Cement Energy and Environment

... Water t To vent -,. CO, to urea I reactor CO, -Ji·ee gases co, Scrubber CO, fTOm 1-----. r- ... CO, Stripper raw mill Absorber 0.5 kg/em' gases I+ MEA+CO, 120°C 20 kg/em ' 60"C r-+ + CO, -rich MEA Wash water CO, -lean MEA to process .... .... Oxygen ~ I ... H, to ammonia converter Reverse Syn Gas osmosis 4 Converter f-- • plant Elexrolysis 300 kg/em' Water ... 480°C NHJ to urea reactor > Liquid oxgen Nitrogen ......_ ' Air Air liquefaction co, Urea Primary Secondary Urea .. ~ ,_ ... f-- De- f-- De- f-- Prilling r-- Bagging reactor composer composer .. .. NH, I I Carbonate recycle Fig. 1 Flow diagram for urea manufacture from waste C0 1 from cement manufacture