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  • NIIK - 65 Years On the Cutting Edge of Success

    NIIK - 65 Years On the Cutting Edge of Success

  • BHDT - Excellence in High Pressure

    BHDT - Excellence in High Pressure

  • LESER, The Safety-Valve.com

    LESER, The Safety-Valve.com

  • VECOM: Global Expert in Chemical Cleaning

    VECOM: Global Expert in Chemical Cleaning

My UreaKnowHow


UreaKnowHow.com: 6500+
UreaKnowHow.com & UreaNet.cn: 12500+
AmmoniaKnowHow.com: 800+
Round Tables:
Topics: 1800+
Posts: 9100+
Average posts per topic: 5+
Average posts per day: 2-3
Technical Papers: 1040+
Photos: 1150+
Videos: 190+
Safety & Reliability Risks Collected:
Urea: 200+ 
Ammonia: 1200+
Revamp Guides: 
High Efficiency Trays
Ammonia Emissions

Safety Information

- Incidents in Urea Plants: 120
- Safety Risks in Urea Plants: 200
- Urea Reactor Safety Risks: 50
- Ammonia Feed Piping Risks: 10
- Risks during Turnarounds: 10
For our complete overview of Safety Risks, Incidents and Near Misses, check out FIORDA

This invention is written together with patent 2933526 which describes a process which consists of a vacuum evaporation stage, a cooling phase with air until nearly the crystallization temperature and that a further cooling against urea fines leading to a free flowing product with a crushing strength of 30 kg/cm2, a biuret figure lower than 2 wt% and a low moisture content of 0.1-0.2 wt%.
A further improvement to reduce the biuret content is described in this patent, which is accomplished by maintaining a gaseous phase of ammonia in the vacuum evaporation  stage and cooling phase. The biuret figure reduces then to 1 wt%.