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    PROCESS FOR MELAMINE PURIFICATION
    1.
    发明申请
    PROCESS FOR MELAMINE PURIFICATION 有权

    公开(公告)号：US20210332018A1

    公开(公告)日：2021-10-28

    申请号：US17368540

    申请日：2021-07-06

    申请人： Casale SA

    发明人： Andrea Scotto ,  Simone Gamba

    IPC分类号： C07D251/62 ,  C07D251/60

    摘要： A process for the purification of a melamine melt (5) containing melamine and by-products, comprising the steps of: (a1) In quenching of said melamine melt; (a2) decomposition of by-products with alkali, providing an alkaline aqueous solution of melamine (26); (b) stripping of said alkaline aqueous solution of melamine (26); (c) crystallization of melamine with a first alkali-containing solution (6b) and separation of solid melamine (7) from a mother liquor (8); (d) treatment of said mother liquor, providing a waste water stream (11) containing carbonates; (e) decomposition of at least part of the carbonates contained in said waste water stream (11) into carbon dioxide and alkali, providing a second alkali-containing aqueous solution (30); (f) recycle of at least part of said alkali-containing aqueous solution (30) to at least one of said steps (a1), (a2) and (c).

    Process for melamine purification
    2.
    发明授权
    Process for melamine purification 有权

    公开(公告)号：US11059793B2

    公开(公告)日：2021-07-13

    申请号：US16318736

    申请日：2017-06-21

    申请人： Casale SA

    发明人： Andrea Scotto ,  Simone Gamba

    IPC分类号： C07D251/62 ,  C07D251/60

    摘要： A process for the purification of a melamine melt (5) containing melamine and by-products, comprising the steps of: (a1) quenching of said melamine melt; (a2) decomposition of by-products with alkali, providing an alkaline aqueous solution of melamine (26); (b) stripping of said alkaline aqueous solution of melamine (26); (c) crystallization of melamine with a first alkali-containing solution (6b) and separation of solid melamine (7) from a mother liquor (8); (d) treatment of said mother liquor, providing a waste water stream (11) containing carbonates; (e) decomposition of at least part of the carbonates contained in said waste water stream (11) into carbon dioxide and alkali, providing a second alkali-containing aqueous solution (30); (f) recycle of at least part of said alkali-containing aqueous solution (30) to at least one of said steps (a1), (a2) and (c).

    Method and system for the integrated production of urea and melamine
    3.
    发明授权
    Method and system for the integrated production of urea and melamine 有权

    公开(公告)号：US10358413B2

    公开(公告)日：2019-07-23

    申请号：US15568795

    申请日：2016-04-25

    申请人： Stamicarbon B.V.

    发明人： Johannes Henricus Mennen

    IPC分类号： C07D251/60 ,  C07D251/62 ,  C07C273/12 ,  B01J19/24

    摘要： Disclosed is an integrated process for the production of urea and melamine, as well as a system for carrying out the process. The invention thereby pertains to an integrated process of the type wherein off-gas obtained from the production of melamine is entered into the process for the production of melamine, by condensation in the presence of water. A typical embodiment thereof is the condensation in the presence of an aqueous carbamate solution obtained from urea recovery. In accordance with the invention, said condensation takes place at a substantially lower pressure than the pressure at which the melamine off-gas is obtained. To this end, the pressure of the off-gas is reduced typically by 2-10 bar. In connection herewith, the system of the invention comprises a pressure reducing unit downstream of an outlet for the melamine off-gas, and upstream of a section for the condensation of the off-gas. The invention also includes a method for the modernization of an integrated system for the production of melamine and urea. This is accomplished by adding the aforementioned pressure reducing unit to a pre-existing system.

    PROCESS FOR THE PRODUCTION OF HIGH PURITY MELAMINE FROM UREA
    6.
    发明申请
    PROCESS FOR THE PRODUCTION OF HIGH PURITY MELAMINE FROM UREA 有权
    从尿素生产高纯度甲酰胺的方法

    公开(公告)号：US20110003990A1

    公开(公告)日：2011-01-06

    申请号：US12920730

    申请日：2009-02-24

    申请人： Giancarlo Sioli

    发明人： Giancarlo Sioli

    IPC分类号： C07D251/62 ,  B01J8/00

    CPC分类号： C07D251/62 ,  B01D9/0013 ,  B01J19/006 ,  B01J19/18 ,  B01J19/1862 ,  B01J19/1881 ,  B01J2219/00083 ,  B01J2219/00768 ,  C07D251/46 ,  C07D251/52 ,  C07D251/60

    摘要： The present invention concerns process for obtaining melamine at high purity characterized by comprising the steps of:—quenching a melamine melt, deprived of off-gases of the melamine synthesis and containing melamine impurities such as ammeline, ammelide and polycondensates, with an aqueous solution comprising ammonia under conditions such to substantially convert polycondensates into melamine, obtaining a melamine solution substantially free of polycondensates, recovering melamine from said melamine solution by melamine crystallisation, obtaining melamine crystals and a melamine crystallization mother liquor,—treating said crystallization melamine mother liquor under conditions such to convert at least a portion of its ammeline content into ammelide and melammine, obtaining a treated mother liquid having at least a reduced ammeline content. The invention also concerns a high-pressure non-catalytic plant for the production of high-purity melamine implementing the above process and apparatuses suitable to be used in this plant.

    摘要翻译： 本发明涉及获得高纯度三聚氰胺的方法，其特征在于包括以下步骤： - 将三聚氰胺熔体淬灭，剥去三聚氰胺合成物的废气，并含有三聚氰胺杂质如氨米林，ammelide和缩聚物，其中包含 在基本上将缩聚物转化为三聚氰胺的条件下，得到基本上不含缩聚物的三聚氰胺溶液，通过三聚氰胺结晶从所述三聚氰胺溶液中回收三聚氰胺，获得三聚氰胺晶体和三聚氰胺结晶母液，在所述三聚氰胺结晶母液条件下， 将其至少一部分的ammeline含量转化成ammelide和melamine，得到至少具有降低的ammeline含量的经处理的母液。 本发明还涉及用于生产高纯度三聚氰胺的高压非催化装置，其实施上述方法和适用于该装置的装置。

    Crystalline melamine
    8.
    发明授权
    Crystalline melamine 有权
    结晶三聚氰胺

    公开(公告)号：US6166204A

    公开(公告)日：2000-12-26

    申请号：US266809

    申请日：1999-03-12

    申请人： Tjay T. Tjioe

    发明人： Tjay T. Tjioe

    IPC分类号： C07D251/62 ,  C07D251/60

    CPC分类号： C07D251/62

    摘要： Multicrystalline melamine powder having the following properties:specific surface area: 0.7-5 m.sup.2 /glevel of oxygen-containing components 98.5 wt %melam:

    摘要翻译： 具有以下特性的多结晶三聚氰胺粉末：比表面积：0.7-5m 2 / g含氧组分含量<0.7wt％颜色APHA小于17三聚氰胺：> 98.5wt％二聚氰胺：<1.3wt％多晶三聚氰胺粉末可通过 通过三聚氰胺熔体将三聚氰胺熔体转移到三聚氰胺熔体用蒸发冷却介质冷却的容器中获得固体三聚氰胺的高压方法，三聚氰胺熔体的三聚氰胺熔点与450℃之间的温度为 用0.1-15摩尔氨/摩尔三聚氰胺进行处理，然后通过喷雾装置喷雾，并在蒸气冷却介质中，在氨气环境中，氨压力为0.1〜25MPa，在容器内冷却，将三聚氰胺熔体转化为三聚氰胺 温度在200℃和三聚氰胺的凝固点之间的粉末，然后将三聚氰胺粉末冷却到低于50℃的温度，将粉末置于运动中 在至少部分冷却范围内机械地直接或间接冷却，氨压力在270℃以下释放。

    Process for the preparation of melamine
    9.
    发明授权
    Process for the preparation of melamine 失效
    三聚氰胺的制备方法

    公开(公告)号：US4433146A

    公开(公告)日：1984-02-21

    申请号：US368972

    申请日：1982-04-16

    申请人： Jozeph H. M. Beckers ,  Rudolf Sipkema

    发明人： Jozeph H. M. Beckers ,  Rudolf Sipkema

    IPC分类号： C07D251/60 ,  C07D251/62

    CPC分类号： C07D251/62 ,  C07D251/60

    摘要： An improved process for the preparation of melamine from urea or thermal decomposition products thereof wherein ammonia, carbon dioxide, and water vapor are condensed at a pressure of between about 0.5 and 70 bar to form an aqueous solution of ammonium carbamate, and such solution is increased in pressure to at least 100 bar and heated prior to being introduced into a urea synthesis zone wherein at least a portion of the ammonium carbamate is converted into urea. The aqueous solution of ammonium carbamate is heated sufficiently to decompose a portion of the ammonium carbamate into ammonia and carbon dioxide to form a gas-liquid mixture for introduction into the urea synthesis zone such that the heat released by recondensation of the ammonia and carbon dioxide is at least sufficient to provide all of the heat required for the conversion of ammonium carbamate into urea.

    摘要翻译： 用于从尿素或其热分解产物制备三聚氰胺的改进方法，其中氨，二氧化碳和水蒸汽在约0.5至70巴之间的压力下冷凝以形成氨基甲酸铵水溶液，并且这种溶液增加 在至少100巴的压力下加热，然后被引入尿素合成区，其中至少一部分氨基甲酸铵被转化成尿素。 将氨基甲酸铵水溶液充分加热，将一部分氨基甲酸铵分解为氨和二氧化碳，形成气液混合物，引入尿素合成区，使得氨和二氧化碳的再缩短释放的热量为 至少足以提供将氨基甲酸铵转化成尿素所需的全部热量。

    Aminotriazinepolycarboxylic acids and partial esters thereof
    10.
    发明授权
    Aminotriazinepolycarboxylic acids and partial esters thereof 失效
    氨基三氮杂多羧酸及其偏酯

    公开(公告)号：US4291162A

    公开(公告)日：1981-09-22

    申请号：US169063

    申请日：1980-07-15

    申请人： Derek J. R. Massy

    发明人： Derek J. R. Massy

    IPC分类号： C07D251/18 ,  C07D251/62 ,  C07D251/70 ,  C08G59/42 ,  C08G59/52 ,  C08K5/00 ,  C08K5/34 ,  C08K5/3477 ,  C07D251/48

    CPC分类号： C07D251/70 ,  C07D251/18 ,  C07D251/62 ,  C08G59/423 ,  C08G59/4238 ,  C08G59/52

    摘要： New compounds of formula ##STR1## where R.sup.1 represents --NR.sup.2 R.sup.3, an alkyl group, a mononuclear aryl group, a phenylalkylene group, or a group of formula ##STR2## R.sup.2 and R.sup.3 each represent --H, --CHR.sup.4 OR.sup.5, --CHR.sup.4 --S--R.sup.6 --COOQ, or ##STR3## R.sup.2 and R.sup.3 in formulae I and III being such that at most one represents a group of formula III and at least two each represent a group --CHR.sup.4 --S--R.sup.6 --COOQ,R.sup.4 and R.sup.5 represent --H or alkyl groups,R.sup.6 is an alkylene group, optionally substituted by a carboxyl group,at least two Q in formula I represent --H and the remainder may alternatively represent alkyl groups,m is 1, 2, or 3, andn is zero or 1,e.g., hexakis(N-2-carboxyethylthiomethyl)melamine, a tris(N-2-carboxyethylthiomethyl)tris(N-2-(butoxymethyl)melamine, or tetrakis(N-2-carboxyethylthiomethyl)acetoguanamine,are useful as curing agents for epoxide resins.

    摘要翻译： 新的式（I）化合物，其中R 1表示-NR 2 R 3，烷基，单核芳基，苯基亚烷基或式II基团和R 2基团各自表示-H，-CHR 4 OR 5，-CHR 4 - 式I和III中的S-R6-COOQ或 III R2和R3使得至多一个表示式III的基团，并且至少两个表示-CHR4-S-R6-COOQ基团，R4和 R5代表-H或烷基，R6是任选被羧基取代的亚烷基，式I中至少两个Q代表-H，余数可以代表烷基，m是1,2或3，和 n为0或1，例如六（N-2-羧乙硫基甲基）三聚氰胺，三（N-2-羧乙基硫甲基）三（N-2-（丁氧基甲基）三聚氰胺或四（N-2-羧乙硫基甲基）乙酰胍胺 可用作环氧树脂的固化剂。