CN218689294U - Equipment for preparing polyethylene wax by continuously cracking waste polyethylene - Google Patents
Equipment for preparing polyethylene wax by continuously cracking waste polyethylene Download PDFInfo
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- CN218689294U CN218689294U CN202222641118.5U CN202222641118U CN218689294U CN 218689294 U CN218689294 U CN 218689294U CN 202222641118 U CN202222641118 U CN 202222641118U CN 218689294 U CN218689294 U CN 218689294U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The utility model provides an equipment of polyethylene wax is made in continuous schizolysis of waste polyethylene, according to the direction of processing of waste polyethylene, equipment includes raw materials preprocessing device (1), continuous pyrolysis reactor (2), separator (3) and refining jar (4) of material intercommunication in proper order. Adopt the utility model discloses the method of preparing low molecular weight polyethylene by the continuous schizolysis of the waste polyethylene of well equipment cambium is unique, and its flow is simple and serialization: the three steps of continuous cracking and product separation and refining are adopted, so that the complex operation processes of repeated heating and cooling, feeding and discharging and the like in the intermittent production process are avoided, the automation degree is high, the process is safe and reliable, the product property is stable, the time and the labor are saved, and the energy is saved and the environment is protected.
Description
Technical Field
The utility model relates to a polymer processing field especially relates to an equipment of polyethylene wax is made in useless polyethylene serialization schizolysis.
Background
The polyethylene wax is low-molar-mass polyethylene with the number-average molecular weight of 1000-5000, the melting point is higher than 90 ℃, and the relative density is 0.91-0.96 g/cm 3 And the color is mostly white or yellowish. Because of its high melting point, low melt viscosity, excellent wear resistance, thermal stability and lubricity, it can be used as lubricant and dispersant in various fields. The polyethylene wax product is of a polymerization type and a cracking type, and the performance and the application of the polyethylene wax product mainly depend on the molar mass, the molecular weight distribution, the molecular structure and the like. The performance indexes of the method are not uniformly specified so far, and only corresponding indexes are selected according to different purposes. At present, most of high-performance polyethylene wax products used in China are imported from foreign countries.
The polyethylene wax product with controllable molar mass and narrow distribution can be obtained by polymerizing ethylene monomer, but the method has large processing equipment and high production cost. The cracking production process is that the raw material is subjected to high-temperature thermal cracking or catalytic cracking at the temperature of more than 300 ℃ under an anaerobic condition to generate a polyethylene wax product, and the property of the produced polyethylene wax is greatly influenced by the source of the cracking raw material. The polyethylene wax produced by using the polyethylene waste plastics has rich and cheap raw material sources, but the product quality is not well controlled. Because the plastic has poor thermal conductivity and high viscosity during heating, a melt which is easy to convey is difficult to form; secondly, the waste plastics can generate carbon deposition during pyrolysis, which not only affects the wax yield, but also adheres to equipment and pipelines to cause blockage, and is difficult to clean.
Patent CN201810569475.0 discloses a method for producing polyethylene wax from waste polyethylene: classifying waste polyethylene, cleaning, drying, pretreating, and feeding into a cracking device, adding an AL-MCM-48 catalyst accounting for 0.1% of the weight of the waste polyethylene, and heating while stirring; after the reaction is finished, the wax product is filtered and granulated, and the gas-liquid phase product enters a condensing system for cooling and recovery. The practical production of the process has the following problems: the waste polyethylene sorting, cleaning and drying processes are time-consuming and labor-consuming, and a large amount of water and energy are consumed; the added AL-MCM-48 solid acid catalyst not only can abrade stirring equipment at high temperature, but also can accelerate the coking and carbon deposition process of polyethylene, cause serious equipment coking and reduce the wax yield; after the reaction is finished, the wax product filtering process is faced with the problems of high-viscosity wax product and catalyst powder and difficult separation.
CN201210132597.6 discloses a method for preparing segment phenoxy group-containing polyethylene wax by thermal degradation, which comprises the following steps of: 100, uniformly mixing hydroquinone and polyethylene granules, adding the mixture into a high-pressure stirring reaction kettle, introducing nitrogen, reacting for 0.5 to 5 hours at 330 to 380 ℃, taking out wax blocks after the reaction is finished, and crushing to obtain a product. The polyethylene used by the method is fresh polyethylene granules, so the cost is higher; hydroquinone is also high in price, and aromatic hydrocarbon groups are introduced into a system, so that the color and the stability of a product are influenced; the reaction time is long, the polyethylene can generate coke-forming and carbon-depositing processes at the high temperature of 330-380 ℃, equipment coking is serious, and the yield of the polyethylene wax can be reduced.
CN201510665356.1 discloses a method for producing polyethylene wax from waste polyethylene: firstly, cleaning waste polyethylene, then putting the waste polyethylene into a cracking furnace, adding a petroleum ether solution, and dissolving for 2-3 h at room temperature; then introducing steam into the furnace, and continuously cracking for 1-2 h; adding 2, 6-tetramethyl-N-piperidine oxide into the cracked solution, continuously stirring, and reacting for 30-50 min; cooling the cracked solution to room temperature, and discharging; and detecting the quality of the product after crushing. The practical production of the process has the following problems: the waste polyethylene cleaning process is time-consuming and labor-consuming, and consumes a large amount of water; adding petroleum ether solution to dissolve for 2-3 h at room temperature, which wastes time and labor and consumes a large amount of petroleum ether; introducing steam into the furnace, continuously cracking for 1-2 h, adding 2, 6-tetramethyl-N-piperidine oxide into the solution after cracking, and continuously stirring to react for 30-50 min, which is a time-consuming and labor-consuming process; and subsequent cooling, discharging and crushing processes are adopted, so that the whole process is too complex, the energy consumption and material consumption are high, and the technical economy is difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art's shortcoming, the utility model aims to provide an equipment of polyethylene wax is cracked in succession to useless polyethylene for solve among the prior art easy coking, the wax yield is low, the product quality is poor, can not serialization production, the safe risk is big, intensity of labour is big, the problem that the energy consumption thing consumes highly, but provide a serialization operation from this, the safety and stability energy consumption is low, the wax yield is high, the product quality is good and be difficult for the equipment of production polyethylene wax of carbon deposition.
To achieve the above objects and other related objects, the present invention includes the following technical solutions.
The utility model provides an equipment of polyethylene wax is made in continuous schizolysis of waste polyethylene, according to the direction of processing of waste polyethylene, equipment includes raw materials preprocessing device, continuous schizolysis reactor, separator and the refining jar of material intercommunication in proper order.
In a preferred embodiment, a polyethylene wax granulator is communicated with the downstream of the refining tank.
In a preferred embodiment, the polyethylene wax granulator is a spray dryer or a mill.
In a preferred embodiment, the continuous cracking reactor is selected from one or more of a tubular reactor, a tank reactor, a fixed bed reactor, a slurry bed reactor.
In one embodiment, the separator is selected from one or more of a melt filter, a centrifugal separator, a hydrocyclone, and a fractionation column.
In a preferred embodiment, the filter is a melt filter.
In a preferred embodiment, the filter has a filtration precision of 0.01 to 100 μm.
In a preferred embodiment, the separator is provided with a gas-phase product discharge channel.
In a preferred embodiment, the gas-phase product discharge channel is connected to a gas recovery tank.
In a preferred embodiment, the refining tank comprises one or more of a hydrofinishing tank, an oxygen-adding refining tank, and a purification refining tank.
In a preferred embodiment, the refining tank is provided with an auxiliary addition port.
As above, the utility model discloses an equipment of polyethylene wax is made in pyrolysis of useless polyethylene serialization has following beneficial effect:
1. adopt the utility model discloses the method of preparing low molecular weight polyethylene by the continuous schizolysis of waste polyethylene that well equipment formed is unique, and its flow is simple and serialization: the three steps of continuous cracking and product separation and refining are adopted, so that the complex operation processes of repeated heating and cooling, feeding and discharging and the like in the intermittent production process are avoided, the automation degree is high, the process is safe and reliable, the product property is stable, the time and the labor are saved, and the energy is saved and the environment is protected.
2. The available product solution is flexible: the method can adjust the operation conditions such as the types of the auxiliary agents, the reaction temperature, the reaction duration and the like according to the target product to obtain polyethylene wax and other products with different molecular structures and molecular weight distributions, and has strong market adaptability.
The equipment provided by the technical scheme of the application can obtain the polyethylene wax, the micro-powder polyethylene wax and the oxidized polyethylene wax with the number average molecular weights of 1000-2000, 2000-3000, 3000-4000 and 4000-5000 with low cost and high yield.
Drawings
FIG. 1 shows a schematic structural diagram of an apparatus for preparing polyethylene wax by continuous pyrolysis of waste polyethylene according to the present invention.
The reference numerals in FIG. 1 are explained as follows
1. Raw material pretreatment device
2. Continuous cracking reactor
3. Separator
4. Refining tank
5. Polyethylene wax granulator
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
As shown in figure 1, the utility model provides a concrete polyethylene wax's of waste polyethylene serialization schizolysis equipment according to the direction of processing of waste polyethylene, equipment includes material intercommunication's raw materials preprocessing device 1, continuous pyrolysis reactor 2, separator 3 and refining tank 4 in proper order.
In a specific embodiment, the raw material pretreatment apparatus 1 is one or more of an automatic waste plastic sorting machine, a pulverizing apparatus, a cleaning apparatus, a filtering apparatus, and a granulating apparatus. When the number of the devices is multiple, the devices are communicated with each other. The automatic waste plastic sorting machine is used for sorting different types of plastics, such as waste plastic products made of different materials, such as polyethylene, polypropylene, polyvinyl chloride, polystyrene and the like, by utilizing density difference; the cleaning device is used for removing impurities such as oil stains, labels, animal and plant residues, silt, humus and the like attached to waste plastics by adopting a solvent cleaning method or a solvent-free cleaning method. In a more specific embodiment, the raw material pretreatment device is a crushing device and a cleaning device which are sequentially communicated with each other.
In a preferred embodiment as shown in fig. 1, a polyethylene wax pelletizer 5 is also connected to the downstream of the refining tank 4.
In a more specific embodiment, the polyethylene wax pelletizer 5 is a spray dryer or a mill. When the spray dryer is adopted, the solution of the polyethylene wax is treated by the spray dryer, the polyethylene wax serving as a heavy component is separated out and collected after passing through the spray dryer, and light components such as solvent or fine impurity powder and the like are taken away in gas along with atomization. The pulverizer is used for grinding the polyethylene wax into fine powder, and the fine powder polyethylene wax has more use value and commercial value.
In a preferred embodiment as shown in fig. 1, the continuous pyrolysis reactor 2 is selected from one or more of a tubular reactor, a tank reactor, a fixed bed reactor, and a slurry bed reactor. In a more preferred embodiment, the continuous cracking reactor 2 is a tubular reactor. When a tubular reactor is selected for continuous cracking reaction, the waste polyethylene is uniformly distributed without back mixing, the heating is uniform, the energy utilization rate is high, and the continuous production is easy.
In a preferred embodiment, the separator 3 is selected from one or more of a melt filter, a centrifugal separator, a hydrocyclone and a fractionation column. In a more preferred embodiment, the melt filter has a filter fineness of 0.01 to 100. Mu.m, preferably 0.1 to 50 μm. In one particular embodiment as shown in fig. 1, the separation is performed with a melt filter with a 10 micron filtration accuracy.
In a preferred embodiment as shown in fig. 1, the separator 3 is provided with a gas phase product discharge channel.
In a preferred embodiment as shown in fig. 1, the gas-phase product discharge channel is connected to a gas recovery tank.
In a specific embodiment, the refining tank comprises one or more of a hydrofinishing tank, an oxygen-adding refining tank and a purification refining tank. In a more specific embodiment, the refining tank comprises a hydrofinishing tank and a purification refining tank which are connected in series.
In a preferred embodiment as shown in fig. 1, the refining vessel 4 is provided with an auxiliary feed opening.
The polyethylene wax is produced by adopting the above embodiment, the waste polyethylene raw material is continuously cracked at 300-500 ℃ to obtain a gas-phase product and a non-gas-phase product, and the non-gas-phase product is separated and refined to obtain the polyethylene wax. The waste polyethylene raw material is waste. The details are as follows.
In one embodiment, a method for preparing polyethylene wax by continuous pyrolysis of waste polyethylene in a specific device is provided, which adopts the following devices: the raw material pretreatment device 1 comprises a crushing device and a cleaning device which are sequentially communicated with each other, wherein the crushing device is used for extruding and granulating, the crushing device is a screw extrusion granulator, the cleaning device is a water washing device, and impurities such as soil, straws, weeds and the like are removed through cleaning; then the polyethylene wax is cracked in a tubular cracking reactor 2, filtered by a melt filter 3 and then enters a refining process, a refining tank 4 comprises a hydrofining tank and a purification tank which are communicated with each other in sequence, hydrogen is added in the hydrofining tank for refining, and then the polyethylene wax is obtained by purification in a purification tank; and finally, grinding and granulating in a polyethylene wax granulator 5 to obtain a powdery polyethylene wax product. The device is easy to realize continuous large-scale production and control each process. The specific steps and process are as follows.
Waste polyethylene purchased in the market is crushed and cleaned by a raw material pretreatment device 1, and then enters a continuous cracking reactor 2, inert gas nitrogen is provided for providing a protective gas environment during cracking, powdery ultra-large pore alumina is used as a cracking catalyst, the continuous cracking reactor 2 is a tubular reactor, the waste polyethylene is subjected to initial cracking at 350 ℃ for 30min and then enters a melt filter for filtration, the filtration precision is 10 microns, and a gas-phase product is separated from a non-gas-phase product in the melt filter 3 and then enters a gas recovery tank; the non-gas phase product enters a refining tank 4, is firstly mixed with auxiliary agent hydrogen in a crude wax fixed bed hydrogenation refining tank according to the volume ratio of 300 to 1 and is treated at 300 ℃ for 60min, and the obtained hydrogenated polyethylene wax enters a purification refining tank when being hot and is mixed with paraxylene according to the mass ratio of 1; 1, then adopting ethanol as a precipitator to precipitate polyethylene wax at 75 ℃ and 1MPa, and feeding the precipitated polyethylene wax into a polyethylene wax granulator to carry out drying and grinding to obtain the refined polyethylene wax.
In the embodiment, the waste polyethylene purchased in the market is the waste mulching film with the LLDPE content of more than 90 wt%.
The obtained polyethylene wax has snow white appearance and no peculiar smell, the number average molecular weight is 4920, the melting point is 121.80 ℃, and the molecular weight distribution index is 2.69.
Comparative example 1
The difference from the example 1 is that the purchased waste polyethylene powder in the present example contains LLDPE, PET and PVC, and the mass ratio of LLDPE, PET and PVC is 1: (0.8-1.2): (0.8-1.2). The rest is the same as in example 1.
The physical and chemical properties of the obtained polyethylene wax are as follows: the obtained polyethylene wax has yellow brown appearance, pungent smell, number average molecular weight of 4710, melting point of 120.10 deg.C, and molecular weight distribution index of 5.69.
Comparative example 2
The difference from example 1 is in the preliminary cleavage at 550 ℃.
The rest is the same as in example 1.
The physical and chemical properties of the obtained polyethylene wax are as follows: the polyethylene wax obtained had a deep yellow appearance, a diesel-like taste, a number average molecular weight of 720, a melting point of 60.20 ℃ and a molecular weight distribution index of 7.16.
To sum up, the utility model provides an equipment of useless polyethylene serialization schizolysis polyethylene wax, the method of preparing polyethylene wax by its useless polyethylene serialization schizolysis that forms the layer is unique, and its flow is simple and serialization: through four steps of raw material pretreatment, continuous cracking and product separation and refining, the complex operation processes of repeated heating and cooling, feeding and discharging and the like in the intermittent production process are avoided, the automation degree is high, the process is safe and reliable, the product property is stable, time and labor are saved, and the method is energy-saving and environment-friendly. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The equipment for preparing the polyethylene wax by continuously cracking the waste polyethylene is characterized by comprising a raw material pretreatment device (1), a continuous cracking reactor (2), a separator (3) and a refining tank (4) which are communicated with each other by materials in sequence according to the processing direction of the waste polyethylene.
2. The equipment for preparing the polyethylene wax by continuously cracking the waste polyethylene according to claim 1, wherein a polyethylene wax granulator (5) is further communicated with the downstream of the refining tank (4).
3. The apparatus for preparing polyethylene wax by continuous pyrolysis of waste polyethylene according to claim 2, wherein the polyethylene wax granulator (5) is a spray dryer or a pulverizer.
4. The apparatus for preparing polyethylene wax by continuous cracking of waste polyethylene according to claim 1, wherein: the continuous cracking reactor (2) is selected from one or more of a tubular reactor, a kettle type reactor, a fixed bed reactor and a slurry bed reactor.
5. The apparatus for preparing polyethylene wax by continuous cracking of waste polyethylene according to claim 1, wherein: the separator (3) is selected from one or more of a melt filter, a centrifugal separator, a hydrocyclone and a fractionation column.
6. The apparatus for preparing polyethylene wax by continuous pyrolysis of waste polyethylene according to claim 5, wherein: the filtration precision of the melt filter is 0.01-100 mu m.
7. The apparatus for preparing polyethylene wax by continuous pyrolysis of waste polyethylene according to claim 1, wherein: the separator (3) is provided with a gas phase product discharge passage.
8. The apparatus of claim 7 for preparing polyethylene wax by continuously cracking waste polyethylene, wherein: the gas-phase product discharge passage is connected with a gas recovery tank.
9. The apparatus for preparing polyethylene wax by continuous cracking of waste polyethylene according to claim 1, wherein: the refining tank (4) comprises one or more of a hydrofining tank, an oxygenation refining tank and a purification refining tank.
10. The apparatus for preparing polyethylene wax by continuous cracking of waste polyethylene according to claim 1, wherein: an auxiliary agent charging opening is arranged in the refining tank (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222641118.5U CN218689294U (en) | 2022-10-09 | 2022-10-09 | Equipment for preparing polyethylene wax by continuously cracking waste polyethylene |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222641118.5U CN218689294U (en) | 2022-10-09 | 2022-10-09 | Equipment for preparing polyethylene wax by continuously cracking waste polyethylene |
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| CN218689294U true CN218689294U (en) | 2023-03-24 |
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| CN202222641118.5U Active CN218689294U (en) | 2022-10-09 | 2022-10-09 | Equipment for preparing polyethylene wax by continuously cracking waste polyethylene |
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- 2022-10-09 CN CN202222641118.5U patent/CN218689294U/en active Active
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