A reaction vessel for preparing silica using carbon dioxide method

Abstract

This invention discloses a reactor for preparing silica using a carbon dioxide method, comprising a reactor body and a carbon dioxide inlet pipe. A water glass feed pipe and a steam heating pipe are connected to the reactor body. A discharge port is connected to the bottom of the reactor body. A motor is installed at the center of the upper end of the reactor body. The motor's output is connected to a stirring shaft located inside the reactor body via a reducer. Several stirring paddles are installed on the stirring shaft. One end of the carbon dioxide inlet pipe extends into the interior of the reactor body, and a carbon dioxide dispersion pipe extending to the bottom of the reactor body is connected to this end. This invention utilizes the carbon dioxide tail gas generated during the drying process as a precipitant to obtain silica precipitate. Compared with the existing technology that uses sulfuric acid as a precipitant, this not only saves the cost of using sulfuric acid but also reduces carbon emissions.

Description

Technical Field

[0001] This utility model belongs to the field of silica production technology, specifically relating to a reaction vessel for preparing silica using the carbon dioxide method. Background Technology

[0002] Silica is an amorphous form of silica, sometimes referred to as industrial MSG. As a core reinforcing material for high-performance tires, silica can significantly improve grip, tear resistance, and reduce rolling resistance, making it a key additive in the widespread adoption of new energy vehicles.

[0003] In the drying process of silica production, natural gas or coal is used as a heat source, which will generate a lot of carbon emissions. Traditional silica production requires the use of a large amount of sulfuric acid as a precipitant to obtain silica precipitate.

[0004] Therefore, there is an urgent need for a reaction vessel for preparing silica using carbon dioxide, which utilizes the carbon dioxide gas generated during the drying process as a precipitant to obtain silica precipitate. This not only eliminates the cost of using sulfuric acid but also reduces carbon emissions. Utility Model Content

[0005] The purpose of this invention is to provide a reaction vessel for preparing precipitated silica using a carbon dioxide method, thereby solving the problems mentioned in the background art. The reaction vessel for preparing precipitated silica using a carbon dioxide method provided by this invention eliminates the cost of using sulfuric acid and also reduces carbon emissions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a reaction vessel for preparing silica by carbon dioxide method, comprising a reaction vessel body and a carbon dioxide inlet pipe, wherein a water glass feed pipe and a steam heating pipe are respectively connected to the reaction vessel body, a discharge port is connected to the bottom of the reaction vessel body, a motor is installed at the center of the upper end of the reaction vessel body, the output end of the motor is connected to a stirring shaft located inside the reaction vessel body through a reducer, a plurality of stirring paddles are installed on the stirring shaft, one end of the carbon dioxide inlet pipe extends into the interior of the reaction vessel body, and a carbon dioxide dispersion pipe extending to the bottom of the reaction vessel body is connected to that end.

[0007] To facilitate observation of the interior of the reactor body, an observation window is further provided at the top of the reactor body.

[0008] To make the water glass solution easier to disperse, the end of the water glass feed pipe inside the reactor body is L-shaped, and the outlet end of the water glass feed pipe corresponds to the stirring paddle in the middle position.

[0009] To significantly improve the contact between carbon dioxide and water glass solution and enhance reaction efficiency, the carbon dioxide dispersion tube further comprises an outer tube and an inner tube. The inner tube is located inside the outer tube. The outer tube is made of stainless steel and has several gas guide holes on its wall. The diameter of the gas guide holes is 1-3 mm, and the spacing between adjacent gas guide holes is 5-10 mm. The inner tube is a polytetrafluoroethylene (PTFE) sintered tube with a void size of 10-100 μm.

[0010] In order to reintroduce unreacted carbon dioxide into the reactor body to continue the reaction and thus reduce carbon emissions, several carbon dioxide recovery pipes are connected to the upper end of the reactor body. One end of the carbon dioxide recovery pipe is located inside the reactor body, and the other end of the carbon dioxide recovery pipe is connected to the inlet of the circulation pump through a connecting pipe. The outlet of the circulation pump is connected to the carbon dioxide inlet pipe through a connecting pipe.

[0011] In order to re-inhale the unreacted carbon dioxide gas at the top of the reactor body into the bottom of the reactor body for re-reaction and reduce carbon emissions, the bottommost stirring blade is a self-priming blade, the stirring shaft is a hollow structure, and the upper end of the stirring shaft is provided with several through holes.

[0012] To monitor the temperature and pH value inside the reactor body in real time and improve the stability of the reaction process, a thermometer is further installed on the reactor body. A pH meter is also installed on the reactor body.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model uses the carbon dioxide tail gas generated during the drying process as a precipitant to obtain silica precipitate. Compared with the existing technology that uses sulfuric acid as a precipitant, it not only saves the cost of using sulfuric acid, but also reduces carbon emissions.

[0015] 2. The carbon dioxide dispersion tube of this utility model includes an outer tube and an inner tube, wherein the inner tube is set inside the outer tube. The outer tube is a stainless steel tube with several gas guiding holes on its wall. The inner tube is a polytetrafluoroethylene sintered tube, which can greatly improve the contact between carbon dioxide and water glass solution and improve the reaction efficiency.

[0016] 3. The upper end of the reaction vessel body of this utility model is connected to four carbon dioxide recovery pipes. The other end of the carbon dioxide recovery pipe is connected to the inlet of the circulation pump through a connecting pipe. The outlet of the circulation pump is connected to the carbon dioxide inlet pipe through a connecting pipe. Unreacted carbon dioxide can be sent back into the reaction vessel body to continue the reaction, thereby reducing carbon emissions.

[0017] 4. The bottommost stirring blade of this utility model is a self-priming blade, the stirring shaft is a hollow structure, and the upper end of the stirring shaft is provided with several through holes, so that the unreacted carbon dioxide gas at the top of the reactor body is re-inhaled into the bottom of the reactor body for re-reaction, thereby reducing carbon emissions.

[0018] 5. The reaction vessel body of this utility model is equipped with a thermometer and a pH meter, which are used to monitor the temperature and pH value inside the reaction vessel body in real time, thereby improving the stability of the reaction process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the carbon dioxide dispersion tube of this utility model.

[0021] In the diagram: 1. Reactor body; 2. Stirring paddle; 3. Water glass feed pipe; 4. Steam heating pipe; 5. Discharge port; 6. Carbon dioxide dispersion pipe; 61. Outer pipe; 62. Inner pipe; 7. Circulation pump; 8. Thermometer; 9. pH meter; 10. Carbon dioxide inlet pipe; 11. Motor; 12. Carbon dioxide recovery pipe; 13. Stirring shaft. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] Please see Figures 1-2This utility model provides the following technical solution: a reaction vessel for preparing silica using the carbon dioxide method, comprising a reaction vessel body 1 and a carbon dioxide inlet pipe 10, the carbon dioxide inlet pipe 10 being connected to the tail gas generated during the drying process; a water glass feed pipe 3 and a steam heating pipe 4 being connected to the reaction vessel body 1 respectively; a discharge port 5 being connected to the bottom of the reaction vessel body 1, with a control valve installed on the discharge port 5; a motor 11 being installed at the center of the upper end of the reaction vessel body 1, with a stirring shaft 13 located inside the reaction vessel body 1 connected to the output end of the motor 11; the stirring shaft 13... Three stirring paddles 2 are installed on the upper part. The outlet end of the steam heating pipe 4 is flush with the bottom stirring paddle 2. The steam and materials entering the reactor body 1 can be quickly dispersed by the paddles to form bubbles that encapsulate the materials, thereby improving the heating efficiency and temperature uniformity of the materials inside the reactor body 1. One end of the carbon dioxide inlet pipe 10 extends into the interior of the reactor body 1, and a carbon dioxide dispersion pipe 6 extending to the bottom of the reactor body 1 is connected to this end. The reactor body 1 and all accessories must be sealed to prevent carbon dioxide gas from leaking out.

[0025] By adopting the above technical solution, this utility model uses the carbon dioxide tail gas generated during the drying process as a precipitant to obtain silica precipitate. Compared with the existing technology that uses sulfuric acid as a precipitant, it not only saves the cost of using sulfuric acid, but also reduces carbon emissions.

[0026] Specifically, an observation window is provided at the upper end of the reactor body 1.

[0027] By adopting the above technical solution, it is convenient to observe the internal condition of the reaction vessel body 1.

[0028] Specifically, the water glass feed pipe 3 has an L-shaped structure at one end inside the reactor body 1, and the discharge end of the water glass feed pipe 3 corresponds to the stirring paddle 2 in the middle position.

[0029] By adopting the above technical solution, water glass solution can be more easily dispersed.

[0030] Specifically, the carbon dioxide dispersion tube 6 includes an outer tube 61 and an inner tube 62. The inner tube 62 is located inside the outer tube 61. The outer tube 61 is a stainless steel tube with several air guide holes on its wall. The diameter of the air guide holes is 1-3 mm and the spacing between adjacent air guide holes is 5-10 mm. The inner tube 62 is a polytetrafluoroethylene sintered tube with a void size of 10-100 μm.

[0031] By adopting the above technical solution, the contact between carbon dioxide and water glass solution can be greatly improved, thereby increasing the reaction efficiency.

[0032] Example 2

[0033] The difference between this embodiment and Embodiment 1 is that, specifically, four carbon dioxide recovery pipes 12 are connected to the upper end of the reactor body 1. One end of the carbon dioxide recovery pipe 12 is located inside the reactor body 1, and the other end of the carbon dioxide recovery pipe 12 is connected to the inlet end of the circulating pump 7 through a connecting pipe. The outlet end of the circulating pump 7 is connected to the carbon dioxide inlet pipe 10 through a connecting pipe. A condenser pipe is also connected between the carbon dioxide recovery pipe 12 and the circulating pump 7. The gas inside the upper part of the reactor body 1 is cooled by the condenser pipe, so that the water vapor is condensed into water and discharged through the condenser pipe, and the carbon dioxide gas enters the circulating pump 7.

[0034] By adopting the above technical solution, unreacted carbon dioxide can be reintroduced into the reactor body 1 to continue the reaction, thereby reducing carbon emissions.

[0035] Example 3

[0036] The difference between this embodiment and embodiment 1 is that, specifically, the bottommost stirring blade 2 is a self-priming blade, the stirring shaft 13 is a hollow structure, and the upper end of the stirring shaft 13 is provided with several through holes. The structure and principle of the self-priming blade are known prior art in a raw material loading and unloading device for chloroacetic acid production disclosed in Chinese Patent Application No. 202420681213.4.

[0037] By adopting the above technical solution, the unreacted carbon dioxide gas at the top of the reactor body 1 is re-inhaled to the bottom of the reactor body 1 for re-reaction, thereby reducing carbon emissions.

[0038] Example 4

[0039] The difference between this embodiment and embodiment 1 is that, specifically, a thermometer 8 and a pH meter 9 are installed on the reactor body 1. Both the thermometer 8 and the pH meter 9 are purchased from the market.

[0040] By adopting the above technical solution, the temperature and pH value inside the reactor body 1 can be monitored in real time, thereby improving the stability of the reaction process.

[0041] In summary, this invention utilizes the carbon dioxide tail gas generated during the drying process as a precipitant to obtain silica precipitate. Compared with the existing technology that uses sulfuric acid as a precipitant, this not only eliminates the cost of using sulfuric acid but also reduces carbon emissions. The carbon dioxide dispersion tube 6 of this invention includes an outer tube 61 and an inner tube 62. The inner tube 62 is located inside the outer tube 61. The outer tube 61 is made of stainless steel and has several gas guide holes on its wall. The inner tube 62 is a polytetrafluoroethylene sintered tube, which greatly improves the contact between carbon dioxide and water glass solution, thereby increasing reaction efficiency. Four carbon dioxide recovery pipes 12 are connected to the upper end of the reactor body 1. The other end of the carbon dioxide recovery pipes 12 is connected to the inlet of the circulating pump 7 via a connecting pipe. The outlet of the circulating pump 7 is connected to the carbon dioxide inlet pipe 10 via a connecting pipe, allowing unreacted carbon dioxide to be reintroduced into the reactor body 1 for further reaction, thus reducing carbon emissions. The bottommost stirring blade 2 of this invention is a self-priming blade, and the stirring shaft 13 is a hollow structure with several through holes at its upper end. This allows unreacted carbon dioxide gas from the upper part of the reactor body 1 to be drawn back into the bottom of the reactor body 1 for re-reaction, reducing carbon emissions. A thermometer 8 and a pH meter 9 are installed on the reactor body 1 to monitor the internal temperature and pH value in real time, improving the stability of the reaction process.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reactor for the production of white carbon black by the carbon dioxide process, characterized in that: The reactor includes a reactor body and a carbon dioxide inlet pipe. A water glass feed pipe and a steam heating pipe are connected to the reactor body. A discharge port is connected to the bottom of the reactor body. A motor is installed at the center of the upper end of the reactor body. The output end of the motor is connected to a stirring shaft located inside the reactor body through a reducer. Several stirring paddles are installed on the stirring shaft. One end of the carbon dioxide inlet pipe extends into the interior of the reactor body, and a carbon dioxide dispersion pipe extending to the bottom of the reactor body is connected to this end.

2. The reactor for preparing white carbon black by carbon dioxide method according to claim 1, characterized in that: An observation window is provided at the upper end of the reactor body.

3. The reactor for preparing white carbon black by carbon dioxide method according to claim 1, characterized in that: The water glass feed pipe has an L-shaped structure at one end inside the reactor body, and the discharge end of the water glass feed pipe corresponds to the stirring paddle in the middle position.

4. The reactor for preparing white carbon black by carbon dioxide method according to claim 1, characterized in that: The carbon dioxide dispersion tube includes an outer tube and an inner tube, wherein, The inner tube is located inside the outer tube, which is made of stainless steel. The outer tube has several air guide holes on its wall, with a diameter of 1-3 mm and a spacing of 5-10 mm between adjacent air guide holes. The inner tube is made of polytetrafluoroethylene (PTFE) sintered tube, with a void size of 10-100 μm.

5. The reactor for preparing white carbon black by carbon dioxide method according to claim 1, characterized in that: The upper end of the reactor body is connected to several carbon dioxide recovery pipes. One end of the carbon dioxide recovery pipe is located inside the reactor body, and the other end of the carbon dioxide recovery pipe is connected to the inlet of the circulation pump through a connecting pipe. The outlet of the circulation pump is connected to the carbon dioxide inlet pipe through a connecting pipe.

6. The reactor for preparing white carbon black by carbon dioxide method according to claim 1, characterized in that: The bottommost agitator is a self-priming blade, the agitator shaft is a hollow structure, and the upper end of the agitator shaft has several through holes.

7. The reactor for preparing white carbon black by carbon dioxide method according to claim 1, characterized in that: A thermometer is installed on the reactor body.

8. The reactor for preparing white carbon black by carbon dioxide method according to claim 1, characterized in that: A pH meter is installed on the reactor body.

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