WO2005092486A1 - Urea granulation process - Google Patents

Urea granulation process Download PDF

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Publication number
WO2005092486A1
WO2005092486A1 PCT/NL2005/000136 NL2005000136W WO2005092486A1 WO 2005092486 A1 WO2005092486 A1 WO 2005092486A1 NL 2005000136 W NL2005000136 W NL 2005000136W WO 2005092486 A1 WO2005092486 A1 WO 2005092486A1
Authority
WO
WIPO (PCT)
Prior art keywords
urea
granulation
granulator
granule
additive
Prior art date
Application number
PCT/NL2005/000136
Other languages
French (fr)
Inventor
Jozef Hubert Meessen
Original Assignee
Dsm Ip Assets B.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dsm Ip Assets B.V. filed Critical Dsm Ip Assets B.V.
Priority to CA2553755A priority Critical patent/CA2553755C/en
Priority to EA200601764A priority patent/EA008602B1/en
Publication of WO2005092486A1 publication Critical patent/WO2005092486A1/en
Priority to EGPCTNA2006000915A priority patent/EG26185A/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

Definitions

  • the invention relates to a 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.
  • urea granulation processes are described in the Encyclopedia of Chemical Technology, third edition, volume 23, pages 566-572. It discusses among other things the Cominco granulation process, the TVA falling-curtain granulation process, the NSM granulation process and the MitsuiToatsu-Toyo Engineering granulation process, wherein granulation is effected in the manner described above.
  • the Cominco granulation process and the TVA falling-curtain granulation process employ as a granulator a drum that rotates about its longitudinal axis and so transports nuclei that are supplied at the beginning of the granulator through the granulator, with sprayers being present over a large part of the length of the drum for spraying urea melt.
  • the nuclei are introduced in a fluid bed and transported in the fluid bed, with the nuclei growing to form granules on account of urea melt being sprayed in the fluid bed by sprayers that are positioned along a large part of the length of the fluid bed.
  • the object of the invention is to reduce the quantity of granulation additive relative to the urea melt, with urea granulate with comparable properties being obtained.
  • the invention is characterized in that the granulation additive is at least partially supplied to the last section of the granulator. In this way, less granulation additive is needed for obtaining urea granulate with good properties.
  • a granulator for granulating urea comprises a casing to one side of which nuclei are supplied. Furthermore, the granulator comprises means of transporting the granules that develop from the nuclei to the opposite side. In a drum granulator such transport takes place through rotation of the drum granulator and displacement of the granules by the blades present therein. In a fluid bed granulator the fluid bed is located above a distribution plate. The fluid bed is maintained by the fluidization air supplied through the distribution plate. In a fluid bed granulator the transport of granules through the granulator is controlled by the supply direction of the fluidization air through the distribution plate.
  • the urea melt is supplied to the granulator perpendicularly to the transport direction of the nuclei and the urea granulate through the granulator.
  • Perpendicular here and hereinafter means at an angle of 70-110° to the transport direction of the nuclei and the urea granulate.
  • the urea melt is supplied to the granulator through sprayers or distributors that are located over almost the full length of the granulator.
  • the granulation additive is now at least partially supplied to the last section of the granulator, that is, the section where the last sprayers or urea melt distributors are present.
  • a portion of the granulation additive may be supplied in a preceding section of the granulator by for example mixing a proportion of the granulation additive with the urea melt before it is added to the granulator.
  • Addition of the granulation additive at least partially to the last granulator section means that at least 50% of the granulation additive is added here.
  • Preferably at least 70% of the granulation additive is supplied to the last granulator section.
  • the granulation additive may be supplied separately from the urea melt but is preferably mixed with the urea melt before it is supplied to the last granulator section.
  • the granulator typically contains a zone to which urea melt is not supplied.
  • the granulate is cooled in this zone.
  • granulation additives are formaldehyde, methylolurea, formurea, hexamethylene tetramine.
  • Formaldehyde is preferably used as granulation additive for improving the mechanical strength of the urea granules and for reducing the tendency of the urea granules to adhere together during storage (caking behaviour).
  • Formaldehyde may be added as gaseous formaldehyde, formalin, paraformaldehyde, a solution of paraformaldehyde or as urea formaldehyde precondensate.
  • Formaldehyde is most often added as formaldehyde precondensate.
  • Formaldehyde precondensate contains for example 60 wt.% formaldehyde.
  • 0.01-0.4 wt.% formaldehyde is added to the urea melt relative to the urea added.
  • the invention also relates to a urea granule containing a granulation additive.
  • the granulation additive is added over the full length of the granulator, as a result of which the concentration of the granulation additive is the same throughout the urea granule.
  • State of the art processes are known whereby the granulation additive is distributed over the surface of the urea granule after the formation of a urea granule, so in essence after the granulation process is completed.
  • the granulation additive is present on the urea granule's surface only.
  • the process according to the invention ensures that the granulation additive is present in the granule such that the concentration of the granulation additive is highest in the outer layer of the granule.
  • the granulation additive is not only present on the surface of the granule, but is solidified together with the urea melt in the outer layer of the granule.
  • Granulation additive may also be present in the rest of the granule.
  • the granulation additive is present in the granule such that its concentration increases from the core to the outside surface of the granule.
  • the granules according to the invention preferably contain 0,01-0,4 wt.% formaldehyde relative to urea.
  • Figure 1 urea granulation process according to the invention is represented.
  • Figure 1 shows a granulator wherein sprayers (S) are present over almost the full length for adding the urea melt originating from a urea plant or a urea melt storage tank (U).
  • Nuclei (N) are supplied to the granulator above a distribution plate.
  • Fluidization air and secondary air (A) are supplied beneath the distribution plate and to the sprayers, respectively.
  • the granulation additive (D) is completely added to the urea melt supply line connecting to the last sprayer.
  • a formaldehyde-containing solution (UFC 85 ® ) was added to the urea melt directly after the evaporators in the urea plant (U).
  • the amount of the formaldehyde-containing solution added was such that the urea granules obtained after granulation, contained 0.4 wt% of formaldehyde relative to urea.
  • Urea granules were obtained wherein formaldehyde was evenly distributed.
  • the crushing strength of the granule was determined using an apparatus of Lloyds instruments; type LRX + and has a value of 4.8 kgf determined on a granule with a diameter of 2.85 mm. Almost no dust formation occurred during transport and handling of the granules.
  • Urea granules were obtained wherein the concentration of formaldehyde in the outer layer of the granule was about 30% higher than the concentration in the middle of the granule.

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 invention relates to a 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. Such urea granulation processes are described in the Encyclopedia of Chemical Technology, third edition, volume 23, pages 566-572. It discusses among other things the Cominco granulation process, the TVA falling-curtain granulation process, the NSM granulation process and the MitsuiToatsu-Toyo Engineering granulation process, wherein granulation is effected in the manner described above. The Cominco granulation process and the TVA falling-curtain granulation process employ as a granulator a drum that rotates about its longitudinal axis and so transports nuclei that are supplied at the beginning of the granulator through the granulator, with sprayers being present over a large part of the length of the drum for spraying urea melt. In the NSM granulation process and the MitsuiToatsu- Toyo Engineering granulation process the nuclei are introduced in a fluid bed and transported in the fluid bed, with the nuclei growing to form granules on account of urea melt being sprayed in the fluid bed by sprayers that are positioned along a large part of the length of the fluid bed. It is known that in these granulation processes formaldehyde or another granulation additive may be added to the urea melt before it is supplied to the granulator so as to improve granulation and to enhance the properties of the urea granules. A drawback of the known process is that comparatively much granulation additive relative to the urea melt needs to be added in order to achieve the desired improvements. The object of the invention is to reduce the quantity of granulation additive relative to the urea melt, with urea granulate with comparable properties being obtained. The invention is characterized in that the granulation additive is at least partially supplied to the last section of the granulator. In this way, less granulation additive is needed for obtaining urea granulate with good properties. This is advantageous since granulation additives are costly and their addition heavily affects the cost price of urea granulate. A granulator for granulating urea comprises a casing to one side of which nuclei are supplied. Furthermore, the granulator comprises means of transporting the granules that develop from the nuclei to the opposite side. In a drum granulator such transport takes place through rotation of the drum granulator and displacement of the granules by the blades present therein. In a fluid bed granulator the fluid bed is located above a distribution plate. The fluid bed is maintained by the fluidization air supplied through the distribution plate. In a fluid bed granulator the transport of granules through the granulator is controlled by the supply direction of the fluidization air through the distribution plate.
The urea melt is supplied to the granulator perpendicularly to the transport direction of the nuclei and the urea granulate through the granulator. Perpendicular here and hereinafter means at an angle of 70-110° to the transport direction of the nuclei and the urea granulate. The urea melt is supplied to the granulator through sprayers or distributors that are located over almost the full length of the granulator. According to the process of the invention the granulation additive is now at least partially supplied to the last section of the granulator, that is, the section where the last sprayers or urea melt distributors are present. Besides the supply of the granulation additive to the last section of the granulator, a portion of the granulation additive may be supplied in a preceding section of the granulator by for example mixing a proportion of the granulation additive with the urea melt before it is added to the granulator. Addition of the granulation additive at least partially to the last granulator section means that at least 50% of the granulation additive is added here. Preferably at least 70% of the granulation additive is supplied to the last granulator section. The granulation additive may be supplied separately from the urea melt but is preferably mixed with the urea melt before it is supplied to the last granulator section. Following the last granulator section, prior to the granulate leaving the granulator, the granulator typically contains a zone to which urea melt is not supplied. The granulate is cooled in this zone. Examples of granulation additives are formaldehyde, methylolurea, formurea, hexamethylene tetramine. Formaldehyde is preferably used as granulation additive for improving the mechanical strength of the urea granules and for reducing the tendency of the urea granules to adhere together during storage (caking behaviour). Formaldehyde may be added as gaseous formaldehyde, formalin, paraformaldehyde, a solution of paraformaldehyde or as urea formaldehyde precondensate. Formaldehyde is most often added as formaldehyde precondensate. Formaldehyde precondensate contains for example 60 wt.% formaldehyde. Preferably 0.01-0.4 wt.% formaldehyde is added to the urea melt relative to the urea added. The invention also relates to a urea granule containing a granulation additive. In the processes described in the aforementioned Encyclopedia of Chemical Technology, third edition, volume 23, pages 566-572, the granulation additive is added over the full length of the granulator, as a result of which the concentration of the granulation additive is the same throughout the urea granule. State of the art processes are known whereby the granulation additive is distributed over the surface of the urea granule after the formation of a urea granule, so in essence after the granulation process is completed. Thus, following such a process the granulation additive is present on the urea granule's surface only. The process according to the invention ensures that the granulation additive is present in the granule such that the concentration of the granulation additive is highest in the outer layer of the granule. The granulation additive is not only present on the surface of the granule, but is solidified together with the urea melt in the outer layer of the granule. Granulation additive may also be present in the rest of the granule. Preferably, the granulation additive is present in the granule such that its concentration increases from the core to the outside surface of the granule. The granules according to the invention preferably contain 0,01-0,4 wt.% formaldehyde relative to urea. In Figure 1 urea granulation process according to the invention is represented. Figure 1 shows a granulator wherein sprayers (S) are present over almost the full length for adding the urea melt originating from a urea plant or a urea melt storage tank (U). Nuclei (N) are supplied to the granulator above a distribution plate. Fluidization air and secondary air (A) are supplied beneath the distribution plate and to the sprayers, respectively. At the end of the granulator the granules (G) are discharged. The granulation additive (D) is completely added to the urea melt supply line connecting to the last sprayer. Comparative Experiment A
In a urea granulation process according to figure 1 a formaldehyde-containing solution (UFC 85®) was added to the urea melt directly after the evaporators in the urea plant (U). The amount of the formaldehyde-containing solution added, was such that the urea granules obtained after granulation, contained 0.4 wt% of formaldehyde relative to urea. Urea granules were obtained wherein formaldehyde was evenly distributed. The crushing strength of the granule was determined using an apparatus of Lloyds instruments; type LRX + and has a value of 4.8 kgf determined on a granule with a diameter of 2.85 mm. Almost no dust formation occurred during transport and handling of the granules.
Example I
In a urea granulation process according to figure 1 a formaldehyde-containing solution
(UFC 85®) was partially added to the urea melt directly after the evaporators in the urea plant (U) and partially to the urea melt at place D according to the figure. The ratio of the amount of the formaldehyde-containing solution added directly after the evaporators and the amount added to place D was 1:2.5. The total amount of the formaldehyde-containing solution that was added was such that the urea granules obtained after granulation, contained 0.2 wt% of formaldehyde relative to urea. Urea granules were obtained wherein the concentration of formaldehyde in the outer layer of the granule was about 30% higher than the concentration in the middle of the granule.
The crushing strength of the granule was determined as described for Comparative
Experiment A and had a value of 4.8 kgf. Almost no dust formation occurred during transport and handling. With respect to dust formation the product was comparable with the product according to Comparative
Experiment A.

Claims

1. 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 characterized in that the granulation additive is at least partially supplied to the last section of the granulator.
2. Process according to Claim 1 , characterized in that at least 70 wt.% of the granulation additive is supplied to the last granulator section.
3. Process according to Claim 1 or 2, characterized in that the granulation additive is mixed with the urea melt before it is supplied to the last granulator section.
4. Process according to any one of Claims 1-3, characterized in that the granulation additive is formaldehyde.
5. Process according to any one of Claims 1-4, characterized in that 0.01-0.4 wt.% formaldehyde is added to the urea melt relative to urea.
6. Urea granule containing a granulation additive, characterized in that the concentration of the granulation additive is highest in the outer layer of the granule.
7. Urea granule according to Claim 6, characterized in that the granulation additive is present in the whole granule such that the concentration of the granulation additive increases from the core to the outside surface.
8. Urea granule according to Claim 6 or 7, characterized in that the granulation additive is formaldehyde.
9. Urea granule according to any one of claims 6-8, characterized in that the granule contains 0,01-0,4 wt.% formaldehyde relative to urea.
PCT/NL2005/000136 2004-03-25 2005-02-24 Urea granulation process WO2005092486A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2553755A CA2553755C (en) 2004-03-25 2005-02-24 Urea granulation process
EA200601764A EA008602B1 (en) 2004-03-25 2005-02-24 Urea granulation process
EGPCTNA2006000915A EG26185A (en) 2004-03-25 2006-09-24 Urea granulation process

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 (1)

Publication Number Publication Date
WO2005092486A1 true WO2005092486A1 (en) 2005-10-06

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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)

Cited By (4)

* 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
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

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Publication number Priority date Publication date Assignee Title
US3290371A (en) * 1959-09-14 1966-12-06 Ici Ltd Process for rendering urea anti-caking
GB1296937A (en) * 1970-03-16 1972-11-22
GB1304587A (en) * 1969-03-29 1973-01-24
FR2393779A1 (en) * 1977-06-09 1979-01-05 Azote Sa Cie Neerlandaise Urea granules prodn. - by spraying fluidised urea particles with conc. urea soln.
JPH09169717A (en) * 1995-12-19 1997-06-30 Toyo Eng Corp Production of large granule urea
US5653781A (en) * 1992-08-07 1997-08-05 Hydro Agri Sluiskil B.V. Process for the production of urea granules
US5965071A (en) * 1996-02-01 1999-10-12 Toyo Engineering Corporation Process for preparing granular urea

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Publication number Priority date Publication date Assignee Title
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

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
US3290371A (en) * 1959-09-14 1966-12-06 Ici Ltd Process for rendering urea anti-caking
GB1304587A (en) * 1969-03-29 1973-01-24
GB1296937A (en) * 1970-03-16 1972-11-22
FR2393779A1 (en) * 1977-06-09 1979-01-05 Azote Sa Cie Neerlandaise Urea granules prodn. - by spraying fluidised urea particles with conc. urea soln.
US5653781A (en) * 1992-08-07 1997-08-05 Hydro Agri Sluiskil B.V. Process for the production of urea granules
JPH09169717A (en) * 1995-12-19 1997-06-30 Toyo Eng Corp Production of large granule urea
US5965071A (en) * 1996-02-01 1999-10-12 Toyo Engineering Corporation Process for preparing granular urea

Non-Patent Citations (1)

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Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 10 31 October 1997 (1997-10-31) *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103189335B (en) * 2010-09-15 2015-09-16 伍德肥料技术有限责任公司 For the production of the method with the urea fertilizer that low moisture absorption tends to
WO2012034650A1 (en) * 2010-09-15 2012-03-22 Uhde Fertilizer Technology B.V. Method for producing urea fertilizer with low moisture absorption tendencies
EA024281B1 (en) * 2010-09-15 2016-09-30 Уде Фертилайзе Текнолоджи Б.В. Method for producing urea fertilizer with low moisture absorption tendencies
EP2431346A1 (en) * 2010-09-15 2012-03-21 Uhde Fertilizer Technology B.V. Method for producing urea fertilizer with low moisture absorption tendencies
CN103189335A (en) * 2010-09-15 2013-07-03 伍德肥料技术有限责任公司 Method for producing urea fertilizer with low moisture absorption tendencies
US8945271B2 (en) 2010-09-15 2015-02-03 Uhde Fertilizer Technology B.V. Method for producing urea fertilizer with low moisture absorption tendencies
RU2595696C2 (en) * 2011-02-21 2016-08-27 Касале Са Urea granulation in fluidised bed and corresponding apparatus
EP2678097B1 (en) 2011-02-21 2016-03-02 Casale Sa Fluid bed granulation of urea and related apparatus
WO2012113473A1 (en) * 2011-02-21 2012-08-30 Urea Casale Sa Fluid bed granulation of urea and related apparatus
EP2489429A1 (en) * 2011-02-21 2012-08-22 Urea Casale S.A. Fluid bed granulation of urea and related apparatus
US9884811B2 (en) 2011-02-21 2018-02-06 Casale Sa 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
WO2016184615A1 (en) * 2015-05-21 2016-11-24 Casale Sa Process for the production of combined fertilizers
US10703686B2 (en) 2015-05-21 2020-07-07 Casale Sa Process for the production of combined fertilizers
EP3594194A1 (en) 2018-07-12 2020-01-15 Casale Sa Urea granulation process
WO2020011562A1 (en) 2018-07-12 2020-01-16 Casale Sa Urea granulation process

Also Published As

Publication number Publication date
CA2553755A1 (en) 2005-10-06
MY166037A (en) 2018-05-21
CN1933900A (en) 2007-03-21
EA200601764A1 (en) 2007-02-27
CA2553755C (en) 2013-12-03
AR049627A1 (en) 2006-08-23
EA008602B1 (en) 2007-06-29
CN100551511C (en) 2009-10-21
EG26185A (en) 2013-04-07
NL1025805C2 (en) 2005-09-27

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