公开(公告)号：US20170349542A1

公开(公告)日：2017-12-07

申请号：US15685308

申请日：2017-08-24

Applicant: Stamicarbon B.V.

Inventor： Johannes Henricus MENNEN ,  Barbara CUCCHIELLA

IPC: C07C273/04 ,  B01J19/24

CPC classification number: C07C273/04 ,  B01J19/24

Abstract: Disclosed is a method for the production of urea allowing a substantial reduction, even down to zero, of the continuous emission of ammonia conventionally resulting from such a process. According to a preferred embodiment of the invention, the urea-forming reaction from carbon dioxide and ammonia is conducted in a synthesis section that does not require passivation by oxygen. As a result of the absence of oxygen, a hydrogen-rich gas stream results from the synthesis section, that can be used as a fuel in an incinerator. In the incinerator, ammonia-comprising gas streams from the urea production process are combusted.

公开(公告)号：US20160318883A1

公开(公告)日：2016-11-03

申请号：US15106140

申请日：2014-12-16

Applicant: STAMICARBON B.V.

Inventor： Johannes Henricus MENNEN

IPC: C07D251/60 ,  B01J19/24

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流。 对该料流进行处理，优选包括汽提，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废气冷凝物。