A synthesis apparatus for continuously producing precipitated silica

Abstract

The utility model discloses a kind of synthesis device for continuously preparing precipitated silica, including control pipe and synthetic pipeline, the control pipe one end is equipped with synthetic water import, the control pipe other end is connected with synthetic pipeline one end, the synthetic pipeline other end is equipped with silica suspension outlet, the synthetic pipeline is formed by the combination of several synthesis tubes in series or parallel, the synthesis tube includes charging pipe, reaction tube and sampling tube, the reaction tube is between charging pipe and sampling tube, particle size filter plate is equipped between charging pipe and reaction tube and between reaction tube and sampling tube;The synthesis device for continuously preparing precipitated silica of the utility model can continuously synthesize precipitated silica, the device structure is simple, and can be set outdoors;And by the selection of the number of synthesis tube and particle size filter plate, different pore volume, particle size requirement of silica can be synthesized, and particle size distribution is controlled in relatively narrow distribution range.

Description

Technical Field

[0001] This utility model relates to the technology of equipment for the production of silica by precipitation, specifically a synthesis device for the continuous preparation of silica by precipitation. Background Technology

[0002] Precipitated silica, also known as hydrated silica (English name: Hydrated Silica; Silicon dioxide hydrate), is commonly called white carbon black. It appears as a white amorphous powder. Its molecular structure can be represented by SiO2nH2O. In the rubber industry, it is mainly used as a reinforcing agent to enhance its reinforcing effect. It can also be used as a carrier in agriculture and animal feed; and as a flow aid and anti-caking agent in the powder industry. Due to its high hardness and abrasive properties, it is used as an abrasive and thickener in high-grade toothpaste formulations. The dense micropores of white carbon black provide excellent electron migration pathways for battery separators. In the coatings industry, white carbon black provides excellent anti-blocking effects. It is also an important material in the foam elimination and anti-sticking agent industries. The traditional precipitated silica manufacturing process involves reacting sodium silicate (sodium silicate) solution and sulfuric acid in a fixed reaction tank, agitated by a stirrer, with a specific acid-base ratio, and adjusted temperature and pH, to synthesize a white silica suspension. The silica solid and aqueous solution are then separated by physical filtration equipment. After washing and purifying, the silica is dried to remove the bonded water in the solid, resulting in a powdered silica product.

[0003] The current process requires pumping synthesis water into a reactor to raise the temperature, then injecting sodium silicate solution and acid in a specific ratio into the reactor for synthesis. The reaction is then stopped by adding excess acid to complete the synthesis. However, the current process is a batch process, limiting continuous operation. Furthermore, the large container volume can cause concentration polarization or uneven mixing of the acid and alkali during synthesis due to stirring. Additionally, the synthesized silica particles have an extremely wide particle size distribution, making pore volume control difficult. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a synthesis apparatus for the continuous preparation of precipitated silica, which can continuously synthesize precipitated silica and control the particle size distribution range of the synthesized silica particles.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a synthesis apparatus for continuous preparation of precipitated silica, comprising a control tube and a synthesis pipeline. One end of the control tube is provided with a synthesis water inlet, and the other end of the control tube is connected to one end of the synthesis pipeline. The other end of the synthesis pipeline is provided with a silica suspension outlet. The synthesis pipeline is composed of several synthesis tubes connected in series or in parallel. The synthesis tube includes a feeding tube, a reaction tube, and a sampling tube. The reaction tube is located between the feeding tube and the sampling tube. Particle size filter plates are provided between the feeding tube and the reaction tube and between the reaction tube and the sampling tube.

[0006] Preferably, the control tube is provided with a steam or cold water inlet, a venturi tube, and a temperature detection port, with the venturi tube located between the steam or cold water inlet and the temperature detection port.

[0007] Preferably, the feeding pipe is provided with an alkali feed port, an acid feed port and two distributors. The alkali feed port and the acid feed port are both inclined in the direction of fluid flow, and the two distributors are located behind the alkali feed port and the acid feed port, respectively.

[0008] Preferably, both the feed tube and the reaction tube are equipped with several laminar flow disruptors.

[0009] Preferably, the sampling tube is equipped with a sampling device, a pH detection port, and a temperature detection port.

[0010] In summary, this utility model achieves the following technical effects:

[0011] This invention relates to a continuous synthesis apparatus for precipitated silica, which enables continuous synthesis of precipitated silica. The apparatus has a simple structure and can be installed outdoors. Furthermore, by selecting the number of synthesis tubes and the particle size filter plates, it is possible to synthesize silica with different pore volumes and particle size requirements, and control the particle size distribution within a narrow range. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the synthesis apparatus for the continuous preparation of precipitated silica according to this utility model;

[0013] Explanation of the markings on the attached diagrams: 1. Synthetic water inlet; 2. Steam or cold water feed port; 3. Temperature detection port; 4. Venturi tube; 5. Alkali feed port; 6. Acid feed port; 7. Distributor; 8. Laminar flow disruptor; 9. Particle size filter plate; 10. Sampling device; 11. pH detection port; 12. Silica suspension outlet. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings.

[0015] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0016] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] Example 1:

[0021] A synthesis apparatus for the continuous preparation of precipitated silica includes a control tube and a synthesis pipeline. One end of the control tube is provided with a synthesis water inlet 1, and the other end of the control tube is connected to one end of the synthesis pipeline. The other end of the synthesis pipeline is provided with a silica suspension outlet 12. The synthesis pipeline is composed of several synthesis tubes connected in series or in parallel. The synthesis tube includes a feeding tube, a reaction tube, and a sampling tube. The reaction tube is located between the feeding tube and the sampling tube. Particle size filter plates 9 are provided between the feeding tube and the reaction tube and between the reaction tube and the sampling tube.

[0022] The particle size filter plate 9 is used to limit the particle size of silica, and the appropriate size can be selected according to the requirements to synthesize a particle size distribution that meets the product requirements; adjacent synthesis pipes are connected by flange joints, and the synthesis pipes are connected to the control pipe liquid by flange joints.

[0023] The continuous synthesis apparatus for precipitated silica in this embodiment can continuously synthesize precipitated silica. The apparatus has a simple structure and can be installed outdoors. Furthermore, by selecting the number of synthesis tubes and the particle size filter plate 9, silica with different pore volumes and particle size requirements can be synthesized, and the particle size distribution can be controlled within a narrow distribution range.

[0024] The control tube is equipped with a steam or cold water inlet 2, a venturi tube 4 and a temperature detection port 3, with the venturi tube 4 located between the steam or cold water inlet 2 and the temperature detection port 3; the sampling tube is equipped with a sampling device 10, a pH detection port and a temperature detection port 3.

[0025] A temperature sensor is inserted into the temperature detection port 3 to monitor the fluid pattern in the control tube and sampling tube in real time. An online pH meter is installed in the pH detection port to monitor the pH value of the fluid in the sampling tube in real time. The sampling device 10 is connected in parallel to the sampling tube for convenient sampling and testing. The Venturi tube 4 generates the Venturi effect by reducing the cross-section of the fluid channel to accelerate the flow rate and form a low-pressure zone to adsorb the surrounding medium, thereby allowing steam or cold water to mix fully with the synthetic water, thus regulating the temperature of the synthetic water.

[0026] The feeding pipe is equipped with an alkali inlet 5, an acid inlet 6, and two distributors 7. The alkali inlet 5 and the acid inlet 6 are both inclined towards the direction of fluid flow, and the two distributors 7 are located behind the alkali inlet 5 and the acid inlet 6, respectively. Several laminar flow disruptors 8 are provided in both the feeding pipe and the reaction pipe. The acid and alkali are injected into the feeding pipe according to the synthesis formula ratio, and the distributors 7 are used to achieve uniform dispersion to the synthesis water. The laminar flow disruptors 8 interfere with the stable laminar flow of the fluid through physical structure. They are usually installed inside pipes, reactors, or equipment, and use obstacles, blades, grids, etc. to generate eddies or disturbances to achieve the effect of uniform mixing.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A synthesis apparatus for the continuous preparation of precipitated silica, characterized in that, The system includes a control tube and a synthesis pipeline. One end of the control tube is provided with a synthesis water inlet, and the other end of the control tube is connected to one end of the synthesis pipeline. The other end of the synthesis pipeline is provided with a silica suspension outlet. The synthesis pipeline is composed of several synthesis tubes connected in series or in parallel. The synthesis pipeline includes a feeding tube, a reaction tube, and a sampling tube. The reaction tube is located between the feeding tube and the sampling tube. Particle size filter plates are provided between the feeding tube and the reaction tube and between the reaction tube and the sampling tube.

2. The apparatus for continuous preparation of precipitated silica according to claim 1, characterized in that, The control tube is equipped with a steam or cold water inlet, a venturi tube, and a temperature detection port, with the venturi tube located between the steam or cold water inlet and the temperature detection port.

3. The apparatus for continuous preparation of precipitated silica according to claim 1, characterized in that, The feeding pipe is equipped with an alkali feed port, an acid feed port, and two distributors. The alkali feed port and the acid feed port are both inclined in the direction of fluid flow, and the two distributors are located behind the alkali feed port and the acid feed port, respectively.

4. The apparatus for continuous preparation of precipitated silica according to claim 1, characterized in that, Both the feed pipe and the reaction pipe are equipped with several laminar flow disruptors.

5. The apparatus for continuous preparation of precipitated silica according to claim 1, characterized in that, The sampling tube is equipped with a sampling device, a pH detection port, and a temperature detection port.

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