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    COMBINED REACTOR FOR HIGH-PRESSURE SYNTHESIS OF MELAMINE
    1.
    发明公开
    COMBINED REACTOR FOR HIGH-PRESSURE SYNTHESIS OF MELAMINE 审中-公开

    公开(公告)号：EP3838398A1

    公开(公告)日：2021-06-23

    申请号：EP19218435.6

    申请日：2019-12-20

    Applicant: CASALE SA

    Inventor： GAMBA, Simone ,  DI CARLO, Gabriele ,  RIZZI, Enrico

    IPC: B01J19/24 ,  B01J19/00 ,  B01J3/04 ,  B01J4/02 ,  B01J10/00 ,  C07C273/12 ,  C07D251/62

    Abstract: Reactor for the high-pressure non-catalytic synthesis of melamine from urea, comprising coaxial inner reaction zone (6) and outer reaction zone (7) wherein a crude melamine is formed in the inner reaction zone and contacted with gaseous ammonia for stripping in the outer reaction zone, wherein a gaseous phase liberated in the outer zone is collected in a gas collection chamber (12) above the reaction zones, wherein the crude melamine melt is transferred from the inner zone into the outer zone via a submerged liquid passage below the liquid level to provide a liquid seal between the chambers.

    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

    公开(公告)号：EP3521278A1

    公开(公告)日：2019-08-07

    申请号：EP19160019.6

    申请日：2017-01-25

    Applicant: CASALE SA

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

    IPC: C07D251/60

    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.

    PROCESS FOR THE SYNTHESIS OF MELAMINE
    3.
    发明公开
    PROCESS FOR THE SYNTHESIS OF MELAMINE 审中-公开

    公开(公告)号：EP4245754A1

    公开(公告)日：2023-09-20

    申请号：EP22162328.3

    申请日：2022-03-15

    Applicant: CASALE SA

    Inventor： GAMBA, Simone ,  FILIPPI, Ermanno

    IPC: C07D251/60 ,  B01J10/00 ,  C07C273/12

    Abstract: A process for the high-pressure non-catalytic synthesis of melamine from urea wherein various heat inputs of the process are provided electrically, the process comprises reacting urea to form melamine in a synthesis reactor provided with electrical heating elements, the process further comprises heating the melamine melt electrically during transport and/or using electrically produced heat to remove water from melamine crystals.

    METHOD FOR REVAMPING A HIGH PRESSURE MELAMINE PLANT
    6.
    发明公开
    METHOD FOR REVAMPING A HIGH PRESSURE MELAMINE PLANT 审中-公开

    公开(公告)号：EP3416953A1

    公开(公告)日：2018-12-26

    申请号：EP17701154.1

    申请日：2017-01-25

    Applicant: Casale SA

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

    IPC: C07D251/60 ,  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.

    MELAMINE PROCESS WITH A TWO-STAGE PURIFICATION OF MELAMINE OFFGAS
    8.
    发明公开
    MELAMINE PROCESS WITH A TWO-STAGE PURIFICATION OF MELAMINE OFFGAS 审中-实审

    公开(公告)号：EP4349817A1

    公开(公告)日：2024-04-10

    申请号：EP23158350.1

    申请日：2023-02-23

    Applicant: CASALE SA

    Inventor： GAMBA, Simone

    IPC: C07D251/54 ,  C07D251/60

    Abstract: A process for the synthesis of melamine including the purification of the offgas released by the synthesis of melamine by means of a first purification stage followed by a second purification stage (7); in the first purification stage (6) the offgas (3) is contacted with urea melt from the second stage (7) and with a recirculated urea melt (8, 9) containing ammonia and melamine precursors (5); in the second purification stage (7) the offgas from the first stage is contacted with fresh urea melt (15); said recirculated urea melt is withdrawn from bottom of the first stage and cooled in a shell and tube heat exchanger (11) to a temperature of not less than 165 °C, preferably in the range 165 °C to 245 °C, prior to reintroduction in said first stage.

    PROCESS FOR MELAMINE PURIFICATION
    10.
    发明公开
    PROCESS FOR MELAMINE PURIFICATION 审中-公开
    三聚氰胺净化工艺

    公开(公告)号：EP3272743A1

    公开(公告)日：2018-01-24

    申请号：EP16180820.9

    申请日：2016-07-22

    Applicant: Casale SA

    Inventor： SCOTTO, Andrea ,  GAMBA, Simone

    IPC: C07D251/60 ,  C07D251/62

    CPC classification number: C07D251/60 ,  C07D251/62

    Abstract: 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).

    Abstract translation: 一种纯化含三聚氰胺和副产物的三聚氰胺熔体（5）的方法，包括以下步骤：（a1）所述三聚氰胺熔体骤冷; （a2）用碱分解副产物，提供三聚氰胺的碱性水溶液（26）; （b）汽提所述三聚氰胺碱性水溶液（26）; （c）用第一种含碱溶液（6b）结晶三聚氰胺并从母液（8）中分离固体三聚氰胺（7）; （d）处理所述母液，提供含碳酸盐的废水流（11）; （e）将包含在所述废水流（11）中的至少一部分碳酸盐分解成二氧化碳和碱，提供第二含碱水溶液（30）; （f）将至少部分所述含碱水溶液（30）循环至所述步骤（a1），（a2）和（c）中的至少一个。

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