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：US3607939A

公开(公告)日：1971-09-21

申请号：US3607939D

申请日：1968-12-23

Applicant: STAMICARBON

Inventor： KAASENBROOD PETRUS J C ,  TAKS GERARDUS J J M

IPC: C07C273/10 ,  C07C127/00

CPC classification number: C07C273/10

Abstract: A process for the manufacture of urea from ammonia and carbon dioxide is described with particular reference to procedures in handling the ammonia feed to the urea reactor whereby the volume of inert gases in said reactor is reduced without need for condensation and liquefication of the ammonia synthesis gas. The technique described involves absorbing the ammonia from the ammonia synthesis gas mixture (containing ammonia, hydrogen and nitrogen) in water, a dilute aqueous solution of urea, or a dilute aqueous solution of ammonia and carbon dioxide at a relatively high pressure (250 atm. or more) and then delivering the absorbed ammonia solution to the urea plant-this technique being practiced so that only a relatively small amount of additional water (over and above that autogenously formed in the urea reaction itself) is introduced into the urea reactor.

公开(公告)号：US3185731A

公开(公告)日：1965-05-25

申请号：US23159362

申请日：1962-10-18

Applicant: STAMICARBON

Inventor： KAASENBROOD PETRUS J C

IPC: C07C273/16

CPC classification number: C07C273/16

公开(公告)号：US3184508A

公开(公告)日：1965-05-18

申请号：US23159262

申请日：1962-10-18

Applicant: STAMICARBON

Inventor： KAASENBROOD PETRUS J C

IPC: C07C273/16

CPC classification number: C07C273/16