A gas phase recovery system for silane

Abstract

The utility model discloses a kind of silane gas phase extraction systems, it is related to silane rectification technical field, the silane obtained by chlorosilane disproportionation method is entered into silane rectification tower by feed pipe, the silane containing light component impurities is discharged by tower top extraction pipe, after condensing by condenser, liquid phase is flowed back into silane rectification tower by first reflux pipe, gas phase is discharged by tail gas exhaust pipe;Pure silane is discharged by side gas phase extraction pipe;The silane containing heavy component impurities is discharged by column still extraction pipe after, a part is flowed back into silane rectification tower by second reflux pipe after heating by reboiler, a part is discharged by column still exhaust pipe.The utility model is extracted by side gas phase extraction pipe in silane rectification tower, improves security, reduces refrigerant load, heat medium load, equipment investment etc..According to 10000 tons / year, annual can save cold heat medium consumption expense 2000 million yuan above, reduces equipment investment 1000 million yuan.

Description

Technical Field

[0001] This utility model belongs to the field of silane distillation technology, specifically relating to a silane gas phase extraction system. Background Technology

[0002] The preparation of silanes via the disproportionation method of chlorosilanes typically requires purification by distillation before collection. However, the collection of purified silanes in the liquid phase poses significant safety risks. Based on the physical properties of silanes, with a boiling point of -112℃ and a relatively high vaporization pressure of 4.73 MPaG at room temperature (20℃), the liquid phase is usually vaporized before use or pressurized for bottling.

[0003] The following problems exist with liquid phase extraction: 1. During liquid vaporization, if the control backend fails and shuts down, there is a significant safety risk, as the pressure reaches 4.73 MPaG even at 20°C. 2. The extracted liquid material needs to be cooled by refrigerant in the distillation column, resulting in high refrigerant consumption. 3. The distillation column requires a balanced heat and cold load; when the refrigerant level at the top of the column is high, the heat consumption at the bottom is also high. 4. The distillation column equipment requires a larger diameter, resulting in high equipment investment. Utility Model Content

[0004] The purpose of this invention is to solve the problems of existing technologies and provide a silane vapor phase extraction system. Silane prepared by the disproportionation method of chlorosilane enters the silane distillation column through a feed pipe. Silane containing light component impurities is discharged through the top extraction pipe. After condensation in a condenser, the liquid phase flows back to the silane distillation column through the first reflux pipe, while the gas phase is discharged through the tail gas exhaust pipe. Pure silane is discharged through the side vapor phase extraction pipe. Silane containing heavy component impurities is discharged through the bottom extraction pipe; a portion of it is heated in a reboiler and then flows back to the silane distillation column through the second reflux pipe, while the remaining portion is discharged through the bottom exhaust pipe. This invention improves safety and reduces refrigerant load, heat transfer fluid load, and equipment investment by extracting the vapor phase through the side vapor phase extraction pipe in the silane distillation column. Based on a capacity of 10,000 tons / year, it can save more than 2 million yuan in refrigerant and heat transfer fluid consumption costs and reduce equipment investment by 1 million yuan annually.

[0005] This utility model is achieved through the following technical solution: A vapor phase extraction system for silane includes a silane distillation column. The silane distillation column is equipped with a feed pipe, a top extraction pipe, a bottom extraction pipe, a side vapor phase extraction pipe, a pressure control unit, and a level control unit. The top extraction pipe is connected to a cooler, which is equipped with a first reflux pipe and a tail gas discharge pipe. The first reflux pipe is connected to the upper end of the silane distillation column. The pressure control unit includes a pressure sensor installed on the silane distillation column and a pressure regulating valve installed on the tail gas discharge pipe. The bottom extraction pipe is connected to the bottom discharge pipe and a reboiler. The reboiler is connected to the lower end of the silane distillation column via a second reflux pipe. The level control unit includes a level sensor installed on the silane distillation column and a bottom flow regulating valve installed on the bottom discharge pipe.

[0006] Preferably, the feed pipe is equipped with a feed flow regulating valve.

[0007] Preferably, a flow meter is also provided on the feed pipe.

[0008] Preferably, a gas phase extraction flow regulating valve is provided on the side gas phase extraction pipe.

[0009] Preferably, the silane distillation column is also equipped with a temperature sensor.

[0010] Preferably, the cooler is provided with a cooling medium inlet pipe and a cooling medium outlet pipe.

[0011] Preferably, the reboiler is provided with a heat medium inlet pipe and a heat medium outlet pipe.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects: I. This utility model provides a silane vapor phase extraction system. Silane prepared by the disproportionation method of chlorosilane enters a silane distillation column through a feed pipe. Silane containing light component impurities is discharged through the top extraction pipe. After condensation in a condenser, the liquid phase flows back to the silane distillation column through a first reflux pipe, while the gas phase is discharged through a tail gas exhaust pipe. Pure silane is discharged through a side vapor phase extraction pipe. Silane containing heavy component impurities is discharged through the bottom extraction pipe; a portion is heated in a reboiler and then flows back to the silane distillation column through a second reflux pipe, while the remaining portion is discharged through the bottom exhaust pipe. This utility model improves safety and reduces refrigerant load, heating medium load, and equipment investment by extracting the vapor phase through a side vapor phase extraction pipe in the silane distillation column. Based on 10,000 tons / year, it can save more than 2 million yuan in refrigerant and heating medium consumption costs and reduce equipment investment by 1 million yuan annually.

[0013] II. The present invention provides a gas phase extraction system for silane, wherein the setting of the feed flow regulating valve and the flow meter enables precise feeding of silane.

[0014] III. The present invention provides a gas phase extraction system for silane, wherein the reboiler is heated using dichlorosilane. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; The components are as follows: 1. Silane distillation column; 2. Feed pipe; 3. Top outlet pipe; 4. Bottom outlet pipe; 5. Side vapor outlet pipe; 6. Pressure control unit; 61. Pressure sensor; 62. Pressure regulating valve; 7. Liquid level control unit; 71. Liquid level sensor; 72. Bottom flow regulating valve; 8. Cooler; 81. Cold medium inlet pipe; 82. Cold medium outlet pipe; 9. First reflux pipe; 10. Tail gas exhaust pipe; 11. Bottom outlet pipe; 12. Reboiler; 121. Heat medium inlet pipe; 122. Heat medium outlet pipe; 13. Second reflux pipe; 14. Feed flow regulating valve; 15. Flow meter; 16. Vapor outlet flow regulating valve; 17. Temperature sensor. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0017] Example 1 like Figure 1 As shown, a silane vapor phase extraction system includes a silane distillation column 1. The silane distillation column 1 is equipped with a feed pipe 2, a top extraction pipe 3, a bottom extraction pipe 4, a side vapor phase extraction pipe 5, a pressure control unit 6, and a liquid level control unit 7. The top extraction pipe 3 is connected to a cooler 8. The cooler 8 is equipped with a first reflux pipe 9 and a tail gas discharge pipe 10. The first reflux pipe 9 is connected to the upper end of the silane distillation column 1. The pressure control unit 6 includes a pressure sensor 61 installed on the silane distillation column 1 and a pressure regulating valve 62 installed on the tail gas discharge pipe 10. The bottom extraction pipe 4 is connected to the bottom discharge pipe 11 and a reboiler 12. The reboiler 12 is connected to the lower end of the silane distillation column 1 through a second reflux pipe 13. The liquid level control unit 7 includes a liquid level sensor 71 installed on the silane distillation column 1 and a bottom flow regulating valve 72 installed on the bottom discharge pipe 11. Pressure sensor 61, pressure regulating valve 62, liquid level sensor 71, and tower bottom flow regulating valve 72 are connected to the DCS controller.

[0018] Example 2 like Figure 1As shown, a silane vapor phase extraction system includes a silane distillation column 1. The silane distillation column 1 is equipped with a feed pipe 2, a top extraction pipe 3, a bottom extraction pipe 4, a side vapor phase extraction pipe 5, a pressure control unit 6, and a liquid level control unit 7. The top extraction pipe 3 is connected to a cooler 8. The cooler 8 is equipped with a first reflux pipe 9 and a tail gas discharge pipe 10. The first reflux pipe 9 is connected to the upper end of the silane distillation column 1. The pressure control unit 6 includes a pressure sensor 61 installed on the silane distillation column 1 and a pressure regulating valve 62 installed on the tail gas discharge pipe 10. The bottom extraction pipe 4 is connected to the bottom discharge pipe 11 and a reboiler 12. The reboiler 12 is connected to the lower end of the silane distillation column 1 through a second reflux pipe 13. The liquid level control unit 7 includes a liquid level sensor 71 installed on the silane distillation column 1 and a bottom flow regulating valve 72 installed on the bottom discharge pipe 11. Pressure sensor 61, pressure regulating valve 62, liquid level sensor 71, and tower bottom flow regulating valve 72 are connected to the DCS controller.

[0019] The feed pipe 2 is equipped with a feed flow regulating valve 14.

[0020] The feed pipe 2 is also equipped with a flow meter 15.

[0021] The side gas phase extraction pipe 5 is equipped with a gas phase extraction flow regulating valve 16.

[0022] The silane distillation column 1 is also equipped with a temperature sensor 17.

[0023] The cooler 8 is provided with a cooling medium inlet pipe 81 and a cooling medium outlet pipe 82.

[0024] The reboiler 12 is provided with a heat medium inlet pipe 121 and a heat medium outlet pipe 122.

[0025] The components of the silane distillation column 1, cooler 8, pressure sensor 61, pressure regulating valve 62, reboiler 12, level sensor 71, column bottom flow regulating valve 72, feed flow regulating valve 14, flow meter 15, vapor phase outlet flow regulating valve 16, and temperature sensor 17 are all existing technologies and will not be described in detail here. The feed flow regulating valve 14, flow meter 15, vapor phase outlet flow regulating valve 16, and temperature sensor 17 are connected to the DCS controller.

[0026] Compared with the prior art, this utility model has the following advantages and beneficial effects: I. This utility model provides a silane vapor phase extraction system. Silane prepared by the disproportionation method of chlorosilane enters the silane distillation column 1 through the feed pipe 2. Silane containing light component impurities is discharged through the top extraction pipe 3. After condensation in the condenser, the liquid phase flows back to the silane distillation column 1 through the first reflux pipe 9, and the gas phase is discharged through the tail gas exhaust pipe 10. Pure silane is discharged through the side vapor phase extraction pipe 5. Silane containing heavy component impurities is discharged through the bottom extraction pipe 4, and part of it is heated by the reboiler 12 and then flows back to the silane distillation column 1 through the second reflux pipe 13, while the rest is discharged through the bottom exhaust pipe 11. This utility model, by extracting the silane through the side vapor phase extraction pipe 5 in the silane distillation column 1, can effectively avoid the above defects, improve safety, and reduce refrigerant load, heat transfer fluid load, and equipment investment. Calculated at 10,000 tons / year, it can save more than 2 million yuan in refrigerant and heat transfer fluid consumption costs and reduce equipment investment by 1 million yuan annually.

[0027] II. The present invention provides a gas phase extraction system for silane, wherein the feed flow regulating valve 14 and the flow meter 15 enable precise feeding of silane.

[0028] III. The present invention provides a gas phase extraction system for silane, wherein the reboiler 12 is heated using dichlorosilane.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A gas phase extraction system for silane, characterized in that: The system includes a silane distillation column (1), which is equipped with a feed pipe (2), a top outlet pipe (3), a bottom outlet pipe (4), a side gas outlet pipe (5), a pressure control unit (6), and a level control unit (7). The top outlet pipe (3) is connected to a cooler (8), which is equipped with a first reflux pipe (9) and a tail gas exhaust pipe (10). The first reflux pipe (9) is connected to the upper end of the silane distillation column (1). The pressure control unit (6) includes components installed in the column. The pressure sensor (61) on the silane distillation column (1) and the pressure regulating valve (62) on the tail gas discharge pipe (10) are provided; the bottom outlet pipe (4) is connected to the bottom outlet pipe (11) and the reboiler (12), the reboiler (12) is connected to the lower end of the silane distillation column (1) through the second reflux pipe (13), and the liquid level control unit (7) includes a liquid level sensor (71) on the silane distillation column (1) and a bottom flow regulating valve (72) on the bottom outlet pipe (11).

2. The silane gas phase extraction system according to claim 1, characterized in that: The feed pipe (2) is equipped with a feed flow regulating valve (14).

3. The silane gas phase extraction system according to claim 1, characterized in that: A flow meter (15) is also installed on the feed pipe (2).

4. A silane gas phase extraction system according to claim 1, characterized in that: A gas phase extraction flow regulating valve (16) is provided on the side gas phase extraction pipe (5).

5. A silane gas phase extraction system according to claim 1, characterized in that: A temperature sensor (17) is also installed on the silane distillation column (1).

6. A silane gas phase extraction system according to claim 1, characterized in that: The cooler (8) is provided with a cold medium inlet pipe (81) and a cold medium outlet pipe (82).

7. A silane gas phase extraction system according to claim 1, characterized in that: The reboiler (12) is provided with a heat medium inlet pipe (121) and a heat medium outlet pipe (122).

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