(EP925107-A1)      Shift converter for reducing the amount of carbon monoxide in a process gas has a chamber, and an outlet for exit of a low temperature effluent from the chamber. The outlet is disposed downstream of the inlet.    The shift converter comprises:    (a) an adiabatic catalytic reaction zone having shift converter catalyst disposed therein for exothermally converting a major portion of the carbon monoxide in the process gas into carbon dioxide and hydrogen, thereby producing a high temperature effluent; and    (b) an actively-cooled catalytic reaction zone positioned downstream from the adiabatic catalytic reaction zone for cooling the high temperature effluent and for creating the low temperature effluent, the actively cooled zone having a shift converter catalyst disposed therein for converting a minor portion of the carbon monoxide remaining within the high temperature effluent into carbon dioxide and hydrogen, and the actively-cooled zone including a heat exchanger utilising a pressurised liquid coolant stream which enters the activated cooled zone as a single-phase liquid coolant, and is converted in the actively-cooled zone to a two-phase liquid-gas coolant without a significant temperature increase due to boiling of the single phase liquid coolant in the actively cooled zone.    Also claimed is a method for lowering the percentage of carbon monoxide in a process gas stream by means of an exothermic shift conversion reaction.    USE -   Compact and efficient shift converter with desired process gas stream.    ADVANTAGE -   Shift converter has chosen carbon monoxide levels and temperatures. Its active zone is cooled by boiling pressurised water so that the temperature of the actively-cooled zone is not raised significantly.    (JP2000511104-W)      Shift converter for reducing the amount of carbon monoxide in a process gas has a chamber, and an outlet for exit of a low temperature effluent from the chamber. The outlet is disposed downstream of the inlet.    The shift converter comprises:    (a) an adiabatic catalytic reaction zone having shift converter catalyst disposed therein for exothermally converting a major portion of the carbon monoxide in the process gas into carbon dioxide and hydrogen, thereby producing a high temperature effluent; and    (b) an actively-cooled catalytic reaction zone positioned downstream from the adiabatic catalytic reaction zone for cooling the high temperature effluent and for creating the low temperature effluent, the actively cooled zone having a shift converter catalyst disposed therein for converting a minor portion of the carbon monoxide remaining within the high temperature effluent into carbon dioxide and hydrogen, and the actively-cooled zone including a heat exchanger utilising a pressurised liquid coolant stream which enters the activated cooled zone as a single-phase liquid coolant, and is converted in the actively-cooled zone to a two-phase liquid-gas coolant without a significant temperature increase due to boiling of the single phase liquid coolant in the actively cooled zone.    Also claimed is a method for lowering the percentage of carbon monoxide in a process gas stream by means of an exothermic shift conversion reaction.    USE -   Compact and efficient shift converter with desired process gas stream.    ADVANTAGE -   Shift converter has chosen carbon monoxide levels and temperatures. Its active zone is cooled by boiling pressurised water so that the temperature of the actively-cooled zone is not raised significantly.