A preparation process of 3-15t/d large-scale solid sodium chlorite

A sodium chlorite and preparation process technology, applied in chlorous acid and other directions, can solve the problems of hidden safety and environmental protection, poor control of production indicators, low production capacity of a single production line, etc., to save manpower, improve the effect of reducing agent, The effect of improving stability

Active Publication Date: 2017-03-01
SHANDONG SHANDA WIT ENVIRONMENTAL ENGINEERING CO LTD
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  • Summary
  • 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 the production index is not easy to control, there are many side reactions, poor product quality, low yield, and there are safety and environmental protection risks

Method used

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  • A preparation process of 3-15t/d large-scale solid sodium chlorite

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Experimental program
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Effect test

Embodiment 1

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

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

[0042]Finally, add sodium chloride (the addition amount is 0.25 times of the quality of sodium chlorite in the liquid) to the finished solution of sodium chlorite, and the mixed solution of sodium chlorite and sodium chloride is evaporated and crystallized, filtered, and dried to ...

Embodiment 2

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

[0045] Secondly, in the absorption tower, the mixed solution 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. A finished solution of sodium chlorite is obtained.

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

Embodiment 3

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

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

[0050] The above steps are divided into four steps to complete:

[0051] A) the sodium chlorate (concentration is 500g / l) of 100% theoretical mass, the sulfuric acid (mass fraction 98%) of 50% theoretical mass, the hydrogen peroxide of 40% theoretical mass are added in the reactor, and the reaction time is 4 hours, The degree of control response is 40%;

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

[0053] c) 20% hydrogen peroxide was added into the reactor, the reaction time w...

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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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Patent Type & Authority Patents(China)
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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