The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 26, 1991
Filed:
Jun. 28, 1989
Maria Norell, Sundsvall, SE;
Eka Nobel AB, Surte, SE;
Abstract
The present invention relates to a process for production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, a mineral acid and methanol as a reducing agent in proportions to generate chlorine dioxide in a reaction medium maintained at a temperature from about 50.degree. C. to about 100.degree. C. and an acidity within the interval from a b out 2 to 4.8 N and subjected to a subatmospheric pressure sufficient to effect evaporation if water. A mixture of chlorine dioxide and water vapor is withdrawn from an evaporation region in the reaction vessel and an alkali metal salt of the mineral acid is precipitated in a crystallization region in the reaction vessel. The reaction is performed in the presence of a catalyst, which comprises a metal or a combination of two or more metals being selected from the group consisting of antimony, molybdenum, technetium, ruthenium, rhodium, palladium, rhenium, osmium, iridium, platina, or a combination of one or more of these with manganese or vanadium.