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Process for production of chlorine dioxide

A technology of chlorine dioxide and chloric acid, which is applied in the direction of chlorine dioxide, chlorine oxide, chemical instruments and methods, etc., and can solve problems such as loss of chlorine dioxide, thermodynamic instability and high reactivity

Inactive Publication Date: 2012-07-04
AKZO NOBEL CHEM INT BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the inherent thermodynamic instability and high reactivity of chlorine dioxide, its storage in solution suffers from the risk of losing part of the chlorine dioxide due to chemical reactions

Method used

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  • Process for production of chlorine dioxide
  • Process for production of chlorine dioxide

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Experimental program
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Embodiment

[0037] Tested at 25 tons of ClO 2 / day at setpoints operating under steady conditions such as figure 1 performed in the experimental setup shown. The temperature of the physical water entering the absorber was 10°C and the temperature of the exiting product was 12°C. At the beginning of the test the generator concentration was 344g / dm 3 NaClO 3 , 313g / dm 3 h 2 SO 4 , 10 wt% crystal and 48% generator level. At the end of the test, the generator concentration was 296g / dm 3 NaClO 3 , 315g / dm 3 h 2 SO 4 , 10 wt% crystal and 48% generator level.

[0038] Three different stability tests were performed on the chlorine dioxide water sampled after the absorber.

[0039] Test 1 was carried out on the chlorine dioxide water obtained operating in conventional mode with the temperature in the condenser set at 38°C. Therefore, the condensate is not withdrawn, but sent to an absorber, where it is admixed with chlorine dioxide water.

[0040] Test 2 was carried out on the c...

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Abstract

The present invention relates to aprocess for productionof chlorine dioxide comprising: reacting in an acidic reaction mediumin a reaction vessel an alkali metal chlorate or chloric acid and methanol to generate chlorine dioxide,withdrawingfrom the reaction vessel a gas comprising chlorine dioxideand gaseous by-products,condensing part of the gas withdrawn to obtain a condensate; and removing thecondensate from the non- condensed gas without re-circulating it back to the process for production of chlorine dioxide.

Description

technical field [0001] The present invention relates to a process for the production of storable chlorine dioxide with low by-products, the process comprising reacting an alkali metal chlorate or chloric acid and methanol in an acidic reaction medium in a reaction vessel to produce chlorine dioxide . Background of the invention [0002] There are many different methods of producing chlorine dioxide. Most large-scale commercial processes are carried out at pulp mills and involve the continuous reaction of an alkali metal chlorate in an acidic reaction medium with a reducing agent such as hydrogen peroxide, methanol, chloride ions or sulfur dioxide to form chlorine dioxide which The gas is withdrawn from the reaction medium and subsequently absorbed in water, which is sent to a storage tank. A review of this method can be found in Ullmann's Encyclopedia of Industrial Chemistry, Chlorine Oxides and Chlorine Oxygen Acids, DOI: 10.1002 / 14356007.a06_483.pub2, article published o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/02
CPCC01B11/023C01B11/022B01D3/36B01D46/54B01J19/24
Inventor A·达尔K·H·T·佩林
Owner AKZO NOBEL CHEM INT BV
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