Efficient self-cleaning nanometer silicon carbide filler rectifying device

Abstract

The utility model relates to a kind of high-efficiency self-cleaning nanometer silicon carbide packing rectification device, including rectification tower, rectification tower top and bottom are respectively set rectification tower reboiler and tower top condenser, rectification tower inner lower portion's feed section and rectification section between upper portion are set two above and below sections of stripping section, each section of stripping section includes nanometer silicon carbide upper packing section and ceramic baohuan ring lower packing section, degassing tower bottom reboiler is connected with feed pipe, and two-way above is connected with rectification tower, one way is connected with the feed section under stripping section via feed valve and / or feed pump, and other one way above is respectively connected with two above stripping section upper rectification tower inner set backflushing nozzle via shield pump. Its structure is simple, can realize rectification tower packing online flushing, and comprehensively improve rectification product purity.

Description

Technical Field

[0001] This utility model relates to a distillation apparatus, specifically a high-efficiency self-cleaning nano-silicon carbide packed distillation apparatus. Background Technology

[0002] In existing distillation technologies for difluorochloroethane, the packing material in the distillation column is mainly stainless steel wire mesh or ceramic Pall rings. After a period of use, scale accumulates on the surface of the packing material, affecting the product separation and purification effect, leading to a decrease in the purity of difluorochloroethane and an increase in energy consumption. Summary of the Invention

[0003] This invention provides a simple structure that enables online flushing of distillation column packing, ensuring improved and stable purity of distillation products. It is a highly efficient self-cleaning nano-silicon carbide packing distillation device.

[0004] The technical solution adopted by this utility model is: a high-efficiency self-cleaning nano-silicon carbide packed distillation device, including a distillation column, with a distillation column reboiler and a column top condenser respectively installed at the top and bottom of the distillation column. The feature is that: two or more stripping sections are arranged vertically between the lower feed section and the upper distillation section in the distillation column. Each stripping section includes a nano-silicon carbide upper packing section and a ceramic Pall ring lower packing section. The feed pipe from the bottom reboiler of the degassing column is divided into two or more paths connected to the distillation column. One path is connected to the feed section below the stripping section via a feed valve and / or a feed pump. The other paths are connected to the backwash nozzles installed in the distillation column above the two or more stripping sections via shielded pumps.

[0005] Furthermore, the bottom of the reboiler of the distillation column is connected to two branches: one branch is connected back to the reboiler below the degassing column, and the other branch is connected to the high-boiling-point evaporator.

[0006] Furthermore, the bottom of the column top condenser is connected to two paths: one path connects to the top of the distillation column via a return valve and / or a return pump, and the other path connects to the finished product metering tank via a finished product valve and / or a finished product valve.

[0007] Furthermore, the finished product metering tank is connected to two or more backwash nozzles above two or more backwash nozzles via two or more high-purity reflux pumps.

[0008] Furthermore, the finished product metering tank is connected to a reflux nozzle located above the feed section via a high-purity reflux pump.

[0009] Furthermore, the distillation section includes a nano-silicon carbide upper packing section and a ceramic Pall ring lower packing section.

[0010] Furthermore, there is an outlet gas receiving cabinet above the condenser at the top of the tower.

[0011] The beneficial effects of this utility model are: 1. The stripping section uses a combination of nano-silicon carbide packing and ceramic Pall ring packing. Backwash nozzles are installed above both the feed section and the stripping section. During the operation of the distillation column, backwashing is performed periodically. The degassed difluoroethane containing difluoroethane and difluorodichloroethane is pumped from other routes on the feed pipe via a shielded pump to the backwash nozzles to backwash the stripping section packing. The online, efficient cleaning and rinsing does not require shutdown, which helps to improve the performance and life of the packing, while also improving the rectification and stripping effect.

[0012] 2. The reflux liquid at the top of the column contains high-purity difluorochloroethane. It comes into countercurrent contact with the rising steam, dissolving the light component impurities of difluoroethane carried in the steam and allowing it to flow downwards into the stripping section. This effectively reduces the light component of difluoroethane, which is condensed by the top steam and enters the finished product metering tank, thereby improving the purity of difluorochloroethane in the finished product metering tank.

[0013] 3. High-purity difluorochloroethane is fed into the stripping section via the finished product metering tank and reflux nozzle, thereby enhancing the distillation section's ability to remove light difluoroethane components. This further increases the difluorochloroethane content in the overhead steam sent to the overhead condenser, thus further improving the purity of difluorochloroethane recovered and sent to the finished product metering tank. Combined with the reflux above the distillation section, this comprehensively improves the enrichment of light difluoroethane components in the liquid phase circulation. Once the light component accumulation threshold is reached, it enters the overhead condenser along with the overhead steam. The overhead condenser then sends the gaseous difluoroethane to the gas holder for further processing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram: 1. Degassing tower; 2. Degassing tower reboiler; 3. Feed pipe; 4. Feed valve; 5. Distillation tower; 6. Feed section; 7. Stripping section; 8. Nano-silicon carbide upper packing section; 9. Ceramic Pall ring lower packing section; 10. Distillation section; 11. Backwash nozzle; 12. Shielded pump; 13. Return liquid nozzle; 14. Tower top condenser; 15. Gas holder; 16. Return valve; 17. Product valve; 18. Product metering tank; 19. Reflux pump; 20. Distillation tower reboiler; 21. High-boiling-point reboiler. Detailed Implementation

[0016] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0017] Figure 1 As shown: A high-efficiency self-cleaning nano-silicon carbide packed distillation device includes a distillation column 5, a column top condenser 14, a gas holder 15, a return valve 16, a product valve 17, a product metering tank 18, a reflux pump 19, a distillation column reboiler 20, and a high-boiling-point reboiler 21.

[0018] The distillation column 5 is equipped with a reboiler 20 at the top and a condenser 14 at the bottom. Two stripping sections 7 are located between the lower feed section 6 and the upper rectification section 5 within the distillation column 5. Both the rectification and stripping sections include a nano-silicon carbide upper packing section 8 and a ceramic Pall ring lower packing section 9. The feed pipe from the degassing column 1's reboiler 2 at the bottom is split into two branches connected to the distillation column 5. One branch connects to the feed section 6 below the stripping section via a feed valve 4 and / or a feed pump. The other branch connects to the backwash nozzle 11 located above the lowest stripping section 7 within the distillation column via a shielded pump 12. The bottom of the distillation column reboiler 20 is split into two branches: one branch returns to the degassing column reboiler 2, and the other branch sends material to the high-boiling-point evaporator 21. The gas outlet above the top condenser 14 is connected to the gas cabinet. The bottom of the top condenser 14 is split into two paths. One path goes through the return valve 16 and / or the return pump to the top of the distillation column 5. The other path goes through the product valve 17 and / or the product metering tank 18. The product metering tank 18 is connected to three reflux nozzles 13 via the reflux pump 19. The three reflux nozzles 13 are respectively located above the feed section 6 and the two stripping sections 7. The reflux nozzle 13 above the lowest stripping section is higher than the backwash nozzle 11.

[0019] In this embodiment, the pumps and valves are only configured to meet the basic function of conveying. In actual industrial production, pumps, valves and other safety components need to be installed on each pipeline. This embodiment does not describe in detail the pumps and valves connecting the various components. Any changes to the interaction, combination and mixed use of various pumps and valves on each conveying pipeline are within the protection scope of this embodiment.

Claims

1. A high-efficiency self-cleaning nano-silicon carbide packed distillation apparatus, comprising a distillation column, wherein a reboiler and a top condenser are respectively provided at the top and bottom of the distillation column, characterized in that: The distillation column is provided with two or more stripping sections between the lower feed section and the upper rectification section. Each stripping section includes a nano-silicon carbide upper packing section and a ceramic Pall ring lower packing section. The feed pipe from the reboiler at the bottom of the degassing tower is divided into two or more paths to the distillation column. One path is connected to the feed section below the stripping section via a feed valve and / or a feed pump. The other paths are connected to the backwash nozzles installed in the distillation column above the two or more stripping sections via shielded pumps.

2. The high-efficiency self-cleaning nano-silicon carbide packed distillation apparatus according to claim 1, characterized in that: The bottom of the reboiler of the distillation column is split into two branches: one branch is connected back to the reboiler below the degassing column, and the other branch is connected to the high-boiling-point evaporator.

3. The high-efficiency self-cleaning nano-silicon carbide packed distillation apparatus according to claim 1, characterized in that: The bottom of the condenser at the top of the column is connected to two paths: one path goes through a return valve and / or a return pump to the top of the distillation column, and the other path goes through a finished product valve and / or a finished product metering tank.

4. The high-efficiency self-cleaning nano-silicon carbide packed distillation apparatus according to claim 3, characterized in that: The finished product metering tank is connected to two or more high-purity reflux pumps, which are respectively connected to reflux nozzles set above two or more backwash nozzles.

5. A high-efficiency self-cleaning nano-silicon carbide packed distillation apparatus according to claim 3 or 4, characterized in that: The finished product metering tank is connected to a reflux nozzle located above the feed section via a high-purity reflux pump.

6. The high-efficiency self-cleaning nano-silicon carbide packed distillation apparatus according to claim 1, characterized in that: The distillation section includes a nano-silicon carbide upper packing section and a ceramic Pall ring lower packing section.

7. The high-efficiency self-cleaning nano-silicon carbide packed distillation apparatus according to claim 1, characterized in that: The gas outlet and gas receiving cabinet is located above the condenser at the top of the tower.

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