Production system and production process for preparing trichlorosilane

Abstract

The invention discloses a production system and a production process for preparing trichlorosilane, and relates to the technical field of trichlorosilane production.The production system comprises a hydrogenation reactor, a feeder, a gas supply mechanism, a condenser and a fractionator; the input end and the output end of the condenser are respectively connected with a first connecting pipe and a second connecting pipe, the second connecting pipe is connected with the fractionator, and the fractionator is also provided with a discharge pipe and a recovery pipe. According to the invention, the flowing smoothness of powder can be guaranteed, the risk of feeding interruption is fundamentally avoided, the homogeneous mixing of materials is realized, the design breaks through the limitation of a traditional split feeding mechanism, the risk of layering of silicon powder and a catalyst is eliminated, the trichlorosilane synthesis efficiency is improved from the source, the automatic cleaning of the cylindrical filter screen is realized, and the production cost is reduced. The problem of system shutdown caused by blockage of a traditional fixed filter screen is solved, and continuous production is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of trichlorosilane production, and in particular to a production system and a production process for preparing trichlorosilane. BACKGROUND

[0002] In the field of trichlorosilane preparation, the stability and efficiency of the production system and process are crucial for improving product quality, reducing production costs, and meeting the needs of large-scale industrial production. However, the traditional production system and process for preparing trichlorosilane face many problems that need to be solved in practical application.

[0003] In the traditional production system, the feeder is a key component for feeding, and its structural design has defects. During the feeding process, silicon powder is easily adsorbed on the inner wall of the feeder, gradually forming a wall hanging layer. With the passage of time, the wall hanging layer thickens, not only occupying the effective volume of the feeder, leading to inaccurate feeding amount, but also causing the feeding channel to be blocked, resulting in feeding interruption. Feeding interruption will directly affect the continuity of the subsequent reaction, making the production process unstable, reducing production efficiency, and increasing production costs. At the same time, the materials are prone to aggregation during the falling process, forming arching. Arching will cause the material to flow poorly and not enter the reaction device uniformly, so that the silicon powder and catalyst cannot be fully mixed, thereby affecting the uniformity and completeness of the reaction and reducing the synthesis efficiency of trichlorosilane.

[0004] In the preparation process of trichlorosilane, the filtration link plays a key role in separating the product and impurities. The traditional production system usually uses a fixed filter screen for filtration, however, this filter screen is easily clogged by silicon powder and catalyst particles during use. As the reaction progresses, a large amount of silicon powder and catalyst particles will adhere to the surface of the filter screen, gradually forming a clogging layer, causing the filter resistance of the filter screen to increase and the filtration efficiency to decrease. Moreover, frequent shutdown to clean the filter screen will also affect the quality stability of the product, making it impossible to achieve continuous production and difficult to meet the needs of large-scale industrial production. SUMMARY

[0005] The present application relates to the technical field of trichlorosilane production, and in particular to a production system and a production process for preparing trichlorosilane.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The utility model provides a production system for preparing trichlorosilane, including hydrogenation reactor, feeder, gas supply mechanism, condenser, fractionator, the bottom of feeder is equipped with the feed pipe which is connected with hydrogenation reactor, the input end, output end of condenser is connected with first connecting pipe, second connecting pipe respectively, second connecting pipe is connected with fractionator, still be equipped with discharge pipe, recovery pipe on fractionator, still include filter box, the top of hydrogenation reactor is equipped with the reaction outlet pipe which is connected with filter box, the inside of filter box is equipped with filter mechanism, filter mechanism is connected with first connecting pipe, the top of feeder is equipped with feeding mechanism.

[0008] As a further improvement of the utility model, the gas supply mechanism includes a gas mixer, hydrogen storage bottle and silicon tetrachloride storage bottle are connected below the gas mixer, a gas supply pipe is connected between the gas mixer and the hydrogenation reactor, and the end of the recovery pipe away from the fractionator is connected with the silicon tetrachloride storage bottle.

[0009] As a further improvement of the utility model, the feeding mechanism includes a first rotating pipe arranged through the top of the feeder, the first rotating pipe is rotatably connected with the feeder through a bearing, a first rotary joint is installed at the upper end of the first rotating pipe, two scraper rods are fixedly connected to the side wall of the first rotating pipe in the feeder, a plurality of stirring rods are fixedly connected to the side wall of the first rotating pipe in the feeder, a rotating structure is arranged on the top of the feeder and connected with the first rotating pipe, and two storage structures are arranged on the top of the feeder and connected with the first rotating pipe and the first rotary joint.

[0010] As a further improvement of the utility model, the filter mechanism includes a second rotating pipe arranged through the top of the filter box, the second rotating pipe is rotatably connected with the filter box through a bearing, the upper end of the second rotating pipe is connected with the first connecting pipe through a second rotary joint, a cylindrical filter screen is connected to one end of the second rotating pipe inside the filter box, a spiral brush rod is sleeved outside the cylindrical filter screen, a second synchronous wheel is fixedly sleeved to the side wall of the second rotating pipe, a first synchronous wheel is fixedly sleeved to the side wall of the first rotating pipe, and the first synchronous wheel and the second synchronous wheel are connected through a first synchronous belt.

[0011] As a further improvement of the utility model, the rotating structure includes a motor installed on the top of the feeder, a second gear is fixedly connected to the output shaft of the motor, a first gear is fixedly sleeved to the side wall of the first rotating pipe, and the first gear is engaged with the second gear.

[0012] As a further improvement of the application, the storage structure comprises a storage tank, the bottom of the storage tank is fixed with two fixed rods, the lower ends of the fixed rods are fixed on the top of the feeder, the bottom of the storage tank is provided with a screw feeding pump, the output end of the screw feeding pump is connected with a first rotary joint, the driving end of the screw feeding pump is fixedly connected with a third synchronous wheel, a fourth synchronous wheel is fixedly sleeved on the side wall of the first rotating pipe, and the fourth synchronous wheel is connected with the third synchronous wheel through a synchronous belt.

[0013] As a further improvement of the application, the inner top wall of the filter box is fixed with a spiral brush rod, and the spiral brush rod is sleeved outside the cylindrical filter screen.

[0014] As a further improvement of the application, the bottom of the filter box is threadedly sleeved with a cover.

[0015] A production process for preparing trichlorosilane using the production system, the production process comprising the following steps:

[0016] S1, inputting silicon powder and catalyst into the hydrogenation reactor through the feeder, and inputting mixed gas of hydrogen and silicon tetrachloride gas into the hydrogenation reactor through the gas supply mechanism, and carrying out reaction in the hydrogenation reactor;

[0017] S2, the gas output from the hydrogenation reactor is input into the filter box through the reaction gas pipe, and is filtered through the filtering mechanism to separate the silicon powder and catalyst particles in the gas;

[0018] S3, then liquefying the silicon tetrachloride in the output gas by using the condenser, separating the silicon tetrachloride in the gas stream by using the fractionator, and then discharging the trichlorosilane in the gas in a gaseous state through the discharge pipe.

[0019] The application has the following beneficial effects:

[0020] The feeder is internally provided with a rotating scraper rod and a stirring rod double-acting mechanism, the scraper rod rotates closely to the inner wall of the feeder, breaks the wall hanging layer formed by the adsorption of silicon powder, the stirring rod forms a vortex disturbance in the material falling path, breaks the arching tendency caused by the electrostatic force between particles, and the two mechanisms cooperate to ensure the smoothness of powder flow and fundamentally eliminate the risk of interrupted feeding.

[0021] The motor drives the second gear to rotate the first gear, so that the first rotating pipe synchronously drives the stirring rod to realize uniform mixing of the material, which breaks through the limitation of the traditional split type feeding mechanism, eliminates the risk of layering of silicon powder and catalyst, and improves the synthesis efficiency of trichlorosilane from the source.

[0022] The spiral brush rod and the rotating cylindrical filter screen form reverse motion, automatically scrape off the silicon powder and catalyst particles on the surface of the filter screen, solve the problem of system shutdown caused by blockage of the traditional fixed filter screen, and realize continuous production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a production system for preparing trichlorosilane proposed in this invention;

[0024] Figure 2 This is a schematic diagram of the feeding mechanism and filtration mechanism of a production system for preparing trichlorosilane proposed in this invention.

[0025] Figure 3 This is a schematic diagram of the second rotating tube, cylindrical filter screen, and spiral brush rod of a production system for preparing trichlorosilane proposed in this invention.

[0026] Figure 4 This is a schematic diagram of the first rotating tube and rotating structure of a production system for preparing trichlorosilane proposed in this invention.

[0027] Figure 5 This is a schematic diagram of the first rotating pipe, the first rotary joint, and the material storage structure of a production system for preparing trichlorosilane proposed in this invention.

[0028] In the diagram: 1 Hydrogenation reactor, 2 Feed pipe, 3 Feeder, 4 Gas supply pipe, 5 Gas mixer, 6 Hydrogen storage bottle, 7 Silicon tetrachloride storage bottle, 8 Fixing rod, 9 Storage tank, 10 Reaction outlet pipe, 11 Filter box, 12 Cover, 13 First connecting pipe, 14 Condenser, 15 Second connecting pipe, 16 Fractionator, 17 Discharge pipe, 18 Recovery pipe, 19 Screw feed pump, 20 First rotary joint, 21 First synchronous pulley, 22 First synchronous belt, 23 Second synchronous pulley, 24 First rotating tube, 25 Scraper, 26 Stirring rod, 27 Second rotating tube, 28 Cylindrical filter screen, 29 Spiral brush rod, 30 Motor, 31 First gear, 32 Second gear, 33 Third synchronous pulley, 34 Second synchronous belt, 35 Fourth synchronous pulley, 36 Second rotary joint. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Reference Figures 1-5The utility model relates to a production system for preparing trichlorosilane, which comprises a hydrogenation reactor 1, a feeder 3, a gas supply mechanism, a condenser 14, a fractionator 16, the bottom of the feeder 3 is provided with a feeding pipe 2 connected with the hydrogenation reactor 1, the input end and the output end of the condenser 14 are respectively connected with a first connecting pipe 13 and a second connecting pipe 15, the second connecting pipe 15 is connected with the fractionator 16, the fractionator 16 is further provided with a discharge pipe 17 and a recovery pipe 18, and the utility model further comprises a filter box 11, the bottom of the filter box 11 is threadedly sleeved with a cover 12, the top of the hydrogenation reactor 1 is provided with a reaction gas outlet pipe 10 connected with the filter box 11, the inside of the filter box 11 is provided with a filtering mechanism, the filtering mechanism is connected with the first connecting pipe 13, and the top of the feeder 3 is provided with a feeding mechanism.

[0031] The gas supply mechanism comprises a gas mixer 5, the lower portion of the gas mixer 5 is connected with a hydrogen storage bottle 6 and a silicon tetrachloride storage bottle 7, the gas mixer 5 is connected with the hydrogenation reactor 1 through a gas supply pipe 4, and one end of the recovery pipe 18 away from the fractionator 16 is connected with the silicon tetrachloride storage bottle 7.

[0032] The feeding mechanism comprises a first rotating pipe 24 penetratingly arranged at the top of the feeder 3, the first rotating pipe 24 is rotationally connected with the feeder 3 through a bearing, the upper end of the first rotating pipe 24 is provided with a first rotary joint 20, two scraping rods 25 are fixedly connected with the side wall of the feeder 3, a plurality of stirring rods 26 are fixedly connected with the side wall of the feeder 3, the top of the feeder 3 is provided with a rotating structure connected with the first rotating pipe 24, and the top of the feeder 3 is provided with two storage structures connected with the first rotating pipe 24 and the first rotary joint 20.

[0033] The filtering mechanism comprises a second rotating pipe 27 penetratingly arranged at the top of the filter box 11, the second rotating pipe 27 is rotationally connected with the filter box 11 through a bearing, the upper end of the second rotating pipe 27 is connected with the first connecting pipe 13 through a second rotary joint 36, one end of the second rotating pipe 27 inside the filter box 11 is connected with a cylindrical filter screen 28, a spiral brush rod 29 is fixedly arranged on the inner top wall of the filter box 11, the spiral brush rod 29 is sleeved on the outer side of the cylindrical filter screen 28, the side wall of the spiral brush rod 29 is provided with brush hairs in contact with the cylindrical filter screen 28, a second synchronous wheel 23 is fixedly sleeved on the side wall of the second rotating pipe 27, a first synchronous wheel 21 is fixedly sleeved on the side wall of the first rotating pipe 24, and the first synchronous wheel 21 and the second synchronous wheel 23 are connected through a first synchronous belt 22.

[0034] The rotating structure comprises a motor 30 arranged at the top of the feeder 3, the output shaft of the motor 30 is fixedly connected with a second gear 32, a first gear 31 is fixedly sleeved on the side wall of the first rotating pipe 24, and the first gear 31 is engaged with the second gear 32.

[0035] The storage structure comprises a storage box 9, the bottom of the storage box 9 is fixed with two fixed rods 8, the lower end of the fixed rod 8 is fixed on the top of the feeder 3, the bottom of the storage box 9 is provided with a screw feeding pump 19, the output end of the screw feeding pump 19 is connected with a first rotary joint 20, the driving end of the screw feeding pump 19 is fixedly connected with a third synchronous wheel 33, a fourth synchronous wheel 35 is fixedly sleeved on the side wall of the first rotating pipe 24, and the fourth synchronous wheel 35 is connected with the third synchronous wheel 33 through a synchronous belt 34.

[0036] When the application is used, the motor 30 is started, the second gear 32 drives the first gear 31 to rotate, and then drives the first rotating pipe 24 to rotate, and at the same time, the fourth synchronous wheel 35 drives the third synchronous wheel 33 to drive the screw feeding pump 19 to operate through the synchronous belt 34, the silicon powder and the catalyst are transported from the storage box 9 to the first rotary joint 20 through the screw feeding pump 19, the mixed material enters the hydrogenation reactor 1 through the feeding pipe 2, and enters the feeder 3 through the first rotating pipe 24, so that the first rotating pipe 24 drives the stirring rod 26 to mix the material.

[0037] Then the gas in the hydrogen storage bottle 6 and the silicon tetrachloride storage bottle 7 is mixed in the gas mixer 5 and then enters the hydrogenation reactor 1 through the gas supply pipe 4, the generated gas enters the filter box 11 through the reaction gas outlet pipe 10, the first synchronous wheel 21, the second synchronous wheel 23 and the first synchronous belt 22 are driven to rotate the second rotating pipe 27, so that the cylindrical filter screen 28 can be rotated, the cylindrical filter screen 28 can be used to filter the gas, the relative movement between the cylindrical filter screen 28 and the spiral brush rod 29 can clean the surface of the cylindrical filter screen 28, and after filtration, the gas enters the first connecting pipe 13 through the second rotary joint 36 and is transported to the condenser 14 to liquefy the silicon tetrachloride, the mixed material after liquefaction flows through the second connecting pipe 15 and enters the fractionating device 16, the separated silicon tetrachloride liquid returns to the silicon tetrachloride storage bottle 7 through the recovery pipe 18, and gaseous trichlorosilane is output through the discharge pipe 17.

[0038] A production process for preparing trichlorosilane, a production system used, the production process comprising the following steps:

[0039] S1, the silicon powder, the catalyst are input into the hydrogenation reactor 1 through the feeder 3, and the mixed gas of hydrogen and silicon tetrachloride gas is supplied into the hydrogenation reactor 1 through the gas supply mechanism, and the reaction is carried out in the hydrogenation reactor 1;

[0040] S2, the gas output in the hydrogenation reactor 1 is input into the filter box 11 through the reaction gas outlet pipe 10, and is filtered through the filtering mechanism to separate the silicon powder and catalyst particles in the gas;

[0041] S3, then using condenser 14 to liquefy the silicon tetrachloride in the output gas, and then using a fractionator 16 to separate the silicon tetrachloride in the gas stream, and then the trichlorosilane in the gas is discharged through discharge pipe 17 in a gaseous state.

[0042] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, within the technical scope disclosed by the present application, can make equivalent replacements or changes according to the technical solutions and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A production system for preparing trichlorosilane, comprising a hydrogenation reactor (1), a feeder (3), a gas supply mechanism, a condenser (14), a fractionator (16), the bottom of the feeder (3) being provided with a feeding pipe (2) connected with the hydrogenation reactor (1), the input end and the output end of the condenser (14) being respectively connected with a first connecting pipe (13) and a second connecting pipe (15), the second connecting pipe (15) being connected with the fractionator (16), the fractionator (16) being further provided with a discharging pipe (17) and a recovery pipe (18), characterized in that, It also includes a filter box (11), the top of the hydrogenation reactor (1) is provided with a reaction out-gas pipe (10) connected with the filter box (11), the inside of the filter box (11) is provided with a filtering mechanism, the filtering mechanism is connected with a first connecting pipe (13), the top of the feeder (3) is provided with a feeding mechanism.

2. The production system for preparing trichlorosilane according to claim 1, wherein The gas supply mechanism includes a gas mixer (5), a hydrogen storage bottle (6) and a silicon tetrachloride storage bottle (7) are connected below the gas mixer (5), a gas supply pipe (4) is connected between the gas mixer (5) and the hydrogenation reactor (1), and one end of the recovery pipe (18) away from the fractionator (16) is connected with the silicon tetrachloride storage bottle (7).

3. The production system for preparing trichlorosilane according to claim 1, wherein The feeding mechanism includes a first rotating pipe (24) penetratingly arranged at the top of the feeder (3), the first rotating pipe (24) is rotationally connected with the feeder (3) through a bearing, a first rotary joint (20) is installed at the upper end of the first rotating pipe (24), two scraping rods (25) are fixedly connected on the side wall of the first rotating pipe (24) in the feeder (3), a plurality of stirring rods (26) are fixedly connected on the side wall of the first rotating pipe (24) in the feeder (3), the top of the feeder (3) is provided with a rotating structure connected with the first rotating pipe (24), and the top of the feeder (3) is provided with two storage structures connected with the first rotating pipe (24) and the first rotary joint (20).

4. The production system for preparing trichlorosilane according to claim 3, wherein The filtering mechanism includes a second rotating pipe (27) penetratingly arranged at the top of the filter box (11), the second rotating pipe (27) is rotationally connected with the filter box (11) through a bearing, the upper end of the second rotating pipe (27) is connected with the first connecting pipe (13) through a second rotary joint (36), a cylindrical filter screen (28) is connected to one end of the second rotating pipe (27) in the filter box (11), a second synchronous wheel (23) is fixedly sleeved on the side wall of the second rotating pipe (27), a first synchronous wheel (21) is fixedly sleeved on the side wall of the first rotating pipe (24), and the first synchronous wheel (21) and the second synchronous wheel (23) are connected through a first synchronous belt (22).

5. The production system for preparing trichlorosilane according to claim 3, wherein The rotating structure includes a motor (30) installed at the top of the feeder (3), a second gear (32) is fixedly connected to the output shaft of the motor (30), a first gear (31) is fixedly sleeved on the side wall of the first rotating pipe (24), and the first gear (31) is engaged with the second gear (32).

6. The production system for preparing trichlorosilane according to claim 3, wherein The storage structure includes a storage box (9), two fixed rods (8) are fixed to the bottom of the storage box (9), the lower ends of the fixed rods (8) are fixed to the top of the feeder (3), a screw feeder pump (19) is installed at the bottom of the storage box (9), the output end of the screw feeder pump (19) is connected with the first rotary joint (20), a third synchronous wheel (33) is fixedly connected to the driving end of the screw feeder pump (19), a fourth synchronous wheel (35) is fixedly sleeved on the side wall of the first rotating pipe (24), and the fourth synchronous wheel (35) and the third synchronous wheel (33) are connected through a synchronous belt (34).

7. The production system for preparing trichlorosilane according to claim 4, wherein A helical brush rod (29) is fixed on the inner top wall of the filter box (11), and the helical brush rod (29) is sleeved outside the cylindrical filter screen (28).

8. The production system for preparing trichlorosilane according to claim 1, wherein A cover (12) is threadedly sleeved on the bottom of the filter box (11).

9. A production process for preparing trichlorosilane, characterized by, The production process using the production system according to any one of claims 1-8 comprises the following steps: S1, inputting silicon powder and a catalyst into the hydrogenation reactor (1) through the feeder (3), and supplying a mixed gas of hydrogen and silicon tetrachloride gas into the hydrogenation reactor (1) through the gas supply mechanism, and performing a reaction in the hydrogenation reactor (1); S2, inputting the gas output from the hydrogenation reactor (1) into the filter box (11) through the reaction gas pipe (10), and performing filtering through the filtering mechanism to separate silicon powder and catalyst particles in the gas; S3, liquefying the silicon tetrachloride in the output gas by using the condenser (14), separating the silicon tetrachloride in the gas stream by using the fractionator (16), and then discharging the trichlorosilane in the gas in a gaseous state through the discharge pipe (17).

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