2005800094900A patent/CN100551511C/en active Active
- 2005-03-23 AR ARP050101183A patent/AR049627A1/en active IP Right Grant
- 2005-03-24 MY MYPI20051297A patent/MY166037A/en unknown
-
2006
- 2006-09-24 EG EGPCTNA2006000915A patent/EG26185A/en active
Also Published As
| Publication number | Publication date |
|---|---|
| CN1933900A (en) | 2007-03-21 |
| CA2553755C (en) | 2013-12-03 |
| NL1025805C2 (en) | 2005-09-27 |
| EA008602B1 (en) | 2007-06-29 |
| WO2005092486A1 (en) | 2005-10-06 |
| CA2553755A1 (en) | 2005-10-06 |
| EG26185A (en) | 2013-04-07 |
| AR049627A1 (en) | 2006-08-23 |
| EA200601764A1 (en) | 2007-02-27 |
| MY166037A (en) | 2018-05-21 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STAMICARBON CO., LTD. Free format text: FORMER OWNER: DSM IP ASSETS BV Effective date: 20110105 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: HEERLEN, HOLLAND TO: SITTARD, HOLLAND |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110105 Address after: Holland Stadium Patentee after: STAMICARBON B.V. Address before: Holland Heerlen Patentee before: DSM IP ASSETS B.V. |