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Method for producing solid urea by granulation

Inactive Publication Date: 2018-07-05
CASALE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a more efficient way to remove water from urea granulation compared to conventional methods, resulting in better quality granules and no added formaldehyde. This affects a limited cost but allows for the production of higher quality urea which is in high demand. The invention also allows for the revamping of existing plants by adding a granulation section and utilizing the existing evaporation section, eliminating the need for additional evaporation and reducing costs.

Problems solved by technology

3-4%), worsens the quality of the product.

Method used

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  • Method for producing solid urea by granulation
  • Method for producing solid urea by granulation

Examples

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Embodiment Construction

[0028]FIG. 1 shows a schematic urea plant comprising a synthesis section US and a recycling section UR. The recycling section UR provides an aqueous solution of urea SOL containing about 70% by weight of urea.

[0029]Said solution passes through evaporation section EV inside which the water is removed, obtaining a urea melt UM containing more than 98%, for example 99.7%, by weight of urea. Said urea melt UM, without the addition of formaldehyde, is fed to a granulation section GS, obtaining granules of urea U.

[0030]FIG. 2 shows an example of revamping of a plant in which the urea melt UM is originally fed to a prilling section PS which produces urea prills P. At least a part UM′ of said urea melt UM is fed to a granulation section GS which is arranged parallel to the prilling section PS, also in this case without the addition of formaldehyde.

[0031]In some embodiments, the UM stream is directed entirely towards the new granulation section GS, i.e. the production of prills P is disconti...

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Abstract

Method for producing solid urea by granulation, wherein the granulation is fed with liquid urea having a purity greater than 98% by weight and not containing formaldehyde.

Description

FIELD OF APPLICATION[0001]The invention relates to the field of the production of solid urea.PRIOR ART[0002]Solid urea is produced mainly by prilling or granulation.[0003]Prilling involves cooling droplets of liquid urea falling inside a tower by means of counter-flowing air. The solids thus formed are termed prills. Granulation involves spraying liquid urea onto granules inside a proper granulator, for example in a fluid bed; the liquid forms a layer which solidifies, thus increasing the size of the granule. Both techniques are known to persons skilled in the art and are described in the literature, for example in Meessen, “Urea”, Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH Verlag, 2010.[0004]Granulation offers a series of recognized advantages and is considered to be superior to prilling. It is well-known that the prills have a certain fragility essentially due to the rapid cooling of the droplets which creates a porous structure. The solid product obtained by granul...

Claims

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Application Information

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IPC IPC(8): B01J2/16C05C9/00
CPCB01J2/16C05C9/005B01J2/00C05C9/00C07C273/14C07C273/16
Inventor BEDETTI, GIANFRANCO
Owner CASALE SA
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