公开(公告)号：US11993557B2

公开(公告)日：2024-05-28

申请号：US16982242

申请日：2019-03-20

Applicant: YARA INTERNATIONAL ASA

Inventor： Ruud Van Belzen ,  Howard Volke ,  Erika Winne

IPC: C07C273/02 ,  B01J8/06 ,  B01J19/24 ,  C01C1/242 ,  C07C275/02

CPC classification number: C07C273/02 ,  B01J8/06 ,  B01J19/242 ,  C01C1/242 ,  B01J2219/0004 ,  C07C275/02 ,  C05C3/00 ,  C05C9/00

Abstract: A method for the production of a urea ammonium sulphate (UAS) composition in a pipe reactor comprising at least a reactor section, the method comprising:



combining in the reactor continuous feeds of at least one of sulphuric acid and ammonium bisulphate, at least one of ammonia and ammonium carbamate, and urea; and
including a viscosity-reducing agent selected from water soluble aluminum salts in at least one of the continuous feeds, thereby forming the urea ammonium sulphate (UAS composition, wherein the UAS composition comprises 1 to 40 weight % of ammonium sulphate (AS) relative to the total weight of the UAS composition.

公开(公告)号：US11299435B2

公开(公告)日：2022-04-12

申请号：US16480442

申请日：2018-03-07

Applicant: Yara International ASA

Inventor： Filip Colpaert ,  Ruud Van Belzen

IPC: C05C9/00 ,  C05G3/90 ,  C05G5/30 ,  A23L29/00

Abstract: The invention relates to a solid, particulate, urea-based composition comprising urea in particulate form and a urease inhibitor of the type phosphoric triamide, in particular N-(n-butyl) thiophosphoric triamide (nBTPT), wherein the urea-based composition is further characterized in that it comprises one or more alkaline or alkaline-forming inorganic compounds. The composition according to the invention has been stabilized against the degradation of a urease inhibitor of the type phosphoric triamide, in particular N-(n-butyl) thiophosphoric triamide (nBTPT) in the presence of urea. The invention further relates to a method for the manufacture of the claimed solid, particulate, urea-based composition.