A system and method for separating copolymerized polypropylene and homopolymerized polypropylene from waste plastics

Abstract

The present application relates to a system and method for separating copolymerized polypropylene and homopolymerized polypropylene from waste plastics, belonging to the technical field of solid waste recycling and sorting. The system provided by the present application comprises a size reduction module, a pre-sorting module, an identification module and a separation module. The method provided by the present application is as follows: the size of waste plastics is reduced through the size reduction module, then the polypropylene plastics in the form of sheets are obtained by color and material sorting, finally the homopolymerized polypropylene and the copolymerized polypropylene are marked and distinguished through the feature identification module, and the copolymerized polypropylene material and the homopolymerized polypropylene material are obtained through the separation module. The present application does not need to destroy the molecular structure of polypropylene itself, does not need to add chemical reagents or carry out chemical reactions, avoids secondary pollution, and has extremely low energy consumption. The two materials obtained by separation can realize high-value application in different fields, and solve the problem that waste plastics can only be downgraded in the conventional recycling process due to the inability to effectively grade.

Description

Technical Field

[0001] This invention relates to the field of solid waste recycling and sorting technology, and in particular to a system and method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics. Background Technology

[0002] Due to global economic tensions and competitive trends, the export of downstream garment and synthetic fiber products from the high-carbon petrochemical industry has been blocked, severely restricting industrial development. Post-consumer plastic recycling can significantly reduce carbon emissions. Based on this, the development of recycled polyester fiber (PET, actual usage rate 7.8%) has addressed this issue to some extent. However, recycled polypropylene fiber (PP, actual usage rate 19%), with its larger application and greater suitability for the garment industry, has not yet formed a large-scale industrial chain. Currently, polypropylene recycling technologies are relatively simple, mainly involving blending waste polypropylene with virgin materials or other materials to produce woven bags, composite flooring, and low-end daily-use plastic products. However, these products generally have low added value, making it impossible to achieve economies of scale. Furthermore, waste polypropylene materials can only be reused once; after downgrading and recycling, they become shorter molecular chains, easily forming microplastics and other pollutants, increasing the pressure on subsequent environmental pollution treatment.

[0003] The main reason limiting the reuse of polypropylene is that polypropylene materials are manufactured using two different monomers: copolymerization and homopolymerization. Various modifying materials are also added to achieve specific performance effects. However, during physical recycling, due to limitations in sorting technology, these polypropylene materials cannot be effectively distinguished, thus limiting their subsequent reuse. Chemical recycling processes use large amounts of reagents, resulting in the release of wastewater and exhaust gases, as well as significant energy consumption and carbon emissions, placing a burden on the environment. Therefore, classifying polypropylene materials, especially distinguishing between copolymer and homopolymer polypropylene materials, is a necessity for secondary resource utilization and a trend in environmental protection.

[0004] Currently, there is a lack of methods and equipment in existing technologies that can efficiently identify and separate copolymer polypropylene and homopolymer polypropylene. Therefore, developing a system and method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics will fill this technological gap and solve the problem that waste plastics can only be downgraded and reused due to the inability to effectively classify them during conventional recycling. This has significant practical implications. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a system and method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics. The system and method provided by this invention can achieve the non-destructive separation and recycling of copolymer polypropylene and homopolymer polypropylene from waste plastics, enabling high-value applications in various fields.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics, comprising the following steps:

[0008] S1. Size reduction: Waste plastic is crushed in two stages to reduce its size, resulting in sheet-like mixed plastic; the waste plastic is daily miscellaneous plastic recycled within 30 days of its disposal.

[0009] S2. Pre-sorting: The sheet-like mixed plastic is sorted by color and material to obtain sheet-like polypropylene plastic; the color sorting is to remove black and colored impurities;

[0010] S3. Identification: Infrared spectroscopy analysis was performed on the sheet-like polypropylene plastic, specifically the 1225-1275cm³ section... -1 The absorption peak intensity is u1, 1375-1400 cm⁻¹. -1 The absorption peak intensity is u2. Sheet polypropylene plastics marked with u1 > 0.3u2 are copolymer polypropylene; the remaining unmarked sheet polypropylene plastics are homopolymer polypropylene.

[0011] S4. Separation: The copolymer polypropylene and homopolymer polypropylene in the waste plastic are separated by the marking and sorting.

[0012] The method of this invention is mainly for recycling polypropylene-containing waste plastics from daily necessities, including lunch boxes, milk tea cups, beverage bottles, water buckets, etc., but does not include engineering plastics such as automotive plastics, electrical appliance plastics, and chemical drums. When using the method of this invention for separation, the waste plastics need to be recycled and processed within 30 days after they are scrapped. If the waste plastics are scrapped for more than 30 days, the polypropylene will decompose during the recycling process, which will seriously affect the separation effect of this method.

[0013] This invention first reduces waste plastic to a size that is easy to identify and a uniform sheet shape through a two-stage crushing process. The two-stage crushing can reduce the generation of polypropylene powder and reduce loss and waste. Then, through conventional color and material sorting methods, black and colored materials are first removed for subsequent sorting, and non-polypropylene materials are further removed to obtain sheet-shaped polypropylene plastic.

[0014] For the pre-treated sheet polypropylene plastic, the separation of copolymer polypropylene and homopolymer polypropylene is mainly achieved through infrared spectroscopy identification: Spectral images are acquired and analyzed using infrared recognition cameras and other equipment. The distinct characteristics of homopolymer and copolymer polypropylene are used for identification, and the copolymer polypropylene is then marked with a colorimetric label. Finally, the unmarked homopolymer polypropylene and the marked copolymer polypropylene are separated through a final separation process. In the identification step, the wavenumber range of the acquired infrared spectrum is kept within the range of 1225-1275 cm⁻¹. -1 The absorption peak intensity is u1, in the range of 1375-1400 cm⁻¹. -1 The absorption peak intensity is u2. Polypropylene plastics that meet the characteristic u1 > 0.3u2 are marked as copolymer polypropylene, and the rest are homopolymer polypropylene. This identification feature can accurately sort copolymer polypropylene materials and homopolymer polypropylene materials. If the characteristic standard is changed, some homopolymer and copolymer polypropylene will still be unable to be separated after sorting, and the maximum recycling can not be achieved.

[0015] The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics provided by this invention has a simple operation process, does not require destruction of the molecular structure of polypropylene itself, and does not require the addition of chemical reagents, thus avoiding secondary pollution. Moreover, the entire process of this invention is a physical process with extremely low energy consumption for sorting. The homopolymer polypropylene and copolymer polypropylene materials separated by this invention can be recycled and reused separately, realizing high-value applications in different fields, and solving the problem that conventional waste plastic recycling processes can only be downgraded due to the inability to effectively classify them.

[0016] Preferably, in step S1, the waste plastic is pretreated and then subjected to two-stage crushing to obtain sheet-like mixed plastic; the pretreatment includes manual sorting, magnetic separation, and eddy current separation.

[0017] For waste plastics containing glass glue, heavily soiled materials, chemical drums, pipes, or metal-containing materials, pretreatment using the methods described above is necessary to remove impurities.

[0018] Preferably, in S1, the two-stage crushing is shredding and crushing.

[0019] More preferably, the shredding is performed using a dual-shaft shredder, and the crushing is performed using a shear crusher.

[0020] The amount of polypropylene powder produced by crushing using other methods (such as hammer crushing or single-stage crushing) is 5 wt%. Using the above methods can reduce the amount of powder produced, controlling the amount of polypropylene powder produced to 2 wt%, which can increase the sorting efficiency and reduce material loss.

[0021] Preferably, in S1, the particle size of the sheet-like mixed plastic is 8-20 mm.

[0022] Preferably, in step S2, after rinsing the sheet-like mixed plastic with water and dehydrating it, color sorting and material sorting are performed. Rinsing with water removes impurities such as floating powder, resulting in plastic with a density of less than 1.

[0023] Preferably, in step S2, the material sorting method is near-infrared spectroscopy detection.

[0024] Preferably, in S2, the color of the sheet polypropylene plastic includes transparent, white, milky white, and grayish white.

[0025] Preferably, in step S3, the scanning range of the infrared spectroscopy analysis is 1000-1500 cm⁻¹. -1 More preferably, the infrared recognition band within the wavelength range is achieved using a beam splitter prism.

[0026] Preferably, in step S4, copolymer polypropylene and homopolymer polypropylene are separated by striking the marked sheet polypropylene plastic or the unmarked sheet polypropylene plastic.

[0027] More preferably, if the content of the marked sheet polypropylene plastic (i.e., copolymer polypropylene) is less than 40%, a pneumatic device is used to strike the marked sheet polypropylene plastic to achieve separation; if the content of the marked sheet polypropylene plastic is greater than 60%, a pneumatic device is used to strike the unmarked sheet polypropylene plastic (i.e., homopolymer polypropylene) to achieve separation. The content of the marked sheet polypropylene plastic is defined as the proportion of marked material containing the identification color to the total quantity of material, as identified by the machine.

[0028] If the labeled sheet polypropylene plastic content is higher than 60%, but it is still separated by hitting the labeled sheet polypropylene plastic, then the unlabeled sheet polypropylene plastic obtained after separation may be homopolymer polypropylene mixed with a large amount of copolymer polypropylene. In this case, it is necessary to repeat the identification and separation steps in S3 and S4 for further sorting.

[0029] Secondly, the present invention provides copolymer polypropylene materials and homopolymer polypropylene materials obtained by the above-described method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics.

[0030] Thirdly, the present invention provides a system for separating copolymer polypropylene and homopolymer polypropylene from waste plastics, characterized in that it includes a size reduction module, a pre-sorting module, an identification module, and a separation module; the system for separating copolymer polypropylene and homopolymer polypropylene from waste plastics operates using the method described above for separating copolymer polypropylene and homopolymer polypropylene from waste plastics.

[0031] The system for separating copolymer polypropylene and homopolymer polypropylene from waste plastics provided by the present invention performs two-stage crushing of waste plastics through a size reduction module to obtain sheet-like mixed plastics; a pre-sorting module removes colored plastics and other materials to obtain sheet-like polypropylene plastics; an identification module distinguishes and marks copolymer polypropylene materials and homopolymer polypropylene materials; and a separation module separates copolymer polypropylene materials and homopolymer polypropylene materials from waste plastics.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics provided by this invention mainly achieves rapid and accurate separation and recycling of copolymer polypropylene and homopolymer polypropylene materials through size reduction, pre-sorting, infrared identification, and separation steps. The method provided by this invention is simple, does not damage the molecular structure of polypropylene itself, and requires no chemical reagents, thus avoiding secondary pollution. Furthermore, the entire process is a physical process with extremely low energy consumption during sorting. The homopolymer and copolymer polypropylene materials separated by this invention can be used in various high-value applications. This invention solves the problem of resource value loss due to the downgrading of polypropylene waste plastics and reduces the environmental burden caused by chemical recycling, maximizing the value of polypropylene materials and having extremely high application value in the field of solid waste recycling. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the system modules for separating copolymer polypropylene and homopolymer polypropylene from waste plastics according to the present invention;

[0035] Figure 2 This is a comparison of the infrared spectra of the two types of polypropylene obtained by the method of separating copolymer polypropylene and homopolymer polypropylene from waste plastics according to the present invention. Detailed Implementation

[0036] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods; the materials and reagents used, unless otherwise specified, are commercially available reagents and materials.

[0037] Example 1

[0038] An embodiment of the system for separating copolymer polypropylene and homopolymer polypropylene from waste plastics according to the present invention is shown in the schematic diagram of its module composition. Figure 1 ;

[0039] The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics using the system described in this embodiment is as follows:

[0040] S1. Size Reduction Module: Compress 1000kg of daily necessities waste plastics collected within 30 days after disposal (sources include sorting centers, garbage baling stations, etc., with the amount of copolymer polypropylene and homopolymer polypropylene materials being basically the same). Cut off the binding wire on the unpacking machine and break up the compressed bag to obtain dispersed mixed daily necessities waste plastics.

[0041] The above-mentioned mixed plastic waste (such as glass glue, heavily soiled materials, chemical drums, pipes, metal-containing materials, etc.) was removed by manual sorting, resulting in mixed waste plastic 1, totaling 950 kg;

[0042] Magnetic separators were used to remove iron-containing components from mixed plastic 1; eddy current separators were then used to remove non-ferrous metal components, resulting in mixed plastic 2, totaling 900 kg.

[0043] The above-mentioned mixed plastic 2 was crushed using a dual-shaft shredder to obtain mixed plastic 3 with a larger size (≤10cm); the above-mentioned mixed plastic 3 was further crushed into 8-20mm using a pulverizer through shearing, to obtain sheet-like mixed plastic, totaling 891kg;

[0044] Water was added to the mixed plastic 3 during the crushing process to cool it down, and powder was carried out while cleaning the material, totaling 9kg.

[0045] Material transfer between the above-mentioned devices is carried out using belt conveyors.

[0046] S2. Pre-sorting module: The sheet-like mixed plastic obtained in step S1 above is placed in a water tank for rinsing. After being dehydrated by a dewatering machine, sheet-like floating mixed plastic with a density of less than 1 is obtained, totaling 800 kg.

[0047] The above-mentioned sheet-like floating mixed plastic is fed into a color sorting machine through a vibrating feeder to remove black and colored impurities. The remaining white, milky white, grayish white and transparent materials are the mixed plastic of the target color, totaling 600 kg.

[0048] The material is fed into a material sorting machine via a vibrating feeder. The material sorting camera is a hyperspectral near-infrared camera, which identifies and removes non-polypropylene plastics, resulting in sheet-like polypropylene plastics, totaling 400 kg.

[0049] S3. Identification Module: The sheet-like polypropylene waste plastic obtained in S2 is evenly distributed onto a conveyor belt with a pure black background using a vibrating feeder, ensuring that there is no material obstruction, and that the material passes through a wave number of 1500-1000cm. -1 An infrared recognition camera was used to obtain its spectral image, and an algorithm was used to identify wavenumbers of 1275-1225 cm⁻¹. -1 The absorption peak intensity is u1, 1375-1400 cm⁻¹. -1The absorption peak intensity is u2, and plastics with u1 > 0.3u2 are marked in yellow;

[0050] S4. Separation Module: Using a pneumatic device, the material marked in yellow is separated by impact, realizing the separation of copolymer and homopolymer polypropylene plastic. The material marked in yellow is copolymer polypropylene material, and a total of 200 kg of copolymer polypropylene material is obtained, while the remaining 200 kg is homopolymer polypropylene material.

[0051] The infrared spectrum comparison diagrams of homopolymer polypropylene and copolymer polypropylene are shown below. Figure 2 As shown.

[0052] Example 2

[0053] One embodiment of the system for separating copolymer polypropylene and homopolymer polypropylene from waste plastics according to the present invention, wherein the method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics using the system described in this embodiment is as follows:

[0054] S1. Size Reduction Module: Compress 1000kg of daily necessities waste plastics (from sorting centers, garbage baling stations, etc., with the amount of copolymer polypropylene material being 2-4 times that of homopolymer polypropylene material) collected within 30 days after being scrapped. Cut off the binding wire on the unpacking machine and break up the compressed bag to obtain dispersed mixed daily necessities waste plastics.

[0055] The above-mentioned mixed plastic waste (such as glass glue, heavily soiled materials, chemical drums, pipes, metal-containing materials, etc.) was removed by manual sorting, resulting in mixed waste plastic 1, totaling 970 kg;

[0056] Magnetic separator was used to remove iron-containing components from mixed plastic 1; eddy current separator was then used to remove non-ferrous metal components, resulting in mixed plastic 2, totaling 920 kg.

[0057] The above-mentioned mixed plastic 2 was crushed using a dual-shaft shredder to obtain mixed plastic 3 with a larger size (≤10cm); the above-mentioned mixed plastic 3 was further crushed into 8-20mm using a pulverizer through shearing, to obtain sheet-like mixed plastic, totaling 910kg;

[0058] Water was added to the mixed plastic 3 during the crushing process to cool it down, and powder was carried out while cleaning the material, totaling 10kg.

[0059] Material transfer between the above-mentioned devices is carried out using belt conveyors.

[0060] S2. Pre-sorting module: The sheet-like mixed plastic obtained in step S1 above is placed in a water tank for rinsing. After being dehydrated by a dewatering machine, sheet-like floating mixed plastic with a density of less than 1 is obtained, totaling 820 kg.

[0061] The above-mentioned sheet-like floating mixed plastic is fed into a color sorting machine through a vibrating feeder to remove black and colored impurities. The remaining white, milky white, grayish white and transparent materials are the mixed plastic of the target color, totaling 650 kg.

[0062] The material is fed into a material sorting machine via a vibrating feeder. The material sorting camera is a hyperspectral near-infrared camera, which identifies and removes non-polypropylene plastics, resulting in sheet-like polypropylene plastics, totaling 400 kg.

[0063] S3. Identification Module: The sheet-like polypropylene waste plastic obtained in S2 is evenly distributed onto a conveyor belt with a pure black background using a vibrating feeder, ensuring that there is no material obstruction, and that the material passes through a wave number of 1500-1000cm. -1 An infrared recognition camera was used to obtain its spectral image, and an algorithm was used to identify wavenumbers of 1275-1225 cm⁻¹. -1 The absorption peak intensity is u1, 1375-1400 cm⁻¹. -1 The absorption peak intensity is u2, and plastics with u1 > 0.3u2 are marked in yellow;

[0064] S4. Separation Module: Using a pneumatic device, the material marked in yellow is separated by impact, realizing the separation of copolymer and homopolymer polypropylene plastic. The material marked in yellow is copolymer polypropylene material, totaling 250kg, and the remaining 150kg is a mixture of homopolymer and copolymer polypropylene.

[0065] Repeat steps S3 and S4 once with the above 150kg mixture of homopolymer polypropylene and copolymer polypropylene to obtain 50kg copolymer polypropylene material and 100kg homopolymer polypropylene material.

[0066] 300 kg of copolymer polypropylene material and 100 kg of homopolymer polypropylene material were obtained by separation.

[0067] Comparative Example 1

[0068] Comparative Example 1 was processed from waste plastics collected 50 days after the end of the waste plastics packaging. The same system and method as in Example 1 were used for processing. In steps S3 and S4, it was not possible to effectively identify and separate homopolymer polypropylene and copolymer polypropylene materials, resulting in 400 kg of polypropylene mixture. It was not possible to separate copolymer polypropylene and homopolymer polypropylene from waste plastics.

[0069] Comparative Example 2

[0070] The only difference between the separation method of Comparative Example 2 and Example 1 is that color sorting is not performed in step S2. Therefore, subsequent steps S2 and S3 cannot effectively identify and sort the mixed plastic materials, and it is impossible to separate copolymer polypropylene and homopolymer polypropylene from waste plastic.

[0071] Comparative Example 3

[0072] The only difference between the separation method of Comparative Example 3 and Example 1 is that the material sorting operation is not performed in step S2, resulting in mixed plastic materials, and it is impossible to separate copolymer polypropylene and homopolymer polypropylene from waste plastic.

[0073] Comparative Example 4

[0074] The only difference between the separation method of Comparative Example 4 and Example 1 is that in step S3, plastics with u1 > 0.2u2 are marked in yellow. The 260 kg of marked material is polypropylene mixture, and the remaining 140 kg is homopolymer polypropylene material. Repeating steps S3 and S4 on the polypropylene mixture cannot achieve the simultaneous separation of copolymer polypropylene and homopolymer polypropylene from waste plastics.

[0075] Comparative Example 5

[0076] The only difference between the separation method of Comparative Example 5 and Example 1 is that in step S3, plastics with u1 > 0.4u2 are marked in yellow, and 150 kg of the marked copolymer polypropylene material is obtained. The remaining 250 kg is a polypropylene mixture. Repeating steps S3 and S4 on the polypropylene mixture cannot achieve the simultaneous separation of copolymer polypropylene and homopolymer polypropylene from waste plastics.

[0077] The results from the embodiments and comparative examples show that:

[0078] In Examples 1 and 2, the system and method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as defined in this invention are used to process waste plastics that meet the recycling period requirements. This method can effectively separate and recycle copolymer polypropylene and homopolymer polypropylene materials from waste plastics, which can then be reused in different production lines to achieve high-value applications in different fields. This solves the problem that conventional recycling of waste plastics can only be downgraded due to the inability to effectively classify them.

[0079] A comparison of Comparative Examples 1-5 with Example 1 shows that each processing and sorting step defined in this invention is indispensable; simultaneously, in conjunction with Figure 2 The comparison of the spectra shows that, in the S3 identification step, the quantitative relationship between the peak intensities u1 and u2 in the infrared spectra of copolymer polypropylene and homopolymer polypropylene within a specific wavenumber range is crucial for achieving accurate sorting of both materials simultaneously.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics, characterized in that, Includes the following steps: S1. Size reduction: Waste plastic is crushed in two stages to reduce its size, resulting in sheet-like mixed plastic; the waste plastic is daily miscellaneous plastic recycled within 30 days of its disposal. S2. Pre-sorting: The sheet-like mixed plastic is sorted by color and material to obtain sheet-like polypropylene plastic; the color sorting is to remove colored and black impurities; S3. Identification: Infrared spectroscopy analysis was performed on the sheet-like polypropylene plastic, specifically the 1225-1275cm³ section... -1 The absorption peak intensity is u1, 1375-1400 cm⁻¹. -1 The absorption peak intensity is u2. Sheet polypropylene plastics marked with u1 > 0.3u2 are copolymer polypropylene materials; the remaining unmarked sheet polypropylene plastics are homopolymer polypropylene materials. S4. Separation: The copolymer polypropylene and homopolymer polypropylene in the waste plastic are separated by the marking and sorting.

2. The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as described in claim 1, characterized in that, In step S1, the waste plastic is pre-treated and then subjected to two-stage crushing to obtain sheet-like mixed plastic; the pre-treatment includes manual sorting, magnetic separation, and eddy current separation.

3. The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as described in claim 1, characterized in that, In S1, the two-stage crushing is shredding and crushing.

4. The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as described in claim 1, characterized in that, In S1, the particle size of the sheet-like mixed plastic is 8-20 mm.

5. The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as described in claim 1, characterized in that, In step S2, the material sorting method is to use near-infrared spectroscopy detection.

6. The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as described in claim 1, characterized in that, In S2, the sheet polypropylene plastic includes colors such as transparent, white, milky white, and grayish white.

7. The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as described in claim 1, characterized in that, In step S3, the scanning range of the infrared spectroscopy analysis is 1000-1500 cm⁻¹. -1 .

8. The method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as described in claim 1, characterized in that, In step S4, copolymer polypropylene and homopolymer polypropylene are separated by pneumatically striking the marked sheet polypropylene plastic or the unmarked sheet polypropylene plastic.

9. A system for separating copolymer polypropylene and homopolymer polypropylene from waste plastics, characterized in that, The system includes a size reduction module, a pre-sorting module, an identification module, and a separation module; the system for separating copolymer polypropylene and homopolymer polypropylene from waste plastics is operated using the method for separating copolymer polypropylene and homopolymer polypropylene from waste plastics as described in any one of claims 1-8.

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