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Process for the production of chlorine dioxide

A chlorine dioxide and alkali metal chlorate technology, applied in the direction of chlorine dioxide, chlorine oxide, etc., can solve problems such as complex equipment

Inactive Publication Date: 2012-08-22
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this scheme requires additional steps, making the device more complex

Method used

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

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Embodiment Construction

[0022] In this patent application, the term "pump" refers to the explosive decomposition of chlorine dioxide into oxygen and chlorine during chlorine dioxide production. This phenomenon can be caused by impurities in the reaction mixture or by excessively high local temperatures ("hot spots").

[0023] The term "reaction mixture" refers to a mixture comprising an alkali metal chlorate, water, sulfuric acid and a reducing agent. Typically, the reaction mixture also contains chlorine dioxide and an alkali metal salt. Chlorine dioxide and alkali metal salts produced as by-products are removed from the reaction mixture. At a minimum, an aqueous alkali metal chlorate solution, sulfuric acid and reducing agent are fed to the remaining reaction mixture. Thus, the composition of the reaction mixture varies in the different process steps.

[0024] The invention relates to a process for the production of chlorine dioxide by means of a plant comprising a reaction vessel 1 operating un...

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Abstract

The invention relates to a process for the production of chlorine dioxide. Specifically, the invention relates to a process for the production of chlorine dioxide, by which sulphuric acid can be efficiently mixed into the reaction mixture. The process apparatus comprises a reaction vessel (1) operating in reduced pressure, in which alkali metal chlorate is reduced in acidic conditions. The reaction vessel (1) is equipped with a recirculation line (2) of the reaction mixture, comprising a circulation pump (3) and, downstream after the pump, a heat exchanger (4). The process is characterized in that the sulphuric acid is fed into the recirculation line (2) before the said circulation pump, or into the circulation pump (3).

Description

technical field [0001] The present invention relates to a method for producing chlorine dioxide. In particular, the present invention relates to the efficient mixing of sulfuric acid into a reaction mixture to produce chlorine dioxide. Background technique [0002] Chlorine dioxide (ClO 2 ) is an important pulp bleaching chemical. It is also used for many other purposes such as water purification. Chlorine dioxide is typically produced by reducing sodium chlorate (or other alkali metal chlorate) under acidic conditions and collecting the resulting gaseous chlorine dioxide from the reaction mixture. Typically, sulfuric acid is used as the acid. Reducing agents may include, for example, hydrogen peroxide, methanol, chloride ions, or sulfur dioxide. Chlorine dioxide is often produced in pulp mills. [0003] Chlorine dioxide can be produced by a number of different methods. All methods for the preparation of chlorine dioxide include at least the following steps in terms o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/02
CPCC01B11/023
Inventor 塞波·波赫扬韦希
Owner KEMIRA OY
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