Class 564/70 - With decomposition of by-product ammonium carbamate (i.e., decomposition of HNH-COO-HHNHH)

Subclass of Class 564 - Organic compounds -- part of the class 532-570 series
Definition: Processes wherein by-product ammonium carbamate is decomposed.
No. of patents: 73
Last issue date: 01/31/2012

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Number	Title	Issue Date
8106241	Enhanced process for the synthesis of urea An enhanced process is described for the synthesis of urea from ammonia and carbon dioxide, at a high pressure and temperature, with the formation of ammonium carbamate as intermediate, which includes a high pressure synthesis section, comprising at least one separa...	01/31/2012
7608735	Process for urea production and related plant A process for urea production from ammonia and carbon dioxide, in which part of the aqueous solution comprising urea, ammonium carbamate and ammonia obtained in a urea synthesis section is subjected to dissociation in a treatment section operating at a predetermined...	10/27/2009
7238231	Process for manufacturing zirconia-treated titanium dioxide pigments An improved process is described for manufacturing zirconia-treated titanium dioxide pigments, wherein the zirconia treatment is accomplished in the process of fluidizing a titanium dioxide filter or press cake and then drying the same, through the addition to the f...	07/03/2007
7220882	Process for urea production and plant In a process for urea production of the type comprising the reaction between ammonia and carbon dioxide in a high-pressure reactor followed by an autothermal stripping of the resulting reaction mixture so as to obtain a gaseous flow comprising ammonia and carbon dio...	05/22/2007
7094927	Process for increasing the capacity of a urea plant Process for increasing the capacity of a urea plant comprising a compression section, a high-pressure synthesis section, a urea recovery section, in which a urea melt is formed, and optionally a granulation section, the capacity of the urea plant being increased by ...	08/22/2006
7091379	Process and plant for the production of urea A process for urea production comprises the steps of:—performing a reaction between ammonia and carbon dioxide in a reaction space to obtain a reaction mixture comprising urea, carbamate and free ammonia in aqueous solution,—subjecting said mixture to a strippin...	08/15/2006
7052655	Urea synthesis process and apparatus Urea is prepared by reacting ammonia and carbon dioxide in an apparatus comprising a vertical condensation and synthesis column and a stripper, to provide a urea synthesis solution comprising urea, unreacted ammonia, unreacted carbon dioxide and water. The urea synt...	05/30/2006
6921838	Process for the preparation of urea The invention relates to a process for the preparation of urea from ammonia and carbon dioxide with the application of a synthesis reactor, a condenser, a scrubber and a stripper, wherein an outlet of the stripper, through which a gas stream is discharged during ope...	07/26/2005
6881862	Process for the preparation of urea The invention relates to a process for the preparation of urea from ammonia and carbon dioxide, which preparation takes places wholy or partly with the application of a synthesis reactor, a condenser, a scrubber and a stripper, wherein an outlet of the stripper, thr...	04/19/2005
6875892	Method for the production of urea A method for the production of synthesis urea from liquid ammonia and gaseous carbon dioxide, comprising the step of feeding separate flows (6, 8) of liquid ammonia and gaseous carbon dioxide in continuous to a substantially vertical or horizontal column synt...	04/05/2005
6855846	Process for the preparation of urea Process for the preparation of urea from ammonia and carbon dioxide in which all or part of the liquid ammonia needed for the process is supplied to the high-pressure scrubber in such a way that it is in direct contact with the other streams supplied to this scrubbe...	02/15/2005
6852886	Process for the preparation of urea Process for the preparation of urea from ammonia and carbon dioxide in which a urea synthesis solution containing urea, ammonium carbamate and unconverted ammonia is formed in a synthesis zone, a part of the urea synthesis solution being transferred from the synthes...	02/08/2005
6730811	Process for the preparation of urea The invention relates to a process for the preparation of urea from ammonia and carbon dioxide in which the low-pressure carbamate stream formed in the further upgrading of the urea synthesis solution is stripped in a CO2-carbamate stripper in countercurr...	05/04/2004
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
6696026	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...	02/24/2004
6680407	Installation and process for the preparation of urea The invention relates to an installation for the preparation of urea from ammonia and carbon dioxide, the installation comprising two reactor sections in a vertically placed combined reactor and a high-pressure condenser section. The installation may comp...	01/20/2004
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
6538157	Method for the preparation of urea A method for the preparation of urea in a reactor using ammonia and carbon dioxide as starting materials, includes a) bringing the ammonia and carbon dioxide into contact in the reactor under conditions for the formation of carbamate; and b) decomposing t...	03/25/2003
6518457	Urea synthesis process A process for the synthesis of urea, which comprises subjecting a urea synthesis solution from a urea synthesis column to stripping with a raw material carbon dioxide under a pressure approximately equal to the urea synthesis pressure to separate a major ...	02/11/2003
6476262	Urea synthesis process and apparatus Urea is prepared by reacting ammonia and carbon dioxide in an apparatus comprising a vertical condensation and synthesis column and a stripper, to provide a urea synthesis solution comprising urea, unreacted ammonia, unreacted carbon dioxide and water. Th...	11/05/2002
6448441	Gasification process for ammonia/urea production The present invention involves a process for the co-production of ammonia and urea in which two parallel gasifiers are utilized so as to optimize the H2 /CO2 ratio in the combined syngas product, thereby maximizing the ammonia and ur...	09/10/2002
6426434	Process for the synthesis of urea A urea synthesis process with improved heat economy, wherein a urea synthesis solution obtained by removing most of the unreacted ammonium carbamate by stripping with carbon dioxide at a pressure approximately equal to a urea synthesis pressure is subject...	07/30/2002
6392096	Process for the preparation of urea The invention relates to a process for the preparation of urea from ammonia and carbon dioxide, the preparation being effected in whole or in part in a vertical combi-reactor. The gas stream leaving the stripper is fed to the condenser section of a vertic...	05/21/2002
6344588	Process for the preparation of urea In the present process for the preparation of urea, an off-gas stream released during the synthesis of melamine in a high-pressure melamine process which consists predominantly of ammonia and carbon dioxide, is introduced into at least one high-pressure s...	02/05/2002
6342632	Process and plant for the production of urea with high conversion yield and low energy consumption In a process for the production of urea, substantially pure ammonia and carbon dioxide are reacted in a reaction space (1) from which comes out a reaction mixture subjected to stripping (2) to obtain a partially purified mixture sent to a urea recovery se...	01/29/2002
6340451	Method for the simultaneous modernization of a plant for ammonia production and a plant for urea production A method for the simultaneous modernization of a plant for ammonia synthesis and a plant for urea synthesis, provides--inter alia--the arrangement of a carbamate synthesis section and a carbamate decomposition section, in order to obtain a predetermined a...	01/22/2002
6287525	Process and plant for urea production with reaction spaces having differentiated yields In a process for urea production, substantially pure ammonia and carbon dioxide are reacted in a main reaction space from which outgoes a reaction mixture subjected to stripping to obtain a partially purified mixture sent to a urea recovery section. From ...	09/11/2001
6284922	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...	09/04/2001
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
6118023	Method for increasing the capacity of an existing urea process Method for increasing the capacity of an existing urea process, the existing urea process comprising a reactor (R), a pressure-reduction section (SC) and a urea-recovery section (U), characterized in that (i) a stripping column (S) is added, in which ammonium ...	09/12/2000
6114579	Process for the preparation of urea In the present process for the preparation of urea, an off-gas stream released during the synthesis of melamine in a high-pressure melamine process which consists predominantly of ammonia and carbon dioxide, is introduced into at least one high-pressure s...	09/05/2000
6093850	Process for the synthesis of urea and equipment therefor The present invention provides an improved process for synthesizing urea from ammonia and carbon dioxide while preventing corrosion of sites, that are to be in contact with a condensate, of the joints of a tube plate and cooling tubes in a condenser insta...	07/25/2000
5936122	Urea synthesis process and apparatus therefor A vertical condenser is installed on or above a urea synthesis column to condense the mixed gas from the stripper by bringing it into contact with an absorption medium under cooling. A first down pipe for making the top part of the condenser communicate w...	08/10/1999
5886222	High yield process for urea synthesis Improved yield process for urea synthesis by starting from ammonia and carbon dioxide, comprising a reaction zone under high pressure and temperature conditions, a section wherein a portion of unreacted ammonia and carbon dioxide are stripped and recycled...	03/23/1999
5849952	Urea production process with high energy efficiency A urea production process with high energy efficiency, in which the urea solution obtained from the synthesis stage is subjected to a first stage of high pressure thermal decomposition of the ammonium carbamate which has not undergone conversion to urea t...	12/15/1998
5847208	Method 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 ...	12/08/1998
5767313	Method for the preparation of urea The present invention relates to a process and apparatus for the preparation of urea, and in particular for urea obtained from ammonium carbamate formulated from carbon dioxide and ammonia at a pressure of about 125 bar to about 350 bar in a urea synthesi...	06/16/1998
5763660	High yield process for urea synthesis Improved yield process for urea synthesis by starting from ammonia and carbon dioxide, comprising a reaction zone under high pressure and temperature conditions, a section wherein a portion of unreacted ammonia and carbon dioxide are stripped and recycled...	06/09/1998

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Class 564/70 - With decomposition of by-product ammonium carbamate (i.e., decomposition of HNH-COO-HHNHH)