- Nitrates and sulphate fertilizers
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Uhde offers its customers many years of expertise and experience in chemical plant engineering - from the execution of process studies to the handling of projects on an EPC basis.
Our portfolio includes state-of-the-art processes for the production of ammonium nitrate solution (AN) as feedstock for all types of AN processes such as the production of urea-ammonium nitrate solutions (UAN).
Uhde offers plants for the production of UAN with a capacity of up to 4,300 mtpd and is one of the leading licensors of these processes.
UAN is a mixture of ammonium nitrate, urea and water. Typical nitrogen concentrations of UAN are 28%, 30% or 32%. Depending on the customer's requirements, UAN can be enriched with soluble plant nutrients (sulfur, boron and calcium compounds).
Uhde offers two processes for the production of UAN:
a) neutralization of ammonia gas:
The required AN solution is generated in an upstream AN neutralization by reaction of ammonia gas and nitric acid. To adjust the required nitrogen content, a urea solution is mixed with water in a UAN mixing tank developed by Uhde.
b) Neutralisation of urea off-gas:
Uhde offers a CAPEX-optimized process that uses the ammonia-rich off-gas from an upstream, simplified urea synthesis to neutralize the ammonium nitrate. The low-concentration urea solution also derived from this urea synthesis is used to generate the UAN solution.
The Uhde® UAN processes are characterised by:
high product quality in accordance with international standards
high reliability and long operating times of the plants
references between 400 and 4,300 mtpd
maximum operational safety thanks to sophisticated process and control concepts
easy start-up and shut-down of the plant
cleaning of the exhaust gases of the neutralization with urea exhaust gas according to BAT level
All the above mentioned processes are referenced and proven worldwide.
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