Preparation technology of 3-15t/d large solid sodium chlorite

A sodium chlorite and preparation technology, applied in the direction of chlorous acid, etc., can solve the problems of safety and environmental protection hazards, poor control of production indicators, and low production capacity of a single production line, so as to save manpower, improve the effect of reducing agents, The effect of improving stability

Active Publication Date: 2015-09-30
SHANDONG SHANDA WIT ENVIRONMENTAL ENGINEERING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The whole production process is intermittent production, and the production capacity of a single production line is low, generally 1-2 tons per day, and th

Method used

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  • Preparation technology of 3-15t/d large solid sodium chlorite

Examples

Experimental program
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Example Embodiment

[0039] Example 1:

[0040] First, add sodium chlorate (with a concentration of 600g / l) to the reactor 1# chamber, and add sulfuric acid (mass fraction 93%) to the reactor 1# and 2# chambers in two ways. Hydrogen peroxide (mass fraction 35%) ) It is added into the 1#, 2#, and 3# chambers in three ways, the reaction temperature is controlled at 50°C, and the reaction pressure is controlled at 97Kpa to produce mixed gas of chlorine dioxide and air.

[0041] Secondly, in the absorption tower, the mixture of sodium hydroxide (mass fraction 32%) and hydrogen peroxide (mass fraction 27.5%) is used to absorb the mixed gas of chlorine dioxide and air, and the absorption temperature is controlled at 20°C. The finished solution of sodium chlorite is obtained.

[0042] Finally, sodium chloride is added to the finished sodium chlorite solution (the amount added is 0.25 times the mass of sodium chlorite in the liquid), and the mixed solution of sodium chlorite and sodium chloride is evaporated, c...

Example Embodiment

[0043] Example 2:

[0044] First, add sodium chlorate (with a concentration of 500g / l) into reactor 1# chamber, and add sulfuric acid (mass fraction 98%) to reactor 1# and 2# chambers in two ways, and methanol (mass fraction 20%) Three channels are added to the 1#, 2#, and 3# rooms, the reaction temperature is controlled at 65°C, and the reaction pressure is controlled at 96Kpa to produce mixed gas of chlorine dioxide and air.

[0045] Secondly, in the absorption tower, the mixture of potassium hydroxide (mass fraction 30%) and hydrogen peroxide (mass fraction 27.5%) is used to absorb the mixed gas of chlorine dioxide and air, and the absorption temperature is controlled at 10°C. The finished solution of sodium chlorite is obtained.

[0046] Finally, sodium chloride is added to the finished sodium chlorite solution (the added amount is 0.2 times the mass of sodium chlorite in the liquid), and the mixed solution of sodium chlorite and sodium chloride is evaporated, crystallized, filt...

Example Embodiment

[0047] Example 3

[0048] A 3-15t / d large solid sodium chlorite preparation process,

[0049] 1) Add sulfuric acid, hydrogen peroxide and sodium chlorate solution into the chlorine dioxide reactor, and react to produce a mixed gas of chlorine dioxide and air under the conditions of temperature 45℃ and pressure 95KPa(A);

[0050] The above steps are completed in four steps:

[0051] a) Add 100% theoretical mass of sodium chlorate (with a concentration of 500g / l), 50% theoretical mass of sulfuric acid (mass fraction 98%), and 40% theoretical mass of hydrogen peroxide into the reactor. The reaction time is 4 hours. Control the degree of response to 40%;

[0052] b) Add 50% of the theoretical mass of sulfuric acid to the reactor to maintain the acidity of the reaction, while adding 40% of the theoretical mass of hydrogen peroxide, the reaction time is 2 hours, and the reaction degree is controlled to 80%;

[0053] c) Add 20% hydrogen peroxide to the reactor for a reaction time of 2 hours to...

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Abstract

The invention discloses a preparation technology of 3-15t/d large solid sodium chlorite. The preparation technology comprises the following steps: 1), adding sulfuric acid, a reducing agent and a sodium chlorate solution to a chlorine dioxide reactor to react with one another to form mixed gas of chlorine dioxide and air at the temperature of 45-65 DEG C, at the pressure of 95-101 KPa under the (A) condition; 2), adding caustic soda liquid and the reducing agent to an absorption system to absorb chlorine dioxide gas produced in the step (1) at the temperature of 5-35 DEG C, at the pressure of 95-101 KPa under the (A) condition to prepare 20%-40% sodium chlorite solution; 3), adding sodium chloride to the solution produced in the step (2) according to the mass ratio of sodium chloride to sodium chlorite being 0.15-0.25:1, evaporating, crystallizing, filtering and drying sodium chlorite and sodium chloride mixed solution to obtain the sodium chlorite finished product. The content of chlorine gas in tail gas is reduced to be lower than 3 mg/Nm<3> by the absorption system by changing the addition points of caustic soda liquid and the reducing agent, so that the environmental requirements can be met. Acid is added in a ladder-like manner, the reaction intensity can be controlled under the condition that the reaction acidity is ensured, the reaction safety is ensured and the reaction efficiency is improved.

Description

technical field [0001] The invention relates to a new process for preparing large-scale solid sodium chlorite, in particular to a process for preparing 3-15t / d large-scale solid sodium chlorite. Background technique [0002] Sodium chlorite is a high-efficiency bleaching agent with a wide range of applications, such as cotton spinning, flax, paper making, food disinfection and other fields. The market demand is large, but its production technology is backward and its safety is poor. Therefore, the current production technology is mostly intermittent production and cannot operate continuously. [0003] At present, the most widely used method in the market is the reduction method to produce sodium chlorite. This method mainly includes chlorine dioxide generation system, absorption system, evaporation crystallization system, filtration system and drying system. [0004] Main process: The chlorine dioxide generation system is a series of enamel tank reactors, which react with s...

Claims

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Application Information

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IPC IPC(8): C01B11/10
Inventor 孟庆海程燕田禾王炳福吕世鹏张斌黎明忠王国安王志法
Owner SHANDONG SHANDA WIT ENVIRONMENTAL ENGINEERING CO LTD
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