CN116574304A - Method, recording medium and system for recycling and purifying polypropylene waste - Google Patents
Method, recording medium and system for recycling and purifying polypropylene waste Download PDFInfo
- Publication number
- CN116574304A CN116574304A CN202310446232.9A CN202310446232A CN116574304A CN 116574304 A CN116574304 A CN 116574304A CN 202310446232 A CN202310446232 A CN 202310446232A CN 116574304 A CN116574304 A CN 116574304A
- Authority
- CN
- China
- Prior art keywords
- polypropylene
- waste
- recycling
- polypropylene waste
- ethylbenzene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 64
- -1 polypropylene Polymers 0.000 title claims abstract description 64
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 63
- 239000002699 waste material Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004064 recycling Methods 0.000 title claims description 19
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000012545 processing Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 abstract description 16
- 229920003023 plastic Polymers 0.000 abstract description 16
- 239000000463 material Substances 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 7
- 238000000746 purification Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 5
- 238000004821 distillation Methods 0.000 abstract description 2
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- 230000001052 transient effect Effects 0.000 abstract 1
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000003860 storage Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000010786 composite waste Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
- C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- 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
Abstract
The application belongs to the technical field of waste plastic recovery, and particularly relates to a recovery and purification method of polypropylene waste, which comprises the following steps: mixing the crushed polypropylene waste with liquid ethylbenzene according to a certain proportion, placing the mixture into a closed reaction container, heating the mixture to a set temperature to dissolve the polypropylene waste in the liquid ethylbenzene, and obtaining pure polypropylene reclaimed materials after filtration, purification and distillation. According to the application, the polypropylene waste is dissolved in ethylbenzene at a specific temperature, so that insoluble impurities are removed more easily, the microstructure of polypropylene is recovered, and meanwhile, the stress accumulated in the forming or using process is removed, so that the mechanical property and appearance quality of the regenerated material are improved. Is suitable for popularization and application in the regeneration process of polypropylene waste. The application also provides a non-transient readable recording medium storing a program of a recovery and purification method of polypropylene waste and a device containing the medium, and the program can be called by a processing circuit to execute the method.
Description
Technical Field
The application belongs to the technical field of waste plastic recovery, and discloses a recovery and purification method of polypropylene waste, and a recording medium and a system which can execute the program of the method are stored.
Background
The recycling of waste plastics is beneficial to environmental protection and resource conservation, and thermoplastic plastic wastes are valuable renewable resources, and the thermoplastic plastic wastes can be recycled and granulated or can be reused for producing plastic products through reconstruction after modification.
Different kinds of waste plastics have different characteristics, the impurity content of the leftover materials in factory production is lower than 0.1%, the impurity content of the leftover materials and other used products piled for a certain time is 0.1% -0.5%, and the impurity content of the composite waste plastics mixed with aluminum, cloth and paper is often more than 10%. For the used waste plastics, according to different use conditions, coarse washing should be performed first to remove foreign matters such as sand, stones and metals, so as to prevent damage to the crusher. The waste plastic product fragments are centrifugally dehydrated after rough washing, sent into a crusher for crushing, and then further washed to remove sundries occluded in the waste plastic product fragments. If the waste plastics contain greasy dirt, the waste plastics are generally soaked in alkaline water or warm washing liquid with proper concentration, then friction and collision are generated among the waste plastics blocks (sheets) through stirring, dirt is removed, and the waste plastics are dehydrated and dried for reconstruction for standby after rinsing.
The polypropylene plastic in the waste plastic recycling industry has a large proportion, and because of the thermal history and shearing history in the molding processing process and the effects of heat, oxygen, light, weather and various media in the use process, the polypropylene reclaimed material only subjected to crushing, filtering, drying and granulating is reduced in performance compared with the completely new polypropylene raw material, in particular, the mechanical properties, including tensile strength and impact property, of the polypropylene reclaimed material are lower than those of the original resin, and the surface structure change, the color yellowing and the transparency reduction are caused by cracking.
How to obtain pure polypropylene reclaimed materials as much as possible, and recover the microstructure of polypropylene waste materials through special process treatment in the production flow of the reclaimed materials, and remove stress accumulated in the forming or using process, so that the physicochemical index of the reclaimed materials is closer to that of the totally new materials, which is a problem of constant research by those skilled in the art.
Disclosure of Invention
Aiming at the problems, the application provides a method for recycling and purifying polypropylene waste, which comprises the following steps:
s1, mixing crushed polypropylene waste and liquid ethylbenzene according to a certain proportion, and placing the mixture in a closed reaction container, wherein the certain proportion is 0.3-0.5 volume ratio;
s2, heating the reaction container to enable the polypropylene waste and the liquid ethylbenzene to reach a set temperature, and preserving heat until the polypropylene in the polypropylene waste is completely dissolved in the liquid ethylbenzene, wherein the set temperature is 120-134 ℃;
s3, filtering insoluble substances from the product obtained in the step S2 to obtain an ethylbenzene solution of polypropylene;
s4, removing the color of the ethylbenzene solution of the polypropylene through an adsorption medium, and then distilling to obtain polypropylene powder, and condensing and recycling vaporized ethylbenzene for later use.
Preferably, the certain proportion is 0.4 volume ratio.
Preferably, the adsorption medium is activated carbon.
Preferably, the method further comprises the step of preparing the polypropylene powder into polypropylene particles.
Another aspect of the present application is to provide a non-transitory readable recording medium storing one or more programs including a plurality of instructions, which when executed, cause a processing circuit to perform a method for recycling and purifying polypropylene waste as described above.
In another aspect, the present application provides a system for recycling and purifying polypropylene waste, which includes a processing circuit and a memory electrically coupled to the processing circuit, wherein the memory is configured to store at least one program, the program includes a plurality of instructions, and the processing circuit runs the program to execute the method for recycling and purifying polypropylene waste.
Compared with the prior art, the application has the following beneficial effects:
according to the application, the polypropylene waste is dissolved in ethylbenzene at a specific temperature to form fluid, so that insoluble impurities are removed more easily, the polypropylene fragments become uniform fluid, the microstructure of the polypropylene is recovered, and meanwhile, the stress accumulated in the forming or using process is removed, so that the mechanical property and appearance quality of the regenerated material are improved. The present application overcomes the conventional concept that polypropylene is generally considered to be insoluble in ethylbenzene by those skilled in the art and successfully eliminates the technical hurdle that ethylbenzene as a solvent is easily volatilized after heating.
Drawings
FIG. 1 is a schematic process flow diagram of recovery and purification of polypropylene waste in an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application, where the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, based on the embodiments of the application, which are obtained by a person skilled in the art without innovative work, are intended to be within the scope of the application.
An embodiment of a method for recovering and purifying polypropylene scraps comprises the following steps:
crushed polypropylene waste and liquid ethylbenzene were mixed according to a ratio of 0.4:1, placing the mixture in a closed reaction container;
heating the reaction vessel to enable the polypropylene waste and the liquid ethylbenzene to reach 130 ℃, and preserving heat until the polypropylene in the polypropylene waste is completely dissolved in the liquid ethylbenzene;
filtering the liquid obtained in the step through a 10000-mesh filter screen, and cleaning undissolved substances and fillers to obtain an ethylbenzene solution of polypropylene;
and (3) carrying out distillation after the ethylbenzene solution of the polypropylene is subjected to activated carbon adsorption and de-coloring to obtain polypropylene powder with higher purity, and condensing and recycling vaporized ethylbenzene for standby.
And preparing the polypropylene powder into polypropylene particles.
The performance test of the reclaimed materials produced by using the polypropylene waste woven bags through the scheme and 045 brand PP powder produced by Yueyang petrochemical industry is compared as follows:
by comparison, the performance index of the reclaimed materials prepared by the scheme is close to the corresponding index of Yue Hua 045 powder, which is difficult to reach by the conventional plastic recycling method.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the application may take the form of a computer program product embodied on one or more computers, usable storage media (including but not limited to disk storage, CD-ROM, optical storage, and the like) having computer usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The method comprises the steps of assembling the steps into a program and storing the program in a hard disk or other non-transitory storage media, so that the technical scheme of the non-transitory readable recording medium is formed; the storage medium is electrically connected with a computer processor, and the regeneration of the polypropylene waste can be completed through data processing, so that the technical scheme of the recovery and purification system of the polypropylene waste is formed.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present application, and the present application is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present application has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. The method for recycling and purifying the polypropylene waste is characterized by comprising the following steps of:
s1, mixing crushed polypropylene waste and liquid ethylbenzene according to a certain proportion, and placing the mixture in a closed reaction container, wherein the certain proportion is 0.3-0.5 volume ratio;
s2, heating the reaction container to enable the polypropylene waste and the liquid ethylbenzene to reach a set temperature, and preserving heat until the polypropylene in the polypropylene waste is completely dissolved in the liquid ethylbenzene, wherein the set temperature is 120-134 ℃;
s3, filtering insoluble substances from the product obtained in the step S2 to obtain an ethylbenzene solution of polypropylene;
s4, removing the color of the ethylbenzene solution of the polypropylene through an adsorption medium, and then distilling to obtain polypropylene powder, and condensing and recycling vaporized ethylbenzene for later use.
2. The method for recycling and purifying polypropylene waste according to claim 1, wherein the certain ratio is 0.4 by volume.
3. The method for recycling and purifying polypropylene waste according to claim 2, wherein the adsorption medium is activated carbon.
4. A method for recycling and purifying polypropylene waste material according to claim 3, further comprising the step of forming said polypropylene powder into polypropylene particles.
5. A non-transitory readable recording medium storing one or more programs comprising a plurality of instructions, wherein the instructions, when executed, cause a processing circuit to perform a method of recycling and purifying polypropylene waste according to any one of claims 1-4.
6. A system for recycling and purifying polypropylene waste comprising a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program comprising a plurality of instructions, the processing circuit running the program to perform a method for recycling and purifying polypropylene waste as claimed in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310446232.9A CN116574304A (en) | 2023-04-24 | 2023-04-24 | Method, recording medium and system for recycling and purifying polypropylene waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310446232.9A CN116574304A (en) | 2023-04-24 | 2023-04-24 | Method, recording medium and system for recycling and purifying polypropylene waste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116574304A true CN116574304A (en) | 2023-08-11 |
Family
ID=87535064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310446232.9A Pending CN116574304A (en) | 2023-04-24 | 2023-04-24 | Method, recording medium and system for recycling and purifying polypropylene waste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116574304A (en) |
-
2023
- 2023-04-24 CN CN202310446232.9A patent/CN116574304A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |