Casale Sa

Urea Casale Sa

Casale Chemicals Sa

Ammonia Casale Sa

Gianfranco Bedetti

Ermanno Filippi

Luca Zanichelli

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.

Method for producing solid urea by granulation

A process for production of a granular urea product in a fluidized-bed where: small droplets () of fresh urea melt are contacted with a cooling medium to form solid particles, said solid particles () are contacted with droplets of urea melt () which are larger than said germ particles, the solid particles and said droplets forming together larger solid particles (), and said solid particles further increasing their size step by step and upon contact with droplets of urea melt, until the solid particles reaches a given size, and said solid particles are then subject to a further growing process by contact with liquid droplets now smaller than the solid particles, until a desired size of the granular product is reached.

Process and apparatus for production of a granular urea product

A process for preparation of a granular urea product by granulating a urea solution in a fluidized bed, where the granulation process takes place along a substantially longitudinal growth path, from a granulation starting end () to a product discharge end () of said fluidized bed, and said urea solution enters the fluidized bed by means of several urea inputs () taken from a main urea feed (), where an additive () is mixed with said urea solution said additive has a non-uniform concentration in said urea inputs, so that at least two of said urea inputs have a different concentration of additive.

Fluid bed granulation of urea and related apparatus

Fluid bed granulation process of an appropriate substance, comprising the cooling in a second fluid bed of the granules obtained. The same flow of fluidification air is used to form and support both fluid beds.

Fluid bed granulation process and apparatus

Fluid bed granulation process comprising the steps of: &#x2014;forming a fluid bed of seeds (S) of a chosen substance, &#x2014;feeding said fluid bed with a continuous fluid flow (L) comprising a growth liquid, &#x2014;inducing and maintaining a continuous vortex (V) in said fluid bed, the vortex (V) having a substantially horizontal axis, characterized in that said fluid flow (L) is fed into predetermined first zones (Z) of said fluid bed, said first zones (Z) being alternated to second zones (Z) of said fluid bed in which said fluid flow (L) is not fed.

Fluid bed granulation process

A method for atomizing a liquid (L) in a spraying nozzle (), wherein a gaseous phase (G) and a liquid (L) are fed to a mixing chamber () inside a nozzle (), obtaining an emulsion of the gas in the liquid, the emulsion being under pressure inside the chamber and formed by gas bubbles enveloped by the liquid in a film state. The speed of the gaseous phase at the inlet of the mixing chamber is around the speed of sound or greater. The atomized liquid is obtained by an expansion of the emulsion at the outlet of the chamber. A suitable nozzle () is also disclosed, comprising a mixing chamber () and a distribution device (D) adapted to provide appropriate gas and liquid feed to form an emulsion.

Spraying method and nozzle for atomization of a liquid

Process and apparatus for granulation of a liquid phase, wherein a polydispersed flow of droplets of said liquid phase is generated, with descending motion in contact with solidification air along a substantially vertical granulation path, and wherein inside said polydispersed flow, small-sized droplets solidify producing solid particles, and said solid particles grow by collision with other droplets of liquid; in some embodiments the product obtained with this new granulation method can be grown with the conventional method.

Method for the granulation of urea

Fluid bed granulation process comprising the step of cooling the granules in a cooling fluid bed (F). At least part of the fluidizing air coming out from said cooling fluid bed (F) is fed into the granulation fluid bed (F).

In order to produce granules granulometrically polidispersed in a very little range, a fluid bed granulation process of the type comprising the steps of preparing a fluid bed of seeds (S) of the substance to be granulated, having a free surface (P) substantially horizontal; and feeding a continuous flow (L) of a fluid comprising a growth liquid, provides in the fluid bed for a continuous vortex (V) with a substantially horizontal axis, in which an upper zone (Z) of seeds wetting and evaporation of possible solvent contained in the flow (L) and a lower zone (Z) of solidification/consolidation of the growth liquid are identified.

Fluid bed granulator

A hydrocarbon partial oxidation process for obtaining gaseous mixtures comprising hydrogen and carbon monoxide is carried out through a burner () comprising a mixing chamber () that has an inner side wall () extending between at least one inlet opening () and an outlet opening (), independent gaseous flows of hydrocarbons and oxygen, respectively, being continuously fed into said mixing chamber () to form a gaseous mixture advancing towards said outlet opening () to be fed into a combustion chamber () of the gaseous mixture itself, into said mixing chamber () and substantially in contact with the inner side wall () thereof, a flow of an inert fluid is also fed in equicurrent to said gaseous mixture, with formation of a respective annular flow of inert fluid, enveloping said gaseous mixture from which it is substantially separated by a respective inner limit layer, said annular flow of inert fluid having, at said limit layer, an advancing speed at least equal to the speed of propagation of the flame in said gaseous mixture.

Process and burner for hydrocarbon partial oxidation

A process for obtaining finished granules of a predetermined substance in a granulation fluid bed (F) of the so-called vertical growth type, the bed being formed and maintained by a respective flow of fluidification air, comprises a transfer phase by falling of the finished granules in a pressurized space below the granulation bed and a recovery phase of the finished granules from the pressurized space.

A nozzle for distributor devices of granule's growth liquid substance in fluid bed granulators, is distinguished by the fact that it comprises a first duct (), with substantially rectilinear axis (A) and with a predetermined diameter, which duct has an end portion () including a supply opening () and made of at least two subsequent segments, a first cone-shaped segment () converging on the axis (A) and a further cone-shaped segment () diverging from the axis (A) and ending in the supply opening (), a second duct () extending co-axially inside the first duct (), with which it forms an annular space (), the second duct () having a supply end () extended inside the first cone-shaped segment () of the first duct ().

Fluid bed granulation apparatus

A process for carrying out secondary reforming reactions for the production of synthesis gas wherein a gas flow comprising oxygen and a gas flow comprising hydrocarbons are fed into a combustion chamber and are reacted upon mixing, thus obtaining a gas flow comprising hydrogen and carbon monoxide fed in turn to a catalytic bed for carrying out a steam reforming reaction, is distinguished in that it comprises the steps of:&#x2014;feeding the gas flow comprising oxygen in the combustion chamber in the form of a plurality of jets not laid the one upon the other with respect to the direction of the flow comprising hydrocarbons and generated by corresponding parallel streamtubes having equal velocity;&#x2014;splitting the plurality of jets within the gas flow comprising hydrocarbons in the combustion chamber so as to mix the gas flow comprising oxygen with amounts of gas flow comprising hydrocarbons at local constant ratio.

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Milan, Italy

Gianfranco Bedetti