Patent · US Expired

Process and apparatus for purification of oxygen-containing gas

US6797127B1 · kind B1 · utility

10Cited by
2References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 4, 2002
Grant dateSep 28, 2004
Priority date
Expiry dateApr 4, 2022

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB01D2259/804
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

A method comprising a first step for radiating ultraviolet rays of a short wavelength of 110 nm or longer, but shorter than 200 nm to the gas, for example, an air to be treated to generate ozone, a second step for radiating ultraviolet rays of a medium wavelength of 200 nm or longer, but shorter than 300 nm to the air treated in the first step to form active oxygen, and a third step for radiating ultraviolet rays of a long wavelength of 300 nm or longer, but shorter than 380 nm to the air treated in the second step to convert the active oxygen into oxygen molecule in ground state, at least the second and/or third step being conducted in the presence of a photocatalyst comprising particles of titanium oxide of an orthorhombic crystal system or particles of titanium oxide of an orthorhombic crystal system supporting fine particles of another metal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.