Resin recycling device
A system for recovering and reusing amine functionalized ion exchange resins in polysilicon production by depressurization, filtration, washing, and drying ensures safe and efficient resin recovery without damage, addressing the lack of effective resin reuse methods.
Patent Information
- Application Number
- CN202422229671.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-11
AI Technical Summary
There is a lack of effective devices and methods in the prior art to recover and reuse tertiary amino ion exchange resins used in polysilicon production, especially disproportionate resins, and there are safety risks and resource waste problems.
A resin recycling and reuse device is designed, including a resin receiving tank, reactor, conveying pump, filter, heater and Johnson Net. Through steps such as pressure reduction, filtration, washing and drying, the resin is safe and efficiently recovered, avoiding damaging the resin and reducing the generation of hazardous waste.
The complete recycling of disproportionate resins is achieved, which reduces safety risks, saves resources, avoids the generation of hazardous waste, and is environmentally friendly and energy-saving in the treatment process.
Smart Images
Figure CN223096762U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of machinery, in particular to a resin recycling device. Background Art
[0002] Resin refers to a tertiary amino ion exchange resin added in a fixed bed reactor during polysilicon production. In the process of implementing the present utility model, it is found that there is no existing device for recycling and reusing disproportionated resin. Content of the Utility Model
[0003] In view of this, the embodiment of the present utility model provides an energy-saving rectification system, which can completely recycle disproportionated resin without damaging the resin.
[0004] To achieve the above object, according to an embodiment of the present utility model, a resin recycling device is provided, including a resin receiving tank, a reactor, a delivery pump, a filter, a heater, and a Johnson screen; wherein, the upper part of the resin receiving tank is connected to the bottom end of the reactor, a filter is provided on the discharge pipeline at the top end of the resin receiving tank, and an inert gas introduction pipeline is connected to the discharge pipeline between the filter and the resin receiving tank, and a heating pipeline connecting to the heater is provided at the bottom end of the resin receiving tank; the upper part of the reactor is connected to the delivery pump, an inert gas introduction pipeline is connected to the discharge pipeline at the top end of the reactor, and a liquid discharge pipeline with a Johnson screen installed is further provided at the bottom end of the reactor.
[0005] Optionally, it includes: a liquid discharge pipeline with a filter installed is provided at the bottom end of the resin receiving tank, and the liquid discharge pipeline of the resin receiving tank is connected to the pipeline between the reactor and the delivery pump.
[0006] Optionally, it includes: pressure gauges are respectively installed before and after the filter on the liquid discharge pipeline of the resin receiving tank.
[0007] Optionally, it includes: a ball valve connected in parallel with the filter is installed on the liquid discharge pipeline of the resin receiving tank, and a drain port is provided on the ball valve.
[0008] Optionally, it includes: pressure regulating valves are respectively provided on the inert gas introduction pipelines connected to the top discharge pipelines of the resin receiving tank and the reactor.
[0009] Optionally, it includes: safety valves connected through vent valves are respectively provided at the tops of the resin receiving tank and the reactor.
[0010] Optionally, it includes: level transmitters are respectively installed on the resin receiving tank and the reactor.
[0011] Optionally, it includes: pressure gauges are respectively installed on the resin receiving tank and the reactor.
[0012] Optionally, it includes: on the pipeline connecting the resin receiving tank and the reactor, plug valves are installed respectively at positions close to the resin receiving tank and close to the reactor, and a ball valve is installed between the two plug valves.
[0013] Optionally, it includes: a drain port is provided on the ball valve installed between the two plug valves.
[0014] One embodiment of the above utility model has the following advantages or beneficial effects: The resin recovery and reuse device provided by the present utility model can recover disproportionated resin in a solution containing media such as trichlorosilane, dichlorosilane, and silane. Through intermittent treatment methods such as pressure reduction, filtration, washing, and drying, the recovery and reuse of resin are realized, reducing the safety risk of disproportionated resin recovery; moreover, when it is necessary to enter the reactor for inspection after a failure occurs in the reactor internals, the disproportionated resin in the reactor can be recovered. After the inspection is completed, the resin can be added back to the reactor again, realizing the complete recovery of disproportionated resin without damaging the resin. The recovery process is safe, efficient, and generates no hazardous waste, saving resources.
[0015] The further effects of the above non-conventional optional methods will be described below in combination with specific embodiments. Description of the Drawings
[0016] The drawings are used to better understand the present utility model and do not constitute an improper limitation to the present utility model. Among them:
[0017] Figure 1 is a schematic structural diagram of the resin recovery and reuse device according to an embodiment of the present utility model. Detailed Embodiments
[0018] The following makes an explanation of the exemplary embodiments of the present utility model in conjunction with the drawings, including various details of the embodiments of the present utility model to facilitate understanding. It should be considered that they are merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present utility model. Similarly, for the sake of clarity and conciseness, the descriptions of well-known functions and structures are omitted below.
[0019] At least one embodiment of the present utility model provides a resin recovery and reuse device. The resin recovery and utilization treatment method refers to internal maintenance of the resin storage reaction device after shutdown, transferring the resin out of the reactor. However, the resin contains chlorosilane medium and some light components with the risk of spontaneous combustion, and it is necessary to remove the residual chlorosilane in the resin without damaging the original properties of the resin. The resin is recovered by means of filtration, washing, drying, etc., as Figure 1As shown, the resin recycling and reuse device may include a resin receiving tank 1, a reactor 2, a transfer pump 3, a filter 4, a heater 5, and a Johnson screen 6. Among them, the filter 4 can be adjusted according to the actual situation of the user, and a Y-type filter, a pipeline filter, a basket filter, etc. can be used. The heater 5 can use an electric heater, heat transfer oil heating, natural gas heating, etc. Preferably, a vent valve 13 is installed on the pipeline where the filter 4 is provided.
[0020] In the embodiment, the upper part of the resin receiving tank 1 is connected to the bottom end of the reactor 2. A filter 4 is provided on the discharge pipeline at the top end of the resin receiving tank 1, and an inert gas (such as nitrogen, neon and other inert gases and non-combustible gases) introduction pipeline is connected to the discharge pipeline between the filter 4 and the resin receiving tank 1. A heating pipeline connected to the heater 5 is provided at the bottom end of the resin receiving tank 1. The upper part of the reactor 2 is connected to the transfer pump 3. An inert gas introduction pipeline is connected to the discharge pipeline at the top end of the reactor 2. A liquid discharge pipeline with a Johnson screen 6 installed is also provided at the bottom end of the reactor 2.
[0021] In some preferred embodiments, pressure valves 8 are respectively provided on the inert gas introduction pipelines connected to the discharge pipelines at the top ends of the resin receiving tank 1 and the reactor 2 of the resin recycling and reuse device of the present invention.
[0022] In other preferred embodiments, safety valves 9 connected through the vent valve 13 are respectively provided at the top ends of the resin receiving tank 1 and the reactor 2.
[0023] In still other embodiments, level transmitters 10 are respectively installed on the resin receiving tank 1 and the reactor 2. And in other embodiments, pressure gauges 12 are respectively installed on the resin receiving tank 1 and the reactor 2.
[0024] As a preferred embodiment of the present invention, the resin recycling and reuse device may further include stop valves 11 installed respectively at positions close to the resin receiving tank 1 and close to the reactor 2 on the pipeline connecting the resin receiving tank 1 and the reactor 2, and a ball valve 7 is installed between the two stop valves 11. Further, a drain port is provided on the ball valve 7 installed between the two stop valves 11, which can be used for sampling operations.
[0025] In still other preferred embodiments, a vent valve 13 is installed on the pipeline between the reactor 2 and the transfer pump 3. In addition, a stop valve 11 is installed on the liquid discharge pipeline with a Johnson screen 6 installed at the bottom end of the reactor 2.
[0026] As another embodiment of the present invention, as Figure 1 shown, the resin recycling and reuse device includes a liquid discharge pipeline with a filter 4 installed at the bottom end of the resin receiving tank 1, and the liquid discharge pipeline of the resin receiving tank 1 is connected to the pipeline between the reactor 2 and the transfer pump 3.
[0027] In a further embodiment, pressure gauges 12 are respectively installed before and after the filter 4 on the drain pipeline of the resin receiving tank 1.
[0028] In another embodiment, a ball valve 7 is installed in parallel with the filter 4 on the drain pipeline of the resin receiving tank 1.
[0029] In a further preferred embodiment, a ball valve 7 is provided between the pressure gauge 12 and the filter 4 on the drain pipeline of the resin receiving tank 1, which is far from the resin receiving tank 1. Preferably, a drain port is provided on the ball valve 7 between the pressure gauge 12 and the filter 4 on the drain pipeline of the resin receiving tank 1, which is far from the resin receiving tank 1.
[0030] It should be noted that a vent valve 13 is provided between the resin receiving tank 1 and the pressure gauge 12 close to the resin receiving tank 1 on the drain pipeline of the resin receiving tank 1, and a cock valve 11 is provided at the position where the drain pipeline of the resin receiving tank 1 is connected to the pipeline between the reactor 2 and the transfer pump 3.
[0031] Preferably, a part of the pipeline of the drain pipeline of the resin receiving tank 1 is shared with the heating pipeline of the heater 5 provided at the bottom end of the resin receiving tank 1. And a cock valve 11 is provided on this shared pipeline part. A vent valve 13 is also provided on the non-shared pipeline part included in the heating pipeline connected to the heater 5 at the bottom end of the resin receiving tank 1.
[0032] As an example: For the recovery of disproportionation resin (such as chlorosilane resin, which can also be used for the recovery of similar products) from hazardous chemicals such as dichlorodihydrogen silane and silane, the pipeline from the resin receiving tank 1 to the reactor 2 is opened through the cock valve 11, and the drain pipeline with the filter 4 installed at the bottom end of the resin receiving tank 1 is connected, and other pipelines are in the closed state, that is, the pressure test and the nitrogen pipeline are checked for smoothness, and the pressure is maintained for half an hour. If the pressure does not drop, it is regarded as passing the system airtight test. After the airtight test is completed, nitrogen purging is maintained until the oxygen content detection is qualified and the dew point detection is qualified, and the detection tube at the test inlet (such as a moisture detector) detects less than 0.1 mg / L.
[0033] Open the cock valve 11 on the drain pipeline at the bottom end of the reactor 2, and discharge the flammable light components in the reactor 2 to the storage tank area (D-2) through the filtration of the Johnson screen 6. Start the transfer pump 3 to transport the washing and dilution liquid into the reactor 2, and stop the pump after the liquid level reaches 60-80%.
[0034] The washing diluent is soaked in the reactor 2 for several hours to allow the washing diluent to fully contact the resin and dilute the light component of chlorosilane in the resin pores. Then, the plug valve 11 on the drain pipeline at the bottom of the reactor 2 is opened again, and the washing diluent is discharged to the storage tank area (D-2) through the filtration of the Johnson screen 6. Among them, the above steps can be repeated multiple times.
[0035] A drain port is provided on the ball valve 7 between the pressure gauge 12 and the filter 4 away from the resin receiving tank 1 on the drain pipeline of the resin receiving tank 1 for sampling. According to the sampling test results, the remaining amount of residual chlorosilane in the resin is determined. If the sampling analysis is qualified, the transfer of the resin is started, and 60-80% of the washing diluent is injected into the reactor 2 again through the transfer pump 3.
[0036] Open the vent valve 13 on the discharge pipeline at the top of the resin receiving tank 1 to maintain a slightly positive pressure state of the emptying valve. Open the plug valve 11 on the pipeline connecting the bottom end of the reactor 2 and the resin receiving tank 1 (this pipeline is outside the Johnson screen and does not have a filtering function, and can transfer the resin). Open the pressurizing valve 8 on the inert gas inlet pipeline connected to the discharge pipeline at the top end of the reactor 2, and transfer the resin and the washing diluent in the reactor 2 into the resin receiving tank 1 through liquid-solid transportation. Judge whether the transportation is completed according to the liquid level transmitter 10 on the reactor 2. After the transportation is completed, close the plug valve 11 on the pipeline connecting the bottom end of the reactor 2 and the resin receiving tank 1 and the pressurizing valve 8 on the inert gas inlet pipeline connected to the discharge pipeline at the top end of the reactor 2. Open the vent valve 9 at the top end of the reactor 2 to relieve pressure to a slightly positive pressure state, close the vent valve 9 at the top end of the resin receiving tank 1, and open the pressurizing valve 8 on the inert gas inlet pipeline connected to the discharge pipeline at the top end of the resin receiving tank 1 to boost the pressure of the resin receiving tank 1.
[0037] When the pressure of the resin receiving tank 1 rises to 100-300 kPa, connect the pipeline with the reactor 2, intercept the resin through the filter 4 on the drain pipeline at the bottom end of the resin receiving tank 1, and determine the pressure difference by using the pressure gauges 12 before and after the filter 4. When the pressure difference is too large, connect nitrogen through the drain port on the ball valve 7 downstream of the filter 4 for backwashing to clean the blockage, and discharge the diluted washing liquid back into the reactor 2 to perform a secondary rinse on the remaining resin. If the liquid level of the reactor 2 does not continue to rise, it proves that the transfer of the diluted washing liquid is completed. At this time, the diluted washing liquid has been transferred back into the reactor 2 again. By opening the plug valve 11 on the drain pipeline at the bottom end of the reactor 2, the washing diluent is discharged to the storage tank area (D-2) through the filtration of the Johnson screen 6. Among them, silicon tetrachloride can be used as the washing diluent.
[0038] At this time, the resin recovery is completed. The resin in the resin receiving tank 1 is dried by using hot nitrogen through the heating pipeline connected with the heater 5. When the water content of the resin is dried to be qualified, the resin can be transferred into a barrel for transfer and storage.
[0039] If the resin still needs to be transferred back after the overhaul of the reactor 2, drying is not required. At this time, the resin receiving tank 1 is kept under nitrogen seal for storage, and there is no need to drain the dilution washing liquid to the reactor 2 and the storage tank area (D-2). The resin is transferred back into the reactor 2 through the ball valve 7 bypass connected in parallel with the filter 4 on the drain pipeline of the resin receiving tank 1 for solid-liquid transportation. In addition, the completion of the transfer can be judged by the liquid level gauge.
[0040] To sum up, the resin recycling device of the present utility model recovers the resin containing flammable light components of chlorosilane through the washing and filtering method. The recovered resin can remove the chlorosilane medium, enabling it to be exposed to air at normal temperature and pressure. The treatment process is environmentally friendly, energy-saving, and does not generate hazardous waste. It will not cause resin breakage and waste due to too fast flow rate. The dilution solvent used will not damage the disproportionated resin, and there is no generation of other hazardous waste when contacting with the original solution in the equipment. At the same time, it makes up for the problems of difficult resin recovery and treatment, and reduces the investment amount of the enterprise. In addition, the solid-liquid transportation method can effectively protect the integrity of the resin, but the same gas-solid method is also applicable to the transportation of other media.
[0041] It should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", etc. in the present utility model can be fixedly connected, detachably connected, or integrally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0042] The above specific implementation manners do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A resin recycling device, characterized in that, It includes a resin receiving tank, a reactor, a transfer pump, a filter, a heater and a Johnson screen; Among them, the upper part of the resin receiving tank is connected to the bottom end of the reactor. A filter is provided on the discharge pipeline at the top of the resin receiving tank, and an inert gas introduction pipeline is connected to the discharge pipeline between the filter and the resin receiving tank. A heating pipeline connected to the heater is provided at the bottom end of the resin receiving tank; The upper part of the reactor is connected to the transfer pump. An inert gas introduction pipeline is connected to the discharge pipeline at the top of the reactor, and a liquid discharge pipeline equipped with a Johnson screen is also provided at the bottom end of the reactor.
2. The resin recycling device according to claim 1, characterized in that, It includes: A liquid discharge pipeline equipped with a filter is provided at the bottom end of the resin receiving tank, and the liquid discharge pipeline of the resin receiving tank is connected to the pipeline between the reactor and the transfer pump.
3. The resin recycling and reuse device according to claim 2, characterized in that, It includes: Pressure gauges are respectively installed before and after the filter on the liquid discharge pipeline of the resin receiving tank.
4. The resin recycling and reuse device according to claim 2, wherein It includes: A ball valve parallel to the filter is installed on the liquid discharge pipeline of the resin receiving tank, and a drain port is provided on the ball valve.
5. The resin recycling and reuse device according to claim 1, wherein It includes: Pressurizing valves are respectively provided on the inert gas introduction pipelines connected to the top discharge pipelines of the resin receiving tank and the reactor.
6. The resin recycling and reuse device according to claim 1, wherein It includes: Safety valves connected through vent valves are respectively provided at the tops of the resin receiving tank and the reactor.
7. The resin recycling and reuse device according to claim 1, wherein, It includes: Level transmitters are respectively installed on the resin receiving tank and the reactor.
8. The resin recycling and reuse device according to claim 1, wherein, It includes: Pressure gauges are respectively installed on the resin receiving tank and the reactor.
9. The resin recycling and reuse device according to any one of claims 1-8, characterized in that, It includes: On the pipeline connecting the resin receiving tank and the reactor, stop valves are respectively installed at positions close to the resin receiving tank and close to the reactor, and a ball valve is installed between the two stop valves.
10. The resin recycling device according to claim 9, characterized in that, It includes: A drain port is provided on the ball valve installed between the two stop valves.