公开(公告)号：EP3286165A1

公开(公告)日：2018-02-28

申请号：EP16732782

申请日：2016-04-25

Applicant: STAMICARBON

Inventor： MENNEN JOHANNES HENRICUS

IPC: C07C273/12

CPC classification number: C07C273/12 ,  C07D251/60 ,  Y02P20/125

Abstract: 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.

公开(公告)号：EP3083571A1

公开(公告)日：2016-10-26

申请号：EP14825459.2

申请日：2014-12-16

Applicant: Stamicarbon B.V.

Inventor： MENNEN, Johannes Henricus

IPC: C07D251/60 ,  C07C273/12

CPC classification number: C07D251/60 ,  B01J19/245 ,  B01J2219/00103 ,  B01J2219/24 ,  C07C273/12 ,  C07D251/62

Abstract: Disclosed is a process for the integrated production of urea and melamine. A urea production zone produces a urea synthesis stream comprising urea, water and ammonium carbamate. This stream is subjected to processing, preferably involving stripping, so as to separate an aqueous urea stream from residual dissociated carbamate vapor comprising ammonia, carbon dioxide, and water. The urea is fed to a melamine synthesis zone and subjected to melamine forming conditions so as to form melamine and off-gas comprising carbon dioxide and ammonia. The dissociated carbamate vapor and the melamine off-gas are subjected to combined condensation so as to form a dilute melamine off-gas condensate.

Abstract translation: 公开了一种尿素和三聚氰胺的综合生产方法。 尿素生产区产生包含尿素，水和氨基甲酸铵的尿素合成物流。 对该料流进行处理，优选涉及汽提，以便将含水的尿素流与包含氨，二氧化碳和水的残留的解离的氨基甲酸酯蒸气分离。 将尿素进料到三聚氰胺合成区，并进行三聚氰胺形成条件，以形成包含二氧化碳和氨的三聚氰胺和废气。 解离的氨基甲酸盐蒸汽和三聚氰胺废气进行组合冷凝，以形成稀的三聚氰胺尾气冷凝物。

公开(公告)号：EP0923541A1

公开(公告)日：1999-06-23

申请号：EP97937897.0

申请日：1997-08-29

Applicant: DSM N.V.

Inventor： VAN WIJCK, Julius, Gerardus, Theodorus

IPC: C07C273 ,  C07C275 ,  C07D251

CPC classification number: C07C273/12 ,  C07D251/60 ,  Y02P20/582

Abstract: 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 section of a urea stripping plant and is used in the synthesis of urea. The off-gas stream can be used directly without any further treatment.

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。

公开(公告)号：EP1918274A1

公开(公告)日：2008-05-07

申请号：EP06022990.3

申请日：2006-11-04

Applicant: UREA CASALE S.A.

Inventor： Zardi, Federico ,  Sticchi, Paolo ,  Brunengo, Paolo

IPC: C07C273/12

CPC classification number: C07D251/62 ,  B01J19/245 ,  B01J2219/24 ,  C07C273/12 ,  C07C273/16 ,  Y02P20/125 ,  Y02P20/582

Abstract: In an integrated process for urea and melamine production, urea is produced in a urea plant (10) comprising a high pressure urea synthesis section (11) from which an aqueous solution comprising urea, ammonium carbamate and ammonia is obtained and a urea recovery section (21) operating at low pressure, and melamine is produced in a melamine plant (40) wherein off-gases resulting as by-products of the melamine synthesis are discharged from said plant at a medium pressure and recycled to the high-pressure urea synthesis section (11).

Abstract translation: 在用于尿素和三聚氰胺生产的综合方法中，在包含高压尿素合成段（11）的尿素装置（10）中生产尿素，从其中获得包含尿素，氨基甲酸铵和氨的水溶液和尿素回收段（ 21），在三聚氰胺装置（40）中产生三聚氰胺，其中作为三聚氰胺合成的副产物产生的废气在中压下从所述设备排出并再循环到高压尿素合成段 （11）。

公开(公告)号：EP1879857A1

公开(公告)日：2008-01-23

申请号：EP06747544.2

申请日：2006-05-15

Applicant: DSM IP Assets B.V.

Inventor： MENNEN, Johannes, Henricus ,  TJIOE, Tjay, Tjien

IPC: C07C273/12

CPC classification number: C07C273/12

Abstract: The invention relates to a method for concentrating an aqueous ammonium carbamate stream, which has been formed in a process for the preparation of urea, has a pressure between 0.20 MPa and 0.9 MPa, a temperature between 35 °C and 95 °C, and contains at least 25 wt.% H2O, comprising: a pressure increase step, in which the aqueous ammonium carbamate stream is increased in pressure to a pressure between 1.0 MPa and 7 MPa; a condensation step, in which the aqueous ammonium carbamate stream is contacted with a gas stream, which has been formed in a process for the preparation of melamine and which consists essentially of NH3, CO2 and optionally H2O and has a lower H2O content than the aqueous ammonium carbamate stream, the gas stream being absorbed in the aqueous ammonium carbamate stream in such a way that a concentrated ammonium carbamate stream is formed that contains between 15 and 35 wt.% H2O; a discharge step, in which the concentrated ammonium carbamate stream is separated and discharged.

公开(公告)号：EP1634869A9

公开(公告)日：2006-06-07

申请号：EP04021455.3

申请日：2004-09-09

Applicant: UREA CASALE S.A.

Inventor： Porro, Lino

IPC: C07C273/12

CPC classification number: C07C273/12 ,  Y02P20/125

Abstract: Integrated process for urea/melamine production comprising the operating steps of:

(a)- urea synthesis from ammonia and carbon dioxide, obtaining molten urea and a gaseous mixture comprising steam and ammonia;
(b)- condensation of said gaseous mixture comprising steam and ammonia, obtaining a cold aqueous ammoniacal solution;
(c)- melamine synthesis from urea with formation of off-gases, comprising ammonia and carbon dioxide;
(d)- absorption of the off-gases in at least one fraction of the cold aqueous ammoniacal solution obtained in said step (b), with formation of a carbamate aqueous solution;
(e)- decomposition of the carbamate aqueous solution, obtaining ammonia, carbon dioxide and steam, and a residual aqueous ammoniacal solution;
(f)- recycling of the ammonia and of the carbon dioxide obtained in step (e) for the urea synthesis;
(g)- treatment of the residual aqueous ammoniacal solution obtained in step (e) for the recovery from it of ammonia and carbon dioxide for the urea synthesis.

Abstract translation: 包括以下操作步骤的尿素/三聚氰胺生产的综合方法：（a）由氨和二氧化碳合成尿素，获得熔融尿素和包含蒸汽和氨的气体混合物; （b） - 将所述包含蒸汽和氨的气体混合物冷凝，获得冷的氨水溶液; （c） - 由尿素合成三聚氰胺并形成含有氨和二氧化碳的废气; （d） - 在所述步骤（b）中获得的至少一部分冷氨水溶液中吸收废气，同时形成氨基甲酸酯水溶液; （e） - 氨基甲酸酯水溶液的分解，获得氨，二氧化碳和蒸汽以及残余的含水氨溶液; （f） - 循环步骤（e）中获得的氨和二氧化碳用于尿素合成; （g） - 处理步骤（e）中获得的残留氨性水溶液以从中回收氨和二氧化碳以合成尿素。

公开(公告)号：EP1525187A1

公开(公告)日：2005-04-27

申请号：EP03771489.6

申请日：2003-07-10

Applicant: DSM IP Assets B.V.

Inventor： TJIOE, Tjay, Tjien ,  MEESSEN, Jozef, Hubert

IPC: C07C273/12

CPC classification number: C07C273/12

Abstract: 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 the additional installation of a melamine plant and the urea melt from the urea recovery section of the urea plant being fed wholly or partly to the melamine plant and the residual gases from the melamine plant being returned wholly or partly to the high-pressure synthesis section and/or the urea recovery section of the urea plant.

公开(公告)号：EP3277661A1

公开(公告)日：2018-02-07

申请号：EP16712266.2

申请日：2016-03-11

Applicant: CASALE SA

Inventor： RIZZI, Enrico

IPC: C07C273/04 ,  C07C273/12 ,  C07C275/00 ,  B01J19/10

CPC classification number: B01J19/10 ,  B01J19/246 ,  B01J2219/0877 ,  C07C273/04 ,  C07C273/12 ,  Y02P20/142 ,  Y02P20/582

Abstract: Process and respective reactor for urea or melamine synthesis, comprising sonication treatment of at least part of a reaction liquid mass or two-phase mixture contained inside said reactor.

公开(公告)号：EP2688865B1

公开(公告)日：2017-05-03

申请号：EP12717060

申请日：2012-03-22

Applicant: CASALE SA

Inventor： SCHADT ARNE ,  NEUMÜLLER CHRISTOPH

IPC: C07C273/12

CPC classification number: C07C273/02 ,  C07C273/12 ,  Y02P20/125