Trichlorosilane light component removal rectification cooling device

Abstract

The utility model discloses a rectifying and cooling device for light component removal of trichlorosilane, which belongs to the field of rectification and comprises a rectifying tower, a condensing device and a waste gas purifying device. The condensation pipeline structure comprises a flow dividing condensation pipe, a condensation shell, an air inlet shell and a condensate collecting opening. Compared with the prior art, the condensation pipeline structure has the advantages that the condensate collecting opening and the liquid outlet of the flow dividing condensation pipe are connected in a welded mode, and the condensate collecting opening and the liquid outlet of the flow dividing condensation pipe are placed in the condensation shell and welded into an integrated structure through a welding device, so that the condensation pipeline structure is in a cooling state in the whole process; according to the invention, the detachable recovery bottle is provided with the constant temperature device, the whole liquefaction process of the dichlorosilane gas is ensured to be in a constant temperature state, secondary volatilization of the dichlorosilane gas is avoided, and similarly, the cooling sleeve is sleeved outside the detachable recovery bottle, so that the dichlorosilane liquid in the detachable recovery bottle is ensured not to be gasified and volatilized again.

Description

Technical Field

[0001] The utility model relates to the field of distillation, in particular to a trichlorosilane light removal distillation cooling device. Background Art

[0002] In the existing trichlorosilane production process (SiH 2 Cl 2 +SiCl 4 → Crude SiHCl 3 ), some by-products will be produced, such as dichlorosilane and silicon tetrachloride, and some of these by-products will be mixed into the finished trichlorosilane during separation. In order to improve the purity of trichlorosilane, it is necessary to perform distillation and condensation operations on it to separate the dichlorosilane for recycling.

[0003] The existing trichlorosilane light removal is to fractionate dichlorosilane and trichlorosilane through a distillation tower, and the dichlorosilane gas flows into a condensing device through a corrosion-resistant pipe for condensation and collection. In order to ensure that the dichlorosilane gas can be better and continuously condensed in the condensation pipe structure, a condensate supply device is required to circulate the coolant for it, so as to stabilize the temperature inside the condensation pipe structure and ensure the condensation efficiency; in order to ensure that the dichlorosilane liquid does not flow back, an inclined condenser tube bracket is usually placed under the condensation pipe structure, and the unidirectional flow of the dichlorosilane liquid is ensured by tilting the condensation pipe structure; because the liquefaction temperature of the dichlorosilane gas is different from the liquefaction temperature of other impurities, after the liquefied dichlorosilane liquid flows into the recovery bottle, the remaining waste gas enters the waste gas purification device for purification.

[0004] Although the existing trichlorosilane light removal distillation cooling device can effectively liquefy and recover dichlorosilane gas, after the dichlorosilane gas is liquefied, the condensation pipeline structure has no corresponding cooling device at the liquid collection port and the outer wall of the recovery bottle, which makes the liquefied dichlorosilane very easy to volatilize again, thereby affecting the recovery efficiency of the dichlorosilane gas. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the liquid collecting port and the outer wall of the recovery bottle of the condensing pipeline structure of the existing trichlorosilane light distillation cooling device do not have a corresponding cooling device, so that the liquefied dichlorosilane is converted into gas again at room temperature and evaporated, which affects the recovery efficiency of the dichlorosilane gas.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is: a trichlorosilane delight distillation cooling device, comprising a distillation tower, a condensing device and an exhaust gas purification device, the distillation tower and the exhaust gas purification device are connected to the condensing device through a corrosion-resistant pipe, the condensing pipe structure comprises a diverter condenser, a condensing shell, an air inlet shell and a condensate collection port, the diverter condenser and the condensate collection port both pass through the interior of the condensing shell, the air inlet shell and the condensate collection port are connected to the two side end faces of the diverter condenser, the diverter condenser and the inlet end of the condensing shell, and the outlet of the condensate collection port and the liquid outlet of the condensing shell are all connected by welding, a tee is provided between the water outlet of the condensing pipe structure and the corrosion-resistant pipe, the diverter condenser, the air inlet shell and the tee are all made of corrosion-resistant materials, a detachable recovery bottle is provided at the diverter port below the tee, and a cooling sleeve is provided on the outer wall of the detachable recovery bottle.

[0007] As an improvement, the cooling jacket and the condensation shell are both connected to the condensate supply device through a condensation pipeline.

[0008] As an improvement, the water inlet of the condensation shell is located below the inclined condensation tube bracket, and the water inlet and the water outlet of the condensation shell are opposite to each other.

[0009] As an improvement, the bottle mouth of the detachable recovery bottle is sealed and connected to the liquid outlet of the three-way pipe through a corrosion-resistant sealing ring.

[0010] As an improvement, the supporting end of the inclined condenser tube bracket is provided with a slide groove for fixing the condenser tube structure.

[0011] As an improvement, a gas one-way valve is provided between the distillation tower and the gas inlet of the condensation pipeline structure.

[0012] The advantages of the utility model compared with the prior art are: the device connects the condensate collection port and the liquid outlet of the branch condenser pipe by welding, and puts the two into a condensation shell, and uses a welding device to weld them into an integrated structure, so that the condensation pipeline structure is in a cooling state throughout the whole process, ensuring that the dichlorosilane gas is in a constant temperature state throughout the liquefaction process, avoiding the secondary volatilization of the dichlorosilane gas, and similarly, a cooling jacket is put on the outside of the detachable recovery bottle to ensure that the dichlorosilane liquid in the detachable recovery bottle will not be vaporized and volatilized again. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model discloses a general structural diagram of a trichlorosilane light removal distillation cooling device.

[0014] Figure 2 The utility model discloses a condensation pipeline structure cross-sectional view of a trichlorosilane light removal distillation cooling device.

[0015] Figure 3It is an exploded diagram of the condensation pipeline structure of a trichlorosilane light removal distillation cooling device of the utility model.

[0016] Figure 4 The utility model discloses a sectional view of a detachable recovery bottle of a trichlorosilane light removal distillation cooling device.

[0017] As shown in the figure: 1. Distillation tower; 2. Condensation device; 21. Condensate supply device; 22. Condensate pipeline structure; 221. Diverter condenser; 222. Condensate shell; 223. Air inlet shell; 224. Condensate collection port; 23. Slanted condenser bracket; 231. Slide; 3. Waste gas purification device; 4. Corrosion-resistant pipeline; 5. Tee pipe; 6. Removable recovery bottle; 7. Cooling jacket; 8. Gas one-way valve. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] As the instruction manual Figure 1 , 4 As shown, it includes a distillation tower 1, a condensing device 2 and an exhaust gas purification device 3. The distillation tower 1 and the exhaust gas purification device 3 are connected to the condensing device 2 through a corrosion-resistant pipe 4. A gas one-way valve 8 is provided between the distillation tower 1 and the air inlet of the condensing pipe structure 22. The gas one-way valve 8 is installed at the air outlet end of the distillation tower 1. The gas one-way valve 8 ensures that the gas will not reflux due to the stop of the distillation tower 1 after entering the corrosion-resistant pipe 4.

[0020] A three-way pipe 5 is provided between the water outlet of the diversion condenser 221 and the corrosion-resistant pipe 4. The three-way pipe 5 is made of corrosion-resistant material. A detachable recovery bottle 6 is provided at the diversion port below the three-way pipe 5. A cooling sleeve 7 is provided on the outer wall of the detachable recovery bottle 6. The bottle mouth of the detachable recovery bottle 6 is sealed and connected to the liquid outlet of the three-way pipe 5 through a corrosion-resistant sealing ring. The bottle mouth of the detachable recovery bottle 6 is put on the opening of the three-way pipe 5 with the open end facing downward. A corrosion-resistant sealing ring is used to ensure that it does not leak. The cooling sleeve 7 is put on the outside of the bottle body of the detachable recovery bottle 6. The cooling sleeve 7 is connected to the condensate supply device 21 using a condensation pipe to ensure that the liquid in the detachable recovery bottle 6 does not evaporate again (the uncooled exhaust gas enters the exhaust gas purification device 3 from the other opening of the three-way pipe 5 for purification).

[0021] As the instruction manual Figure 1 , 2As shown in FIG. 3 , the condensing device 2 includes a condensate supply device 21, a condensing pipe structure 22, and an inclined condensing pipe bracket 23 supporting the condensing pipe structure 22. The supporting end of the inclined condensing pipe bracket 23 is provided with a slide groove 231 for fixing the condensing pipe structure 22. The water inlet of the condensing shell 222 is located below the inclined condensing pipe bracket 23. The water inlet and the water outlet of the condensing shell 222 are opposite to each other. The water outlet of the condensing pipe structure 22 is inserted into the inclined condensing pipe bracket 2 The water outlet of the condensing pipe structure 22 is inserted into the chute 231 of the long cylindrical surface of the condensing pipe bracket 23, so that the condensing pipe structure 22 is in a structure of sliding down the slope, so as to facilitate the one-way flow of the dichlorosilane liquid. Because the water inlet of the condensing shell 222 is located below the inclined condensing pipe bracket 23, the branch pipe of the shunt condensing pipe 221 in the condensing shell 222 can be completely immersed in the coolant, ensuring that the branch pipe of the shunt condensing pipe 221 can be evenly cooled.

[0022] The condensation pipeline structure 22 includes a shunt condenser 221, a condensation shell 222, an air inlet shell 223 and a condensate collection port 224. The shunt condenser 221 and the air inlet shell 223 are made of corrosion-resistant materials. The shunt condenser 221 and the condensate collection port 224 pass through the interior of the condensation shell 222. The air inlet shell 223 and the condensate collection port 224 are connected to the two side end faces of the shunt condenser 221, the shunt condenser 221 and the inlet end of the condensation shell 222, and the outlet of the condensate collection port 224 and the liquid outlet of the condensation shell 222. Both are connected by welding. The condensate collection port 224 and the air inlet shell 223 are respectively welded to the two sides of the diversion condenser 221 to form an integrated structure. The condensate collection port 224 and the diversion condenser 221 are inserted into the shell of the condensation shell 222, and the water outlet of the condensate collection port 224 is welded to the water outlet of the condensation shell 222 using an electric welding device. One side of the diversion condenser 221 is welded to the open end of the condensation shell 222 using an electric welding device, so that the condensation pipe structure 22 is an integrated structure as a whole to avoid air leakage during the condensation process.

[0023] During the specific implementation of the utility model, the condensate supply device 21 is started to cool the cooling jacket 7 and the shunt condenser 221. When the temperatures of the cooling jacket 7 and the shunt condenser 221 are constant, the distillation tower 1 is started. Through the fractionation of the distillation tower 1, the light gas enters the condensation device 2 through the light gas outlet at the top of the distillation tower 1. The dichlorosilane gas in the light gas is diverted by the shunt condenser 221 to become a small stream of gas that enters the shunt branch of the shunt condenser 221, thereby ensuring that the shunt condenser 221 has a better condensation effect. When the condensate flows out of the shunt condenser 221 and enters the condensate collection port 224, because there is coolant on the outer wall of the condensate collection port 224, the condensate is in a liquid state at all times before entering the three-way pipe 5 and the detachable recovery bottle 6. After the condensate enters the detachable recovery bottle 6, the cooling of the cooling jacket 7 ensures that the condensate will not evaporate again, thereby making the condensate have a better recovery efficiency.

[0024] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A trichlorosilane light removal distillation cooling device, comprising a distillation tower (1), a condensing device (2) and an exhaust gas purification device (3), wherein the distillation tower (1) and the exhaust gas purification device (3) are both connected to the condensing device (2) via a corrosion-resistant pipeline (4), and the condensing device (2) comprises a condensate supply device (21), a condensing pipeline structure (22) and an inclined condensing pipe bracket (23) supporting the condensing pipeline structure (22), characterized in that: A three-way pipe (5) is provided between the water outlet of the condensation pipe structure (22) and the corrosion-resistant pipe (4); the condensation pipe structure (22) comprises a shunt condensation pipe (221), a condensation shell (222), an air inlet shell (223), and a condensate collection port (224); the shunt condensation pipe (221) and the condensate collection port (224) both pass through the interior of the condensation shell (222); the air inlet shell (223) and the condensate collection port (224) are connected to the shunt condensation pipe (221), the condensation shell (222), the air inlet shell (223), and the condensate collection port (224). The end surfaces of both sides of the condenser tube (221), the inlet end of the shunt condenser tube (221) and the condensation shell (222), and the outlet of the condensate collection port (224) and the liquid outlet of the condensation shell (222) are all connected by welding; the shunt condenser tube (221), the air inlet shell (223) and the three-way pipe (5) are all made of corrosion-resistant materials, the lower shunt port of the three-way pipe (5) is provided with a detachable recovery bottle (6), and the outer wall of the detachable recovery bottle (6) is provided with a cooling jacket (7).

2. A trichlorosilane light removal distillation cooling device according to claim 1, characterized in that: The cooling jacket (7) and the condensation shell (222) are both connected to the condensate supply device (21) via a condensation pipeline.

3. A trichlorosilane light removal distillation cooling device according to claim 2, characterized in that: The water inlet of the condensation shell (222) is located below the inclined condensation tube bracket (23), and the water inlet and the water outlet of the condensation shell (222) are opposite to each other.

4. A trichlorosilane light removal distillation cooling device according to claim 1, characterized in that: The bottle mouth of the detachable recovery bottle (6) is sealed and connected to the liquid outlet of the three-way pipe (5) via a corrosion-resistant sealing ring.

5. A trichlorosilane light removal distillation cooling device according to claim 1, characterized in that: The supporting end of the inclined condenser pipe bracket (23) is provided with a slide groove (231) for fixing the condenser pipe structure (22).

6. A trichlorosilane light removal distillation cooling device according to claim 1, characterized in that: A gas one-way valve (8) is provided between the distillation tower (1) and the gas inlet of the condensation pipeline structure (22).

Images