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June 12, 2013

Koch Nitrogen selects Stamicarbon’s urea technology its expansion in Enid

Gerald Ondrey

Stamicarbon B.V. (Sittard, The Netherlands;, the Licensing and IP Center of Maire Tecnimont S.p.A. (, has received two orders from Koch Nitrogen Co. (KNC) for a grass-roots urea melt and granulation plant in Enid, Oklahoma. The first of these orders covers the licensing, process design packages (PDPs) and associated services for the urea melt and granulation plant; the second for the supply of the proprietary high-pressure equipment and a sophisticated acid scrubbing unit for recovering ammonia as a valuable product from plant off-gases. The KNC facility in Enid is one of the largest fertilizer production plants in North America, producing ammonia, UAN and granular urea.

The urea melt plant will be built next to KNC’s existing Enid urea plant and will be integrated to some extent with it. The new urea synthesis plant will have a capacity of 2,200 metric tons (m.t.) per day), based on Stamicarbon’s Urea2000Plus Pool Reactor technology, and will have a medium pressure adiabatic flash separator. It will also produce a high-purity urea solution — called Diesel Exhaust Fluid (DEF) — that will be used to improve the environmental performance of diesel engines by reducing the nitrogen oxides in the exhaust gases.

The fluid-bed urea granulation plant has a capacity of 2,676 m.t./d of granular urea. Two reasons why KNC awarded Stamicarbon this part of the project are Stamicarbon’s outstanding reputation and the inclusion of sophisticated proprietary urea dust and ammonia acid scrubbing equipment (an exclusive feature of Stamicarbon granulation plants), thanks to which the new plants will be able to meet the stringent emission values required by EPA and the local authorities, says Stamicarbon.

Larger-than-usual evaporation and hydrolysis units will be provided to accommodate some urea solution from the existing urea plant.

Besides providing the licenses and PDPs for the urea melt and granulation plants, Stamicarbon will also directly supply the proprietary state-of-the-art scrubber and proprietary high-pressure equipment in Safurex stainless steel. Safurex is said to be the leading corrosion-resistant construction material for high-pressure urea equipment.

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