Production system for manufacturing high-purity silicon dioxide by using silane gas

Abstract

The utility model relates to the field of chemical industry, in particular to a production system for manufacturing high-purity silicon dioxide by using silane gas, which comprises a reactor, a gas-phase silica generator, a gas-phase silica generator, a gas-phase silica generator and a gas-phase silica generator, and is characterized in that the reactor is used for reacting required gas raw materials to generate gas-phase silica; the at least one aggregation device is used for aggregating the fumed silica generated by the reactor to form a required particle size; the at least one filter is used for carrying out gas-solid separation on the gas-phase white carbon black material discharged from the gathering equipment; the at least one drying device is used for drying the white carbon black powder filtered by the filter so as to remove water attached to the surface of the white carbon black powder; the at least one cooling device is used for cooling the gas discharged from the filter; according to the invention, continuous and stable production of high-performance and high-quality fumed silica with special purposes can be realized, and the requirements of the production process on materials and structures of equipment, pipelines and the like are reduced.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a production system for manufacturing high-purity silicon dioxide by utilizing silane gas. Background Art

[0002] With the continuous development of economy, industrial production has also developed rapidly, and the demand for high-performance fumed silica has also increased. Traditional fumed silica is mostly produced by high-temperature hydrolysis of chlorosilane in a hydrogen-oxygen flame. In this method, the flame temperature is high and more hydrogen chloride gas is generated, which leads to problems such as reactor material requirements and complex structure. A large amount of hydrogen chloride is also attached to the surface of the obtained fumed silica, which requires high-temperature deacidification treatment. The deacidification equipment of silica also has the disadvantages of high material requirements and complex structure. The harmful gases generated during the production process of this method also need to be treated, which leads to increased investment and operating costs.

[0003] In response to the above problems, we use silane to produce gas phase silica. Silane directly reacts with steam to undergo hydrolysis reaction in high-flow hydrogen without the participation of hydrogen, which greatly reduces the reaction temperature and no longer produces hydrogen chloride gas. Therefore, it is no longer necessary to deacidify the gas phase silica product. During the reaction, excess steam is ensured to completely react the silane, and no harmful waste gas is produced during the reaction. This can save a lot of cost in tail gas treatment and achieve harmless treatment of tail gas from the source, which not only reduces investment costs, but also can achieve the recycling of hydrogen. At the same time, the by-product hydrogen can be provided to other devices as a reaction raw material. Utility Model Content

[0004] In view of this, the utility model provides a production system for manufacturing high-purity silicon dioxide using silane gas. The utility model adopts a higher quality raw material - silane, which can stably produce high-performance, high-quality fumed silica, while reducing the temperature of the reaction system and avoiding the generation of hydrogen chloride gas, thereby reducing the special requirements of the entire reaction system for equipment, pipelines and other materials, simplifying the reaction process, reducing the investment of the entire system, and at the same time achieving the recycling of hydrogen.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A production system for producing high-purity silicon dioxide using silane gas, comprising:

[0007] A reactor for providing the required gas raw materials to react and generate fumed silica;

[0008] At least one agglomeration device for agglomerating the fumed silica generated in the reactor into a desired particle size;

[0009] At least one filter for performing gas-solid separation on the fumed silica material coming out of the aggregation device;

[0010] At least one drying device, used to dry the white carbon black powder obtained by filtering the filter to remove the moisture attached to the surface;

[0011] at least one cooling device for cooling the gas coming out of the filter;

[0012] At least one gas storage tank is used to temporarily store the gas deep-cooled and dehydrated by the cooling equipment for later use.

[0013] Preferably, the reactor includes steam, silane and high-speed flowing hydrogen for reaction to produce gas phase silica, and the reaction principle is SiH4+H2O→SiO2+H2.

[0014] Preferably, the aggregation device is a spiral pipe, and the particles coming out of the reactor are very small and pass through the aggregation device to form white carbon black with slightly larger particles.

[0015] Preferably, the filter is a honeycomb filter, and the material coming out of the aggregation device contains hydrogen and white carbon black. The high-speed flowing gas brings the material into the honeycomb filter. After passing through the honeycomb filter, the gas enters the cooling device for cooling, and the powdered white carbon black enters the drying device for dehydration.

[0016] Preferably, the cooling device is a circulating cooling device, comprising at least one chilled water supply pipe and a chilled water return pipe.

[0017] Preferably, it also includes at least one conveying device for conveying the dried white carbon black to the finished product silo.

[0018] The beneficial effects of the utility model are:

[0019] (1) The present invention can realize continuous and stable production of high-performance, high-quality special-purpose fumed silica;

[0020] (2) The present invention reduces the requirements of the production process on the materials and structures of equipment, pipelines, etc.;

[0021] (3) The present invention eliminates the need for deacidification of white carbon black and subsequent absorption of hydrogen chloride and chlorine, thereby simplifying the process and reducing operating costs;

[0022] (4) The present invention reduces the consumption of public works such as industrial water, circulating water, and liquid caustic soda, and achieves the recycling of hydrogen;

[0023] (5) The present invention has good stability, and the automated control can achieve continuous operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the utility model system;

[0025] In the figure: 1 reactor, 2 spiral aggregation equipment, 3 honeycomb filter, 4 drying equipment, 5 cooling equipment, 6 gas storage tank. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] A production system for producing high-purity silicon dioxide using silane gas, comprising:

[0028] A reactor 1, wherein steam, silane and high-speed flowing hydrogen are introduced into the reactor 1 for reacting to generate white carbon black;

[0029] A spiral aggregation device 2, the particle size of the white carbon black coming out of the reactor 1 is very small, and needs to be formed into a larger particle size before it can enter the filter for effective filtration;

[0030] A honeycomb filter 3, wherein the high-speed flowing hydrogen transports the gas and white carbon black to the honeycomb filter 3, and the honeycomb filter 3 is used to separate the gas and the solid;

[0031] A drying device 4, wherein the white carbon black powder obtained by filtering through the honeycomb filter 3 is dried to remove the moisture attached to the surface;

[0032] A cooling device 5, the gas coming out of the honeycomb filter 3 enters the cooling device 5 and is cooled in the carrier hydrogen.

[0033] A gas storage tank 6, the cooled hydrogen enters the gas storage tank 6, and is used for the reactor 1 to pass hydrogen.

[0034] As a supplement, the above devices are connected through pipelines.

[0035] The working process of the above embodiment is as follows: steam and silane are introduced into a high-speed flowing hydrogen reactor, steam and silane react to obtain gaseous silica, the gaseous silica is aggregated and then filtered through a honeycomb filter, the silica powder obtained after filtration enters a dryer to treat the moisture attached to the surface, and after the treatment is completed, it is transported to a finished product silo for packaging, and the gas passing through the filter is cooled and then returned to the hydrogen storage tank for recycling, and the by-product hydrogen is provided to other devices as a raw material.

[0036] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A production system for producing high-purity silicon dioxide using silane gas, characterized in that: include: A reactor for providing the required gas raw materials to react and generate fumed silica; At least one agglomeration device for agglomerating the fumed silica generated in the reactor into a desired particle size; At least one filter for performing gas-solid separation on the fumed silica material coming out of the aggregation device; At least one drying device, used to dry the white carbon black powder obtained by filtering the filter to remove the moisture attached to the surface; at least one cooling device for cooling the gas coming out of the filter; At least one gas storage tank is used to temporarily store the gas deep-cooled and dehydrated by the cooling equipment for later use.

2. A production system for producing high-purity silicon dioxide using silane gas according to claim 1, characterized in that: The reactor contains steam, silane and high-speed flowing hydrogen for reaction to produce gas phase silica, and the reaction principle is SiH4+H2O→SiO2+H2.

3. A production system for producing high-purity silicon dioxide using silane gas according to claim 1, characterized in that: The gathering device is a spiral pipe.

4. A production system for producing high-purity silicon dioxide using silane gas according to claim 1, characterized in that: The filter is a honeycomb filter. After passing through the honeycomb filter, the gas enters a cooling device for cooling, and the powdered white carbon black enters a drying device for dehydration.

5. A production system for producing high-purity silicon dioxide using silane gas according to claim 1, characterized in that: The cooling device is a circulating cooling device, which at least comprises a chilled water supply pipe and a chilled water return pipe.

6. A production system for producing high-purity silicon dioxide using silane gas according to claim 1, characterized in that: It also includes at least one conveying device for conveying the dried white carbon black to a finished product silo.

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