CN2813580Y - Chlorine dioxide generator - Google Patents

Abstract

The utility model provides a pair of middle and small chlorine dioxide multistage generator with simple operation, high conversion rate, high purity, multiple purposes and environment protection chemical method. The chlorine dioxide generator consists of a kettle type reactor, an acid-resistant conduit and a water jet type vacuum unit. The kettle type reactor adopts a two-stage or multi-stage reactor, an air distributor is arranged in the main reaction kettle, a balance pipe is arranged in the auxiliary reaction kettle, the reaction is more thorough, and the residual liquid after the reaction can reach the standard and be discharged. The generated chlorine dioxide is prepared into aqueous solution, and stable chlorine dioxide solution can also be prepared.

Description

Chlorine Dioxide Generator

Technical field:

The utility model relates to an environment-friendly equipment for preparing an environment-friendly oxidizing disinfectant, in particular to an environment-friendly chlorine dioxide generator with a special structure, high conversion rate of raw materials and high purity of products.

Background technique:

Chlorine dioxide is a broad-spectrum, high-efficiency, non-toxic fungicide, which can be widely used in disinfection, sterilization, algae killing and oxidation treatment. Because chlorine dioxide has the characteristics of strong oxidation and easy decomposition, it is difficult to store and transport, which brings a lot of inconvenience to some occasions that require the use of chlorine dioxide; in addition, some industries that require long-term and continuous use of chlorine dioxide, A stable and reliable device is required to ensure the supply of chlorine dioxide; the disinfection treatment of tap water and other industries requires the use of high-purity chlorine dioxide to reduce the harm to the human body caused by the halogenated hydrocarbons currently produced by chlorine gas disinfection.

Chlorine dioxide generators are usually divided into two categories according to the method of chlorine dioxide generation: chemical method and electrolytic method. The chemical method can be divided into sodium chlorite method and sodium chlorate method according to the raw materials used.

At present, there are two main types of chlorine dioxide generators used at home and abroad: high-purity type and compound type. The high-purity type uses chlorite as a raw material to generate chlorine dioxide. Since the price of chlorite is 2 to 3 times higher than that of chlorate, this method has high operating costs.

The composite chlorine dioxide generator uses chlorate as the raw material to generate chlorine dioxide, and the operating cost is relatively low. Its biggest disadvantage is that the purity of chlorine dioxide is low and the conversion rate of sodium chlorate is low. Commonly used reducing agents in the prior art include chloride ions and methanol. Using chlorine ion as a reducing agent will generate a large amount of chlorine gas, which limits the occasions requiring high-purity chlorine dioxide. Using methanol as a reducing agent to generate chlorine dioxide often produces formaldehyde and formic acid in the product, which brings secondary water pollution problems.

Prior art, such as ZL99205151, the title of invention is multi-unit chlorine dioxide generator, and 99213301, the name is a kind of chlorine dioxide generator, all adopt electrolysis to generate chlorine dioxide. This method consumes a lot of electricity, has a short device life, high maintenance costs, and a large amount of chlorine gas is mixed in the product, and the purity is low. Another technology ZL03268862.8, named chlorine dioxide generator, is a chemical method generator provided to overcome the shortcomings of electrolysis. However, this generator is a single-stage reactor, which has the disadvantages of short reaction residence time, insufficient reaction, and low conversion rate of raw materials.

Invention content:

The purpose of the utility model is to overcome the defects of the above-mentioned prior art and provide an environment-friendly chemical chlorine dioxide multistage generator with high conversion rate of raw materials, high product purity, simple operation and multi-purpose.

The technical scheme of the utility model is: a chlorine dioxide generator, which is composed of a kettle reactor and a water jet vacuum unit 7, and is characterized in that the kettle reactor is composed of a main reactor 1 and a secondary reactor 10 connected, And the auxiliary reactor 10 is provided with a balance pipe 9, the balance pipe 9 is connected with the main reactor 1 and the water jet vacuum unit 7, the tops of the main and auxiliary reactors are connected, and the bottoms of the main and auxiliary reactors are connected.

Wherein, the tank reactor can be composed of one main reactor 1 and two or more secondary reactors 10 .

Both the main and auxiliary reactors are provided with a sampling port 11; the middle of the main reactor 1 is equipped with a perspective mirror 2, and the top of the main reactor 1 is equipped with an air flow meter 3 and an accurate automatic sampler 4.

The main reactor is equipped with an air distributor, and the outside is heated by a wrapped resistance wire. The material of the reactor is titanium; the main reactor 1 is preferably provided with three sampling ports 11; the auxiliary reactor 10 is preferably provided with three sampling ports 11.

The water jet vacuum unit 7 is composed of a water jet vacuum pump 6 and a liquid storage tank 8; the absorption liquid in the liquid storage tank 8 can be water or alkaline absorption liquid.

The material is fed by the autosampler 4, and enters the main reaction kettle 1 from the top of the kettle, and the negative pressure in the kettle is maintained by the water jet vacuum unit 7, so that the reaction is completed under negative pressure. The resulting liquid product passes through the bottom conduit and is introduced into the secondary reactor from the middle. Through the balance pipe 9, part of the gas products generated from the main reactor enters the secondary reactor and continues to react in the reactor. The gaseous product and the gaseous product generated from the main reactor pass through the outlet 5 of the reactor, connect to the water jet vacuum unit, and are absorbed in the liquid storage tank 8 .

The above-mentioned generator uses a two-stage or multi-stage reactor, and the secondary reactor (sub-reactor) is provided with a balance pipe 9, one is to automatically discharge the residual liquid in the system, and the other is to cooperate with the two-stage reactor , keep the reaction conditions in the main and auxiliary reactors constant, and change the pulse flow to continuous flow, so that the reaction can be fully carried out, the reaction is more thorough, the conversion rate of raw materials and the yield of products are improved, and the effective The content of the ingredients, the reaction residual liquid can reach the discharge standard, which is beneficial to environmental protection.

The above-mentioned chlorine dioxide generating equipment can prepare a chlorine dioxide aqueous solution for on-site use; it can also prepare a chlorine dioxide stable solution for storage.

This method uses hydrogen peroxide to reduce sodium chlorate under acidic conditions to prepare chlorine dioxide. This process is a relatively new method for producing chlorine dioxide. The chlorine dioxide produced has high purity and high conversion rate, and has attracted more and more attention. For the production of chlorine dioxide in medium and small-scale devices, using chlorate as raw material can greatly reduce raw material and operating costs. By controlling the reaction conditions, the hydrogen peroxide method can make the chlorine dioxide in the product almost free of chlorine gas, and can not damage the fibers of the fabric during bleaching, and will not produce carcinogens such as chloroform when used in drinking water treatment.

Beneficial effect

1. The utility model adopts a two-stage or multi-stage reactor, and the secondary reactor is equipped with a balance pipe, so that the reaction conditions in the main and secondary reactors are kept constant, and the pulse flow is changed into a continuous flow, so that the reaction is more rapid. Thoroughly, the conversion rate of raw materials and the yield of products are improved, the content of active ingredients in the raffinate is reduced, and the reaction raffinate can reach the discharge standard, which is beneficial to environmental protection.

2. The conversion rate of sodium chlorate can reach 85-100%, the yield of chlorine dioxide can reach 85-98%, and the purity can reach 95-100%. (prior art, sodium chlorate conversion rate 85～95%, chlorine dioxide yield 90%, purity 90～95%, are laboratory data)

3. The utility model is suitable for the production of chlorine dioxide in medium and small-scale devices, and can be implemented continuously and automatically controlled.

4. The chlorine dioxide generated by the device can be directly used for on-site water treatment when it is passed into the water; the chlorine dioxide is absorbed by the alkaline solution and can be made into a finished chlorine dioxide stable solution, which is convenient for storage, transportation and sales.

5. The body of the main and side reaction kettle is equipped with a sampling port, which can be used for real-time monitoring, to measure the concentration of each reactant, and to investigate the mechanism of the reaction. Small devices can be used for scientific research.

Description of drawings

Figure 1 shows the structure of the chlorine dioxide generator.

Figure 2 is a sectional view of the main reactor.

Fig. 3 is a sectional view of Fig. 2A-A.

In the figure 1. Main reactor, 2. Perspective mirror, 3. Air flow meter, 4. Autosampler, 5. Reactor outlet, 6. Vacuum pump, 7. Water jet vacuum unit, 8. Liquid storage Groove, 9 balance pipes, 10. auxiliary reactor, 11. sampling port, 12. air distributor.

Wherein 2. The perspective mirror can observe the reaction situation, observe the color of the gas in the reactor with the naked eye, and preliminarily judge whether the reaction is carried out normally; 4. The automatic sampler, the raw material inlet can use mixed sodium chlorate and hydrogen peroxide.

Detailed ways:

Example 1:

The preparation method of high-concentration and high-purity chlorine dioxide is as follows: sodium chlorate solution is used as an oxidizing agent, and 27% hydrogen peroxide solution is used as a reducing agent to react in 20% sulfuric acid medium. Ratio of incoming raw materials NaClO ₃ : _{H 2} O ₂ : H ₂ SO ₄ =2:1:1, control the reaction time to be more than 1 hour, the reaction temperature is 50°C, and the negative pressure is 0.01Mpa.

Raw materials sodium chlorate, hydrogen peroxide and sulfuric acid enter the reactor 1 in proportion from the top autosampler 4 of the main reactor 1, and react after being fully mixed with the air coming out through the air flow meter 3 and the air distributor 12 to form high Concentrated high-purity chlorine dioxide solution. The saturated chlorine dioxide solution is stirred by air, and small bubbles escape from the reaction solution. The incompletely reacted liquid in the main reactor 1 enters the auxiliary reactor 10 through the conduit, and part of the gas products generated by the reaction enters the auxiliary reactor 10 through the balance pipe 9 to continue the reaction. Chlorine dioxide gas produced in the main and auxiliary reactors enters the ejector vacuum unit 7 through the reaction outlet 5 and is sucked into the storage tank 8 . When the absorption liquid in the storage tank is water, an aqueous solution of chlorine dioxide is formed, which can be directly put into use as a product. When the absorption liquid in the storage tank is lye, a chlorine dioxide stable solution is formed.

Example 2:

The preparation method of high-concentration and high-purity chlorine dioxide is as follows: sodium chlorate solution is used as an oxidizing agent, and 30% hydrogen peroxide solution is used as a reducing agent to react in 50% sulfuric acid medium. The ratio of raw materials entering is NaClO ₃ : _{H 2} O ₂ : H ₂ SO ₄ =6:4:3, the reaction time is controlled to be more than 1 hour, the reaction temperature is 70°C, and the negative pressure is 0.01Mpa.

The raw materials sodium chlorate, hydrogen peroxide and sulfuric acid enter the reactor 1 in proportion from the autosampler 4 at the top of the main reactor 1, and react after being fully mixed with the air coming out of the air flow meter 3 and the air distributor 12 to generate a high concentration High-purity chlorine dioxide solution. The saturated chlorine dioxide solution is stirred by air, and small bubbles escape from the reaction solution. The incompletely reacted liquid in the main reactor 1 enters the auxiliary reactor 10 through the conduit, and part of the gas products generated by the reaction enters the auxiliary reactor 10 through the balance pipe 9 to continue the reaction. The incompletely reacted liquid in the main and auxiliary reactors enters the remaining reactors through the conduit, and part of the chlorine dioxide gas also enters the remaining reactors to continue the reaction. The chlorine dioxide gas stirred by the air and the gas in the balance pipe 9 and the chlorine dioxide gas in the main reaction kettle enter the ejector vacuum unit 7 through the reaction outlet 5 and are sucked into the storage tank 8 . When the absorption liquid in the storage tank is water, an aqueous solution of chlorine dioxide is formed, which can be directly put into use as a product. When the absorption liquid in the storage tank is lye, a chlorine dioxide stable solution is formed.

Claims (8)

1, a kind of chlorine dioxide generator, form by tank reactor and water-jetting type vacuum unit (7), it is characterized in that tank reactor is connected and composed by main reaction still (1) and secondary reacting kettle (10), and secondary reacting kettle (10) is provided with equilibration tube (9), equilibration tube (9) links to each other with water-jetting type vacuum unit (7) with main reaction still (1), the still top of major and minor reactor is communicated with, and is communicated with at the bottom of the still of major and minor reactor.

2, producer according to claim 1 is characterized in that tank reactor can be by 1 main reaction still (1) and 2 or 2 above secondary reacting kettles (10) formation.

3, producer according to claim 1 is characterized in that major and minor reactor all is provided with thief hole (11); Photoscope (2) is equipped with at the middle part of main reaction still (1), and the still of main reaction still (1) is top-loaded with air flowmeter (3) and accurate automatic sampler (4).

4, producer according to claim 1 is characterized in that being provided with air-distributor in the main reaction still, the outside resistance wire heating that utilizes parcel, and the material of reactor is the titanium material.

5, producer according to claim 1 is characterized in that main reaction still (1) is provided with three place's thief holes (11).

6, producer according to claim 1 is characterized in that secondary reacting kettle (10) is provided with three place's thief holes (11).

7, producer according to claim 1 is characterized in that water-jetting type vacuum unit (7) is made up of water-jetting type vacuum pump (6) and liquid storage groove (8).

8, producer according to claim 7 is characterized in that the absorption liquid in the liquid storage groove (8) can be a water, or alkaline absorption solution.

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