公开(公告)号：US3697521A

公开(公告)日：1972-10-10

申请号：US3697521D

申请日：1970-12-15

Applicant: STAMICARBON

Inventor： NASSAU PETRUS J M VAN ,  BRAND WILHELMUS K ,  KAASENBROOD PETRUS J C

IPC: C07D251/60 ,  C07C67/00 ,  C07C239/00 ,  C07C273/12 ,  C07D55/28

CPC classification number: C07C273/12 ,  Y02P20/125

Abstract: An integrated process for the preparation of urea and melamine is described wherein heat requirements for the decomposition of ammonium carbamate contained in the urea product solution, which is cycled as feed to the melamine synthesis stage, is supplied, at least in part, from the heat released by the desublimation of the melamine vapors obtained in the melamine synthesis gas product stream, by bringing this gas stream into direct contact, either in counter-current or co-current flow, with the ammonium carbamate-containing urea product solution.

Abstract translation: 描述了一种用于制备尿素和三聚氰胺的综合方法，其中包含在作为进料至三聚氰胺合成阶段的尿素产物溶液中的氨基甲酸铵分解的热需求至少部分地从热量 通过在三聚氰胺合成气产物流中获得的三聚氰胺蒸汽的释放，通过使该气流以逆流或并流流动与含氨基甲酸铵的尿素产物溶液直接接触释放。

公开(公告)号：US3674847A

公开(公告)日：1972-07-04

申请号：US3674847D

申请日：1969-03-17

Applicant: STAMICARBON

Inventor： KAASENBROOD PETRUS J C ,  NASSAU PETRUS J M VAN

IPC: C01C1/04 ,  C07C273/10 ,  C07C127/04

CPC classification number: C07C273/10 ,  C01C1/0488 ,  Y02P20/52

Abstract: A process for the production of urea from ammonia and carbon dioxide, combined with the preparation of ammonia, is disclosed wherein ammonium carbamate in the urea solution produced is removed from said urea solution by subjecting the urea solution to two stripping stages. The first stripping stage uses the urea synthesis starting gas, which contains hydrogen, nitrogen and carbon dioxide. The second stripping stage, which is at substantially the same pressure as the first stripping stage, uses a gas containing at least one of the components needed in the ammonia synthesis. This second stripping gas is substantially free of ammonia and carbon dioxide. The disclosed process has the advantage, compared to prior processes, that the stripping gases need not be compressed at relatively high temperatures.

Abstract translation: 公开了一种从氨和二氧化碳生产尿素以及氨的制备方法，其中通过使尿素溶液进行两个汽提阶段从所述尿素溶液中除去生成的尿素溶液中的氨基甲酸铵。 第一个汽提阶段使用含有氢气，氮气和二氧化碳的尿素合成起始气体。 与第一汽提阶段基本上相同的压力的第二汽提级使用包含氨合成中所需的至少一种组分的气体。 该第二汽提气体基本上不含氨和二氧化碳。 所公开的方法与现有技术相比具有在较高温度下不需要压缩汽提气体的优点。

公开(公告)号：US3682911A

公开(公告)日：1972-08-08

申请号：US3682911D

申请日：1969-02-03

Applicant: STAMICARBON

Inventor： KAASENBROOD PETRUS J C ,  NASSAU PETRUS J M VAN

IPC: B65D39/02 ,  C07D251/60 ,  C07D55/28

CPC classification number: C07D251/60 ,  B65D39/02 ,  Y02P20/125

Abstract: An integrated process for the manufacture of melamine in combination with the manufacture of urea is disclosed, wherein the urea product from the urea synthesis unit is used as feed to the melamine synthesis unit. In the process described, the ammonia and carbon dioxide by-products from the melamine plants are processed by condensing the same to form a dilute solution of ammonium carbamate and ammonia and desorbing the resulting solution at urea synthesis pressures, to release a major part of the carbon dioxide, and passing the resulting gaseous mixture containing ammonia and carbon dioxide with only small amounts of water vapor directly to the high pressure urea synthesis unit. Procedures for suitably recovering and using the heat energy released during the various chemical reactions and evaporation steps are also described.

Abstract translation: 公开了一种用于制造三聚氰胺与尿素制造的综合方法，其中来自尿素合成单元的尿素产物用作三聚氰胺合成单元的进料。 在所描述的方法中，来自三聚氰胺植物的氨和二氧化碳副产物通过将其缩合形成氨基甲酸铵和氨的稀溶液并在尿素合成压力下解吸所得溶液，以释放主要部分的 二氧化碳，并将含有氨和二氧化碳的所得气体混合物仅用少量水蒸气直接送至高压尿素合成装置。 还描述了适当回收和使用在各种化学反应和蒸发步骤期间释放的热能的方法。