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UREA FINISHING PROCESS WITH ACID SCRUBBING
专利权人:
CASALE S.A.
发明人:
SCOTTO, Andrea,BERTINI, Paolo
申请号:
EP20150756173
公开号:
EP3218355(B1)
申请日:
2015.08.31
申请国别(地区):
欧洲专利局
年份:
2018
代理人:
摘要:
A process for the finishing of urea comprising: (a) removing water from an aqueous urea solution in a first evaporation and condensation section, obtaining a urea melt; (b) subjecting said urea melt to a finishing treatment comprising granulation and resulting in solid urea and air contaminated with urea dust and ammonia; (c) subjecting said contaminated air to acid scrubbing, producing an aqueous solution comprising urea and ammonium salts; (d) subjecting at least part of said aqueous solution to evaporation in a second evaporation section, obtaining a liquid stream comprising urea and ammonium salts and a gaseous stream; (e) condensing said gaseous stream in a second condensation section, obtaining a recycle aqueous stream; (f) using at least a part of said recycle aqueous stream for the scrubbing of contaminated air; (g) converting at least a portion of said liquid stream comprising urea and ammonium salts into solid particles, and (h) using said solid particles as seeds for the granulation; a correspondin
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