Patent · US Active

Urea granulation process with scrubbing system

US9493407B2 · kind B2 · utility

0Cited by

5References

15Claims

0Family size

Assignee

UHDE FERTILIZER TECHNOLOGY B.V. · NL

Inventors

Matthias Potthoff · Dortmund, DE
Harald Franzrahe · Dortmund, DE
Luc Vanmarcke · Eeklo, BE

Key dates

Filing date	May 2, 2013
Grant date	Nov 15, 2016
Priority date	—
Expiry date	May 2, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02A50/20
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Disclosed is a method for producing granular urea and reducing ammonia emissions in a gaseous waste stream of the urea granulation process. The method includes the steps of granulating urea and generating a gaseous waste stream from the granulation of the urea, first washing the waste stream in a first scrubber dust stage to remove dust form the gaseous waste stream, and then reacting the gaseous waste stream with formaldehyde in a formaldehyde stage to generate a hexamethylenetetramine and urea-formaldehyde liquid stream, and an ammonia-reduced off-gas stream.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.