Patent ID: 9745256
Date: 2017-08-29
CPC Classifications: B01D,B01J,C05C,C07C,Y02A

Claim:
1. A urea granulation system comprising: a urea granulator configured to generate granulated urea product and a first dust and ammonia-laden gaseous waste stream; a first scrubber dust stage disposed downstream of, and in communication with, said urea granulator along a flow path of the first gaseous waste stream, said scrubber dust stage being configured to remove dust from the first dust and ammonia-laden gaseous waste stream, and convey the first gaseous waste stream downstream for further processing; and a formaldehyde stage disposed downstream of, and in communication with, said scrubber dust stage along a flow path of the first gaseous waste stream, said formaldehyde stage being configured to receive the first gaseous waste stream and react a portion of the ammonia contained in the first gaseous waste stream with formaldehyde, so as to form hexamethylenetetramine.