Continuous production system for preparing white carbon black and silica gel by enhanced mass transfer carbonization method

Abstract

The utility model relates to the field of white carbon black and silica gel, in particular to a continuous production system for preparing white carbon black and silica gel by an enhanced mass transfer carbonization method. Comprising a circular reaction separator, a circulating pump, a gas-liquid mixer, a mixed reaction pump, a temperature-controllable reactor and a mixer, the mixer is respectively communicated with the reaction kettle, the stock solution inlet and the circulating pump through pipelines; the gas-liquid mixer comprises a carbon dioxide inlet pipe, a mixed liquid inlet and a mixing chamber, the mixed liquid inlet is communicated with the circulating pump, the mixing chamber is communicated with the mixed reaction pump, the mixed reaction pump is connected to the temperature-controllable reactor, and the temperature-controllable reactor is connected to the reaction kettle. Carbon dioxide is deeply subjected to gas-liquid chemical reaction for multiple times, so that the reaction speed of carbon dioxide gas and a sodium silicate solution is increased, the absorption rate of carbon dioxide is increased to more than 98.5%, and the conversion rate of silicon dioxide in sodium silicate is increased to more than 98% from the original 75%.

Description

Technical Field

[0001] The utility model relates to the fields of silica white and silica gel, and particularly relates to a continuous production system for preparing silica white and silica gel by an enhanced mass transfer carbonization method. Background Art

[0002] The component of silica white is SiO2, and the molecular formula is SiO2·nH2O. It appears as a white, highly dispersed amorphous powder or flocculent powder, is light in weight, porous, heat-resistant, non-combustible, and has good electrical insulation performance. Its chemical properties are relatively stable, showing inertness to many chemical substances, with a relative density of 2.3 - 2.5 and a melting point of 1750°C. Silica white has a wide range of uses in many aspects of the national economy.

[0003] Silica gel is an adsorption material with a microporous structure. Its chemical components are SiO2 and a certain amount of structural water, and the content of structural water varies with the specific surface area. Silica gel is a series of products, that is, different microporous structures, specific surface areas, and void volumes, so its application fields are different.

[0004] The production process of producing silica white and silica gel by the carbonization method involves raw material carbon dioxide, and it is necessary to fully chemically react carbon dioxide with the solution. However, the current methods mainly rely on mechanical stirring and compressed air stirring, and cannot achieve good reaction effects. Content of the Utility Model

[0005] In order to achieve better reaction effects, the utility model provides a continuous production system for preparing silica white and silica gel by an enhanced mass transfer carbonization method.

[0006] The utility model is realized through the following technical solutions: A continuous production system for preparing silica white and silica gel by an enhanced mass transfer carbonization method includes a circulating reaction separator, a circulating pump, a gas-liquid mixer, a mixing reaction pump, a temperature-controlled reactor, and a mixer;

[0007] The circulating reaction separator includes a power device, a reaction kettle, a hollow shaft sleeve, and dispersion blades; the power device is arranged outside the reaction kettle, the hollow shaft sleeve and the dispersion blades are arranged inside the reaction kettle, the drive shaft of the power device passes through the center of the hollow shaft sleeve movably, the lower end of the drive shaft of the power device is connected with the dispersion blades, a carbon dioxide inlet is arranged on the hollow shaft sleeve, the periphery of the blade body of the dispersion blade is communicated with the air outlet end of the hollow shaft sleeve, and a discharge port is arranged at the bottom of the reaction kettle;

[0008] The mixer is communicated with the inside of the reaction kettle, the stock solution inlet, and the liquid inlet of the circulating pump through pipelines respectively;

[0009] The gas-liquid mixer includes a carbon dioxide inlet pipe, a mixing liquid inlet, and a mixing chamber. The carbon dioxide inlet pipe and the mixing liquid inlet are respectively arranged at one end of the mixing chamber for feeding. The mixing liquid inlet is communicated with the liquid outlet of a circulation pump. One end of the mixing chamber for discharging is communicated with the liquid inlet of a mixing reaction pump. The liquid outlet of the mixing reaction pump is connected to the inlet of a temperature-controlled reactor. The outlet of the temperature-controlled reactor is connected to the feeding port of a reaction kettle through a pipeline.

[0010] As a further improvement of the technical solution of the present utility model, a spiral blade is rotatably arranged in the mixing chamber.

[0011] As a further improvement of the technical solution of the present utility model, a mother liquor return port is arranged on the reaction kettle.

[0012] As a further improvement of the technical solution of the present utility model, an exhaust valve is arranged on the reaction kettle.

[0013] As a further improvement of the technical solution of the present utility model, at least one flow stabilizing plate is arranged on the inner wall of the reaction kettle.

[0014] As a further improvement of the technical solution of the present utility model, a heating device is arranged on the wall of the reaction kettle.

[0015] A continuous production system for preparing precipitated silica and silica gel by an enhanced mass transfer carbonization method provided by the present utility model has the following advantages compared with the prior art:

[0016] Through the gas-liquid mixer, the mixing reaction pump, and the circulation reaction separator, the present utility model enables carbon dioxide to undergo gas-liquid chemical reactions deeply for multiple times, improves the reaction rate between carbon dioxide gas and sodium silicate solution, increases the absorption rate of carbon dioxide to more than 98.5%, and raises the conversion rate of silicon dioxide in sodium silicate from the original 75% to more than 98%. Moreover, excellent reaction conditions can be formed in the circulation reaction separator to achieve the best acid-base reaction effect. The problem of product quality stability in the production of precipitated silica and silica gel by the carbonization method is solved through the circulation reaction separator, and the production cost is reduced. Description of the Drawings

[0017] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present utility model, and are used together with the specification to explain the principle of the present utility model.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Schematic diagram showing the results of a continuous production system for preparing precipitated silica and silica gel by an enhanced mass transfer carbonization method.

[0020] In the figure: 1 - Circulation reaction separator, 101 - Power device, 102 - Reaction kettle, 103 - Hollow shaft sleeve, 104 - Dispersion blade, 105 - Carbon dioxide inlet, 106 - Discharge port, 107 - Mother liquor return port, 108 - Exhaust valve, 109 - Flow stabilizer plate, 110 - Heating device, 2 - Circulation pump, 3 - Gas-liquid mixer, 301 - Carbon dioxide inlet pipe, 302 - Mixed liquid inlet, 303 - Mixing chamber, 304 - Spiral blade, 4 - Mixed reaction pump, 5 - Temperature-controlled reactor, 6 - Mixer. Specific embodiments

[0021] In order to more clearly understand the above objects, features and advantages of the present invention, the solution of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] The specific embodiments of the present invention will be described in detail below.

[0024] The present invention provides a continuous production system for preparing precipitated silica and silica gel by an enhanced mass transfer carbonization method, including a circulation reaction separator 1, a circulation pump 2, a gas-liquid mixer 3, a mixed reaction pump 4, a temperature-controlled reactor 5 and a mixer 6;

[0025] The circulation reaction separator 1 includes a power device 101, a reaction kettle 102, a hollow shaft sleeve 103 and a dispersion blade 104; the power device 101 is arranged outside the reaction kettle 102, the hollow shaft sleeve 103 and the dispersion blade 104 are arranged inside the reaction kettle 102, the drive shaft of the power device 101 is movably arranged through the center of the hollow shaft sleeve 103, the lower end of the drive shaft of the power device 101 is connected to the dispersion blade 104, the carbon dioxide inlet 105 is arranged on the hollow shaft sleeve 103, the periphery of the blade body of the dispersion blade 104 is communicated with the outlet end of the hollow shaft sleeve 103, and a discharge port 106 is arranged at the bottom of the reaction kettle 102;

[0026] The mixer 6 is respectively communicated with the inside of the reaction kettle 102, the raw liquid inlet and the liquid inlet of the circulation pump 2 through pipelines;

[0027] The gas-liquid mixer 3 includes a carbon dioxide inlet pipe 301, a mixed liquid inlet 302, and a mixing chamber 303. The carbon dioxide inlet pipe 301 and the mixed liquid inlet 302 are respectively arranged at one end of the mixing chamber 303 for feeding. The mixed liquid inlet 302 is communicated with the liquid outlet of the circulation pump 2. One end of the mixing chamber 303 for discharging is communicated with the liquid inlet of the mixed reaction pump 4. The liquid outlet of the mixed reaction pump 4 is connected to the inlet of the temperature-controlled reactor 5. The outlet of the temperature-controlled reactor 5 is connected to the feeding port of the reaction kettle 102 through a pipeline.

[0028] In this embodiment, as Figure 1 shown, the sodium silicate solution enters the mixer 6 from the stock solution inlet. The circulation pump 2 transports the sodium silicate solution to the mixed liquid inlet 302 of the gas-liquid mixer 3. Carbon dioxide enters the mixing chamber 303 of the gas-liquid mixer 3 from the carbon dioxide inlet pipe 301. The carbon dioxide and the sodium silicate solution are fully mixed in the gas-liquid mixer 3. By the strong action of the mixed reaction pump 4, the absorption of carbon dioxide by the sodium silicate solution is promoted. It enters from the tube side inlet of the temperature-controlled reactor 5, and steam is introduced into the shell side of the temperature-controlled reactor 5 for heat exchange. The materials in the temperature-controlled reactor 5 are heated to the reaction temperature. The carbon dioxide and the sodium silicate solution react in the temperature-controlled reactor 5 (to make the conversion rate of silicon dioxide in sodium silicate reach 70 - 75%). The reaction product (gas-liquid mixture) enters the circulation reaction separator 1 through a pipeline. The drive shaft of the power device 101 rotates at a high speed in the hollow shaft sleeve 103. Due to the strong drive of the dispersion blades 104, the unreacted carbon dioxide in the gas-liquid mixture in the circulation reaction separator 1 overflows. Due to the high-speed rotation of the drive shaft, a negative pressure is formed inside the hollow shaft sleeve 103. Carbon dioxide enters the inside of the hollow shaft sleeve 103 from the carbon dioxide inlet 105, and then is broken into tiny gas particles under the action of the dispersion blades 104, enabling the carbon dioxide to react rapidly with the unreacted sodium silicate, and multiple gas-liquid chemical reactions occur. The carbonization reaction is completed instantaneously, greatly improving the reaction efficiency, shortening the reaction time, and ensuring the uniform particle size of the product. At this time, the conversion rate of silicon dioxide in sodium silicate is increased to more than 90 - 98%. The qualified product (white carbon black or silica gel) after the carbonization reaction is discharged from the discharge port 106. The product that does not meet the relevant requirements after the carbonization reaction is recycled into the mixer 6. The sodium silicate solution is supplemented into the mixer 6 through the stock solution inlet and reacts again through the circulation pump 2 until a qualified product is obtained in the circulation reaction separator 1. In this embodiment, the preparation of white carbon black or silica gel products can be achieved by adjusting the temperature and raw material ratio in each reaction stage.

[0029] In this embodiment, a spiral blade 304 is rotatably arranged in the mixing chamber 303. Carbon dioxide enters the mixing chamber 303 of the gas-liquid mixer 3 through the carbon dioxide inlet pipe 301, and the carbon dioxide gas flow drives the spiral blade 304 to rotate, so that carbon dioxide and sodium silicate solution are fully mixed in the gas-liquid mixer 3.

[0030] In one embodiment, as Figure 1 shown, a mother liquor return port 107 is provided on the reactor 102. Qualified products (white carbon black or silica gel) after the carbonization reaction are discharged from the discharging port 106, and the discharged materials are further subjected to solid-liquid separation to achieve product refinement. The liquid mother liquor after pressure filtration returns to the reactor 102 through the mother liquor return port 107 to realize recycling.

[0031] Furthermore, an exhaust valve 108 is provided on the reactor 102. The function of the exhaust valve 108 is to discharge the non-condensable gas in the tank and balance the air pressure in the tank.

[0032] In one embodiment, at least one flow stabilizer plate 109 is provided on the inner wall of the reactor 102. The flow stabilizer plate 109 is arranged vertically, and its function is to prevent the liquid from fluctuating violently. The flow stabilizer plate 109 includes a plate body main body.

[0033] Furthermore, a heating device 110 is provided on the wall of the reactor 102. The heating device 110 includes: an electric heating wire, or a steam coil, or a jacketed steam heater.

[0034] The above are only specific embodiments of the present invention, which enable those skilled in the art to understand or implement the present invention. Although the foregoing embodiments have been described in detail, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A continuous production system for preparing precipitated silica and silica gel by an enhanced mass transfer carbonization method, characterized in that, It includes a circulating reaction separator (1), a circulating pump (2), a gas-liquid mixer (3), a mixed reaction pump (4), a temperature-controlled reactor (5) and a mixer (6); The circulating reaction separator (1) includes a power device (101), a reaction kettle (102), a hollow shaft sleeve (103), and dispersion vanes (104); the power device (101) is arranged outside the reaction kettle (102), the hollow shaft sleeve (103) and the dispersion vanes (104) are arranged inside the reaction kettle (102), the drive shaft of the power device (101) passes through the center of the hollow shaft sleeve (103) movably, the lower end of the drive shaft of the power device (101) is connected to the dispersion vanes (104), a carbon dioxide inlet (105) is arranged on the hollow shaft sleeve (103), the periphery of the blade body of the dispersion vanes (104) is communicated with the air outlet end of the hollow shaft sleeve (103), and a discharge port (106) is arranged at the bottom of the reaction kettle (102); The mixer (6) is communicated with the inside of the reaction kettle (102), the stock solution inlet and the liquid inlet of the circulating pump (2) through pipelines respectively; The gas-liquid mixer (3) includes a carbon dioxide inlet pipe (301), a mixed liquid inlet (302) and a mixing chamber (303). The carbon dioxide inlet pipe (301) and the mixed liquid inlet (302) are respectively arranged at one end of the mixing chamber (303) for feeding. The mixed liquid inlet (302) is communicated with the liquid outlet of the circulating pump (2). The discharging end of the mixing chamber (303) is communicated with the liquid inlet of the mixed reaction pump (4). The liquid outlet of the mixed reaction pump (4) is connected to the inlet of the temperature-controlled reactor (5). The outlet of the temperature-controlled reactor (5) is connected to the feeding port of the reaction kettle (102) through a pipeline.

2. The continuous production system for preparing white carbon black and silica gel by the enhanced mass transfer carbonization method according to claim 1, wherein, A spiral blade (304) is rotatably arranged in the mixing chamber (303).

3. A continuous production system for preparing white carbon black and silica gel by an enhanced mass transfer carbonization method according to claim 1, characterized in that, A mother liquor return port (107) is arranged on the reaction kettle (102).

4. A continuous production system for preparing precipitated silica and silica gel by an enhanced mass transfer carbonization method according to claim 1, characterized in that, An exhaust valve (108) is arranged on the reaction kettle (102).

5. A continuous production system for preparing precipitated silica and silica gel by an enhanced mass transfer carbonization method according to claim 1, characterized in that, At least one flow stabilizing plate (109) is arranged on the inner wall of the reaction kettle (102).

6. The continuous production system for preparing white carbon black and silica gel by the enhanced mass transfer carbonization method according to claim 1, characterized in that, A heating device (110) is arranged on the wall of the reaction kettle (102).

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