TH11506B - Chlorine Dioxide Production Method - Google Patents

Abstract

DC60 (14/08/44) An invention of the process of producing chlorine dioxide by the reduction of chlorate ions with a reducing agent hydrogen peroxide. In a pipe reactor By choosing to stay In the presence of mineral acids Where the degree of chlorate to chlorine dioxide changes in the reactor Better is approximately 75% superior, usually from approximately 80 to 100%. Fabrication involves a process of producing chlorine dioxide by the reduction of chlorate ions with redirected hydrogen peroxide. Racing In a pipe device By choosing to stay In mineral acids Where the degree of chlorate to chlorine dioxide changes in the reactor Better is approximately 75% superior, often from approximately 80 to 100%.

Claims (16)

1. The process of producing chlorine dioxide by reduction of chlorate ions with hydrogen peroxide as a reducing agent in the presence of mineral acid or chloric acid within a tubular reactor consists of the following steps: (a) feeding hydrogen peroxide, metal chlorates and mineral acid or chloric acid, or a mixture of these, into one end of the tubular reactor to create a reaction mixture where the molar ratio of H2O2 : ClO3- in the feed is between 0.5 : 1 and 2:1; (b) reducing chlorate ions in the reaction mixture in the said tubular reactor to produce chlorine dioxide; and (c) removing the chlorine dioxide-containing product from the other end of the said tubular reactor. 3. The process entitled under claim 1, whereby step (a) involves feeding metal chlorate and mineral acid. 3. A process that fulfills claim 1 without recirculating chlorates or non-reactive mineral acids. 4. The process as enshrined in claim 1, with the inner diameter of the tubular reactor ranging from 25 to 250 millimeters. 5. A process that qualifies under claim 1 where the tubular reactor has an internal length-to-diameter ratio from less than 12:1 to 1:1. 6. The process entitled to claim I, where the pressure in the reactor is between 125 and 900 millimeters of mercury. 7. The procedure claimed under claim 1, whereby the reaction mixture within the reactor volume contains 0 to 2 moles per liter of chlorate ions and 3 to 10 moles per liter of sulfuric acid. 8. The procedure entitled under claim 7, whereby the reaction mixture within the reactor volume contains chlorate ions ranging from 0 to 0.1 mol/L. 9. The process entitled under claim 1, performed without any significant gradient concentrations in the tubular reactor. 10. The process that qualifies under claim 2, where metal chlorate is an alkali metal chlorate. 11. The process for which the right to claim under claim 2 is acquired, where the mineral acid is sulfuric acid. 12. A process that encompasses the rights under claim 11 by feeding 3 to 5 kg of H2SO4 per kg of constructed ClO2. 13. The process entitled under claim 12 involves the input of sulfuric acid at a temperature ranging from 20 to 50 degrees Celsius. 14. A process that qualifies under claim 1, where the molar ratio of H2O : ClO3- in the feed is between 0.5:1 and 1:1. 15. The process for producing chlorine dioxide by reducing chlorate ions with hydrogen peroxide as a reducing agent in the presence of sulfuric acid in a tubular reactor consists of the following steps: (a) feeding hydrogen peroxide, metal chlorates, and sulfuric acid at one end of the tubular reactor to create a reaction mixture where the molar ratio of H2O2:ClO3- is from 0.5:1 to 2:1 and where the sulfuric acid feed concentration is from 70 to 96% by weight; (b) reducing chlorate ions in the reaction mixture in the said tubular reactor to produce chlorine dioxide; and (c) removing the product containing chlorine dioxide at the other end of the tubular reactor, where a feed of H2SO4 of 2 to 10 kg of the produced ClO2 is present. 16. The procedure for which the right under claim 1 is claimed, where the amount of chloride in step (a) is less than 0.5% by weight calculated as NaCl in NaClO3.