METHOD FOR REMOVING NITROGEN OXIDE FROM GAS

• Main Authors: NEUMANN HARTMUT, WENNING ULRIKE
• Format: Patent
• Language: English
• Published: 19.01.1999
• Edition: 6
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a method for removing nitrogen oxide by which it is possible to prevent the negative action of nitrogen oxides such as the blockage of a flow passage in an extremely low temperature installation. SOLUTION: Nitrogen oxides are removed from a gas flow such as a charged air or a finished product flow or a mixed finished product flow or a process flow in an air separation installation by a chemical adsorption using metal oxides. The metal oxide is oxide of metal of subgroups VI-VIII, especially preferably manganese dioxide. Operating temperatures which are preferable for the chemical adsorption are 10-40 deg.C. The metal oxides can be regenerated by nitrogen at 130-170 deg.C, and can be used for a single piece or plural pieces of reactive filled layer which can be regenerated. This method is, for example, applicable to the manufacturing of a useful ultra-pure gas for the process to manufacture a semiconductor.