Environment-friendly oxidized carbon black production equipment

Abstract

The utility model relates to environment-friendly oxidized carbon black production equipment, which comprises a fluidized bed reactor taking inert gas as airflow, and a nitric acid spray assembly for adding nitric acid spray into the fluidized bed reactor, and the nitric acid spray assembly comprises a spray head entering the fluidized bed reactor and a storage tank, the gas outlet end of the fluidized bed reactor is communicated with a nitric acid collector for recovering nitric acid and nitric oxide; the nitric acid collector is communicated with the storage tank through a pipeline and a valve. Oxidized carbon black is produced by combining a gas phase method and a liquid phase method, carbon black particles are placed on the fluidized bed to float, and then nitric acid is sprayed for reaction, so that the reaction temperature can be controlled by accurately controlling the spraying amount of the nitric acid, the influence on the internal structure of the carbon black due to over-high local temperature is prevented, and the service life of the carbon black is prolonged. The nitric acid collector is arranged to recover unreacted nitric acid and nitric oxide, so that nitric oxide is regenerated into nitric acid and reused, and pollution of exhausted gas to the atmosphere is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to carbon black processing equipment field, concretely relates to an environmental protection type oxidized carbon black production equipment. BACKGROUND

[0002] Carbon black is nanometer carbon particle formed by hydrocarbon substance cracking at high temperature, and oxidized carbon black is the product after carbon black is treated by oxidation, the surface functional group increases, the nature changes, has good electric conductivity, thermal conductivity and adsorption performance. Nitric acid as a strong oxidant can react with carbon atom on the surface of carbon black, and introduce oxygen-containing functional groups such as carboxyl and hydroxyl, and the introduction of these functional groups can significantly change the surface properties and functions of carbon black.

[0003] At present, the mainstream production method of oxidized carbon black on the market is liquid phase method and gas phase method, and the traditional production method has the following disadvantages: a large amount of nitrogen oxides (NOx) is produced in the oxidation process of nitric acid, these gases are one of atmospheric pollutants, harmful to the environment and human health, and the disposal cost of waste is too high;The reaction is difficult to control, nitric acid oxidation is a strong exothermic reaction, and the control of temperature and concentration during the reaction process is very critical, if not properly controlled, it is easy to cause the reaction to be too violent, and produce uneven products, and even may cause safety accidents. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the above-mentioned problems and provides an environmental protection type oxidized carbon black production equipment.

[0005] The utility model realizes the above-mentioned purposes through the following technical schemes:

[0006] An environmental protection type oxidized carbon black production equipment, including fluidized bed reactor with inert gas as airflow, nitric acid spraying assembly for adding nitric acid spray into fluidized bed reactor, wherein, the nitric acid spraying assembly includes spray head into fluidized bed reactor and storage tank, the gas outlet end of the fluidized bed reactor is connected with nitric acid collector for recycling nitric acid and nitrogen oxides, and the nitric acid collector and the storage tank are communicated through pipeline and valve.

[0007] As a further optimization scheme of the utility model, the fluidized bed reactor includes air inlet base, fluidized chamber and carbon black holding bed arranged between the air inlet base and the fluidized chamber, and the air inlet base is uniformly distributed with air blowing ports, and the scheme proposes a fluidized bed reactor, which floats carbon black particles in the fluidized chamber, and then introduces nitric acid spray for reaction, which is conducive to the control of nitric acid supply amount and easy to control temperature.

[0008] As a further optimization scheme of the utility model, still include nitrogen tank and be used for sending nitrogen pressurization into the air inlet base of blowing generation device, by using nitrogen as fluidized bed reactor's fluidized gas, it is favorable to reduce the influence of side reaction.

[0009] As a further optimization scheme of the utility model, the upper end outlet of the fluidized chamber is provided with a filter element, which prevents a small amount of carbon black particles from being discharged with the airflow.

[0010] As a further optimization scheme of the utility model, the filter element outlet is commonly connected with a vibration tube, and a vibration generator is further connected between the vibration tube and the inner wall of the fluidized chamber, and the end of the vibration tube is connected to the nitric acid collector through a hose.

[0011] As a further optimization scheme of the utility model, a condenser is further provided between the hose and the nitric acid collector, which cools the heat generated during the reaction of nitric acid and carbon black, so that the evaporated droplets are recondensed.

[0012] As a further optimization scheme of the utility model, the nitric acid collector has an exhaust port and an oxygen input port, which not only collects the unreacted nitric acid solution, but also sets up an oxygen input port for oxidizing NO to NO2, and then reacts with water to form nitric acid for recycling.

[0013] The utility model has the advantages that:

[0014] The utility model produces oxidized carbon black by combining gas phase method and liquid phase method, places carbon black particles on the fluidized bed, then sprays nitric acid for reaction, which is conducive to controlling the reaction temperature by precisely controlling the amount of nitric acid sprayed, preventing local temperature from being too high to affect the internal structure of carbon black, recycling unreacted nitric acid and nitrogen oxides, making nitrogen oxides regenerate nitric acid, and reducing air pollution caused by exhaust gas. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the overall structure schematic diagram of the utility model.

[0016] In the figure: 1, fluidized bed reactor; 11, fluidized chamber; 12, air inlet base; 13, air blowing port; 14, carbon black holding bed; 15, filter element; 16, vibration generator; 17, vibration tube; 18, hose; 2, nitric acid spraying assembly; 21, storage tank; 22, pump; 23, spray head; 3, blowing generation device; 4, condenser; 5, nitric acid collector; 6, valve; 7, nitrogen tank. DETAILED DESCRIPTION

[0017] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] Example 1

[0019] like Figure 1 As shown, an environmentally friendly carbon black oxide production equipment includes a fluidized bed reactor 1 with inert gas as the gas flow, and a nitric acid spray assembly 2 for adding nitric acid spray into the fluidized bed reactor 1. The nitric acid spray assembly 2 includes a spray head 23 that enters the fluidized bed reactor 1, a pump 22, and a storage tank 21. The gas outlet of the fluidized bed reactor 1 is connected to a nitric acid collector 5 for recovering nitric acid and nitrogen oxides. The nitric acid collector 5 and the storage tank 21 are connected by a pipe and a valve 6.

[0020] In this embodiment, the carbon black particles are selected as furnace black in powder form, with a specific surface area between 200 and 300 and a particle size between 20 and 25 micrometers. The fluidized bed reactor 1 is equipped with an automatic heating function. The spray head 23 is made of 304 stainless steel and the size of the sprayed atomized particles is about 1 micrometer. The remaining lining materials and pipes are made of corrosion-resistant polytetrafluoroethylene.

[0021] This scheme produces carbon black oxide by combining gas-phase and liquid-phase methods. The carbon black particles are placed on a fluidized bed to float, and then nitric acid is sprayed in for reaction. This allows for precise control of the nitric acid injection amount, thereby controlling the reaction temperature and preventing local overheating that could affect the internal structure of the carbon black. By setting up a nitric acid collector 5, unreacted nitric acid and nitrogen oxides are recovered, allowing the nitrogen oxides to regenerate nitric acid for reuse, thus reducing the pollution of the atmosphere by the emitted gases.

[0022] The fluidized bed reactor 1 includes an air inlet base 12, a fluidization chamber 11, and a carbon black storage bed 14 disposed between the air inlet base 12 and the fluidization chamber 11. Air inlets 13 are evenly distributed in the air inlet base 12. This solution proposes a fluidized bed reactor 1, which allows carbon black particles to float in the fluidization chamber and then nitric acid spray to react, which is beneficial for controlling the amount of nitric acid supplied and makes temperature control easy.

[0023] It also includes a nitrogen tank 7 and a blowing device 3 for pressurizing and feeding nitrogen into the air inlet base 12. By using nitrogen as the fluidizing gas of the fluidized bed reactor 1, it is beneficial to reduce the influence of side reactions. The blowing device 3 can be an air compressor or a blower.

[0024] A filter 15 is arranged at the upper end outlet of the fluidized chamber 11, and the filter 15 prevents a small amount of carbon black particles from being discharged with the airflow. The outlet of the filter 15 is in common communication with a vibrating tube 17, and a vibration generator 16 is further connected between the vibrating tube 17 and the inner wall of the fluidized chamber 11. The end of the vibrating tube 17 is connected to the nitric acid collector 5 through a hose 18. The vibration generator 16 is arranged to shake the filter 15 and shake off the carbon black particles that do not participate in the reaction. The filter 15 can be arranged as a cloth bag, and a keel is arranged inside the cloth bag to open the cloth bag.

[0025] A condenser 4 is further arranged between the hose 18 and the nitric acid collector 5. The nitric acid is exothermic during the reaction with the carbon black, and the condenser 4 is arranged to cool the nitric acid and make the evaporated liquid droplets recondense.

[0026] The nitric acid collector 5 has an exhaust port and an oxygen input port. The exhaust port is used to discharge the main gas blown by the fluidized bed. The nitric acid collector 5 can not only collect the nitric acid solution that is not completely reacted, but also has the oxygen input port for oxidizing NO to NO2, and then making other nitrogen oxides react with water to form nitric acid, so as to be recycled. It should be noted that the nitrogen oxides mainly include NO and NO2. After the nitrogen oxides and dilute nitric acid are recycled, all the nitrogen oxides except NO can react with water to ultimately generate nitric acid. Some nitrogen oxides may generate by-products NO during the reaction. The oxygen is introduced to make the NO generate NO2, and then further generate nitric acid. If necessary, other reaction conditions can be added according to the prior art to accelerate the absorption rate of NO, such as adding a catalyst or further pressurizing the gas from the condenser 4 and then inputting the gas into the nitric acid collector 5 by arranging another air compressor.

[0027] The specific embodiment is as follows: the furnace carbon black powder is put into the fluidized bed reactor, the fluidized bed is started, the airflow speed is adjusted (about 0.3 m-0.7 m / s), the inert gas is introduced to blow the carbon black powder to float in the lower part of the container, the spray head 23 is opened, and the atomized nitric acid is sprayed (the flow rate is about 0.3 L-1 L / min). The temperature of the fluidized bed reactor is adjusted to 60-80 ℃, the vibration generator is opened, and the carbon black particles that do not participate in the reaction are shaken off. When the liquid amount collected in the nitric acid collector 6 is 50%-60%, the valve 6 is opened, the nitric acid is transported to the storage tank 21, and the concentration of the nitric acid in the storage tank 21 is adjusted to the required concentration and then the nitric acid is continuously used.

[0028] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. An environmentally friendly carbon black oxide production equipment, characterized in that: The fluidized bed reactor (1) uses inert gas as the gas flow and a nitric acid spray assembly (2) for adding nitric acid spray into the fluidized bed reactor (1). The nitric acid spray assembly (2) includes a spray head (23) that enters the fluidized bed reactor (1) and a storage tank (21). The outlet of the fluidized bed reactor (1) is connected to a nitric acid collector (5) for recovering nitric acid and nitrogen oxides. The nitric acid collector (5) and the storage tank (21) are connected by a pipe and a valve (6).

2. The environmentally friendly carbon black oxide production equipment according to claim 1, characterized in that: The fluidized bed reactor (1) includes an air inlet base (12), a fluidized chamber (11), and a carbon black storage bed (14) disposed between the air inlet base (12) and the fluidized chamber (11). Air inlets (13) are evenly distributed in the air inlet base (12).

3. The environmentally friendly carbon black oxide production equipment according to claim 2, characterized in that: It also includes a nitrogen tank (7) and a blowing device (3) for pressurizing and feeding nitrogen into the air inlet base (12).

4. The environmentally friendly carbon black oxide production equipment according to claim 2, characterized in that: A filter element (15) is provided at the upper outlet of the fluidization chamber (11).

5. The environmentally friendly carbon black oxide production equipment according to claim 4, characterized in that: The outlet of the filter element (15) is connected to a vibrating tube (17), and a vibration generator (16) is connected between the vibrating tube (17) and the inner wall of the fluidization chamber (11). The end of the vibrating tube (17) is connected to the nitric acid collector (5) through a hose (18).

6. The environmentally friendly carbon black oxide production equipment according to claim 5, characterized in that: A condenser (4) is also provided between the hose (18) and the nitric acid collector (5).

7. The environmentally friendly carbon black oxide production equipment according to claim 1, characterized in that: The nitric acid collector (5) has an exhaust port and an oxygen inlet.

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