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    METHOD FOR REVAMPING A HIGH PRESSURE MELAMINE PLANT
    2.
    发明公开
    METHOD FOR REVAMPING A HIGH PRESSURE MELAMINE PLANT 审中-公开
    一种高压三聚氰胺植物的翻新方法

    公开(公告)号：EP3208264A1

    公开(公告)日：2017-08-23

    申请号：EP16156505.6

    申请日：2016-02-19

    Applicant: Casale SA

    Inventor： DI CARLO, Gabriele ,  SCOTTO, Andrea ,  GAMBA, Simone

    IPC: C07D251/60 ,  C07C273/12

    CPC classification number: C07D251/60 ,  B01J2219/00006 ,  B01J2219/00024 ,  C07C273/12

    Abstract: A high pressure melamine plant comprising a synthesis section and a melamine purification section, wherein the synthesis section provides a first melamine-containing stream (6), and said melamine purification section comprises: a quencher (2) receiving said first melamine-containing stream (6) from the synthesis section; a stripper (3) fed with a second melamine-containing stream (7) from said quencher (2), wherein purified melamine (11) is collected and vapours (10) are extracted; a heat exchanger (12), wherein said vapours (10) are condensed providing a condensed stream (14); an absorber (4) fed with said condensed stream (14) providing an aqueous solution (15) comprising ammonia and carbon dioxide, at least a portion (15b) of said aqueous solution being exported from the purification section (200) of the plant.

    Abstract translation: 一种包含合成部分和三聚氰胺纯化部分的高压三聚氰胺装置，其中所述合成部分提供第一含三聚氰胺的物流（6），并且所述三聚氰胺纯化部分包括：猝灭剂（2），其接收所述第一含三聚氰胺物流 6）来自合成部分; （3），其用来自所述猝灭剂（2）的第二含三聚氰胺的料流（7）进料，其中收集纯化的三聚氰胺（11）并提取蒸气（10）; 热交换器（12），其中所述蒸气（10）被冷凝以提供冷凝流（14）; （14）供给的含有氨和二氧化碳的水溶液（15）的吸收器（4），所述水溶液的至少一部分（15b）从所述设备的净化部分（200）输出。

    METHOD FOR COOLING A MELAMINE MELT
    4.
    发明公开
    METHOD FOR COOLING A MELAMINE MELT 审中-公开
    VERFAHREN ZURKÜHLUNGEINER MELAMINSCHMELZE

    公开(公告)号：EP2907808A1

    公开(公告)日：2015-08-19

    申请号：EP13845206.5

    申请日：2013-09-09

    Applicant: Otkrytoe Aktsionernoe Obschestvo Research & Design Institute Of Urea And Organic Synthesis Products (OAO NIIK)

    Inventor： NIKOLAEV, Evgeny Yuryevich ,  SKUDIN, Alexei Georgievich ,  PECHNIKOVA, Galina Nikolaevna ,  PROKOPYEV, Aleksandr Alekseevich ,  KUZNETSOV, Nikolai Mikhailovich ,  KOSTIN, Oleg Nikolaevich ,  ESIN, Igor Veniaminovich

    IPC: C07D251/60

    CPC classification number: C07D251/60 ,  C07D251/54

    Abstract: The invention relates to methods for cooling a melamine melt using water and aqueous solutions. The invention can be used in industrial production of melamine. The method for cooling a melamine melt involves cooling a melamine melt with water to temperature of 130-230°C in a cooling zone, with evaporation of water and formation of solid melamine-water vapour gaseous suspension. Melamine is removed from the cooling zone in form of solid melamine-water vapour gaseous suspension. Before removal from the cooling zone, nitrogen, air or a mixture thereof can be added to the formed solid melamine-water vapour gaseous suspension. The technical result which can be achieved using the invention is lowering degree of hydrolysis of melamine when cooling melamine melt with water as well as a simplification of the process.

    Abstract translation: 本发明涉及使用水和水溶液冷却三聚氰胺熔体的方法。 本发明可用于工业生产三聚氰胺。 用于冷却三聚氰胺熔体的方法包括在冷却区中用水将三聚氰胺熔体冷却至130-230℃，蒸发水并形成固体三聚氰胺 - 水蒸汽气态悬浮液。 三聚氰胺以固体三聚氰胺 - 水蒸汽气态悬浮液的形式从冷却区中除去。 在从冷却区中取出之前，可将氮气，空气或其混合物加入到形成的固体三聚氰胺 - 水蒸汽气态悬浮液中。 使用本发明可以实现的技术结果是在用水冷却三聚氰胺熔体时降低三聚氰胺的水解度以及简化工艺。

    Combined reactor for high-pressure synthesis of melamine
    5.
    发明公开
    Combined reactor for high-pressure synthesis of melamine 审中-公开
    Kombinierter ReaktorfürHochdrucksynthese von Melamin

    公开(公告)号：EP2907567A1

    公开(公告)日：2015-08-19

    申请号：EP14155561.5

    申请日：2014-02-18

    Applicant: CASALE SA

    Inventor： Rizzi, Enrico

    IPC: B01J10/00 ,  B01J19/24 ,  B01J3/04 ,  B01J4/02 ,  C07D251/60

    CPC classification number: C07D251/60 ,  B01J3/04 ,  B01J4/02 ,  B01J10/00 ,  B01J10/005 ,  B01J19/246 ,  B01J2219/00078 ,  B01J2219/00081 ,  B01J2219/24 ,  C07D251/62

    Abstract: A reactor and associated process for the high-pressure synthesis of melamine from urea, comprising a primary step of conversion of the urea into crude melamine inside a first chamber delimited by a shell inside a reactor body and a secondary step of stripping said crude melamine melt inside a second reaction chamber, which is coaxial with and situated outside said first chamber, inside the same reactor body.

    Abstract translation: 一种用于从尿素高压合成三聚氰胺的反应器和相关方法，包括在由反应器主体内的壳界定的第一室内将尿素转化成粗三聚氰胺的第一步骤和将所述粗三聚氰胺熔体 在同一个反应器体内的第二个反应室内，与第一室同轴并位于第二反应室外。

    VERFAHREN ZUR HERSTELLUNG VON MELAMIN
    8.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON MELAMIN 有权

    公开(公告)号：EP2212302A2

    公开(公告)日：2010-08-04

    申请号：EP08838802.0

    申请日：2008-10-14

    Applicant: BASF SE

    Inventor： KERN, Andreas ,  PRÖBSTLE, Hans-Ulrich ,  JOHN, Tilo ,  STEINER, Wolfgang ,  MAAS, Heiko

    IPC: C07D251/60

    CPC classification number: C07D251/60 ,  C07D251/62

    Abstract: The invention relates to a method for the production of melamine by reaction of urea in the presence of a solid catalyst in one or more serial reactors in the temperature range 370 °C to 430 °C, cooling and filtering the gases produced in the urea reaction, separation of the melamine by desublimation and recycling a part of the gases produced after separation of the melamine ('recycle gas') into the reactor or reactors, characterised in that all given steps are carried out at a pressure in the range 4 bar to 10 bar.

    Abstract translation: 本发明涉及一种通过尿素在固体催化剂存在下在一个或多个串联反应器中在370℃至430℃的温度范围内反应生产三聚氰胺的方法，冷却和过滤在脲反应中产生的气体 ，通过凝华分离三聚氰胺并将三聚氰胺（“再循环气体”）分离后产生的一部分气体再循环到一个或多个反应器中，其特征在于所有给定的步骤都在4巴至 10巴。

    GASWÄSCHER UND VERWENDUNG DES GASWÄSCHERS IN DER MELAMINPRODUKTION
    9.
    发明公开
    GASWÄSCHER UND VERWENDUNG DES GASWÄSCHERS IN DER MELAMINPRODUKTION 有权
    用三聚氰胺生产涤气器

    公开(公告)号：EP2125165A1

    公开(公告)日：2009-12-02

    申请号：EP08707671.7

    申请日：2008-02-12

    Applicant: Lurgi GmbH

    Inventor： SCHADT, Arne ,  EBERHARDT, Juergen ,  MUELLER-HASKY, Martin

    IPC: B01D53/18 ,  B01J19/00 ,  C07D251/60 ,  C07D251/62

    CPC classification number: B01D53/185 ,  C07D251/60

    Abstract: In a gas scrubber (10), a gas stream (27) containing at least one sublimated substance is brought into contact with a liquid or melt stream which contains at least one thermally convertible substance (8) and has a lower temperature than the gas stream. For intensive and intimate mixing of the gas stream with the liquid stream or melt stream, in the upper part of the gas scrubber (10) there is provided a perforated plate (38) having a plurality of holes (39) each surrounded by a throttling rim (40) and above the perforated plate feeds are provided for the gas stream (27) and the liquid or melt stream (8).

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