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Published: Kem. Ind. 56 (9) (2007) 441–448
Paper reference number: KUI-20/2006
Paper type: Professional paper
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Urea Synthesis Plant – Process Water Treatment

H. Lisac, L. Matijašević and I. Dejanović


After the years of operation of Petrokemija d. d. from Kutina it has been recognized that the technology of urea production can be improved at several points, including wastewater treatment. The wastewater treatment area is a part of the urea plant, Urea 2 of Petrokemija d. d., Kutina. The plant has been in operation since 1983 based on the licensed Stamicarbon CO2 stripping process. So far there have been no major process improvements in terms of utility savings. This part of the plant releases into the environment almost 800 t per day of superfluous wastewater polluted with small, however significant, amounts of urea and ammonium. As such, this wastewater cannot be used in any other segment of urea production. The aim of this paper is to improve the current process from the economical and ecological point of view with ultimate goal of implementing the results obtained. Using the CHEMCAD program, the wastewater treatment section of the UREA 2 plant at Petrokemija d. d. Kutina was simulated. Sensitivity analysis of the parameters which influence the concentrations of ammonia and urea in the stream leaving the water treatment section was performed.

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wastewater, urea plant, ChemCAD