Patent · US Active

Urea granulation process with scrubbing system

US9745256B2 · kind B2 · utility

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4References

4Claims

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Assignee

UHDE FERTILIZER TECHNOLOGY B.V. · NL

Inventors

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

Key dates

Filing date	Sep 8, 2016
Grant date	Aug 29, 2017
Priority date	—
Expiry date	Sep 8, 2036

Classification

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

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.

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