1966 Cook CCC 3232985 Urea Process

This invention written by Cook and Mavrovic again claims a more efficient method to recycle carbamate gas by means of a multi stage compressor. The recycle by means of a compressor is described already in US patent 1.429.483 and has found a commercial application in Germany (IG Fraben). This patent improves the power consumption by applying a heat exchange with water.


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