Assignee: Urea Casale S.A.

Location: Lugano-Besso, CH
No. of patents: 26

Number	Title	Issue Date
6926869	Apparatus for carbamate decomposition and ammonia and carbon dioxide stripping from urea solutions capable of 180 degree inversion about a horizontal axis An apparatus (1) for carbamate decomposition and ammonia and carbon dioxide stripping from urea solutions, wherein a stripper (2) including a substantially cylindrical shell (3), which can be fitted onto a structure (6) for supporting the...	08/09/2005
6827887	Method for obtaining urea prills A method for obtaining urea prills in a prilling tower (1) comprising the step of making a plurality of melt urea droplets to fall from a urea melt distributing device (4) towards an urea prills collecting bottom (6) of the prilling tower, furth...	12/07/2004
6702992	Method for modernizing a urea production plant A method for the modernization of a plant for urea production of the type comprising a reactor (2) for urea synthesis, a stripping unit (3) with carbon dioxide and at least one vertical condensation unit (4) of the film type, foresees the provision of mea...	03/09/2004
6649795	Process for decomposing a carbamate aqueous solution coming from the urea recovery section of a urea production plant In a process for decomposing a carbamate aqueous solution coming from a urea recovery section of a urea production plant at a predetermined temperature by indirect heat exchange with a heating fluid having a different predetermined temperature, the temper...	11/18/2003
6552224	Process and plant for the production of urea A process for urea production in a synthesis loop based on CO2 stripping is distinguished by the fact that at least part of a flow recycle carbamate is sent to a treatment of carbamate decomposition and removal of free ammonia to obtain a vapou...	04/22/2003
6444180	Reactor for two-phase reactions, in particular for urea synthesis at high pressure and temperature A reactor for two-phase reaction, in particular for urea synthesis at high pressure and temperature of the type wherein a co-current flow of a gaseous phase and a liquid phase takes place, comprises a substantially cylindrical vertical external shell (2) ...	09/03/2002
6390388	Method and device for the controlled break-up of liquid jets A method for the controlled break-up of liquid jets for production of substantially monodispersed drops stands out for the fact that it comprises the steps of: feeding a plurality of first liquid jets (4) having stationary motion to a plurality of mutuall...	05/21/2002
6334984	Hydrolysis reactor for removal of urea, ammonia and carbon dioxide from a liquid phase comprising urea in aqueous solution A hydrolysis reactor for removal of urea, ammonia and carbon dioxide from a liquid phase comprising urea in aqueous solution advantageously comprises a dividing baffle extending horizontally at a preset height in the reactor in which it defines a first an...	01/01/2002
6231827	Process for combined production of ammonia and urea A process for the combined production of ammonia and urea of the type comprising an ammonia synthesis reactor (2), a urea synthesis reactor (5) and a urea recovery section (21) stands out for the fact of submitting at least a part of a flow comprising car...	05/15/2001
6150555	Process for urea production An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high yield reaction space fed by highly pure reagents (NH3 and CO2) and a s...	11/21/2000
6120740	Reactor for two-phase reactions, in particular for urea synthesis at high pressure and temperature A reactor for two-phase reaction, in particular for urea synthesis at high pressure and temperature of the type wherein a co-current flow of a gaseous phase and a liquid phase takes place, comprises a substantially cylindrical vertical external shell (2) ...	09/19/2000
6084129	Process for reducing the residual free ammonia emissions from an urea production plant A process for reducing the residual free ammonia emissions from an urea production plant comprises the step of feeding a gas flow comprising carbon dioxide (8) to a melt urea flow (3) coming from the concentration section (13) of the plant....	07/04/2000
6062487	Method and device for the controlled break-up of liquid jets A method for the controlled break-up of liquid jets for production of substantially monodispersed drops stands out for the fact that it comprises the steps of feeding a plurality of first liquid jets having steady motion to a plurality of mutually indepen...	05/16/2000
5888460	Reactor for two-phase reactions, in particular for urea synthesis at high pressure and temperature An in-situ modernization method is provided for a reactor of the type having a plurality of spaced apart perforated plates disposed within a hollow cylindrical vessel wherein the plates are perforated and spaced from the vessel wall to define an annular g...	03/30/1999
5750080	Method for in-situ modernization of a urea synthesis reactor A method for in-situ modernization of a reactor for urea synthesis at high pressure and temperature of the type wherein a co-current flow of a gaseous phase and a liquid phase takes place, comprising a vertical tubular shell (2) in which is supported a pl...	05/12/1998
5684194	Process for urea production involving a carbon dioxide stripping step An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high-yield reactor with partial removal of the reaction heat and a urea rec...	11/04/1997
5681537	Plant for urea production involving a carbon dioxide stripping step An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high-yield reactor with partial removal of the reaction heat and a urea rec...	10/28/1997
5580236	Plant for urea production A process is described for the industrial synthesis of urea, making the ammonia (NH3) and the carbon dioxide (CO2) react, in at least one reaction space, at high pressures and temperatures and recycling at least in part the unreacted products obtained in ...	12/03/1996
5573735	Method of retrofitting urea production plant A process is described for the industrial synthesis of urea, making the ammonia (NH3) and the carbon dioxide (CO2) react, in at least on reaction space, at high pressures and temperatures and recycling at least in part the unreacted products obtained in a...	11/12/1996
5573734	Plant for the production of urea in reaction spaces with different yields In a process of producing urea in which ammonia and carbon dioxide are reacted in a first reaction space (E-1, R-1) the unreacted carbamate present in the reaction mixture is subjected to a thermal decomposition treatment, so as to obtain ammonia and carb...	11/12/1996
5523482	Process and plant for the production of urea in reaction spaces with different yields In a process of producing urea in which ammonia and carbon dioxide are reacted in a first reaction space (E-1, R-1) the unreacted carbamate present in the reaction mixture is subjected to a thermal decomposition treatment, so as to obtain ammonia and carb...	06/04/1996
5403956	Process for urea production A process is described for the industrial synthesis of urea, making the ammonia (NH3) and the carbon dioxide (CO2) react, in at least one reaction space, at high pressures and temperatures and recycling at least in part the unreacted products obtained in ...	04/04/1995
5399755	Process and equipment for the hydrolysis of residual urea in the water from synthesis plants Process for the hydrolysis of urea contained in the process water from plants for the synthesis of urea consisting of the thermic treatment of the water containing urea and of the removal by stripping of the compounds from decomposition of the urea (CO	03/21/1995
5380943	Process and plant for the production of urea with differentiated yield reaction spaces Process for the industrial synthesis of urea, by reacting ammonia (NH3) and carbon dioxide (CO2) in at least one reaction space, at high pressures and temperatures and by recirculating at least part of the non-reacted products obtain...	01/10/1995
5306355	System for the passivation of metal surfaces affected by operating conditions and agents promoting corrosion A system for the passivation of metal surfaces, and more especially those of stainless steel, titanium, etc., in equipment used for chemical processes, where elements and compounds are formed which have a corrosive action, in particular where temperature ...	04/26/1994
5304353	Apparatus for increasing the yield and the production potential of urea reactors Urea is formed by the synthesis of ammonia with carbon dioxide at high pressure and temperature in an internal space of reactors through which flow a liquid phase cocurrently with a gas phase. The reactors are divided into compartments to avoid excessive ...	04/19/1994

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Assignee: Urea Casale S.A.