Patent ID: 7371313
Filing Date: 2008-05-13
Classification: B01D,C01C,C01P

Abstract:
1. A method for on-site generation and purification of ultra-pure ammonia, comprising: generating ammonia in a reactor to produce a first effluent comprising ammonia and impurities; processing the first effluent with an absorption apparatus fluidly connected to the reactor to produce a bottom fraction comprising ammonia, water, minor amounts of carbon dioxide and trace levels of impurities; processing the absorption apparatus bottom fraction with a first distillation apparatus fluidly connected to the absorption apparatus to produce an overhead fraction comprising ammonia having minor amounts of water and trace levels of impurities; flowing the overhead fraction from the first distillation apparatus through a first purification system containing a first purifier material and fluidly connected to said first distillation apparatus to produce a second effluent comprising ammonia having less than about 10,000 ppm water, minor amounts of carbon dioxide, and trace levels of impurities; flowing the second effluent through a second purification system containing a second purifier material and fluidly connected to the first purification system to produce a third effluent comprising ammonia having less than about 10,000 ppm water, minor amounts of carbon dioxide, and trace levels of impurities; processing the third effluent with a second distillation apparatus fluidly connected to the second purification system to produce a bottom fraction comprising ammonia having less than about 10,000 ppm water, less than about 40 ppm carbon dioxide, and less than about 200 ppm other impurities; flowing the bottom fraction from the second distillation apparatus through a third purification system containing a third purifier material and fluidly connected to the third distillation apparatus to provide a fourth effluent comprising ammonia having less than about 10,000 ppm water, less than about 40 ppm carbon dioxide and less than about 200 ppm other impurities; and flowing the fourth effluent through a fourth purification system containing a fourth purifier material and fluidly connected to the third purification system to produce ultra-pure ammonia having less than about 10,000 ppm water, less than about 40 ppm carbon dioxide, and less than about 200 ppm other impurities; and flowing the fourth effluent through a fourth purification system containing a fourth purifier material and fluidly connected to the third purification system to produce ultra-pure ammonia having less than about 10,000 ppm water, less than about 40 ppm carbon dioxide, and less than about 200 ppm other impurities.