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| Number | Title | Issue Date |
| 8158823 | Method for the modernization of a urea production plant A method for revamping a conventional self-stripping urea plant is disclosed, where a minor portion (18a) of the carbon dioxide feed is fed to the stripper (7) and used as a stripping agent. In further embodiments, another carbamate condenser is... | 04/17/2012 |
| 8158824 | Process for the production of urea from ammonia and carbon dioxide Process for the production of urea from ammonia and carbon dioxide in a urea plant containing a high-pressure synthesis section comprising two reactor sections, a stripper and a condenser, and a recovery section, wherein in the first reactor section a first synthesi... | 04/17/2012 |
| 8129565 | High-pressure loop in a process for synthesis of urea A process and a related plant layout for producing urea are disclosed, wherein the high-pressure loop (1) comprises a synthesis reactor (2), a thermal stripper (3), a condenser (4), and an adiabatic CO2 stripper (10) dis... | 03/06/2012 |
| 8063246 | Method for purifying flue gases from combustion plants and then producing urea A method and apparatus is provided for cleaning flue gases from combustion plants. The method includes removing dust and removing nitrogen from flue gases, bringing flue gases into contact with an aqueous ammonia solution in the presence of an oxidizing agent whereb... | 11/22/2011 |
| 7982068 | 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... | 07/19/2011 |
| 7674933 | Method for modernizing a urea production plant A method for modernizing a urea production plant including a urea synthesis reactor, a stripping unit and at least one condensation unit. The method includes providing: means in the condensation unit for substantially condensing at least a portion of a flow comprisi... | 03/09/2010 |
| 7622609 | Process for the preparation of urea The invention relates to a process for the preparation of urea from ammonia and carbon dioxide in a urea plant that contains a high-pressure synthesis section and one or more recovery section(s) at a lower pressure, the high-pressure synthesis section comprising a r... | 11/24/2009 |
| 7498464 | Method and apparatus for synthesizing urea In a process and an apparatus for synthesizing urea which synthesize urea from ammonia and carbon dioxide, the operating condition can be grasped easily and with good accuracy. A process for synthesizing urea which includes: a reaction step of obtaining a urea synth... | 03/03/2009 |
| 7279599 | Carbamate condensation method and unit for carrying out such a method Method for carbamate condensation of a carbon dioxide/ammonia gaseous phase in a liquid phase in a condensation unit of the so-called submerged type comprising a heat exchange tube bundle having a predetermined number of tubes intended for carbamate condensation, wh... | 10/09/2007 |
| 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 |
| 7074958 | Integrated process for urea/melamine production and related plant An integrated process for urea/melamine production. In the process, urea is synthesized from ammonia and carbon dioxide, obtaining molten urea and a gaseous mixture comprising steam and ammonia. The gaseous mixture is condensed, obtaining a cold aqueous ammoniacal s... | 07/11/2006 |
| 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 |
| 6858755 | Process for the preparation of urea Process for the preparation of urea from ammonia and carbon dioxide, wherein the waste gases released at virtually atmospheric pressure in a urea plant are compressed by an ejector driven by the waste gas from the high-pressure synthesis and are supplied to a medium... | 02/22/2005 |
| 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 |
| 6723876 | Process for the integrated preparation of ammonia and urea Process for the combined preparation of urea and ammonia reactant by steps of providing ammonia synthesis gas containing carbon dioxide and conversion of the synthesis gas to the ammonia reactant, reacting the ammonia reactant with the carbon dioxide in the synthesi... | 04/20/2004 |
| 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 |
| 6632967 | Process for the preparation of urea Process for the preparation of urea from ammonia and carbon dioxide in which the composition of the various process streams is measured via an ultrasonic measuring principle and in which the results of these measurements are used for process control. The ... | 10/14/2003 |
| 6586629 | Method of introducing melamine off-gases into a urea plant The invention relates to a method for producing urea. According to said method, the off-gases which originate from a melamine plant and essentially consist of NH3 and CO2 are introduced into the high-pressure zone of the urea plant b... | 07/01/2003 |
| 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 |
| 6409995 | Use of amino-substituted hydroxybenzophenones as photostable UV filters in cosmetic and pharmaceutical preparations Use of amino-substituted hydroxybenzophenones of the formula I ##STR1## in which the variables have the meanings explained in the description, as photostable UV filters in cosmetic and pharmaceutical preparations for protecting human skin or human hair fr... | 06/25/2002 |
| 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 |
| 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 |
| 6274767 | Process for the revamping of urea synthesis plants consisting of a stripper with ammonia Process for the revamping of urea production plants for the synthesis of ammonia (NH3) and carbon dioxide, with a stripping section with NH3, in which the process carries out with differentiated yields, a majority reaction a) between highly pure reagents ... | 08/14/2001 |
