A production device for alcoholysis recovery of waste polyurethane foam

Abstract

The application discloses a production device for alcoholysis recovery of waste polyurethane foam material, which comprises a raw material system, an alcoholysis reaction system, a neutralization reaction system, a coarse filtration system, a refining system, a fine filtration system and a finished product system; a finished product metering pump is connected to a discharge port of the finished product system; the finished product system is connected with the fine filtration system; the fine filtration system is connected with the refining system; the refining system is connected with the coarse filtration system; the coarse filtration system is connected with the neutralization reaction system; the neutralization reaction system is connected with the alcoholysis reaction system; and the alcoholysis reaction system is connected with the raw material system. The production device for alcoholysis recovery of waste polyurethane foam material has the advantages that the alcoholysis reaction kettle, the neutralization reaction kettle and the vacuum distillation kettle are connected in series, the independence of the functions of each system can be realized, the coordination stability of the system can be ensured, the design is scientific and reasonable, and the production device provides a systematic solution for industrialization conversion of the alcoholysis recovery technology of waste polyurethane foam material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste polyurethane recycling device, in particular to a production device for alcoholysis recycling of waste polyurethane foam material. BACKGROUND

[0002] Waste polyurethane foam is widely used in household appliances, construction, transportation and other industries due to its stable physical properties and thermal insulation performance. A large amount of waste is generated during the production and use of polyurethane foam. At present, the disposal methods are mainly incineration or landfill. The resource recycling of waste polyurethane foam has always been a difficult problem to be solved.

[0003] At present, the recycling technology of waste polyurethane foam mainly includes physical recycling and chemical recycling. The physical recycling method has a simple process, but the value of the recycled products is low, and it is usually only used for downgrading of the original purpose. Although the chemical recycling method has a longer process, the products obtained by chemical recycling can be used as renewable industrial raw materials and enter the social and economic circulation. Therefore, the resource recycling technology of waste polyurethane foam material is an important embodiment of the development of circular economy, and has significant social, environmental and economic benefits.

[0004] In recent years, the chemical recycling of waste polyurethane foam has attracted widespread attention. Many Chinese invention patent applications have disclosed methods for realizing the resource utilization of waste polyurethane foam. In the invention patent with the authorization announcement number CN 110105621 B, a directional degradation method for waste polyurethane material is proposed, and the solution to the problems of low catalytic efficiency, difficulty in selective bond breaking, and difficulty in separating the products after reaction is innovated from the perspective of technical method. In the invention patent with the application publication number CN107286369 A, a method for generating polyols by acidolysis of polyurethane soft foam waste is proposed. This method proposes an acidolysis resource utilization method for high-value utilization of polyurethane soft foam waste. In the invention patent with the application publication number CN112058205 A, a new polyurethane recycling device and method are proposed. This invention solves the negative effects of oxygen on the alcoholysis of polyurethane, such as the increase in side reactions, and improves the quality of polyether polyols obtained by reducing decomposition of recycled polyurethane. The method proposes an acidolysis resource utilization method for high-value utilization of polyurethane soft foam waste.

[0005] There are also innovative developments in equipment for realizing the resource utilization of waste polyurethane foam. For example, the utility model patent with the authorization publication number CN 211069134 U discloses a device for improving the dehydration efficiency of polyether. The utility model patent has a simple structure and convenient operation, greatly shortens the dehydration time of polyether polyol, and has good economic benefits. The utility model patent with the authorization publication number CN 214915867 U discloses a liquid distributor for an alcoholysis device. The scheme of the utility model can reduce the content of ethanol in the crude product.

[0006] From the above analysis, it can be seen that the chemical recycling of waste polyurethane foam has received widespread attention in recent years, but there is a lack of innovative development of complete equipment for the industrialization of resource utilization technology. On the one hand, as mentioned in the text, the device for improving the dehydration efficiency of polyether and the liquid distributor for the alcoholysis device are single devices and accessories that only innovate equipment for specific processes. On the other hand, polyether production is a traditional industry with mature equipment, but the recycling device for waste materials is quite different from the process route of the polyether production industry. The traditional polyether production equipment is not suitable for recycling polyurethane foam. In addition, although the alcoholysis of waste polyurethane foam to recover polyether has become a research hotspot, it is still in the process research stage and needs to be further developed through the development of supporting equipment to realize the technical route of alcoholysis and recovery of polyether. Therefore, it is of great significance to innovate and develop supporting production devices while developing new technologies. SUMMARY

[0007] The purpose of the present application is to provide a production device for alcoholysis and recovery of waste polyurethane foam, which connects the alcoholysis reactor with the neutralization reactor and the vacuum distillation reactor in series, can realize the independence of each system function, and can guarantee the coordination and stability of the system, is scientifically and reasonably designed, and provides a systematic solution for the industrialization of the alcoholysis and recovery technology of waste polyurethane foam.

[0008] To achieve the above-mentioned purpose, the present application provides a production device for alcoholysis and recovery of waste polyurethane foam, which comprises a raw material system, an alcoholysis reaction system, a neutralization reaction system, a coarse filtration system, a refining system, a fine filtration system and a finished product system, the finished product system is connected with a finished product metering pump at the discharge port, the finished product system is connected with the fine filtration system, the fine filtration system is connected with the refining system, the refining system is connected with the coarse filtration system, the coarse filtration system is connected with the neutralization reaction system, the neutralization reaction system is connected with the alcoholysis reaction system, and the alcoholysis reaction system is connected with the raw material system.

[0009] Preferably, the raw material system comprises an elevator, a bin connected with the elevator, a screw feeder connected with the bin, a weighing hopper connected with the screw feeder, and a feeding machine connected with the weighing hopper, wherein the feeding machine is one of a screw feeding machine or a vacuum powder feeding machine.

[0010] Preferably, the alcoholysis reaction system comprises an alcoholysis reactor, an alcoholysis condenser connected with the alcoholysis reactor, and an alcoholysis agent mixing tank arranged below the alcoholysis condenser, wherein the front end of the alcoholysis agent mixing tank is connected with an alcoholysis metering pump, the alcoholysis metering pump is connected with the alcoholysis reactor, the inside upper end of the alcoholysis reactor is provided with a spraying device, and the bottom end of the alcoholysis reactor is connected with an alcoholysis material conveying pump.

[0011] Preferably, the alcoholysis reactor comprises an alcoholysis reactor body, an alcoholysis stirring device arranged in the inside of the alcoholysis reactor body, and an alcoholysis heating control device, wherein the alcoholysis heating control device is arranged at the bottom of both sides of the alcoholysis stirring device, and the side of the alcoholysis reactor body is provided with an alcoholysis temperature control device.

[0012] The upper end surface of the alcoholysis reactor body is provided with an alcoholysis feeding port, an alcoholysis liquid feeding port, an alcoholysis nitrogen port, an alcoholysis steam outlet, an alcoholysis condensate reflux port, an alcoholysis circulating cleaning port, an alcoholysis pressure gauge port, an alcoholysis safety valve port, and an alcoholysis pressure manhole, the bottom end center of the alcoholysis reactor body is provided with an alcoholysis discharging port, and the alcoholysis discharging port is provided with an alcoholysis discharging valve.

[0013] The alcoholysis feeding port is connected with the feeding machine.

[0014] Preferably, the neutralization reaction system comprises a neutralization reactor, a neutralization condenser connected with the neutralization reactor, and a neutralization agent mixing tank arranged below the neutralization condenser, wherein the front end of the neutralization agent mixing tank is connected with a neutralization metering pump, the neutralization metering pump is connected with the neutralization reactor, and the bottom end of the neutralization reactor is connected with a neutralization material conveying pump.

[0015] Preferably, the neutralization reactor comprises a neutralization reactor body, a neutralization stirring device arranged in the inside of the neutralization reactor body, and a neutralization heating device, wherein the neutralization heating device is arranged at the bottom of the neutralization stirring device, the side of the neutralization reactor body is provided with a neutralization temperature control device and a neutralization cooling device.

[0016] The neutralization reactor body is provided with a neutralization feeding port, a neutralization liquid feeding port, a neutralization steam outlet, a neutralization condensate reflux port, a neutralization nitrogen port, a neutralization circulating cleaning port, a neutralization pressure gauge port, a neutralization safety valve port, and a neutralization pressure manhole.

[0017] The bottom center of the neutralization reaction tank is provided with a neutralization discharge port, which is connected with the coarse filtration system through a neutralization material conveying pump.

[0018] The neutralization feed port is connected with the alcoholysis discharge port through an alcoholysis material conveying pump.

[0019] Preferably, the coarse filtration system comprises n-stage filtration equipment, and the n-stage filtration is a combination of one or more of basket filters, bag filters and scraped-wall dry residue discharge filters.

[0020] Preferably, the refining system comprises a vacuum distillation kettle connected with the coarse filtration system, a refining condenser connected with the vacuum distillation kettle, a refining condensate collecting device connected with the refining condenser, and a refining material conveying pump connected with the refining condensate collecting device.

[0021] Preferably, the vacuum distillation kettle comprises a vacuum distillation tank, a vacuum distillation stirring device arranged in the vacuum distillation tank, a nitrogen bubbling device and a vacuum distillation heating device arranged at the bottom of the vacuum distillation stirring device, and a vacuum distillation temperature control device arranged on the side of the vacuum distillation tank.

[0022] The vacuum distillation tank is provided with a vacuum distillation feed port, a vacuum distillation clear liquid port, a vacuum distillation vapor outlet, a vacuum distillation nitrogen port, a vacuum distillation circulating cleaning port, a vacuum distillation pressure gauge port, a vacuum distillation safety valve port and a vacuum distillation pressure manhole.

[0023] The bottom center of the vacuum distillation tank is provided with a vacuum distillation discharge port, which is connected with the vacuum distillation circulating cleaning port, and the vacuum distillation nitrogen port is connected with the nitrogen bubbling device.

[0024] Preferably, the volume of the vacuum distillation kettle is at least 1.5 times the volume of the alcoholysis reaction kettle.

[0025] Preferably, the vacuum distillation discharge port is connected with the fine filtration system through the refining material conveying pump, and the filtration accuracy of the fine filtration system ranges from 1 to 10 microns.

[0026] Therefore, the production device for alcoholysis recovery of waste polyurethane foam material has the following beneficial effects:

[0027] (1) The alcoholysis reaction kettle, the neutralization reaction kettle and the vacuum distillation kettle are connected in series, which can realize the independence of the functions of each system and guarantee the coordination and stability of the system.

[0028] (2) According to the characteristics of the alcoholysis recovery product of waste polyurethane foam material, an external circulation pipeline is designed in the alcoholysis reaction kettle, the neutralization reaction kettle and the vacuum distillation kettle, so that the equipment and the pipeline can be cleaned and washed, pipeline blockage is avoided, and the applicability of the complete equipment is improved;

[0029] (3) According to the characteristics of the alcoholysis recovery product of waste polyurethane foam material, a high-temperature-resistant filtering equipment is used in the fine filtering system, so that the problems of large material viscosity, poor fluidity and difficult filtering are effectively solved;

[0030] (4) By adjusting the parameters of the monomer equipment, different alcoholysis recovery processes can be matched, and the industrialization conversion of new technologies is promoted.

[0031] The technical solutions of the present application will be further described in detail below through the drawings and examples. DRAWINGS

[0032] Figure 1 It is a flow chart of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application;

[0033] Figure 2 It is a structure schematic diagram of an alcoholysis reaction kettle of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application;

[0034] Figure 3 It is a top view of an alcoholysis reaction kettle of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application;

[0035] Figure 4 It is a structure schematic diagram of a neutralization reaction kettle of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application;

[0036] Figure 5 It is a top view of a neutralization reaction kettle of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application;

[0037] Figure 6 It is a structure schematic diagram of a vacuum distillation kettle of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application;

[0038] Figure 7 It is a top view of a vacuum distillation kettle of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be further described in detail below through the drawings and examples.

[0040] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the ordinary meanings as understood by one of ordinary skill in the art to which this application pertains. The terms "first", "second", and similar terms are used herein to distinguish one element from another, and are not necessarily used in a sequence or to denote importance or quantity. The terms "comprise", "comprising", "include", "including" and the like are used herein to mean including but not limited to. The terms "connected", "coupled", and the like are used herein to mean either a direct connection or an indirect connection through one or more intervening elements or intervening media unless otherwise indicated.

[0041] Figure 1 As shown in the flow chart of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application, the present application provides a production device for alcoholysis recovery of waste polyurethane foam material, which comprises a raw material system 1, an alcoholysis reaction system 2, a neutralization reaction system 3, a coarse filtration system 4, a refining system 5, a fine filtration system 6, and a finished product system 7. The finished product system 7 is connected with a finished product metering pump 8 at the discharge port. The finished product system 7 is connected with the fine filtration system 6. The fine filtration system 6 is connected with the refining system 5. The refining system 5 is connected with the coarse filtration system 4. The coarse filtration system 4 is connected with the neutralization reaction system 3. The neutralization reaction system 3 is connected with the alcoholysis reaction system 2. The alcoholysis reaction system 2 is connected with the raw material system 1.

[0042] The raw material system 1 comprises an elevator 11, a stock bin 12 connected with the elevator 11, a screw feeder 13 connected with the stock bin 12, a weighing hopper 14 connected with the screw feeder 13, and a feeding machine 15 connected with the weighing hopper 14. The feeding machine 15 is one of a screw feeding machine or a vacuum powder feeding machine, but is not limited to the above forms. The feeding machine performs material conveying under nitrogen protection conditions. The feeding machine is connected with the alcoholysis feeding port of the alcoholysis reaction kettle to realize closed batch automatic feeding.

[0043] Figure 2 As shown in the structural schematic diagram of the alcoholysis reaction kettle of an embodiment of the production device for alcoholysis recovery of waste polyurethane foam material of the present application, Figure 3As shown in the figure, the alcoholysis reaction system 2 comprises an alcoholysis reaction kettle 21, an alcoholysis condenser 22 connected with the alcoholysis reaction kettle 21 and an alcoholysis agent mixing tank 23 arranged below the alcoholysis condenser 22, the front end of the alcoholysis agent mixing tank 23 is connected with an alcoholysis metering pump 24, the alcoholysis metering pump 24 is connected with the alcoholysis reaction kettle 21, a spraying device 25 is arranged at the inner upper end of the alcoholysis reaction kettle 21, and an alcoholysis material conveying pump 26 is connected with the bottom end of the alcoholysis reaction kettle 21. The alcoholysis reaction kettle 21 comprises an alcoholysis reaction kettle body 211, an alcoholysis stirring device 212 arranged in the alcoholysis reaction kettle body 211 and an alcoholysis heating control device 213, the alcoholysis heating control device 213 is arranged at the bottom of both sides of the alcoholysis stirring device 212, and an alcoholysis temperature control device 214 is arranged on the side of the alcoholysis reaction kettle body 211; an alcoholysis feeding port 215, an alcoholysis liquid feeding port 216, an alcoholysis nitrogen port 217, an alcoholysis steam outlet 218, an alcoholysis condensate reflux port 219, an alcoholysis circulating cleaning port 210, an alcoholysis pressure gauge port 220, an alcoholysis safety valve port 221 and an alcoholysis pressure manhole 222 are arranged on the upper end surface of the alcoholysis reaction kettle body 211, an alcoholysis discharging port 223 is arranged at the center of the bottom end of the alcoholysis reaction kettle body 211, an alcoholysis discharging valve 224 is arranged on the alcoholysis discharging port 223, and the alcoholysis feeding port 215 is connected with the feeding machine 15. The working temperature of the alcoholysis reaction kettle is 150-190 DEG C. The heating form of the alcoholysis reaction kettle is one of jacket heating and coil heating, the heating medium is one of steam and heat conducting oil, the alcoholysis discharging port is connected with the neutralization feeding port through the alcoholysis material conveying pump and connected with the alcoholysis circulating cleaning port through the setting loop, and the monomer equipment can realize self-circulating cleaning. The alcoholysis temperature control device of the alcoholysis reaction kettle comprises a temperature sensor, a temperature display and a temperature controller, wherein, two or more temperature sensors can be arranged at positions such as the kettle wall, the kettle bottom and the kettle top, and the arrangement of the temperature sensor is not limited to the above positions.

[0044] Figure 4 A neutralization reaction kettle structure schematic view of the production device embodiment for waste polyurethane foam alcoholysis recovery of the present application, Figure 5As shown in the figure, the neutralization reaction system 3 comprises a neutralization reaction kettle 30, a neutralization condenser 31 connected with the neutralization reaction kettle 30, and a neutralization agent mixing tank 32 arranged below the neutralization condenser 31, the front end of the neutralization agent mixing tank 32 is connected with a neutralization metering pump 33, the neutralization metering pump 33 is connected with the neutralization reaction kettle 30, and the bottom end of the neutralization reaction kettle 30 is connected with a neutralization material conveying pump 34. The neutralization reaction kettle 30 comprises a neutralization reaction kettle body 300, a neutralization stirring device 301 arranged inside the neutralization reaction kettle body 300, and a neutralization heating device 302 arranged at the bottom of the neutralization stirring device 301, a neutralization temperature control device 303 and a neutralization cooling device 304 are arranged on the side surface of the neutralization reaction kettle body 300; the neutralization reaction kettle body 300 is provided with a neutralization feeding port 305, a neutralization liquid adding port 306, a neutralization steam outlet 307, a neutralization condensate backflow port 308, a neutralization nitrogen port 309, a neutralization circulating cleaning port 310, a neutralization pressure gauge port 311, a neutralization safety valve port 312, and a neutralization pressure manhole 313; the bottom center of the neutralization reaction kettle body 300 is provided with a neutralization discharge port 314, the neutralization discharge port 314 is connected with the coarse filtration system 4 through the neutralization material conveying pump 34; and the neutralization feeding port 305 is connected with the alcoholysis material conveying pump 26 and the alcoholysis discharge port 223. The working temperature range of the neutralization reaction kettle is 25-110 DEG C, the heating mode is one of jacket heating and coil heating, the heating medium is one of steam and heat-conducting oil, and the neutralization cooling device adopts a coil cooling form. The neutralization discharge port is connected with the feeding port of the first-stage filter of the coarse filtration system through the neutralization material conveying pump, and is connected with the neutralization circulating cleaning port through a set loop, so that the single equipment can be self-circulating cleaned. The neutralization temperature control device comprises a temperature sensor, a temperature display and a temperature controller, two or more temperature sensors can be arranged at positions such as the kettle wall, the kettle bottom and the kettle top, and the arrangement of the temperature sensor is not limited to the above positions.

[0045] The coarse filtration system 4 comprises n-stage filtration equipment, and the n-stage filtration is arranged in the form of one or a combination of a basket filter, a bag filter and a scraped-wall dry residue filter. The working temperature of the n-stage filtration equipment is 80-100 DEG C, the number and precision of the filtration equipment can be set according to the impurity content and the impurity particle size distribution, and the final filtration precision should be higher than 0.2 mm. The n-stage filtration equipment is two-stage filtration, wherein the filtration precision of the first-stage filter ranges from 0.5 mm to 2 mm, and the filtration precision of the second-stage filtration equipment ranges from 0.1 mm to 0.5 mm.

[0046] Figure 6 A structure schematic view of a reduced-pressure distillation kettle for the production device embodiment for alcoholysis recovery of waste polyurethane foam, Figure 7As shown in the top view of the vacuum distillation kettle of the production device for alcoholysis recovery of waste polyurethane foam material, the refining system 5 comprises a vacuum distillation kettle 50 connected with the coarse filtration system 4, a refining condenser 51 connected with the vacuum distillation kettle 50, a refining condensate collecting device 52 connected with the refining condenser 51, and a refined material conveying pump 53 connected with the refining condensate collecting device 52. The vacuum distillation kettle 50 comprises a vacuum distillation kettle body 500, a vacuum distillation stirring device 501 arranged in the vacuum distillation kettle body 500, a nitrogen bubbling device 502, and vacuum distillation heating devices 503 arranged at the bottom of the vacuum distillation stirring device 501 on both sides. The side of the vacuum distillation kettle body 500 is provided with a vacuum distillation temperature control device 504. The vacuum distillation kettle body 500 is provided with a vacuum distillation feeding port 505, a vacuum distillation clear liquid port 506, a vacuum distillation vapor outlet 507, a vacuum distillation nitrogen port 508, a vacuum distillation circulating cleaning port 509, a vacuum distillation pressure gauge port 510, a vacuum distillation safety valve port 511, and a vacuum distillation pressure manhole 512. The bottom center of the vacuum distillation kettle body 500 is provided with a vacuum distillation discharge port 513, which is connected with the vacuum distillation circulating cleaning port 509. The vacuum distillation nitrogen port 508 is connected with the nitrogen bubbling device 502. The volume of the vacuum distillation kettle 50 is at least 1.5 times the volume of the alcoholysis reaction kettle 21. The vacuum distillation discharge port 513 is connected with the fine filtration system 6 through the refined material conveying pump 53. The filtration accuracy of the fine filtration system 6 ranges from 1 to 10 μm. The working temperature of the vacuum distillation kettle is 25-115°C. The vacuum distillation product is conveyed to the fine filtration equipment through the vacuum distillation material conveying pump, and the vacuum distillation discharge port is connected with the vacuum distillation circulating cleaning port through a set circuit, so that the single equipment can be self-circulating cleaned. The heating form of the vacuum distillation kettle is one of jacket heating and coil heating, and the heating medium is one of steam and heat-conducting oil. The vacuum distillation temperature control device of the vacuum distillation kettle comprises a temperature sensor, a temperature display, and a temperature controller. Two or more temperature sensors can be arranged at positions such as the kettle wall, the kettle bottom, and the kettle top. The arrangement of the temperature sensors is not limited to the above positions. The nitrogen bubbling device is connected with the vacuum distillation nitrogen port and is a concentric circular pipe with small holes at the end of the bottom part of the vacuum distillation kettle wall, and the whole is made of stainless steel.

[0047] The working temperature of the fine filtration system is 25-120°C, and the filtration accuracy ranges from 1 to 10 μm. The fine filtration system mainly comprises a fine filtration equipment. The discharge port of the fine filtration equipment is connected with the feeding port of the finished product storage tank, and is connected with the vacuum distillation circulating cleaning port of the vacuum distillation kettle through a set circuit, so that the fine filtration equipment can be circulating cleaned. The fine filtration equipment is a candle filter.

[0048] Working process: waste polyurethane foam material enters the silo through the material lifting machine, and is sent into the weighing hopper by the screw feeder. After the raw material is weighed by the weighing hopper, it is fed into the alcoholysis reaction kettle through the alcoholysis feed port of the alcoholysis kettle by the feeding machine. The alcoholysis agent pre-mixed in the alcoholysis agent mixing tank is fed into the alcoholysis reaction kettle through the alcoholysis liquid adding port by the alcoholysis metering pump, and is uniformly distributed through the alcoholysis spraying device. The alcoholysis agent and the raw material are subjected to alcoholysis reaction under certain conditions. After the alcoholysis reaction is completed, the alcoholysis product is sealed and transported to the neutralization reaction kettle by the alcoholysis material conveying pump through the alcoholysis discharge port, and enters the neutralization process. The neutralizing agent is pre-mixed in the neutralizing agent mixing tank, and is fed into the neutralization reaction kettle through the neutralization liquid adding port by the neutralization metering pump, and the neutralization reaction is started. After the neutralization reaction is completed, the product is sealed and transported to the first filter of the coarse filtration system through the neutralization material conveying pump through the neutralization discharge port, and is subjected to primary filtration. After the product is filtered through n-stage filtration equipment, it is sealed and transported to the vacuum distillation kettle through the n-stage filtration equipment discharge port, and enters the refining process. The vacuum distillation process of the refining process is carried out in the vacuum distillation kettle, and after the refining is completed, the product is sealed and transported to the precision filtration equipment through the refining material conveying pump through the refining discharge port, and enters the precision filtration process. The precision filtration process is carried out in the precision filtration equipment, and after the precision filtration is completed, the product is sealed and transported to the finished product storage tank through the discharge port, and enters the finished product system. The obtained finished product is connected to the filling equipment according to the needs of the later processing.

[0049] Example

[0050] The certain refrigerator insulation layer foam enters the bin through the material lifting machine, and is sent into the weighing hopper by the screw feeder. After weighing 20 kg of raw material, the weighing hopper is automatically fed by the feeding machine. The diethylene glycol, 1, 4 butanediol, potassium hydroxide and other alcoholysis agents are premixed in the alcoholysis agent mixing tank in advance, and are uniformly sprayed in the alcoholysis reaction kettle through the alcoholysis metering pump and the alcoholysis spraying device according to a certain stoichiometric ratio through the alcoholysis liquid adding port and the alcoholysis spraying device. The alcoholysis reaction kettle continuously stirs and heats the material under the condition of nitrogen protection, and the alcoholysis reaction occurs when the material temperature reaches 165 DEG C. After the alcoholysis reaction is completed, the alcoholysis product is conveyed to the neutralization reaction kettle by the alcoholysis material conveying pump through the alcoholysis discharge port, and the temperature is reduced to 80 DEG C. The neutralization process is entered. The neutralizing agent sulfuric acid placed in the neutralizing agent mixing tank in advance is added into the neutralization reaction kettle by the neutralizing metering pump through the neutralizing liquid adding port, and the neutralization reaction is started. The neutralization reaction process is fully stirred to ensure uniform reaction of the material in the kettle. After the neutralization reaction is completed, the product is conveyed to the secondary coarse filtration system by the neutralization material conveying pump through the neutralization discharge port, the first stage filter is a basket filter with a filtering accuracy of 1.5 mm, and the second stage filter is a wall scraping type dry residue filter with a filtering accuracy range of 0.2 mm. After being filtered by the coarse filtration system, the product is conveyed to the vacuum distillation kettle through the discharge port, and enters the refining process. The vacuum distillation process of the refining process is carried out in the vacuum distillation kettle. Under the nitrogen atmosphere, the water and volatile substances in the product are removed by nitrogen bubbling and vacuum distillation. After refining, the product is conveyed to the precision filtration equipment by the refining material conveying pump through the refining discharge port, and enters the precision filtration process.

[0051] The precision filtration process is carried out in a candle filter, and the filtering accuracy can reach 1-10 mu m. After precision filtration is completed, the product is conveyed to the finished product storage tank through the discharge port, and enters the finished product system. The obtained finished product is connected to the filling equipment according to the needs of the later processing.

[0052] The alcoholysis reaction kettle, the neutralization reaction kettle and the vacuum distillation kettle are connected in series, which can realize the independence of the functions of each system and guarantee the coordination and stability of the system. By adjusting the parameters of the single equipment, different alcoholysis recovery processes can be matched, and the industrialization of new technologies is promoted.

[0053] Therefore, the production device for alcoholysis recovery of waste polyurethane foam material adopts the above structure, the alcoholysis reaction kettle, the neutralization reaction kettle and the vacuum distillation kettle are connected in series, which can realize the independence of the functions of each system and guarantee the coordination and stability of the system, the design is scientific and reasonable, and a systematic solution is provided for the industrialization of the alcoholysis recovery technology of waste polyurethane foam material.

[0054] It should be pointed out finally that the above examples are only used to illustrate the technical solutions of the present application but not to limit it, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can still be modified or replaced equivalently, and these modifications or equivalent replacements should not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A production apparatus for the alcoholysis and recycling of waste polyurethane foam materials, characterized in that: It includes a raw material system, an alcoholysis reaction system, a neutralization reaction system, a coarse filtration system, a refining system, a fine filtration system, and a finished product system. The outlet of the finished product system is connected to a finished product metering pump. The finished product system is connected to the fine filtration system, the fine filtration system is connected to the refining system, the refining system is connected to the coarse filtration system, the coarse filtration system is connected to the neutralization reaction system, the neutralization reaction system is connected to the alcoholysis reaction system, and the alcoholysis reaction system is connected to the raw material system. The raw material system includes an elevator, a hopper connected to the elevator, a screw feeder connected to the hopper, a weighing hopper connected to the screw feeder, and a loading machine connected to the weighing hopper. The loading machine is either a screw feeder or a vacuum powder feeder. The neutralization reaction system includes a neutralization reaction vessel, a neutralization condenser connected to the neutralization reaction vessel, and a neutralizing agent mixing tank disposed below the neutralization condenser. A neutralization metering pump is connected to the front end of the neutralizing agent mixing tank and is connected to the neutralization reaction vessel. A neutralization material conveying pump is connected to the bottom end of the neutralization reaction vessel. The alcoholysis reaction system includes an alcoholysis reactor, an alcoholysis condenser connected to the alcoholysis reactor, and an alcoholysis agent mixing tank located below the alcoholysis condenser. An alcoholysis metering pump is connected to the front end of the alcoholysis agent mixing tank and is connected to the alcoholysis reactor. A spray device is provided at the upper end of the interior of the alcoholysis reactor, and an alcoholysis material conveying pump is connected to the bottom end of the alcoholysis reactor. The coarse filtration system includes n-stage filtration equipment, wherein the n-stage filtration is configured as one or a combination of basket filters, bag filters, and scraped wall-mounted sludge discharge filters; The refining system includes a vacuum distillation kettle connected to the coarse filtration system, a refining condenser connected to the vacuum distillation kettle, a refining condensate collection device connected to the refining condenser, and a refining material delivery pump connected to the refining condensate collection device.

2. The production apparatus for alcoholysis recycling of waste polyurethane foam materials according to claim 1, characterized in that: The alcoholysis reactor includes an alcoholysis reaction vessel, an alcoholysis stirring device and an alcoholysis heating control device disposed inside the alcoholysis reaction vessel, the alcoholysis heating control device being disposed on both sides of the bottom of the alcoholysis stirring device, and an alcoholysis temperature control device being disposed on the side of the alcoholysis reaction vessel; the upper end face of the alcoholysis reaction vessel is provided with an alcoholysis feed inlet, an alcoholysis liquid inlet, an alcoholysis nitrogen inlet, an alcoholysis steam outlet, an alcoholysis condensate reflux inlet, an alcoholysis circulation cleaning inlet, an alcoholysis pressure gauge inlet, an alcoholysis safety valve inlet and an alcoholysis pressure manhole, and an alcoholysis discharge outlet is disposed at the center of the bottom end of the alcoholysis reaction vessel, and an alcoholysis discharge valve is disposed on the alcoholysis discharge outlet.

3. The production apparatus for alcoholysis recycling of waste polyurethane foam materials according to claim 1, characterized in that: The neutralization reactor includes a neutralization reaction vessel, a neutralization stirring device and a neutralization heating device disposed inside the neutralization reaction vessel, the neutralization heating device being disposed at the bottom of the neutralization stirring device, and a neutralization temperature control device and a neutralization cooling device being disposed on the side of the neutralization reaction vessel; the neutralization reaction vessel is provided with a neutralization inlet, a neutralization liquid inlet, a neutralization steam outlet, a neutralization condensate return outlet, a neutralization nitrogen outlet, a neutralization circulation cleaning outlet, a neutralization pressure gauge outlet, a neutralization safety valve outlet and a neutralization pressure manhole. The neutralization reaction tank is provided with a neutralization outlet at the bottom center, and the neutralization outlet is connected to the coarse filtration system through a neutralization material conveying pump. The neutralization inlet is connected to the alcoholysis outlet via an alcoholysis material conveying pump.

4. A production apparatus for the alcoholysis and recycling of waste polyurethane foam materials according to claim 1, characterized in that: The vacuum distillation kettle includes a vacuum distillation tank body, a vacuum distillation stirring device, a nitrogen bubbling device and a vacuum distillation heating device disposed inside the vacuum distillation tank body, the vacuum distillation heating device being disposed on both sides of the bottom of the vacuum distillation stirring device, and a vacuum distillation temperature control device being disposed on the side of the vacuum distillation tank body. The vacuum distillation tank is equipped with a vacuum distillation feed inlet, a vacuum distillation clear liquid inlet, a vacuum distillation steam outlet, a vacuum distillation nitrogen inlet, a vacuum distillation circulation cleaning inlet, a vacuum distillation pressure gauge inlet, a vacuum distillation safety valve inlet, and a vacuum distillation pressure manhole. The vacuum distillation tank has a vacuum distillation outlet at the bottom center, which is connected to the vacuum distillation circulation cleaning port, and the vacuum distillation nitrogen port is connected to the nitrogen bubbling device.

5. A production apparatus for the alcoholysis and recycling of waste polyurethane foam materials according to claim 4, characterized in that: The volume of the vacuum distillation vessel is at least 1.5 times that of the alcoholysis reactor; the vacuum distillation outlet is connected to the fine filtration system via the refined material delivery pump, and the filtration accuracy of the fine filtration system is in the range of 1-10 μm.

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