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| Number | Title | Issue Date |
| 7977479 | Method for producing melamine with heat recovery The invention relates to a method for producing melamine by decomposing urea inside a fluidised bed reactor, during which the hot reaction gas is cooled inside a gas cooler, and the obtained heat is directly used for pre-heating the fluidizing gas required for creat... | 07/12/2011 |
| 7534883 | Process for the preparation of melamine The invention is directed to a process for the preparation of melamine connected through a carbamate concentration unit, comprising a desorption column in which a gas stream, comprising ammonia, carbon dioxide and water is generated, with a process for the preparati... | 05/19/2009 |
| 7414130 | Integrated process for urea and melamine production In an integrated process for urea and melamine production, urea is produced in a urea plant (12) comprising a high pressure urea synthesis section (15) and a urea recovery section (16) for separating urea from a carbamate aqueous solution, and m... | 08/19/2008 |
| 7385057 | Method and device for producing melamine in a single-phase tubular reactor The invention relates to a method and a device for producing melamine by means of the thermal conversion of urea. The invention is characterized in that: a) urea is reacted to form melamine at least partially under reaction conditions wherein an educt, an intermedia... | 06/10/2008 |
| 7375223 | High pressure method for producing pure melamine in a vertical synthesis reactor The invention relates to a high pressure method for producing pure melamine by pyrolyzing urea in a vertical synthesis reactor. The synthesis reactor has three stages above one another: a) in the first stage, the smaller portion of the total amount of urea is introd... | 05/20/2008 |
| 7311759 | Process for purifying off-gases of a melamine plant A two-stage process is provided for purifying off-gases from a high-pressure melamine plant. In the first stage, the off-gases are contacted with a recirculated urea melt containing melamine precursors and NH3. In the second stage, the off-gases are conta... | 12/25/2007 |
| 7267473 | Transfer system for coloring agents A system for transferring coloring agents for concrete to a ready mix truck or the like, includes a tank for receiving coloring agents. The tank includes lines for supplying it with water and a pump for transferring the coloring agents to the ready mix truck through... | 09/11/2007 |
| 7253280 | Two-stage reactor for the production of melamine The present invention relates to a process for the catalytic preparation of melamine by decomposition of urea over particular solid catalysts using a main reactor and an after-reactor. A catalyst having a low Lewis acidity is used in the main reactor and a catalyst ... | 08/07/2007 |
| 7214795 | Process for preparing melamine The invention relates to a process for preparing melamine, comprising a cooling step from which a mixture H2O containing NH3, CO2 and H2O is released, wherein: the mixture and a flow of l... | 05/08/2007 |
| 7176309 | Method for producing melem-free melamine and quenching agents The invention relates to a method for producing melem-free melamine by means of aqueous processing of a melted mass of melamine which is obtained using a high-pressure method. According to the inventive method, the melted mass of melamine is quenched by means of an ... | 02/13/2007 |
| 7153962 | Process for gently cooling and crystallizing melamine from a melamine melt or from the gaseous phase Process for cooling and crystallizing solid melamine from the gaseous phase or from melamine melts as they develop in technical processes used to produce melamine, characterized in that the melamine-containing process gases or melamine melts are introduced into liqu... | 12/26/2006 |
| 7125992 | Procedure for the production of high-purity melamine with high yields A process for the production of high-purity melamine by pyrolysis of urea at high pressure, wherein the liquid phase output from the pyrolysis reactor is sent to a downstream post-reactor, and wherein the anhydrous gaseous phase from the pyrolysis reactor and from t... | 10/24/2006 |
| 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 |
| 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 |
| 7045623 | Method for contacting molten urea with a gas stream The invention relates to a method for contacting molten urea with a gas stream that contains ammonia and/or carbon dioxide, in which use is made of an additional stream the temperature of which differs from the temperature of the molten urea and/or the gas stream. T... | 05/16/2006 |
| 7041822 | Method for purifying a melamine melt The invention relates to a method for producing pure melamine in a high-pressure method. According to said method, in the first stage, the melamine melt is brought into contact with hot NH3 and NH3 from the second stage and in the second step i... | 05/09/2006 |
| 7022848 | Process for the production of melamine A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH | 04/04/2006 |
| 6891040 | High yields, high purity melamine manufacturing process The process to recover both melamine and oxyaminotriazines (OAT) from the mother liquors of melamine crystallisation comprising the following steps: a) addition to a melamine and OAT containing aqueous solution at high temperature of an alkaline agent until the solu... | 05/10/2005 |
| 6870051 | Process for purifying melamine-containing ammonia A process for purifying gaseous melamine containing ammonia is provided. The method comprises partly condensing the gaseous melamine-containing ammonia to form melamine in liquid NH3 and purified NH3 gas. The melamine and purified NH3 | 03/22/2005 |
| 6870050 | Method for the production of melamine A process for preparing melamine by pyrolysis of urea in a high-pressure process, in which urea is reacted together with NH3 to give melamine and the melamine melt formed is fed together with further urea to a cooling reactor, with the melt being cooled t... | 03/22/2005 |
| 6835834 | Process for preparing melamine from urea Process for preparing melamine from urea at elevated temperature and in the presence of a catalyst, in which a gaseous product stream is obtained which is contacted with a liquid coolant in a cooling zone and in which a proportion of the concentrated aqueous carbama... | 12/28/2004 |
| 6825346 | Process for the production of melamine crystals at high pureness A process for producing melamine crystals at high pureness is distinguished by the fact that it comprises a crystallisation step of a flow comprising substantially pure melt melamine by cooling with liquid ammonia and a thickening step of the resulting suspension of... | 11/30/2004 |
| 6815545 | Method for producing melamine A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH | 11/09/2004 |
| 6790956 | Method for producing pure melamine The invention relates to a method for producing pure melamine. According to this method, the melamine melt, which is produced from urea in a high-pressure process, is cooled and ammonia is added until it reaches a temperature of approximately 1 to 50° C. above the ... | 09/14/2004 |
| 6774234 | Melamine purification process A process for the purification of melamine, deriving from urea, according to a high pressure non catalytic process, by means of polycondensates and other by-products transformation, which by-products derive from the melamine synthesis comprosing the following steps:... | 08/10/2004 |
| 6664392 | Process for the preparation of melamine Process for the preparation of melamine comprising a reaction step, a gas/liquid separation step in which a melamine melt is separated from off-gases, a stripping step and a cooling step, in which the stripping step is carried out at a pressure of between... | 12/16/2003 |
| 6617455 | Process for preparing melamine from urea Process for preparing melamine from urea at elevated temperature and in the presence of a catalyst, in which a gaseous product stream is obtained which is contacted with a liquid coolant in a cooling zone and that the temperature in the scrubbing section ... | 09/09/2003 |
| 6603001 | Process for preparing solid melamine The invention relates to a method for producing solid melamine by expanding liquid, ammoniacal melamine which is mixed with excess ammonia, whereby a dispersion is produced. Said dispersion is expanded, optionally after it has been held under ammonia pres... | 08/05/2003 |
| 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 |
| 6579980 | Method for preparing melamine Method for preparing melamine from urea via a high-pressure process in which solid melamine is obtained by transferring the melamine melt to an expansion vessel where the melamine melt is cooled by incorporated ammonia. Excess ammonia gas is added to the ... | 06/17/2003 |
| 6548669 | Method for preparing melamine A method for the production of melamine from urea via a high-pressure non-catalytic process in which molten urea is reacted to produce melamine, carbon dioxide, and ammonia, the by-product gases are separated from the melamine melt, and the melamine melt ... | 04/15/2003 |
| 6410727 | Method for purifying melamine The invention relates to a method for purifying melamine in which impure melamine is heated to a temperature range above 325°C. but lower than the melting point of melamine which depends on the prevailing ammonia pressure. In addition, the impure melamin... | 06/25/2002 |
| 6380385 | Process for the preparation of pure melamine A process for the preparation of pure melamine, in which liquid, ammonia-containing melamine is rapidly depressurized from an ammonia partial pressure p1 between 400 and 50 bar to an ammonia partial pressure p2 between 200 bar and at... | 04/30/2002 |
| 6355797 | Process for cooling melamine Process for cooling liquid melamine by mixing with solid melamine or with solid inert substances or with a mixture of solid melamine and solid inert substances.... | 03/12/2002 |
| 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 |
| 6303781 | Method for preparing melamine Method for preparing melamine from urea via a high-pressure process in which solid melamine is obtained by transferring the reactor product comprising liquid melamine, CO2 and NH3 to a gas/liquid separator and subsequently transferri... | 10/16/2001 |
| 6274731 | Method for preparing melamine Method for preparing melamine from urea via a high-pressure process in which solid melamine is obtained by transferring the melamine melt coming from the reactor to a vessel where the melamine melt is cooled with an evaporating cooling medium. The melamin... | 08/14/2001 |
| 6268459 | Method for preparing melamine Method for preparing melamine from urea via a high-pressure process in which solid melamine is obtained by transferring the melamine melt coming from the reactor to a vessel where the melamine melt is cooled with an evaporating cooling medium. The melamin... | 07/31/2001 |
| 6258950 | Method for the preparation of melamine The invention relates to a high-pressure process for producing melamine from urea in which highly pure melamine is obtained by transferring melamine melt leaving a melamine reactor to a cooling vessel where the melamine melt is cooled to a temperature of ... | 07/10/2001 |
| 6252074 | Process and apparatus for melamine manufacture High pressure melamine manufacturing process starting from urea with high yields and conversion rates characterized in that it comprises the following steps: a) urea is fed to a reactor essentially containing molten melamine, which reactor operates in con... | 06/26/2001 |
