CN1933900A - Urea granulation process - Google Patents

Urea granulation process Download PDF

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Publication number
CN1933900A
CN1933900A CNA2005800094900A CN200580009490A CN1933900A CN 1933900 A CN1933900 A CN 1933900A CN A2005800094900 A CNA2005800094900 A CN A2005800094900A CN 200580009490 A CN200580009490 A CN 200580009490A CN 1933900 A CN1933900 A CN 1933900A
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CN
China
Prior art keywords
urea
comminutor
pelletizing additives
formaldehyde
particle
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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.)
Granted
Application number
CNA2005800094900A
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Chinese (zh)
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CN100551511C (en
Inventor
约瑟夫·休伯特·梅森
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Stamicarbon BV
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DSM IP Assets BV
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Publication of CN1933900A publication Critical patent/CN1933900A/en
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Publication of CN100551511C publication Critical patent/CN100551511C/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • C05C9/005—Post-treatment
    • 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
    • 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

Urea granulation process in a granulator that contains urea nuclei, to which a urea melt and at least one granulation additive are added, wherein the urea nuclei are transported and the urea melt is added perpendicularly to the direction of transport of the urea nuclei, wherein the granulation additive is at least partially supplied to the last section of the granulator.

Description

Urea granulation process
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.
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.
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, 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.
Fig. 1 shows urea granulation process of the present invention.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 the urea granulation process as Fig. 1, (UFC 85 to contain the solution of formaldehyde ) 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 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 the urea granulation process as Fig. 1, (UFC 85 to contain the solution of formaldehyde ) 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 (9)

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 pelletizing additives is supplied to the latter end part of described comminutor at least in part.
2. technology as claimed in claim 1 is characterized in that, the described pelletizing additives of 70wt% is supplied to the latter end part of described comminutor at least.
3. as the technology of claim 1 or 2, it is characterized in that, be supplied at described pelletizing additives before the latter end part of described comminutor, it is mixed with described urea melt.
4. as any one technology among the claim 1-3, it is characterized in that described pelletizing additives is a formaldehyde.
5. as any one technology among the claim 1-4, it is characterized in that with respect to urea, the formaldehyde of 0.01-0.4wt% is added into described urea melt.
6. contain the urea granules of pelletizing additives, it is characterized in that, the concentration of described pelletizing additives is the highest at the skin of described particle.
7. urea granules as claimed in claim 6 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.
8. as the urea granules of claim 6 or 7, it is characterized in that described pelletizing additives is a formaldehyde.
9. as any one urea granules among the claim 6-8, it is characterized in that described particle comprises the formaldehyde of the 0.01-0.4wt% of relative urea.
CNB2005800094900A 2004-03-25 2005-02-24 Urea granulation process Active CN100551511C (en)

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 true CN1933900A (en) 2007-03-21
CN100551511C CN100551511C (en) 2009-10-21

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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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103384560A (en) * 2011-02-21 2013-11-06 卡萨尔尿素公司 Fluid bed granulation of urea and related apparatus
CN112041287A (en) * 2018-07-12 2020-12-04 卡萨乐有限公司 Urea granulation process

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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
EP3095770A1 (en) * 2015-05-21 2016-11-23 Casale SA Process for the production of combined fertilizers

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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
AT363954B (en) * 1977-06-09 1981-09-10 Azote Sa Cie Neerlandaise METHOD FOR THE PRODUCTION OF UREA GRAINS
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
RO113007B1 (en) * 1992-08-07 1998-03-30 Hydro Agri Sluiskil Bv Process for producing urea granules
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103384560A (en) * 2011-02-21 2013-11-06 卡萨尔尿素公司 Fluid bed granulation of urea and related apparatus
CN112041287A (en) * 2018-07-12 2020-12-04 卡萨乐有限公司 Urea granulation process
CN112041287B (en) * 2018-07-12 2024-01-05 卡萨乐有限公司 Urea granulation process

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Publication number Publication date
CA2553755A1 (en) 2005-10-06
MY166037A (en) 2018-05-21
EA008602B1 (en) 2007-06-29
NL1025805C2 (en) 2005-09-27
CA2553755C (en) 2013-12-03
WO2005092486A1 (en) 2005-10-06
EA200601764A1 (en) 2007-02-27
CN100551511C (en) 2009-10-21
AR049627A1 (en) 2006-08-23
EG26185A (en) 2013-04-07

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