Chemistry of inorganic compounds – Halogen or compound thereof – Chlorine dioxide
Patent
1977-03-21
1978-08-08
Hearn, Brian
Chemistry of inorganic compounds
Halogen or compound thereof
Chlorine dioxide
423479, 423480, 23260, 23282, C01B 1102
Patent
active
041057511
ABSTRACT:
Chlorine dioxide is manufactured by reducing an alkali metal chlorate in an acid medium by means of a gaseous or liquid reducing agent in at least one production reactor, with recycling of the tail gases to the said reactor, in order to dilute the chloride dioxide produced. In the new process, the tail gases to be recycled are brought into contact with an excess of reducing agent and a sufficient amount of water to reduce virtually all of the chlorine contained in these tail gases to hydrochloric acid, and thereafter the mixture thus obtained, of tail gases after reduction, and of reducing agent, is recycled, at least partly, to the said reactor. In this way, a large amount of chloride ions, which are immediately available for the basic reaction of production of chlorine dioxide, is introduced at the same time as the neutral gases required for dilution.
REFERENCES:
patent: 2481241 (1949-09-01), Rapson et al.
patent: 2704703 (1955-03-01), Hesson
patent: 2881052 (1959-04-01), Julien et al.
patent: 3322497 (1967-05-01), Martin
patent: 3806320 (1974-04-01), Erlenbach et al.
patent: 3816077 (1974-06-01), Fuller
patent: 3896213 (1975-07-01), Hirdler
Hearn Brian
Societe d'Etudes Chimiques
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