White carbon black preparation device

Abstract

The utility model relates to a white carbon black preparation device which comprises a carbon dioxide gas supply device, a gas-liquid mixer, a silicate solution supply device, a micro-channel reactor and a stirring settling tank, the output end of the gas-liquid mixer is connected with the input end of the micro-channel reactor, and the output end of the micro-channel reactor is connected with the stirring settling tank. According to the utility model, the reaction process can be accurately controlled, so that carbon dioxide gas and silicate solution are fully mixed and react in the micro-channel, and a high-quality white carbon black product with uniform particle size distribution and large specific surface area is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of white carbon black, in particular to a white carbon black preparation device. Background Art

[0002] Silica gel is a widely used chemical raw material with the advantages of high specific surface area, porosity, high temperature resistance, stable chemical properties, and good electrical insulation. It is mainly used in rubber, plastics, papermaking, paints and coatings, catalyst carriers, food additives and other fields.

[0003] Currently, there are two main methods for preparing silica: the vapor phase method and the precipitation method. The vapor phase method uses chlorosilane or methylchlorosilane as raw materials, and hydrolyzes them at high temperature in a hydrogen-oxygen flame to produce high-quality silica. The silica produced by the vapor phase method has a large specific surface area and a small particle size, but the production cost is relatively high. The precipitation method usually uses sodium silicate as raw material, and sulfuric acid, hydrochloric acid, etc. are added to the solution to adjust the pH value of the solution so that the sodium silicate is hydrolyzed into metasilicic acid, which is then hydrolyzed to produce precipitated silica. This method is generally an intermittent method, and the resulting product requires washing, filter pressing, drying, and other operations before the final product is obtained. The silica produced by the traditional precipitation method has a small specific surface area, a large average particle size, and an uneven particle size distribution. In addition, it also produces a large amount of salt-containing wastewater.

[0004] For the precipitation method of producing silica, the use of carbon dioxide as an acidifier can not only produce high-quality silica, but also reduce the discharge of industrial wastewater. Most importantly, it can consume greenhouse gases. The existing carbon dioxide preparation of precipitated silica is mainly carried out in an intermittent bubbling reactor or in a continuous tubular reactor. For traditional intermittent reactions, due to the internal limitations of the reaction system, the local concentration and temperature are uneven, resulting in uneven product particle size distribution and unstable quality between product batches. For tubular reactors, the distribution of carbon dioxide gas in the pipeline and the reaction time are difficult to control, resulting in uneven reaction and uneven product particle size distribution. Utility Model Content

[0005] The purpose of the utility model is to provide a white carbon black preparation device to solve the above-mentioned problems existing in the current preparation of white carbon black.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A device for preparing white carbon black comprises a carbon dioxide gas supply device, a gas-liquid mixer, a silicate solution supply device, a microchannel reactor and a stirring and settling tank, wherein the carbon dioxide gas supply device and the silicate solution supply device are both connected to the input end of the gas-liquid mixer via pipelines, the output end of the gas-liquid mixer is connected to the input end of the microchannel reactor, and the output end of the microchannel reactor is connected to the stirring and settling tank.

[0008] Furthermore, a first flow meter for detecting the flow of carbon dioxide gas and a first regulating valve for regulating the flow of carbon dioxide are provided on the pipeline between the gas-liquid mixer and the carbon dioxide gas supply device.

[0009] Furthermore, a second flow meter for detecting the flow rate of the silicate solution and a second regulating valve for regulating the flow rate of the silicate solution are provided on the pipeline between the silicate solution supply device and the gas-liquid mixer.

[0010] Furthermore, a silicate solution delivery pump is provided on the pipeline between the second flow meter and the silicate solution supply device.

[0011] Furthermore, the microchannel reactor is connected to an electric heater for adjusting the reaction temperature.

[0012] Furthermore, the stirring and settling tank is connected to a solid separation device for separating settled solids.

[0013] Furthermore, the solid separation device includes a centrifuge.

[0014] Furthermore, the solid separation device includes a filter.

[0015] Beneficial effects of the utility model:

[0016] The silica production device of this utility model utilizes a microchannel reactor to precisely control the reaction process, allowing carbon dioxide gas and a silicate solution to thoroughly mix and react within the microchannels, resulting in a high-quality silica product with a uniform particle size distribution and a large specific surface area. This solves the problems of uneven particle size distribution and unstable product quality associated with traditional precipitation methods for producing silica. The use of carbon dioxide as an acidifier not only avoids the large amounts of salt-containing wastewater discharged by traditional acidifiers but also consumes the greenhouse gas carbon dioxide, offering significant environmental benefits. Compared to traditional batch reaction methods, the device of this utility model enables continuous production, improving production efficiency and reducing production costs. Furthermore, continuous production helps maintain stable product quality.

[0017] Furthermore, by installing control elements such as flow meters and regulating valves, the flow rates of carbon dioxide gas and silicate solution can be easily adjusted, thereby achieving precise control of the reaction process. In addition, the installation of an electric heater can also conveniently adjust the reaction temperature, making the operation more simple and easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a principle diagram of the white carbon black preparation device of the utility model.

[0019] The names corresponding to the marks in the figure are:

[0020] 1. Carbon dioxide gas supply device,

[0021] 2. Gas-liquid mixer,

[0022] 3. Silicate solution supply device,

[0023] 4. Microchannel reactor,

[0024] 5. Mixing and settling tank,

[0025] 6. First flow meter,

[0026] 7. The first regulating valve,

[0027] 8. Second flow meter,

[0028] 9. Second regulating valve,

[0029] 10. Silicate solution delivery pump,

[0030] 11. Electric heater,

[0031] 12. Solid separation device. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0033] Example 1:

[0034] A white carbon black preparation device, its structure is as follows Figure 1 As shown, it includes a carbon dioxide gas supply device 1, a gas-liquid mixer 2, a silicate solution supply device 3, a microchannel reactor 4 and a stirring and settling tank 5. The carbon dioxide gas supply device 1 and the silicate solution supply device 3 are both connected to the input end of the gas-liquid mixer 2 through a pipeline, the output end of the gas-liquid mixer 2 is connected to the input end of the microchannel reactor 4, and the output end of the microchannel reactor 4 is connected to the stirring and settling tank 5.

[0035] During use, carbon dioxide gas is output from carbon dioxide gas supply device 1, and silicate solution is output from silicate solution supply device 3. The two are mixed in gas-liquid mixer 2 to form a gas-liquid mixture. The gas-liquid mixture then enters microchannel reactor 4 for reaction. The resulting silica suspension enters stirring and settling tank 5 for stirring and settling, ultimately producing a silica product.

[0036] Example 2:

[0037] On the basis of Example 1, in order to further control the flow rate of carbon dioxide gas, as Figure 1 As shown, a first flowmeter 6 for detecting the flow of carbon dioxide gas and a first regulating valve 7 for regulating the flow of carbon dioxide gas are provided on the pipeline between the gas-liquid mixer 2 and the carbon dioxide gas supply device 1. The first flowmeter 6 can monitor the flow of carbon dioxide gas in real time, and the first regulating valve 7 can accurately adjust the flow to ensure stable reaction.

[0038] Example 3:

[0039] On the basis of Example 1, in order to further control the flow rate of the silicate solution, as Figure 1 As shown, a second flowmeter 8 for detecting the silicate solution flow rate and a second regulating valve 9 for regulating the silicate solution flow rate are provided on the pipeline between the silicate solution supply device 3 and the gas-liquid mixer 2. Furthermore, a silicate solution delivery pump 10 is provided on the pipeline between the second flowmeter 8 and the silicate solution supply device 3 for stably delivering the silicate solution to the gas-liquid mixer 2. The second flowmeter 8 allows for real-time monitoring of the silicate solution flow rate, while the second regulating valve 9 and silicate solution delivery pump 10 allow for precise flow rate regulation to ensure stable reaction progress.

[0040] Example 4:

[0041] On the basis of Example 1, in order to control the reaction temperature in the microchannel reactor 4, as Figure 1 As shown, the microchannel reactor 4 is connected to an electric heater 11 for adjusting the reaction temperature. The electric heater 11 can heat or keep the microchannel reactor 4 warm to control the reaction temperature within a suitable range, thereby improving the reaction rate and product quality.

[0042] Example 5:

[0043] On the basis of Example 1, in order to conveniently separate the settled solids, as Figure 1As shown, the stirred settling tank 5 is connected to a solid separation device 12 for separating the settled solids. The solid separation device can take various forms. For example, in this embodiment, the solid separation device includes a centrifuge for centrifuging the silica suspension in the stirred settling tank 5 to obtain a silica solid product.

[0044] Example 6:

[0045] As another embodiment of Example 5, the solid separation device may also use a filter (not shown) instead of a centrifuge. The filter may be provided at the outlet of the stirred settling tank 5 to filter and separate the silica suspension to obtain a silica solid product. The specific form of the filter may be selected according to actual needs, for example, a plate and frame filter, a bag filter, etc.

[0046] Working principle:

[0047] First, sodium silicate or other silicate solution is prepared and stored in the silicate solution supply device 3; carbon dioxide gas is prepared to be introduced into the valve in front of the microchannel reactor 4 in advance for standby; the temperature of the microchannel reactor 4 is adjusted to the optimal reaction temperature; the silicate solution and carbon dioxide gas are introduced into the gas-liquid mixer 2 for mixing and then enter the microchannel reactor 4; the reaction time is controlled by adjusting the flow rate of the reactants to obtain white carbon black, and the reactants coming out of the microchannel reactor 4 enter the stirring sedimentation tank for stirring and sedimentation, and after sedimentation, enter the centrifuge or filter for separation to obtain a white solid; the separated white solid is then washed, dried, ground and other operations to obtain high-quality precipitated white carbon black.

[0048] Among them, carbon dioxide gas reacts with silicate solution at a certain temperature to obtain the trans form of silicon dioxide. Taking sodium silicate solution as an example:

[0049] Na2SiO3+2CO2+2H2O=H2SiO3↓+2NaHCO3

[0050]

[0051] Obviously, the embodiments described are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art are within the scope of protection of the present invention.

Claims

1. A device for preparing white carbon black, characterized in that: The invention comprises a carbon dioxide gas supply device, a gas-liquid mixer, a silicate solution supply device, a microchannel reactor and a stirring and settling tank. The carbon dioxide gas supply device and the silicate solution supply device are both connected to the input end of the gas-liquid mixer through pipelines, the output end of the gas-liquid mixer is connected to the input end of the microchannel reactor, and the output end of the microchannel reactor is connected to the stirring and settling tank.

2. The white carbon black preparation device according to claim 1, characterized in that: A first flow meter for detecting the flow of carbon dioxide gas and a first regulating valve for regulating the flow of carbon dioxide are provided on the pipeline between the gas-liquid mixer and the carbon dioxide gas supply device.

3. The white carbon black preparation device according to claim 1, characterized in that: A second flow meter for detecting the flow rate of the silicate solution and a second regulating valve for regulating the flow rate of the silicate solution are provided on the pipeline between the silicate solution supply device and the gas-liquid mixer.

4. The white carbon black production device according to claim 3, characterized in that: A silicate solution delivery pump is provided on the pipeline between the second flow meter and the silicate solution supply device.

5. The white carbon black production device according to claim 1, characterized in that: The microchannel reactor is connected to an electric heater for adjusting the reaction temperature.

6. The white carbon black production device according to claim 1, characterized in that: The stirring and settling tank is connected to a solid separation device for separating settled solids.

7. The white carbon black production device according to claim 6, characterized in that: The solid separation device includes a centrifuge.

8. The white carbon black production device according to claim 6, characterized in that: The solid separation device includes a filter.

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