Optical fiber grade silicon tetrachloride production device

Abstract

The utility model provides an optical fiber-grade silicon tetrachloride production device, which relates to the technical field of optical fiber-grade silicon tetrachloride production and comprises a vaporizer, a liquid-state silicon tetrachloride raw material, a liquid-state silicon tetrachloride production device and a liquid-state silicon tetrachloride production device, the mixer is provided with a silicon tetrachloride inlet and a chlorine inlet; the silicon tetrachloride inlet is connected with the outlet of the vaporizer, and the chlorine inlet is used for introducing chlorine; an inlet of the photocatalytic reactor is connected with an outlet of the mixer; an inlet of the primary product cooler is connected with an outlet of the photocatalytic reactor; an inlet of the primary product tank is connected with an outlet of the primary product cooler. The liquid silicon tetrachloride raw material is vaporized, is uniformly mixed with chlorine in the mixer, and then enters the photocatalytic reactor, and a gas-gas mixing mode is adopted, so that the problems of low yield and poor impurity removal effect caused by non-uniform gas-liquid distribution and poor penetration effect of ultraviolet light in liquid in a traditional gas-liquid mixing photocatalytic method are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber grade silicon tetrachloride production, in particular to an optical fiber grade silicon tetrachloride production device. Background Art

[0002] At present, the main methods for preparing fiber-grade silicon tetrachloride are multi-stage distillation, adsorption complexation and gas-liquid mixed photocatalysis. Among them, the gas-liquid mixed photocatalysis method mainly removes impurities by mixing chlorine gas (gaseous) with silicon tetrachloride raw material (liquid) through photocatalytic reaction. However, there are problems such as low yield and poor impurity removal effect due to uneven gas-liquid distribution and poor penetration of ultraviolet light in liquid. Utility Model Content

[0003] In view of the above situation, the utility model provides a fiber-grade silicon tetrachloride production device, which aims to solve the technical problems of the existing gas-liquid mixed photocatalytic method due to uneven gas-liquid distribution and poor penetration of ultraviolet light in liquid, resulting in low yield and poor impurity removal effect.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The utility model provides a fiber-grade silicon tetrachloride production device, comprising:

[0006] A vaporizer, used to vaporize liquid silicon tetrachloride raw material;

[0007] A mixer having a silicon tetrachloride inlet and a chlorine gas inlet; the silicon tetrachloride inlet is connected to the outlet of the vaporizer, and the chlorine gas inlet is used to introduce chlorine gas;

[0008] a photocatalytic reactor, the inlet of which is connected to the outlet of the mixer;

[0009] a primary product cooler, the inlet of which is connected to the outlet of the photocatalytic reactor;

[0010] A primary product tank has its inlet connected to the outlet of the primary product cooler.

[0011] In some embodiments of the present invention, an electric heating device is provided in the vaporizer.

[0012] In some embodiments of the present invention, the primary product cooler adopts a spray type heat exchanger.

[0013] In some embodiments of the present invention, the primary product tank has a gas phase outlet, and the gas phase outlet of the primary product tank is connected to the waste chlorine absorption system at the rear end.

[0014] In some embodiments of the present invention, the photocatalytic reactor further comprises:

[0015] A protective gas inlet, located at the bottom of the photocatalytic reactor, is used to introduce nitrogen;

[0016] The exhaust gas outlet is located at the top of the photocatalytic reactor, and the exhaust gas outlet is connected to the waste chlorine absorption system at the rear end.

[0017] In some embodiments of the present invention, the photocatalytic reactor has:

[0018] A quartz tube, one end of which is connected to the inlet of the photocatalytic reactor via a distributor, and the other end of which is connected to the outlet of the photocatalytic reactor;

[0019] Ultraviolet lamps, multiple ultraviolet lamps are circumferentially arranged on the outer wall of the quartz tube.

[0020] In some embodiments of the present invention, the distributor comprises:

[0021] A main pipe, one end of which is connected to the inlet of the photocatalytic reactor;

[0022] Branch pipes, wherein a plurality of branch pipes are connected to the outer wall of the main pipe, and one end of the branch pipes extends toward the inner wall of the photocatalytic reactor;

[0023] The connecting flange is arranged on the main pipe and the branch pipe, and the connecting flange is connected to the quartz tube through a short-circuit component.

[0024] In some embodiments of the present invention, the connecting flange is made of stainless steel.

[0025] In some embodiments of the present invention, the end of the quartz tube has a quartz tube flange;

[0026] The short-circuit assembly comprises a short-circuit piece, one end of which is provided with a flange plate matching the connecting flange, and the other end of which is provided with a short-circuit flange, and the short-circuit flange is detachably connected with the quartz tube flange.

[0027] In some embodiments of the present invention, the short-circuit component is made of polytetrafluoroethylene.

[0028] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0029] The liquid silicon tetrachloride raw material is vaporized and mixed evenly with chlorine in a mixer before entering the photocatalytic reactor. The gas-gas mixing method is adopted to solve the problems of low yield and poor impurity removal effect caused by uneven gas-liquid distribution and poor penetration of ultraviolet light in the liquid in the traditional gas-liquid mixed photocatalytic method.

[0030] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a schematic diagram of the structure of an optical fiber grade silicon tetrachloride production device;

[0033] Figure 2 It is a schematic diagram of the structure inside the photocatalytic reactor;

[0034] Figure 3 This is a schematic diagram of the structure of the distributor.

[0035] icon:

[0036] 1-vaporizer, 11-electric heating equipment,

[0037] 2- mixer, 21- silicon tetrachloride inlet, 22- chlorine gas inlet,

[0038] 3-photocatalytic reactor, 31-protective gas inlet, 32-waste gas outlet, 33-quartz tube, 331-quartz tube flange, 34-ultraviolet lamp, 35-photocatalytic reactor inlet, 36-photocatalytic reactor outlet,

[0039] 4-primary product cooler, 5-primary product tank, 51-transfer pump,

[0040] 6-distributor, 61-main pipe, 62-branch pipe, 63-connecting flange, 64-short-connector, 641-flange, 642-short-connector flange,

[0041] 7-Collector. DETAILED DESCRIPTION

[0042] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0043] In the description of the embodiments of the present invention, it needs to be understood that the terms "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0044] In addition, the term "several" means one or more than one, unless clearly and specifically defined otherwise.

[0045] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0046] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0047] Example 1

[0048] See also Figure 1 to Figure 3 This embodiment provides a fiber-grade silicon tetrachloride production device, including a vaporizer 1, a mixer 2, a photocatalytic reactor 3, a primary product cooler 4 and a primary product tank 5.

[0049] The vaporizer 1 is used to vaporize the liquid silicon tetrachloride raw material. In this embodiment, preferably, the vaporizer 1 uses an electric heating device 11 to heat the liquid silicon tetrachloride, and the generated gaseous silicon tetrachloride is discharged from the outlet of the vaporizer 1.

[0050] The mixer 2 has a silicon tetrachloride inlet 21 and a chlorine inlet 22 ; the silicon tetrachloride inlet 21 is connected to the outlet of the vaporizer 1 , and the chlorine inlet 22 is used to introduce chlorine; the chlorine and gaseous silicon tetrachloride are mixed evenly in the mixer 2 .

[0051] The photocatalytic reactor 3 is used to cause a photocatalytic reaction between chlorine and gaseous silicon tetrachloride. The inlet 35 of the photocatalytic reactor is connected to the outlet of the mixer 2.

[0052] The photocatalytic reactor 3 further includes a protective gas inlet 31 and an exhaust gas outlet 32. The protective gas inlet 31 is located at the bottom of the photocatalytic reactor 3 and is used to introduce nitrogen; the exhaust gas outlet 32 ​​is located at the top of the photocatalytic reactor 3, and the exhaust gas outlet 32 ​​is connected to the waste chlorine absorption system at the rear end. Nitrogen is introduced into the bottom of the photocatalytic reactor 3 for protection, and is discharged from the top into the waste chlorine absorption system (exhaust gas treatment system) to deal with emergencies.

[0053] The inlet of the primary product cooler 4 is connected to the outlet 36 of the photocatalytic reactor, and the outlet of the primary product cooler 4 is connected to the inlet of the primary product tank 5. The primary product cooler 4 adopts a spray type heat exchanger.

[0054] The primary product tank 5 has a liquid phase outlet and a gas phase outlet. The liquid phase outlet of the primary product tank 5 is connected to the distillation system at the rear end through a delivery pump 51. The gas phase outlet of the primary product tank 5 is connected to the waste chlorine absorption system at the rear end. The delivery pump 51 adopts a shielded pump.

[0055] The working principle of the above-mentioned fiber-grade silicon tetrachloride production device:

[0056] Liquid silicon tetrachloride raw material is introduced into vaporizer 1 to generate gaseous silicon tetrachloride, and the gaseous silicon tetrachloride is mixed with high-purity chlorine in mixer 2 and enters photocatalytic reactor 3 to react in photocatalytic reactor 3. After the reaction, the raw material enters primary product cooler 4 to be cooled to obtain liquid primary product, and the liquid primary product enters primary product tank 5 and is transported to the rear-end distillation system (including distillation tower) through delivery pump 51. The gas enters waste chlorine absorption system (tail gas treatment system) for treatment.

[0057] This embodiment has at least the following beneficial effects:

[0058] 1. After the liquid silicon tetrachloride raw material is vaporized and evenly mixed with chlorine in the mixer 2, it enters the photocatalytic reactor 3. The gas-gas mixing method is adopted to solve the problems of low yield and poor impurity removal effect caused by uneven gas-liquid distribution and poor penetration of ultraviolet light in the liquid in the traditional gas-liquid mixed photocatalytic method.

[0059] 2. The vaporizer 1 adopts electric heating instead of using heating media such as steam, hot water or thermal oil, so it is not easy to introduce impurities.

[0060] 3. The primary product cooler 4 adopts a spray type heat exchanger, which can isolate the heat exchange water and prevent the entry of trace water or other impurities.

[0061] Example 2

[0062] This embodiment is a further improvement made on the basis of Embodiment 1.

[0063] See also Figure 1 to Figure 3 The photocatalytic reactor 3 has a quartz tube 33 and ultraviolet lamps 34. Multiple ultraviolet lamps 34 are circumferentially attached to the outer wall of the quartz tube 33. One end of the quartz tube 33 is connected to the inlet 35 of the photocatalytic reactor through a distributor 6, and the other end is connected to the outlet 36 of the photocatalytic reactor through a collector 7. The end of the quartz tube 33 has a quartz tube flange 331.

[0064] One end of the quartz tube 33 is connected to the inlet 35 of the photocatalytic reactor via the distributor 6 as follows:

[0065] The distributor 6 includes a main pipe 61 and a branch pipe 62. One end of the main pipe 61 is connected to the inlet 35 of the photocatalytic reactor; a plurality of branch pipes 62 are connected to the outer wall of the main pipe 61, and one end (the end) of the branch pipe 62 extends in a direction close to the inner wall of the photocatalytic reactor 3. A plurality of connecting flanges 63 are provided on the main pipe 61 and the branch pipe 62. The connecting flange 63 is detachably connected to the quartz tube 33 through a short-circuit assembly. The short-circuit assembly includes a short-circuit component 64. One end of the short-circuit component 64 has a flange 641 matching the connecting flange 63, and the other end has a short-circuit flange 642. The short-circuit flange 642 is connected to the quartz tube flange 331 through a clamp (not shown in the figure). The short-circuit component 64 is made of polytetrafluoroethylene. The connecting flange 63 is made of stainless steel.

[0066] The manner in which the quartz tube 33 is connected to the outlet 36 of the photocatalytic reactor via the collector 7 is set in accordance with the manner in which the quartz tube 33 is connected to the inlet 35 of the photocatalytic reactor via the distributor 6 .

[0067] This embodiment has at least the following beneficial effects:

[0068] 1. By setting the distributor 6, the internal space of the photocatalytic reactor 3 can be utilized to the maximum extent, the photocatalytic reaction is thorough, the ultraviolet light utilization rate is high, and the impurities are completely removed.

[0069] 2. The provision of the short-circuit assembly facilitates the connection and sealing between the quartz tube 33 and the distributor 6, thereby reducing the risk of leakage.

[0070] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. In the absence of conflicts, the embodiments of the present application and the features in the embodiments may be combined with each other at will. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical fiber grade silicon tetrachloride production device, characterized in that, include: A vaporizer, used to vaporize liquid silicon tetrachloride raw material; A mixer having a silicon tetrachloride inlet and a chlorine gas inlet; the silicon tetrachloride inlet is connected to the outlet of the vaporizer, and the chlorine gas inlet is used to introduce chlorine gas; a photocatalytic reactor, the inlet of which is connected to the outlet of the mixer; a primary product cooler, the inlet of which is connected to the outlet of the photocatalytic reactor; A primary product tank has its inlet connected to the outlet of the primary product cooler.

2. The optical fiber grade silicon tetrachloride production device according to claim 1, characterized in that: The vaporizer is provided with an electric heating device.

3. The optical fiber grade silicon tetrachloride production device according to claim 1, characterized in that: The primary product cooler adopts a spray type heat exchanger.

4. The optical fiber grade silicon tetrachloride production device according to claim 1, characterized in that: The primary product tank has a gas phase outlet, and the gas phase outlet of the primary product tank is connected to the waste chlorine absorption system at the rear end.

5. The optical fiber grade silicon tetrachloride production device according to claim 1, characterized in that: The photocatalytic reactor also includes: A protective gas inlet, located at the bottom of the photocatalytic reactor and used for introducing nitrogen; The exhaust gas outlet is located at the top of the photocatalytic reactor, and the exhaust gas outlet is connected to the waste chlorine absorption system at the rear end.

6. The optical fiber grade silicon tetrachloride production device according to claim 1, characterized in that: The photocatalytic reactor comprises: A quartz tube, one end of which is connected to the inlet of the photocatalytic reactor via a distributor, and the other end of which is connected to the outlet of the photocatalytic reactor; Ultraviolet lamps, a plurality of ultraviolet lamps are circumferentially arranged on the outer wall of the quartz tube.

7. The optical fiber grade silicon tetrachloride production device according to claim 6, characterized in that: The distributor comprises: A main pipe, one end of which is connected to the inlet of the photocatalytic reactor; A branch pipe, wherein a plurality of the branch pipes are connected to the outer wall of the main pipe, and one end of the branch pipe extends toward the inner wall of the photocatalytic reactor; A connecting flange is arranged on the main pipe and the branch pipe, and the connecting flange is connected to the quartz tube through a short-circuit assembly.

8. The optical fiber grade silicon tetrachloride production device according to claim 7, characterized in that: The connecting flange is made of stainless steel.

9. The optical fiber grade silicon tetrachloride production device according to claim 7, characterized in that: The end of the quartz tube has a quartz tube flange; The short-circuit assembly comprises a short-circuit piece, one end of which is provided with a flange plate matching the connecting flange, and the other end of which is provided with a short-circuit flange, and the short-circuit flange is detachably connected to the quartz tube flange.

10. The optical fiber grade silicon tetrachloride production device according to claim 9, characterized in that: The short-circuit piece is made of polytetrafluoroethylene.

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