CN111137900A - Novel totally enclosed reactor for manufacturing fumed silica - Google Patents
Novel totally enclosed reactor for manufacturing fumed silica Download PDFInfo
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- CN111137900A CN111137900A CN202010162346.7A CN202010162346A CN111137900A CN 111137900 A CN111137900 A CN 111137900A CN 202010162346 A CN202010162346 A CN 202010162346A CN 111137900 A CN111137900 A CN 111137900A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 229910021485 fumed silica Inorganic materials 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 239000002994 raw material Substances 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims description 77
- 238000001816 cooling Methods 0.000 claims description 36
- 239000002826 coolant Substances 0.000 claims description 22
- 239000011229 interlayer Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- 239000000376 reactant Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 18
- 239000000377 silicon dioxide Substances 0.000 description 12
- 239000000567 combustion gas Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000000843 powder Substances 0.000 description 8
- 229910052681 coesite Inorganic materials 0.000 description 7
- 229910052906 cristobalite Inorganic materials 0.000 description 7
- 229910052682 stishovite Inorganic materials 0.000 description 7
- 229910052905 tridymite Inorganic materials 0.000 description 7
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000005049 silicon tetrachloride Substances 0.000 description 6
- 239000012808 vapor phase Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- JLUFWMXJHAVVNN-UHFFFAOYSA-N methyltrichlorosilane Chemical compound C[Si](Cl)(Cl)Cl JLUFWMXJHAVVNN-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000005046 Chlorosilane Substances 0.000 description 3
- UQMRAFJOBWOFNS-UHFFFAOYSA-N butyl 2-(2,4-dichlorophenoxy)acetate Chemical compound CCCCOC(=O)COC1=CC=C(Cl)C=C1Cl UQMRAFJOBWOFNS-UHFFFAOYSA-N 0.000 description 3
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910003910 SiCl4 Inorganic materials 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910003822 SiHCl3 Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 1
- LIKFHECYJZWXFJ-UHFFFAOYSA-N dimethyldichlorosilane Chemical compound C[Si](C)(Cl)Cl LIKFHECYJZWXFJ-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 description 1
- 235000013923 monosodium glutamate Nutrition 0.000 description 1
- 239000004223 monosodium glutamate Substances 0.000 description 1
- 239000011858 nanopowder Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
- C01B33/181—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process
- C01B33/183—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process by oxidation or hydrolysis in the vapour phase of silicon compounds such as halides, trichlorosilane, monosilane
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention provides a novel totally-enclosed reactor for manufacturing fumed silica, which solves the problems that the reactor is an open type combustor and a reactor body are separated, and the reaction is easily influenced by the external environment. The device comprises a combustor, a reactor body and an ignition device, wherein a raw material inlet and a nozzle are arranged at two ends of a cavity of the combustor, at least a nozzle part of the combustor extends into an inner cavity of the reactor body from one end of the reactor body so as to enable the combustor and the reactor body to form an integrated closed structure, and a reaction outlet is arranged at the other end of the reactor body; an ignition device is disposed proximate the nozzle for igniting the reactant feedstock. The burner and the reactor body form an integrated closed structure, reaction flame is not influenced by external environment and atmosphere, and impurities and moisture in air are prevented from entering a system. The reactor can avoid the possibility that the moisture in the environment is contacted with the residual materials of the system under the working or stopping state of the reactor, thereby corroding the equipment.
Description
Technical Field
The invention relates to the technical field of vapor-phase-method silicon dioxide production equipment, in particular to a novel fully-closed reactor for manufacturing vapor-phase-method silicon dioxide.
Background
Fumed silica is commonly called fumed silica, is an important nano inorganic chemical material, has small particle size (7-40 nm) and large specific surface area (50-400 m)2Per gram), high product purity (SiO)2Not less than 99.9%). The product has excellent surface chemical properties and good physiological inertia, is widely applied to the fields of silicone rubber, adhesives, paints, coatings, printing ink, electronics, paper, cosmetics, medicines, foods, agriculture and the like, mainly plays roles of reinforcement, thickening, thixotropy, extinction and the like, is an indispensable raw material and an additive in the fields of national basic civil industry, national defense industry and high technology, and is called industrial monosodium glutamate.
Basic manufacturing method of vapor-phase method silica: the gasified silicon tetrachloride or monomethyl trichlorosilane, compressed air and hydrogen are taken as raw materials, and the raw materials, the gasified silicon tetrachloride or monomethyl trichlorosilane, the compressed air and the hydrogen are fully mixed and then enter a high-temperature hydrolysis reactor (a reactor for short) to react as follows:
a：SiCl4+3H2+1.5O2→SiO2+4HCl+H2O
b：CH3SiCl3+H2+2.5O2→SiO2+3HCl+H2O+CO2
prepared SiO2Nanometer powder particles are presented in a reactor, a plurality of powder particles are combined and aggregated to form micron-sized powder particles after cooling, and the powder particles are subjected to gas-powder separation, deacidification, drying and other processes to obtain the finished product of the gas-phase-method silicon dioxide powder.
The reactor, also called a high-temperature hydrolysis reactor, is one of the key devices for manufacturing fumed silica, has very key effects on the stability, safety and product quality of fumed silica production, and generally comprises the following components: the combustor is used for injecting the raw material gas flow into the reactor at a high speed to perform high-temperature hydrolysis reaction, and is a core component for controlling reaction flame; a body for receiving a reaction product; an ignition system for starting the reactor; and a flame detection system and a cooling system for rapidly taking away the generated heat.
The applicant has found that the reactors of the prior art present at least the following technical problems:
1. the reactor is open, the existing reactor is not totally closed, and the combustor and the reactor body are separated, so that the following problems are easily caused:
firstly, the reaction flame is easily affected by the external atmospheric environment, resulting in unstable flame; secondly, the cooling process of the reaction depends on the atmospheric air flow at the opening part of the reactor body as cooling air flow, and the impurities in the atmosphere are more, so that the product quality is influenced; thirdly, in a parking state, moisture in the atmosphere enters the reactor from the opening part, so that equipment corrosion is easily caused.
2. The combustor is of a double-layer structure and only comprises an ignition gas flow channel and a reaction gas flow channel; the flame of the burner is greatly influenced by the atmospheric environment; the product index is difficult to adjust, and high-index products cannot be produced; the product index has a wide control range, such as specific surface area, and generally fluctuates within + -10% of the index value.
3. The reactor body is cooled by air cooling heat exchange at the opening and sucking atmospheric air flow by negative pressure, the reaction heat exchange is poor, and the productivity is low.
4. The ignition system is manually ignited and is unsafe to operate.
Disclosure of Invention
The invention aims to provide a novel totally-enclosed reactor for manufacturing fumed silica, which aims to solve the technical problems that the reactor in the prior art is open, a burner is separated from a reactor body, and the reaction is easily influenced by the external environment; the technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a novel totally enclosed reactor for manufacturing fumed silica, which comprises a burner, a reactor body and an ignition device, wherein:
the combustor is of a sleeve structure with a multilayer cavity, a raw material inlet and a nozzle are arranged at two ends of the cavity of the combustor, at least a nozzle part of the combustor extends into an inner cavity of the reactor body from one end of the reactor body so as to enable the combustor and the reactor body to form an integrated closed structure, and a reaction outlet is arranged at the other end of the reactor body;
the ignition device is arranged close to the nozzle and used for igniting the reaction raw materials.
Preferably, the central axis of the burner is arranged in line with the central axis of the reactor body.
Preferably, the multilayer sleeve of the burner sequentially comprises a first cavity with the raw material inlet, a second cavity with the ignition gas inlet, a third cavity with the combustion assisting gas inlet and a fourth cavity with the adjusting gas inlet from inside to outside, and the first cavity, the second cavity, the third cavity and the fourth cavity are all communicated with the nozzle.
Preferably, the nozzle is detachably connected to an outlet end of the burner, and the nozzle includes, from inside to outside, a plurality of layers of injection passages respectively communicating with the first cavity, the second cavity, the third cavity, and the fourth cavity.
Preferably, a spiral turbulent mixer is arranged in the first cavity to fully mix raw material gases entering from the raw material inlet.
Preferably, the side walls of the second, third and fourth cavities are vertically provided with pipes so as to provide corresponding gas inlets.
Preferably, the side wall of the inlet end of the reactor body is also provided with a cooling conveying gas inlet.
Preferably, a gas flow distributor is arranged at a position between the cooling conveying gas inlet and the nozzle to prevent gas turbulence.
Preferably, the reactor further comprises a cooling system, the cooling system comprising:
the cooling shell is sleeved on the periphery of the reactor body, and a cooling medium interlayer is formed between the cooling shell and the reactor body inside the cooling shell; and a cooling medium inlet and a cooling medium outlet which are communicated with the cooling medium interlayer are arranged at the two end parts of the cooling shell.
Preferably, a flame detector and a temperature detector are further arranged on the reactor body near the ignition device to monitor the flame state.
Compared with the prior art, the novel totally-enclosed reactor for manufacturing the gas-phase method silicon dioxide has the following beneficial effects: at least a nozzle part of the burner is arranged in the inner cavity of the reactor body and forms an integrated closed structure, and raw material gas enters the burner from a raw material inlet and is sprayed into the reactor body through the nozzle and ignited; the reaction flame is not affected by the external environment and the atmosphere, and impurities and moisture in the air are prevented from entering the system. The reactor can avoid the possibility that the moisture in the environment is contacted with the residual materials of the system under the working or stopping state of the reactor, thereby corroding the equipment. The reaction flame in the reactor with the structure is stable, and the equipment period of the device is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of a novel fully enclosed reactor for making fumed silica;
FIG. 2 is a structural side view of the reactor;
in the figure: 100. a support; 1. a burner; 11. a nozzle; 2. a reactor body; 21. a reaction outlet; 3. an ignition device; 40. cooling the shell; 41. a cooling medium interlayer; 42. a cooling medium inlet; 43. a cooling medium outlet; 5. a turbulent flow mixer; 6. a spoiler is prevented; 7. an air flow distributor; 8. an adjusting washer; 9. a flame detector; 10. an inspection opening;
n1, raw material inlet; n2, reactive combustion gas inlet; n3, ignition gas inlet; n4, a combustion-supporting gas inlet; n5, regulated gas inlet; n6, cooling conveying gas inlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the equipment or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example 1
Referring to fig. 1 and 2, fig. 1 is a schematic structural view of a novel fully enclosed reactor for manufacturing fumed silica; FIG. 2 is a structural side view of the reactor;
the present embodiment provides a novel totally enclosed reactor for manufacturing fumed silica, comprising a burner 1, a reactor body 2 and an ignition device 3, wherein:
the combustor 1 adopts a multi-layer sleeve structure, a raw material inlet N1 and a nozzle 11 are arranged at two ends of a cavity of the combustor 1, at least part of the nozzle 11 of the combustor 1 extends into an inner cavity of the reactor body 2 from one end of the reactor body 2 so that the combustor 1 and the reactor body 2 form an integrated closed structure, and a reaction outlet 21 is arranged at the other end of the reactor body 2;
an ignition device 3 is provided near the nozzle for igniting the reaction raw material. The ignition device 3 can realize automatic ignition by adopting the existing automatic ignition gun, and is safe and convenient.
The material of the reactor can be nickel alloy, titanium alloy, aluminum alloy and the like. The reactor body may be installed vertically or horizontally and supported by the support 100.
The reactor body mainly provides reaction space, reaction heat exchange, reaction material receiving and conveying and the like.
The reactor of the embodiment comprises a burner 1 and a reactor body 2 which are integrated, wherein at least a nozzle 11 of the burner 1 extends into the inner cavity of the reactor body 2, so that the flame of the reaction raw material gas sprayed out from the nozzle 11 is not affected by the outside air after the reaction raw material gas is ignited by an ignition device 3, and impurities and moisture in the air are prevented from entering the system. The reactor can avoid the possibility that the moisture in the environment is contacted with the residual materials of the system under the working or stopping state of the reactor, thereby corroding the equipment.
As an alternative embodiment, the central axis of the burner 1 is arranged in line with the central axis of the reactor body 2.
The arrangement mode can ensure that the raw material gas and the like can be uniformly sprayed out from the nozzle and fully react in the inner cavity of the reactor body 2.
Wherein, the above-mentioned gas phase method silica reaction is carried out in the inner cavity of the reactor body 2, and the reaction raw materials can adopt: silicon tetrachloride, trichlorosilane, monomethyltrichlorosilane, dichlorosilane, dimethyldichlorosilane, or the like; the reaction principle is as follows:
SiCl4+3H2+1.5O2→SiO2+4HCl+H2O
SiHCl3+2H2+1.5O2→SiO2+3HCl+H2O
CH3SiCL3+H2+2.5O2→SiO2+3HCl+H2O+CO2
H2SiCl2+H2+1.5O2→SiO2+2HCl+H2O
taking silicon tetrachloride as an example, the silicon tetrachloride enters the combustor 1 from a raw material inlet, mixed hydrogen, oxygen and the like are ejected at a high speed at a nozzle and ignited, and the mixed hydrogen, the oxygen and the like are fully reacted in an inner cavity of the reactor body 2 and then discharged through the reaction outlet 21.
In the preparation process of the gas phase method, reaction combustion gas and combustion-supporting gas are required to participate in the reaction; in addition, in order to facilitate ignition of gas at the nozzle and adjustment of product indexes, ignition gas, adjustment gas for adjusting the proportion of reaction raw materials and the like are required to be supplemented in the phase reaction; in the prior art, gas is introduced into an open reactor through a pipeline for reaction, the gas is easy to be lost into the external atmosphere in the mode, the flow of the gas is difficult to control, the product index is difficult to adjust in actual production, high-index products cannot be produced, and the index value generally fluctuates within +/-10%.
In order to solve the above problems, in this embodiment, a combustor 1 with a new structure is provided, as shown in fig. 1 and fig. 2, the combustor 1 in this embodiment is a sleeve structure with multiple layers of cavities, which is convenient for arranging other multiple layers of airflow channels, for example, the combustor sequentially includes, from inside to outside, a first cavity with a raw material inlet, a second cavity with an ignition gas inlet, a third cavity with a combustion-supporting gas inlet, and a fourth cavity with a regulating gas inlet, and the first cavity, the second cavity, the third cavity, and the fourth cavity are all communicated with a nozzle 11.
The multilayer sleeve structure can prevent the ignition gas flow channel, the adjusting gas channel, the combustion-supporting gas channel and the like from contacting with the outside to influence flame, and is convenient for adjusting the gas flow.
Wherein, the raw materials in the first cavity are as follows: silicon tetrachloride, hydrogen (as a reactive combustion gas); the ignition gas in the second cavity is: hydrogen, natural gas, ethane, propane, and the like. Preferred ignition gases are hydrogen and natural gas. The combustion-supporting gas in the third cavity is as follows: air or oxygen. Air is generally used, and oxygen can be used when certain special white carbon black products are manufactured. The conditioning gas in the fourth chamber is air.
As an alternative embodiment, referring to fig. 1, the nozzle 11 is detachably connected to the outlet end of the combustor 1, and the nozzle includes, from inside to outside, a plurality of layers of injection passages respectively communicating with the first cavity, the second cavity, the third cavity, and the fourth cavity.
Specifically, the nozzle can be connected with the outlet end of the combustor 1 in a threaded connection mode, and when the nozzle is damaged, the nozzle can be detached and replaced. Referring to fig. 1, a spacer washer 8 is provided between the inlet end of the nozzle and the outlet end of the burner 1 for adjusting the distance of the bottom edge of the sleeve. The flame stabilization can be ensured by arranging a turbulence preventing device 6 in the barrel cavity at the joint of the burner 1 and the nozzle 11.
Combustor 1 in this embodiment adopts the telescopic structure of multilayer, and nozzle 11 adopts the multilayer to spout the structure of establishing of way cover, lets in combustor 1 with gas many times, wherein: primary gas: reaction raw material and reaction combustion gas secondary gas: combustion-supporting gas tertiary gas: an ignition gas; four times of gas: the gas is conditioned.
In other words, in the burner structure with the multi-layer sleeve, one of the burner structures can enable gas media such as chlorosilane, reaction combustion gas, ignition gas, combustion-supporting gas, adjusting gas and the like to enter the reactor body 2 through different cavities, so that reaction flame is protected, and the reaction is more stable; and secondly, the product brand is easy to adjust, and high-grade products with high ratio tables can be produced. Thirdly, the product index is stable, such as the specific surface area, and generally fluctuates within +/-3% of the index value.
As an alternative embodiment, a spiral turbulent mixer 5 is arranged in the first cavity to fully mix raw material gases entering from the raw material inlet.
Specifically, the gas in the first cavity is fully mixed by a spiral turbulent mixer 5 in the spraying group, and is sprayed out of the nozzle at a high speed, wherein the spraying speed is controlled to be 20-100 m/s. Wherein above-mentioned spiral vortex blender 5 is current device, does not describe here its structure again, and its principle utilizes inside spiral blade to mix the gas that flows.
The reaction temperature is controlled to be 1200-2200 ℃, and the reaction temperature and the product grade are controlled by using the reaction combustion gas and the adjusting gas, so that fine adjustment and control are realized.
Performing high-temperature combustion hydrolysis reaction at the nozzle of the reactor to generateThe particle size of the primary powder is 7-70 nm, and the specific surface area of the powder is as high as 80-400 m2And/g, the nano powder can be gathered under the action of molecular force through subsequent measures of conveying, cooling and the like to form the fumed silica powder with a 20um porous three-dimensional network structure.
In order to facilitate the above-mentioned multiple times of gas to be introduced into the combustor 1 in a closed manner, as an alternative embodiment, pipelines are vertically arranged on the side walls of the second cavity, the third cavity and the fourth cavity so as to facilitate the arrangement of corresponding gas inlets.
Specifically, referring to fig. 1, an ignition gas inlet N3 is arranged on a pipeline perpendicular to the second cavity, a combustion-supporting gas inlet N4 is arranged on a pipeline perpendicular to the third cavity, and a regulating gas inlet N5 is arranged on a pipeline perpendicular to the fourth cavity; in order to facilitate the control of the flow rates of the chlorosilane and the reactive combustion gas, preferably, the chlorosilane and the reactive combustion gas (hydrogen) are respectively introduced into the burner 1, and a vertical pipe with a reactive combustion gas inlet N2 is arranged on the side wall of the first chamber.
In order to control the reaction temperature at the nozzle, as an alternative embodiment, a cooling feed gas inlet N6 is further provided on the inlet end side wall of the reactor body 2.
Referring to fig. 1, the cooling transport gas may be air, nitrogen, or the like, as a five-time gas. Generally air, and nitrogen can be used when certain special white carbon black products are manufactured. The conveying channel is a cavity between the inner wall of the reactor body 2 and the outer wall of the combustor 1, as shown in fig. 1. The cooling temperature of the reaction mass can be precisely controlled by forced gas cooling and transport through cooled transport gas channels on the burner 1 and the reactor body 2.
As an alternative embodiment, as shown in fig. 1, a gas flow distributor 7 is provided at a position between the cooling delivery gas inlet N6 and the nozzle 11 to prevent gas turbulence. The air distributor 7 is well known in the art and will not be described herein.
Example 2
In the prior art, a reactor is used for high-temperature reaction, and an air cooling heat exchange mode is usually adopted for heat dissipation of the reactor, but the reaction heat exchange is poor and the productivity is low. In order to solve the above problem, the reactor of the present embodiment further includes a cooling system, the cooling system including:
a cooling shell 40 sleeved on the periphery of the reactor body 2, and a cooling medium interlayer 41 is formed between the cooling shell 40 and the reactor body 2 inside; both end portions of the cooling shell 40 are provided with a cooling medium inlet 42 and a cooling medium outlet 43 communicating with the cooling medium interlayer 41.
The cooling medium may be: air, water, frozen saline and glycol refrigerating fluid. Preferably the cooling medium is water or chilled brine.
In the embodiment, water cooling heat exchange is adopted, the cooling medium is positioned in the cooling medium interlayer 41, heat emitted by high-temperature hydrolysis reaction can be taken away, the heat exchange effect is good, the efficiency is high, and the productivity of the reactor can be greatly improved.
Preferably, the cooling medium inlet 42 is located at the outlet end of the reactor body 2, and the cooling medium inlet 42 is located at the inlet end of the reactor body 2, in other words, the flow direction of the cooling medium is opposite to the flow direction of the reaction gas, so that the heat exchange effect can be further improved.
By adopting the cooling system with the structure, the heat exchange effect is good, the productivity of the reactor is greatly improved, and the yield of a single reactor is improved to 10000 tons/year from 1000 to 2000 tons/year to the maximum.
In order to detect the reaction condition, as an alternative embodiment, referring to fig. 1 and 2, a flame detector 9 and a temperature detector are further disposed on the reactor body 2 near the ignition device 3 to monitor the flame condition, and an inspection port 10 is disposed on the reactor body for convenient observation. The setting can realize remote monitoring of flame state, fault interlocking is realized, and flame extinguishment can start interlocking and stop at the first time.
The present reaction structure and principles apply equally: the manufacture of products such as vapor-phase titanium dioxide (commonly known as vapor titanium dioxide), vapor-phase ferric oxide, vapor-phase aluminum oxide, vapor-phase zirconium oxide, vapor-phase zinc oxide and the like.
The particular features, structures, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A novel totally enclosed reactor for manufacturing fumed silica, comprising a burner, a reactor body and an ignition device, wherein:
the combustor is of a sleeve structure with a multilayer cavity, a raw material inlet and a nozzle are arranged at two ends of the cavity of the combustor, at least a nozzle part of the combustor extends into an inner cavity of the reactor body from one end of the reactor body so as to enable the combustor and the reactor body to form an integrated closed structure, and a reaction outlet is arranged at the other end of the reactor body;
the ignition device is arranged close to the nozzle and used for igniting the reaction raw materials.
2. The novel totally enclosed reactor for manufacturing fumed silica according to claim 1, wherein the central axis of the burner is disposed collinear to the central axis of the reactor body.
3. The novel totally enclosed reactor for manufacturing fumed silica according to claim 1 or 2, wherein the multilayer sleeve of the burner comprises, from inside to outside, in sequence, a first cavity in which the raw material inlet is present, a second cavity in which the ignition gas inlet is present, a third cavity in which the combustion assisting gas inlet is present, and a fourth cavity in which the adjusting gas inlet is present, and the first cavity, the second cavity, the third cavity, and the fourth cavity are all communicated with the nozzle.
4. The novel totally enclosed reactor for manufacturing fumed silica according to claim 3, wherein said nozzle is detachably connected to the outlet end of said burner, and said nozzle comprises, from inside to outside, a plurality of layers of injection channels respectively communicating with said first, second, third and fourth cavities.
5. The novel totally enclosed reactor for manufacturing fumed silica according to claim 3, wherein a helical turbulent mixer is disposed within said first chamber to thoroughly mix the feedstock gases entering from said feedstock inlet.
6. The novel totally enclosed reactor for manufacturing fumed silica according to claim 3, wherein the side walls of said second, third and fourth cavities are vertically provided with pipes for facilitating the arrangement of the respective gas inlets.
7. The novel totally enclosed reactor for manufacturing fumed silica according to claim 3, wherein the inlet end side wall of the reactor body is further provided with a cooling conveying gas inlet.
8. The novel fully enclosed reactor for manufacturing fumed silica according to claim 7, wherein a gas flow distributor is provided at a location between said cooling delivery gas inlet and said nozzle to prevent gas turbulence.
9. The novel fully enclosed reactor for making fumed silica according to claim 1, further comprising a cooling system comprising:
the cooling shell is sleeved on the periphery of the reactor body, and a cooling medium interlayer is formed between the cooling shell and the reactor body inside the cooling shell; and a cooling medium inlet and a cooling medium outlet which are communicated with the cooling medium interlayer are arranged at the two end parts of the cooling shell.
10. The novel totally enclosed reactor for manufacturing fumed silica according to claim 1, wherein a flame detector and a temperature detector are further disposed on said reactor body near said ignition device to monitor the flame status.
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Citations (2)
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| CN101941707A (en) * | 2010-03-11 | 2011-01-12 | 赤峰盛森硅业科技发展有限公司 | Preparation method and device of fumed silica by combustion of small molecular alkane |
| CN211813462U (en) * | 2020-03-10 | 2020-10-30 | 郑州格矽科技发展有限公司 | Novel totally enclosed reactor for manufacturing fumed silica |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101941707A (en) * | 2010-03-11 | 2011-01-12 | 赤峰盛森硅业科技发展有限公司 | Preparation method and device of fumed silica by combustion of small molecular alkane |
| CN211813462U (en) * | 2020-03-10 | 2020-10-30 | 郑州格矽科技发展有限公司 | Novel totally enclosed reactor for manufacturing fumed silica |
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