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7589198 Process for the preparation of melamine  
Process for the preparation of melamine, comprising a first mixing step in which at least two melamine-containing flows, originating from at least two different processes for the preparation of...
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,...
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...
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...
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...
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...
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...
7214795 Process for preparing melamine  
The invention relates to a process for preparing melamine, comprising a cooling step from which a mixture H 2 O containing NH 3 , CO 2 and H 2 O is released, wherein: the mixture and a flow...
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...
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...
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...
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...
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....
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...
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 NH 3 and...
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...
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...
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 NH 3 and purified...
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 NH 3 to give melamine and the melamine melt formed is fed together with...
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...
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...
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...
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...
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...
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...
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...
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 NH 3 and CO 2 are introduced into...
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...
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...
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...
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 p 1 between 400 and 50 bar to an ammonia...
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.
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...
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, CO 2 and NH 3 to a...
6262261 Process for the preparation of melamine  
Process for the preparation of melamine from urea via a high-pressure process in which dry melamine powder is obtained by transferring the melamine melt leaving the reactor to a vessel in which the...
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...
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...
6166204 Crystalline melamine  
Multicrystalline melamine powder having the following properties: specific surface area: 0.7-5 m 2 /g level of oxygen-containing components <0.7 wt % color APHA less than 17 ...
6136827 Cyclic amine modulations of chemokine receptor activity  
The present invention is directed to cyclic amines of the formula I: ##STR1## (wherein R 1 , R 2 , R 3 , m and n are defined herein) which are useful as modulators of chemokine receptor activity....
5731437 Process for the preparation of melamine  
The invention relates to a process for the preparation of melamine from urea by feeding molten urea and hot ammonia gas into a reactor having a pressure within the range 50-150 bar and a...
5721363 Process for the production of highly pure melamine  
Process for the production of highly pure melamine in which an aftertreatment of the melamine is carried out, comprising the steps a) separating off the NH 3 /CO 2 gas mixture from the liquid...
5578723 Process for preparing cyanuric acid by seperation from an isocyanic acid/ammonia gas mixture  
A process for preparing cyanuric acid by cooling an isocyanuric acid/ammonia gas mixture having a temperature of 300° to 480° C. to 200°-300° C., whereupon cyanuric acid is separated off and...
5556864 α-ω-diarylalkane compounds serotonin-2 receptor agonists  
Compounds of formula (I): ##STR1## [wherein: R 1 is aryl; R 2 is hydrogen, alkyl, alkoxy, halogen or cyano; R 3 is a group of formula --B--NR 4 R 5 , where R 4 and R 5 are independently...
5514796 Melamine of improved purity produced by high-pressure, non-catalytic process  
A high-pressure, non-catalytic process for producing melamine from urea wherein the melamine is recovered directly as a dry powder without washing or recrystallization is described. In the process,...
5384404 Process for manufacturing melamine from urea  
An improved process for manufacturing melamine from urea simplifies the recovery of melamine, carbamate and ammonia from a fluidized bed reactor effluent stream by operating the process at a...
5350849 Process for the preparation of melamine from urea  
The invention relates to a selective removal of impurities from the gas stream leaving a melamine synthesis reactor in the preparation of melamine from urea by means of a treatment with steam at...
5236921 Arylalkylamines, process for preparing them and pharmaceutical compositions containing them  
The invention relates to compounds of formula: ##STR1## in which Y represents--either a group Cy--N in which Cy represents a phenyl, optionally substituted; a C 3 -C 7 cycloalkyl group; a...
4826975 Fused cycloaliphatic aminoalcohols  
The invention is concerned with fused cycloaliphatic aminoalcohols having pharmacological activity as anti-hypertensive, platelet aggregation inhibiting, hypolipemic, antianoxic and spasmolytic...
4625061 Process for preparing cyanamide  
An improved process for the preparation of cyanamide or a cyanamide-containing gas mixture by passing urea and/or urea decomposition products over a catalyst at a temperature in the range of...
4591644 Method and installation for the preparation of melamine  
An improved method for the preparation of melamine from urea and/or thermal decomposition products thereof. The melamine reactor synthesis effluent is quenched by means of an aqueous medium to form...
Matches 1 - 50 out of 105 1 2 3 >