A tail gas recovery device for producing an organosilane coupling agent

Abstract

The utility model provides a kind of tail gas recovery device for organosilicon coupling agent production, including air inlet pipe, condenser shell, cooling jacket and liquid collecting tank, the air inlet pipe is fixed in condenser shell top and is communicated with it, the cooling jacket is fixed on the surface of condenser shell, the bottom of condenser shell is communicated with the top of liquid collecting tank and is fixed, the lower middle part of liquid collecting tank is designed in conical structure, the lateral wall of liquid collecting tank is communicated with outlet pipe, the inner wall of condenser shell is fixed with three equidistant distribution mounting bracket, the inner wall of mounting bracket is fixed with multiple baffles, the inner wall of cooling jacket is fixed with spiral pipe, the both ends of spiral pipe are penetrated out of cooling jacket, liquid level sensor is installed in the lateral wall of liquid collecting tank.The utility model prolongs gas residence time by wave baffle and countercurrent refrigerant design, optimizes heat exchange efficiency, reduces energy consumption.

Description

Technical Field

[0001] This utility model belongs to the field of organosilane coupling agent production technology, specifically relating to a tail gas recovery device for organosilane coupling agent production. Background Technology

[0002] Organosilane coupling agents are compounds that contain both organic functional groups and hydrolyzable siloxane groups in their molecules. During the production of organosilane coupling agents, reactions such as chlorination and hydrolysis of silane monomers release tail gases containing hydrogen chloride, unreacted silane monomers, and volatile organic compounds. Hydrogen chloride is highly corrosive; direct emission will corrode equipment and cause acid rain pollution. Uncondensed silane monomers and solvents not only waste raw materials, but their VOCs can also participate in photochemical reactions to generate ozone, threatening the ecological environment. Therefore, it is necessary to condense and recover the tail gases. By recovering the silane monomers and purifying HCl from the tail gases, production costs can be reduced.

[0003] In the process of exhaust gas condensation and recovery treatment, condensation devices are often required. However, existing condensation devices mostly adopt shell-and-tube or coil-type structures, in which the airflow passes through the condenser in a straight line, resulting in a short residence time, insufficient condensation of high-boiling-point silane monomers, co-flow of refrigerant and airflow, low utilization of heat transfer temperature difference, and narrow gaps between the tubes, which leads to the accumulation of dust and condensate and requires frequent shutdowns for cleaning. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a tail gas recovery device for the production of organosilane coupling agents, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A tail gas recovery device for the production of organosilane coupling agents includes an inlet pipe, a condenser shell, a cooling jacket, and a liquid collection tank. The inlet pipe is fixed to and communicates with the top of the condenser shell. The cooling jacket is fixed to the surface of the condenser shell. The bottom of the condenser shell communicates with and is fixed to the top of the liquid collection tank. The lower middle part of the liquid collection tank has a conical structure design. An outlet pipe is connected to the side wall of the liquid collection tank. Three equally spaced mounting brackets are fixed to the inner wall of the condenser shell. Multiple baffles are fixed to the inner wall of the mounting brackets.

[0007] In a preferred embodiment, a spiral tube is fixed to the inner wall of the cooling jacket, with both ends of the spiral tube extending through the cooling jacket, and a liquid level sensor is installed on the side wall of the liquid collection tank.

[0008] In a preferred embodiment, a temperature sensor is installed on the surface of the outlet pipe, a controller is installed on the front side of the liquid collection tank, and an automatic drain valve is connected to the bottom of the liquid collection tank.

[0009] In a preferred embodiment, a primary filter box is fixedly connected to the surface of the air intake pipe, a mounting shell is fixed to the inner wall of the primary filter box, a filter screen is slidably connected to the inner wall of the mounting shell, and the right side of the mounting shell has an open structure design.

[0010] As a preferred embodiment, a perforated plate for uniform airflow distribution is fixed at the connection between the air intake pipe and the condenser housing.

[0011] As a preferred embodiment, the primary filter box has a slot on the right side, and a cover plate is slidably connected to the inner wall of the slot.

[0012] As a preferred embodiment, an annular tube is fixed to the top of the inner wall of the condenser housing, and multiple nozzles are connected to the bottom of the annular tube.

[0013] In a preferred embodiment, the top of the annular tube is connected to a connecting pipe, which penetrates the condenser housing.

[0014] As a preferred embodiment, a valve is installed on the surface of the connecting pipe at the top of the annular pipe.

[0015] As a preferred embodiment, a sealing gasket is fixed to the slotted surface of the primary filter box, and threaded holes are provided on both the cover plate and the slotted surface.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention significantly improves the recovery rate of organosilanes through multi-stage filtration and efficient condensation, reduces the emission of toxic and harmful gases, and extends the gas residence time by using a corrugated baffle and counter-current refrigerant design to optimize heat exchange efficiency and reduce energy consumption. The spray cleaning system and removable filter extend the service life of the equipment, reduce maintenance frequency, and ensure continuous production. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a partial cross-sectional structural diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the specific cross-sectional structure of the baffle plate in this utility model;

[0022] Figure 5 This is a partial split-section structural diagram of the present invention.

[0023] The diagram shows: 1. Inlet pipe; 2. Condenser housing; 3. Cooling jacket; 4. Liquid collection tank; 5. Outlet pipe; 6. Mounting bracket; 7. Baffle plate; 8. Spiral tube; 9. Automatic drain valve; 10. Liquid level sensor; 11. Controller; 12. Temperature sensor; 13. Primary filter box; 14. Mounting shell; 15. Filter screen; 16. Perforated plate for uniform airflow; 17. Cover plate; 18. Sealing gasket; 19. Threaded hole; 20. Annular tube; 21. Valve; 22. Nozzle. Detailed Implementation

[0024] The specific embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0025] Please see Figures 1 to 5 As shown, this utility model embodiment provides a tail gas recovery device for the production of organosilane coupling agents, specifically including an inlet pipe 1, a condenser shell 2, a cooling jacket 3, and a liquid collection tank 4. The inlet pipe 1 is fixed to the top of the condenser shell 2 and communicates with it. The cooling jacket 3 is fixed to the surface of the condenser shell 2. The bottom of the condenser shell 2 is communicated with and fixed to the top of the liquid collection tank 4. The lower middle part of the liquid collection tank 4 has a conical structure design. The side wall of the liquid collection tank 4 is connected to the outlet pipe 5. Three equally spaced mounting brackets 6 are fixed to the inner wall of the condenser shell 2. Multiple baffles 7 are fixed to the inner wall of the mounting brackets 6. The multiple mounting brackets 6 are spaced 600mm apart. The baffles 7 are tilted at an angle of 30° and are stamped with a wavy design. A spiral tube 8 is fixed to the inner wall of the cooling jacket 3. Both ends of the spiral tube 8 pass through the cooling jacket 3. The bottom end of the spiral tube 8 is the refrigerant inlet and the top end is the refrigerant outlet. A liquid level sensor 10 is installed on the side wall of the liquid collection tank 4. The probe of the liquid level sensor 10 penetrates into the interior of the liquid collection tank 4. A temperature sensor 12 is installed on the surface of the outlet pipe 5. The probe of the temperature sensor 12 penetrates into the interior of the outlet pipe 5. A controller 11 is installed on the front side of the surface of the liquid collection tank 4. An automatic drain valve 9 is connected to the bottom of the liquid collection tank 4.

[0026] Specifically, in this embodiment, after the exhaust gas enters the condenser housing 2 from the inlet pipe 1, under the action of three equidistantly distributed mounting brackets 6 and baffles 7, the airflow is forced to form an "S"-shaped flow path along the 30° inclined wavy baffles 7, prolonging the gas residence time. The spiral tube 8 in the cooling jacket 3 injects a low-temperature medium, such as ethylene glycol solution, through the refrigerant inlet. The refrigerant circulates counter-currently from bottom to top along the spiral tube 8, exchanging heat with the high-temperature exhaust gas through the wall of the condenser housing 2, causing the high-boiling-point organosilicon monomer to condense and liquefy. The droplets slide down the surface of the baffles 7 to the conical bottom of the liquid collection tank 4. When the liquid level sensor 10 detects that the liquid level has reached the set value... At high altitude, the controller 11 triggers the automatic drain valve 9 to open the drain; the uncondensed low-boiling-point gas is discharged through the outlet pipe 5 and enters the subsequent tail gas treatment equipment. The temperature sensor 12 monitors the exhaust temperature in real time to ensure the stable operation of the downstream treatment unit. The corrugated baffle 7 significantly increases the gas-solid contact area, and combined with the counter-current refrigerant design of the spiral tube 8, it improves the heat exchange efficiency and silane recovery rate. The conical liquid collection tank 4, together with the automatic drain valve 9, realizes continuous draining and avoids manual intervention. The temperature sensor 12 and the liquid level sensor 10 form a closed-loop control to ensure the safety and processing stability of the device, while reducing the escape of harmful components in the tail gas.

[0027] Please see Figures 1 to 5 As shown, a primary filter box 13 is fixedly connected to the surface of the intake pipe 1. A mounting shell 14 is fixed to the inner wall of the primary filter box 13. A filter screen 15 is slidably connected to the inner wall of the mounting shell 14. The right side of the mounting shell 14 has an open structure design, and the mounting shell 14 is tilted at an angle of 30°. In this embodiment, the exhaust gas first passes through the filter screen 15 installed at a 30° angle before entering the device. The tilted installation design utilizes gravity to assist dust to slide off. The filter screen 15 adopts a metal woven mesh structure to intercept dust particles and large polymer molecules carried in the exhaust gas, effectively reducing the dust load entering the condenser shell 2, reducing the risk of surface contamination and blockage of the baffle plate 7, and extending the continuous operation cycle of the device. The filter screen 15 can be slidably pulled out along the mounting shell 14 for easy periodic cleaning or replacement.

[0028] Please see Figures 1 to 5 As shown, a perforated plate 16 for uniform airflow distribution is fixed at the connection between the intake pipe 1 and the condenser shell 2. The perforated plate 16 has uniformly distributed circular holes of the same diameter on its surface, which makes the flow velocity of the exhaust gas uniform when it enters the condenser shell 2, eliminating airflow deviation or eddy phenomena. The uniformly distributed airflow covers most of the baffle plate 7 area, reducing local overheating or insufficient condensation, improving the utilization rate of the heat exchange area inside the condenser shell 2, and ensuring a stable silane monomer recovery rate.

[0029] Please see Figures 1 to 5As shown, a slot is provided on the right side of the primary filter box 13, and a cover plate 17 is slidably connected to the inner wall of the slot. The slot on the right side of the primary filter box 13 is slidably connected to the cover plate 17. When the cover plate 17 is closed, it achieves airtightness to prevent exhaust gas leakage. When the filter screen 15 needs to be cleaned, the cover plate 17 is slid out along the slot, and the filter screen 15 can be pulled out. An annular pipe 20 is fixed to the top of the inner wall of the condenser shell 2. Multiple nozzles 22 are connected to the bottom of the annular pipe 20, and a connecting pipe is connected to the top of the annular pipe 20, which passes through the condenser shell 2. The annular pipe 20 is connected to the cleaning fluid through the external connecting pipe. The cleaning fluid is distributed to the multiple nozzles 22 through the annular pipe 20 to form a uniform spray water flow to wash the surface of the baffle plate 7. The spray can dissolve or wash away the residual silane polymer and dust on the plate surface. The cleaning wastewater is discharged through the collection tank 4. A valve 21 is installed on the surface of the connecting pipe at the top of the annular pipe 20. The valve 21 is installed on the connecting pipe at the top of the annular pipe 20. During normal operation, the valve 21 is closed to prevent exhaust gas from entering the cleaning pipeline. During cleaning, the valve 21 is opened to adjust the flow rate and pressure of the cleaning fluid.

[0030] Please see Figures 1 to 5 As shown, a sealing gasket 18 is fixed on the slotted surface of the primary filter box 13. Both the cover plate 17 and the slotted surface are provided with threaded holes 19. The sealing gasket 18 is made of corrosion-resistant rubber and is embedded in the edge of the slot of the primary filter box 13. When the cover plate 17 is closed, it compresses the sealing gasket 18 to form a tight seal. Then, the sealing gasket 18 is further tightened by bolts to ensure that there is no gas leakage in the negative pressure environment inside the primary filter box 13.

[0031] This invention is specifically designed for the primary condensation and recovery stage of exhaust gas from organosilane coupling agent production. The exhaust gas generated during organosilane coupling agent production enters the device through the inlet pipe 1. First, it passes through the filter screen 15 in the primary filter box 13, which intercepts dust and large particulate impurities. The filtered exhaust gas is then evenly distributed into the condenser shell 2 via the airflow distribution perforated plate 16. Three layers of 30° inclined corrugated baffles 7 installed inside the condenser shell 2 force the airflow into an "S" shaped path, significantly extending the gas residence time. A low-temperature refrigerant is continuously introduced through the spiral tube 8 in the cooling jacket 3. The refrigerant circulates counter-currently to absorb heat from the exhaust gas, causing the high-boiling-point organosilane monomers to condense into droplets. The droplets then flow along... The baffle plate 7 slides down to the conical collection tank 4. When the liquid level sensor 10 detects that the liquid level has reached the threshold, the controller 11 activates the automatic drain valve 9 to discharge the liquid product. The uncondensed low-temperature gas is transported to the downstream processing unit through the outlet pipe 5. The temperature sensor 12 monitors the exhaust temperature in real time and feeds it back to the control system. During regular maintenance, the valve 21 of the annular pipe 20 is opened, and the nozzle 22 sprays cleaning fluid to wash the dirt on the surface of the baffle plate 7. The cleaning waste liquid is discharged through the collection tank 4. The filter screen 15 of the primary filter box 13 can be slid out for cleaning. The cover plate 17 ensures sealing through the sealing gasket 18 and the threaded hole 19. The whole process realizes efficient and low-consumption exhaust gas resource recovery.

[0032] Although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these specific embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tail gas recovery device for the production of organosilane coupling agents, comprising an inlet pipe (1), a condenser shell (2), a cooling jacket (3), and a collection tank (4), characterized in that: The air inlet pipe (1) is fixed to the top of the condenser housing (2) and communicates with it. The cooling jacket (3) is fixed to the surface of the condenser housing (2). The bottom of the condenser housing (2) is connected to the top of the liquid collection tank (4) and is fixed. The liquid collection tank (4) has a conical structure design in the lower middle part. The side wall of the liquid collection tank (4) is connected to the outlet pipe (5). The inner wall of the condenser housing (2) is fixed with three equally spaced mounting brackets (6). The inner wall of the mounting brackets (6) is fixed with multiple baffles (7).

2. The tail gas recovery device for the production of organosilane coupling agents according to claim 1, characterized in that: The inner wall of the cooling jacket (3) is fixed with a spiral tube (8), both ends of which extend through the cooling jacket (3). A liquid level sensor (10) is installed on the side wall of the liquid collection tank (4).

3. The tail gas recovery device for the production of organosilane coupling agents according to claim 1, characterized in that: A temperature sensor (12) is installed on the surface of the outlet pipe (5), a controller (11) is installed on the front side of the surface of the liquid collection tank (4), and an automatic drain valve (9) is connected to the bottom of the liquid collection tank (4).

4. The tail gas recovery device for the production of organosilane coupling agents according to claim 1, characterized in that: The intake pipe (1) is connected to and fixed with a primary filter box (13). The inner wall of the primary filter box (13) is fixed with a mounting shell (14). The inner wall of the mounting shell (14) is slidably connected with a filter screen (15). The right side of the mounting shell (14) has an open structure design.

5. The tail gas recovery device for the production of organosilane coupling agents according to claim 1, characterized in that: A perforated plate (16) for uniform airflow distribution is fixed at the connection between the air intake pipe (1) and the condenser shell (2).

6. The tail gas recovery device for the production of organosilane coupling agents according to claim 4, characterized in that: The primary filter box (13) has a slot on the right side, and a cover plate (17) is slidably connected to the inner wall of the slot.

7. The tail gas recovery device for the production of organosilane coupling agents according to claim 1, characterized in that: The top of the inner wall of the condenser housing (2) is fixed with an annular tube (20), and the bottom of the annular tube (20) is connected to multiple nozzles (22).

8. The tail gas recovery device for the production of organosilane coupling agents according to claim 7, characterized in that: The top of the annular tube (20) is connected to a connecting pipe, which penetrates the condenser shell (2).

9. The tail gas recovery device for the production of organosilane coupling agents according to claim 7, characterized in that: A valve (21) is installed on the surface of the connecting pipe at the top of the annular pipe (20).

10. The tail gas recovery device for the production of organosilane coupling agents according to claim 6, characterized in that: The primary filter box (13) has a sealing gasket (18) fixed on the slotted surface, and the cover plate (17) and the slotted surface are both provided with threaded holes (19).

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