公开(公告)号：US20240092730A1

公开(公告)日：2024-03-21

申请号：US18248902

申请日：2022-12-19

Applicant: STAMICARBON B.V.

Inventor： Johan Albert Arno VAN DEN TILLAART ,  Eelco MOSTERT

IPC: B01D5/00 ,  C07C273/04

CPC classification number: B01D5/0012 ,  C07C273/04

Abstract: The disclosure pertains to a urea plant and process of the thermal stripping type as well as to a method of modifying a urea plant of the thermal stripping type. Provided is a urea plant with a thermal stripper and a high pressure carbamate condenser with a shell space wherein gas from the stripper is condensed in the shell space.

公开(公告)号：US20200095196A1

公开(公告)日：2020-03-26

申请号：US16698734

申请日：2019-11-27

Applicant: STAMICARBON B.V.

Inventor： Eelco MOSTERT

IPC: C07C273/04 ,  B01D53/58 ,  C07C273/16 ,  B01J4/00

Abstract: Disclosed is a novel method of controlling the formation of biuret in urea production, and particularly reducing, preventing or reversing such formation. This is accomplished by adding liquid ammonia to a urea aqueous stream. This addition is done at one or more positions downstream of a recovery section in a urea plant. The addition of liquid ammonia serves to shift the equilibrium of biuret formation from urea, to the side of the formation of urea from biuret and ammonia. The invention can be accomplished also in pre-existing urea plant, by the simple measure of providing an appropriate inlet for liquid ammonia, in fluid communication with a source of such liquid ammonia.

公开(公告)号：US20190194127A1

公开(公告)日：2019-06-27

申请号：US16098837

申请日：2017-04-28

Applicant: STAMICARBON B.V.

Inventor： Eelco MOSTERT

IPC: C07C273/04 ,  C07C273/16 ,  B01D53/58 ,  B01J4/00

Abstract: Disclosed is a novel method of controlling the formation of biuret in urea production, and particularly reducing, preventing or reversing such formation. This is accomplished by adding liquid ammonia to a urea aqueous stream. This addition is done at one or more positions downstream of a recovery section in a urea plant. The addition of liquid ammonia serves to shift the equilibrium of biuret formation from urea, to the side of the formation of urea from biuret and ammonia. The invention can be accomplished also in pre-existing urea plant, by the simple measure of providing an appropriate inlet for liquid ammonia, in fluid communication with a source of such liquid ammonia.

公开(公告)号：US20240059623A1

公开(公告)日：2024-02-22

申请号：US18256554

申请日：2023-02-14

Applicant: STAMICARBON B.V.

Inventor： Johan Albert Arno VAN DEN TILLAART ,  Eelco MOSTERT

IPC: C05C9/00 ,  C05G5/23 ,  C07C273/04 ,  C07C273/16

CPC classification number: C05C9/00 ,  C05G5/23 ,  C07C273/04 ,  C07C273/16

Abstract: A urea plant and urea production process of the stripping type are provided that are adapted for making Diesel Exhaust Fluid (DEF) or precursor thereof in a DEF production unit downstream of a treatment section. The treatment section receives a part of the urea synthesis stream from a reaction zone, in particular bypassing the HP stripper.

公开(公告)号：US20190210963A1

公开(公告)日：2019-07-11

申请号：US15735153

申请日：2017-04-28

Applicant: STAMICARBON B.V.

Inventor： Eelco MOSTERT

IPC: C07C273/04 ,  C07C273/16

CPC classification number: C07C273/04 ,  B01B1/005 ,  C07C273/16 ,  Y02P20/582

Abstract: Disclosed is a novel method of controlling the formation of biuret in urea production. This is accomplished by reducing or preventing the formation of biuret in a concentration section, particularly in one or more concentrators or evaporators. The method comprises controlling the residence time of a urea aqueous stream treated in such concentration section in a manner independently of the volume flow per time interval of said stream into said concentration section. The residence time can be controlled, e.g., by providing the concentration section with an adjustable volume or by adding a gas to the urea stream to be treated. A combination of such measures can also be applied.