公开(公告)号：US20180370865A1

公开(公告)日：2018-12-27

申请号：US16062048

申请日：2016-12-17

Applicant: UHDE FERTILIZER TECHNOLOGY B.V. ,  thyssenkrupp AG

Inventor： Matthias POTTHOFF ,  Thomas KRAWCZYK ,  Harald FRANZRAHE ,  Luc Albert VANMARCKE

IPC: C05C9/00 ,  B01J2/16 ,  B01J2/02

Abstract: A particulate, urea-containing composition and use of an additive for producing a particulate, urea-containing composition and methods of producing a particulate, urea-containing composition.

公开(公告)号：US20160376230A1

公开(公告)日：2016-12-29

申请号：US15260018

申请日：2016-09-08

Applicant: UHDE FERTILIZER TECHNOLOGY B.V.

Inventor： Matthias POTTHOFF ,  Harald FRANZRAHE ,  Luc Albert VANMARCKE

IPC: C07C273/16 ,  B01J2/00 ,  B01D53/73 ,  B01D53/58 ,  B01D1/00

CPC classification number: C07C273/16 ,  B01D1/00 ,  B01D53/58 ,  B01D53/73 ,  B01D2258/02 ,  B01J2/00 ,  C05C9/005 ,  C05C9/02 ,  C07C273/02 ,  Y02A50/2346

Abstract: A urea granulation process with a scrubbing system may involve at least one gaseous waste stream for removal of dust and ammonia whereby the waste stream may be processed through a combination of process steps. In some examples, the process steps may involve washing the dust and ammonia laden stream with water and/or an aqueous urea solution whereby a dust-laden liquid stream and a dust-reduced stream is generated. The process steps may further involve reacting the dust-reduced stream with formaldehyde to form a stream comprising hexamethylenetetramine and urea-formaldehyde and clean off-gas. In some cases, the gas stream may be directed first through the washing step and then through the reacting step.

Abstract translation: 具有洗涤系统的尿素造粒方法可以包括用于去除灰尘和氨的至少一种气体废物流，由此可以通过工艺步骤的组合来处理废物流。 在一些实例中，工艺步骤可以包括用水和/或尿素水溶液洗涤灰尘和载氨的流，从而产生载有灰尘的液体流和减少灰尘的流。 工艺步骤还可以包括使减尘流与甲醛反应以形成包含六亚甲基四胺和脲甲醛的流和清洁废气。 在一些情况下，气流可以先通过洗涤步骤然后通过反应步骤。