Method for reducing aerosol emissions in a urea granulation...

Details Method for reducing aerosol emissions in a urea granulation... Method for reducing aerosol emissions in a urea granulation...

2009-05-04

2011-12-20

Sullivan, Peter O (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C564S073000, C071S028000, C071S064030

Reexamination Certificate

active

08080687

ABSTRACT:
The invention relates to a process for the granulation of a concentrated urea solution whereas the granulation produces a urea granulate and a dust laden air, which is then fed into a dust scrubber which removes the coarser dust with a less concentrated urea solution and which releases a residual air comprising air with ammonia, carbon dioxide water and an aerosol comprising mainly ammonium isocyanate and a part of very fine urea sublimate, whereas the aerosol is then separated off and fed into a isomerisation unit which comprises a stripping where the ammonium isocyanate reacts with steam to form urea which is then redirected into the dust scrubber as a less concentrated urea solution, and the residual air is directed into an acidic scrubber which releases clean air into the atmosphere which finally leads to a recycling of the aerosol of ammonium isocyanate into urea. The invention also relates to a device for carrying out the related process.

REFERENCES:
patent: 7682425 (2010-03-01), Niehues et al.
patent: 7753985 (2010-07-01), Leopold
patent: 197 31 505 (1998-01-01), None
patent: 2 315 435 (1998-02-01), None
patent: WO 2005/032696 (2005-04-01), None
patent: WO 2005/075383 (2005-08-01), None

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