Oxidative removal of cyanide from aqueous streams abetted by ultraviolet irradiation

Patent · Tue Aug 24 00:00:00 EDT 1993

OSTI ID:6030881

Frame, R R; Kalnes, T N; Moser, M D

A method is described of reducing the concentration of complexed cyanide in an aqueous stream containing at least one complexed cyanide which dissociates to afford less than 10% of the total cyanide present in the complexed cyanide as free cyanide ions. The method comprises the following: irradiating the aqueous stream with light of a wavelength effective to dissociate the complexed cyanide and afford free cyanide ions, and oxidizing the cyanide to carbon dioxide, nitrogen, and isocyanate with an oxidizing agent selected from the group consisting of oxygen ozone, and hydrogen peroxide in the presence of a catalytically effective amount of a metal chelate at oxidation conditions. The metal chelate is selected from the group consisting of metal compounds of tetrapyridinoporphyrazine, porphyrin, corrinoid materials, and the phthalocyanines.

• Assignee: UOP, Des Plaines, IL (United States)
• Patent Number(s): US 5238581; A
• Application Number: PPN: US 7-862149
• OSTI ID: 6030881
• Resource Relation: Patent File Date: 2 Apr 1992
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CYANIDES
OXIDATION
AQUEOUS SOLUTIONS
REMOVAL
ULTRAVIOLET RADIATION
CHEMICAL REACTIONS
DISPERSIONS
ELECTROMAGNETIC RADIATION
MIXTURES
RADIATIONS
SOLUTIONS
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
540220 - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)