CN106432791A - Recovery process of polyethylene waste - Google Patents
Recovery process of polyethylene waste Download PDFInfo
- Publication number
- CN106432791A CN106432791A CN201610642126.8A CN201610642126A CN106432791A CN 106432791 A CN106432791 A CN 106432791A CN 201610642126 A CN201610642126 A CN 201610642126A CN 106432791 A CN106432791 A CN 106432791A
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- Prior art keywords
- polyethylene
- recovery process
- discarded object
- organic solvent
- waste
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- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention relates to a recovery process of polyethylene waste. The recovery process of the polyethylene waste comprises the following steps: (1) carrying out pretreatment on the polyethylene waste: carrying out surface spray cleaning and ultraviolet sterilization on the polyethylene waste; (2) breaking, dissolving and precipitating the polyethylene waste. The recovery process of the polyethylene waste disclosed by the invention has the beneficial effects of solving the problems of complex recovery process, high energy consumption and low added values of products in the prior art and providing the recovery process of the polyethylene waste with simple technological process, low energy consumption, small solvent consumption and high product performances through reasonable parameter setting.
Description
Technical field
The present invention relates to resource recycling field, be specifically related to the recovery process of a kind of polyethylene discarded object.
Background technology
At present, China is method and the physical method of chemical degradation to the main method of polyethylene recycling waste,
Chemical method refers to macromolecule generation degradation reaction under the effect of thermally and chemically reagent, forms the product of low-molecular-weight, product
Can be further with as monomer can be polymerized again, oil product can carry out deep processing, but chemical method needs HTHP, causes power consumption
High, condition harshness, requires height to equipment material, can be to realize large-scale operation.Physical method is by cutting off, pulverizing, heating
The recycle utilization that waste or used plastics is reprocessed by the operations such as fusing, but the performance of various regenerated plastics is than new material greatly
Reduce, and contain a large amount of impurity.
Content of the invention
The technical problem to be solved is that in prior art, plastics recycling process is complicated, and energy consumption is high, and product adds
It is worth low problem.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of recovery process of polyethylene discarded object, including
Following steps：
(1) pretreatment of polyethylene discarded object：Polyethylene discarded object is carried out surface spraying cleaning and ultraviolet sterilization；
(2) joining in pulverizer by the waste polyethylene material collected, it is the waste and old of 0.1-5mm that pulverizing obtains particle diameter
Polyethylene particle；
(3) at 50-80 DEG C, described waste polyethylene particle is put into the closed container equipped with the first organic solvent
In and stir 5-15min, make described waste polyethylene particle rapid solution, form homogeneous phase solution；
(4) adding adsorbent in above-mentioned solution, standing forms standing liquid a moment, by described standing liquid addition hole is
400-500 purpose the first filter filters, obtains a filter residue and first-time filtrate；
(5) 45-60 DEG C, under normal pressure, by the described first-time filtrate that obtains in step (4) under stirring, add the
Two organic solvents, separate out polyethylene powder, and initial gross separation obtains the dirty solution containing polyethylene powder and solvent solution；
(6) step (5) is contained the dirty solution of polyethylene powder, centrifugal dewatering in centrifuge, obtain centrifugal filtrate
And sediment；Dry the polyethylene powders of described sediment washing.
The invention has the beneficial effects as follows：Solve recovery process complexity in prior art, energy consumption height, low the asking of added value of product
Topic, technological process is simple, energy consumption is low, solvent-oil ratio is little to arrange offer one by rational parameter, high the gathering of properties of product
The recovery process of ethene discarded object.
On the basis of technique scheme, the present invention can also do following improvement：
Further, described step (5) also includes, the described solvent solution obtaining described step (5), at 75-85 DEG C
At a temperature of, carry out air-distillation and be separated and recovered from the second organic solvent and the step of the first organic solvent.
Further, the recovery process of described waste polyethylene material also includes step (7), and described step (7) is for institute
State and the centrifugal filtrate that step (6) obtains add described first organic solvent, and repeating said steps (2) is to described step (6),
The step carrying out secondary crystallization recovery.
Further, described first organic solvent is 1-METHYLPYRROLIDONE, described waste polyethylene particle and described N-first
The weight ratio of base pyrrolidones is 1：6-1：9.
Further, described waste polyethylene particle and the weight ratio of described 1-METHYLPYRROLIDONE are 1：8.
Further, the hole of described first filter is 450 mesh.
Further, described second organic solvent is methyl alcohol, the body of the addition of described methyl alcohol and described first organic solvent
Long-pending ratio is 1：1-1：4.
Further, described adsorbent is activated carbon, activated alumina, the one in polymeric adsorbent.
Detailed description of the invention
Being described the principle and feature of the present invention below, example is served only for explaining the present invention, is not intended to limit
Determine the scope of the present invention.
Embodiment 1
The recovery process of a kind of polyethylene discarded object of the present invention, comprises the following steps：
(1) pretreatment of polyethylene discarded object：Polyethylene discarded object is carried out surface spraying cleaning and ultraviolet sterilization；
(2) joining in pulverizer by the waste polyethylene material collected, it is the waste and old poly-of 0.1mm that pulverizing obtains particle diameter
Ethene particle；
(3) at 50 DEG C, described waste polyethylene particle is put into equipped with in the closed container of the first organic solvent simultaneously
Stirring 5min, makes described waste polyethylene particle rapid solution, forms homogeneous phase solution；
(4) adding adsorbent in above-mentioned solution, standing forms standing liquid a moment, by described standing liquid addition hole is
400 purpose the first filters filter, obtains a filter residue and first-time filtrate；
(5) 45 DEG C, under normal pressure, by the described first-time filtrate that obtains in step (4) under stirring, add second to have
Machine solvent, separates out polyethylene powder, and initial gross separation obtains the dirty solution containing polyethylene powder and solvent solution；
(6) step (5) is contained the dirty solution of polyethylene powder, centrifugal dewatering in centrifuge, obtain centrifugal filtrate
And sediment；Dry the polyethylene powders of described sediment washing.
Further, described step (5) also includes, the described solvent solution obtaining described step (5), the temperature of 75 DEG C
Under, carry out air-distillation and be separated and recovered from the second organic solvent and the step of the first organic solvent.
The recovery process of described waste polyethylene material also includes step (7), and described step (7) is for described step
(6) centrifugal filtrate obtaining adds described first organic solvent, and repeating said steps (2) is to described step (6), carries out two
The step that secondary crystallization is reclaimed.
Described first organic solvent is 1-METHYLPYRROLIDONE, described waste polyethylene particle and described N-crassitude
The weight ratio of ketone is 1：6.
Described second organic solvent is methyl alcohol, and the addition of described methyl alcohol is 1 with the volume ratio of described first organic solvent：
1.
Described adsorbent is activated carbon.
Embodiment 2
The recovery process of a kind of polyethylene discarded object of the present invention, comprises the following steps：
(1) pretreatment of polyethylene discarded object：Polyethylene discarded object is carried out surface spraying cleaning and ultraviolet sterilization；
(2) the waste polyethylene material collected is joined in pulverizer, pulverize and obtain the waste and old poly-second that particle diameter is 5mm
Alkene particle；
(3) at 80 DEG C, described waste polyethylene particle is put into equipped with in the closed container of the first organic solvent simultaneously
Stirring 15min, makes described waste polyethylene particle rapid solution, forms homogeneous phase solution；
(4) adding adsorbent in above-mentioned solution, standing forms standing liquid a moment, by described standing liquid addition hole is
500 purpose the first filters filter, obtains a filter residue and first-time filtrate；
(5) 60 DEG C, under normal pressure, by the described first-time filtrate that obtains in step (4) under stirring, add second to have
Machine solvent, separates out polyethylene powder, and initial gross separation obtains the dirty solution containing polyethylene powder and solvent solution；
(6) step (5) is contained the dirty solution of polyethylene powder, centrifugal dewatering in centrifuge, obtain centrifugal filtrate
And sediment；Dry the polyethylene powders of described sediment washing.
Described step (5) also includes, the described solvent solution obtaining described step (5), at a temperature of 85 DEG C, carries out
Air-distillation is separated and recovered from the second organic solvent and the step of the first organic solvent.
The recovery process of described waste polyethylene material also includes step (7), and described step (7) is for described step
(6) centrifugal filtrate obtaining adds described first organic solvent, and repeating said steps (2) is to described step (6), carries out
The step that secondary crystallization reclaims.
Described first organic solvent is 1-METHYLPYRROLIDONE, described waste polyethylene particle and described N-crassitude
The weight ratio of ketone is 1：9.
Described second organic solvent is methyl alcohol, and the addition of described methyl alcohol is 1 with the volume ratio of described first organic solvent：
4.
Described adsorbent is activated alumina.
Embodiment 3
The recovery process of a kind of polyethylene discarded object of the present invention, comprises the following steps：
(1) pretreatment of polyethylene discarded object：Polyethylene discarded object is carried out surface spraying cleaning and ultraviolet sterilization；
(2) the waste polyethylene material collected is joined in pulverizer, pulverize and obtain the waste and old poly-second that particle diameter is 1mm
Alkene particle；
(3) at 70 DEG C, described waste polyethylene particle is put into equipped with in the closed container of the first organic solvent simultaneously
Stirring 8min, makes described waste polyethylene particle rapid solution, forms homogeneous phase solution；
(4) adding adsorbent in above-mentioned solution, standing forms standing liquid a moment, by described standing liquid addition hole is
450 purpose the first filters filter, obtains a filter residue and first-time filtrate；
(5) 50 DEG C, under normal pressure, by the described first-time filtrate that obtains in step (4) under stirring, add second to have
Machine solvent, separates out polyethylene powder, and initial gross separation obtains the dirty solution containing polyethylene powder and solvent solution；
(6) step (5) is contained the dirty solution of polyethylene powder, centrifugal dewatering in centrifuge, obtain centrifugal filtrate
And sediment；Dry the polyethylene powders of described sediment washing.
Described step (5) also includes, the described solvent solution obtaining described step (5), at a temperature of 78 DEG C, carries out
Air-distillation is separated and recovered from the second organic solvent and the step of the first organic solvent.
The recovery process of described waste polyethylene material also includes step (7), and described step (7) is for described step
(6) centrifugal filtrate obtaining adds described first organic solvent, and repeating said steps (2) is to described step (6), carries out two
The step that secondary crystallization is reclaimed.
Described first organic solvent is 1-METHYLPYRROLIDONE, described waste polyethylene particle and described N-crassitude
The weight ratio of ketone is 1：8.
Described second organic solvent is methyl alcohol, and the addition of described methyl alcohol is 1 with the volume ratio of described first organic solvent：
2.
Described adsorbent is in polymeric adsorbent.
Embodiment 4
The recovery process of a kind of polyethylene discarded object of the present invention, comprises the following steps：
(1) pretreatment of polyethylene discarded object：Polyethylene discarded object is carried out surface spraying cleaning and ultraviolet sterilization；
(2) the waste polyethylene material collected is joined in pulverizer, pulverize and obtain the waste and old poly-second that particle diameter is 2mm
Alkene particle；
(3) at 60 DEG C, described waste polyethylene particle is put into equipped with in the closed container of the first organic solvent simultaneously
Stirring 12min, makes described waste polyethylene particle rapid solution, forms homogeneous phase solution；
(4) adding adsorbent in above-mentioned solution, standing forms standing liquid a moment, by described standing liquid addition hole is
450 purpose the first filters filter, obtains a filter residue and first-time filtrate；
(5) 55 DEG C, under normal pressure, by the described first-time filtrate that obtains in step (4) under stirring, add second to have
Machine solvent, separates out polyethylene powder, and initial gross separation obtains the dirty solution containing polyethylene powder and solvent solution；
(6) step (5) is contained the dirty solution of polyethylene powder, centrifugal dewatering in centrifuge, obtain centrifugal filtrate
And sediment；Dry the polyethylene powders of described sediment washing.
Described step (5) also includes, the described solvent solution obtaining described step (5), at a temperature of 82 DEG C, carries out
Air-distillation is separated and recovered from the second organic solvent and the step of the first organic solvent.
The recovery process of described waste polyethylene material also includes step (7), and described step (7) is for described step
(6) centrifugal filtrate obtaining adds described first organic solvent, and repeating said steps (2) is to described step (6), carries out two
The step that secondary crystallization is reclaimed.
Described first organic solvent is 1-METHYLPYRROLIDONE, described waste polyethylene particle and described N-crassitude
The weight ratio of ketone is 1：7.
Described second organic solvent is methyl alcohol, and the addition of described methyl alcohol is 1 with the volume ratio of described first organic solvent：
3.
Described adsorbent is activated carbon.
Comparative example 1
The recovery process of a kind of polyethylene discarded object, comprises the following steps：
(1) joining in pulverizer by the waste polyethylene material collected, it is the waste and old of 10-20mm that pulverizing obtains particle diameter
Polyethylene particle；
(2) described waste polyethylene particle is put into equipped with in the closed container of 1-METHYLPYRROLIDONE and stir 5-
15min, makes described waste polyethylene particle rapid solution, forms homogeneous phase solution；
(3) after above-mentioned homogeneous filtrate being filtered, filtrate adds methyl alcohol while stirring, separate out polyethylene powder, and
Initial gross separation obtains dirty solution and solvent solution containing polyethylene powder；
(4) step (3) is contained the dirty solution of polyethylene powder, centrifugal dewatering in centrifuge, obtain centrifugal filtrate
And sediment；Dry the polyethylene powders of described sediment washing.
In above-described embodiment 1-4 and comparative example 1, the proterties of product and yield are as shown in Table 1：
Table one：The proterties of product and yield in above-described embodiment 1-4 and comparative example 1
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (8)
1. the recovery process of a polyethylene discarded object, it is characterised in that comprise the following steps：
(1) pretreatment of polyethylene discarded object：Polyethylene discarded object is carried out surface spraying cleaning and ultraviolet sterilization；
(2) the waste polyethylene material collected is joined in pulverizer, pulverize and obtain the waste and old poly-second that particle diameter is 0.1-5mm
Alkene particle；
(3) at 50-80 DEG C, described waste polyethylene particle is put into equipped with in the closed container of the first organic solvent and stir
Mix 5-15min, make described waste polyethylene particle rapid solution, form homogeneous phase solution；
(4) adding adsorbent in above-mentioned solution, standing a moment and form standing liquid, described standing liquid is added hole is 400-
500 purpose the first filters filter, obtains a filter residue and first-time filtrate；
(5) 45-60 DEG C, under normal pressure, by the described first-time filtrate that obtains in step (4) under stirring, add second to have
Machine solvent, separates out polyethylene powder, and initial gross separation obtains the dirty solution containing polyethylene powder and solvent solution；
(6) step (5) is contained the dirty solution of polyethylene powder, centrifugal dewatering in centrifuge, obtain centrifugal filtrate and sink
Shallow lake thing；Dry the polyethylene powders of described sediment washing.
2. the recovery process of polyethylene discarded object according to claim 1, it is characterised in that described step (5) also includes,
The described solvent solution obtaining described step (5), at a temperature of 75-85 DEG C, carries out air-distillation and is separated and recovered from second
Organic solvent and the step of the first organic solvent.
3. the recovery process of polyethylene discarded object according to claim 2, it is characterised in that described waste polyethylene material
The recovery process of material also includes step (7), and described step (7) is described for adding in the centrifugal filtrate that described step (6) obtains
First organic solvent, and repeating said steps (2) is to described step (6), the step carrying out secondary crystallization recovery.
4. the recovery process of the polyethylene discarded object according to claim 1-3 is arbitrary, it is characterised in that described first organic
Solvent is 1-METHYLPYRROLIDONE, and described waste polyethylene particle is 1 with the weight ratio of described 1-METHYLPYRROLIDONE：6-1：9.
5. the recovery process of polyethylene discarded object according to claim 4, it is characterised in that described waste polyethylene particle
Weight ratio with described 1-METHYLPYRROLIDONE is 1：8.
6. the recovery process of the polyethylene discarded object according to claim 1-3 or 5 are arbitrary, it is characterised in that described first
The hole of filter is 450 mesh.
7. the recovery process of the polyethylene discarded object according to claim 1-3 or 5 are arbitrary, it is characterised in that described second
Organic solvent is methyl alcohol, and the addition of described methyl alcohol is 1 with the volume ratio of described first organic solvent：1-1：4.
8. the recovery process of the polyethylene discarded object according to claim 1-7 is arbitrary, it is characterised in that described adsorbent is
One in activated carbon, activated alumina, polymeric adsorbent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610642126.8A CN106432791A (en) | 2016-08-08 | 2016-08-08 | Recovery process of polyethylene waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610642126.8A CN106432791A (en) | 2016-08-08 | 2016-08-08 | Recovery process of polyethylene waste |
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| Publication Number | Publication Date |
|---|---|
| CN106432791A true CN106432791A (en) | 2017-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610642126.8A Pending CN106432791A (en) | 2016-08-08 | 2016-08-08 | Recovery process of polyethylene waste |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108189277A (en) * | 2018-01-08 | 2018-06-22 | 李旷 | A kind of recycling technique of polyethylene |
| CN111187473A (en) * | 2020-03-30 | 2020-05-22 | 苏州润佳工程塑料股份有限公司 | Method for recycling recycled polypropylene material |
| CN116396546A (en) * | 2023-03-21 | 2023-07-07 | 昆山泰玖电子有限公司 | High-elasticity foam material and manufacturing process thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102911396A (en) * | 2012-10-22 | 2013-02-06 | 广东树业环保科技股份有限公司 | Process for recovering waste polyethylene glycol terephthalate (PET) material |
| CN105061806A (en) * | 2015-07-22 | 2015-11-18 | 浦江县金鑫废旧物资回收有限公司 | Recovery process of ultra-high molecular weight polyethylene waste |
-
2016
- 2016-08-08 CN CN201610642126.8A patent/CN106432791A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102911396A (en) * | 2012-10-22 | 2013-02-06 | 广东树业环保科技股份有限公司 | Process for recovering waste polyethylene glycol terephthalate (PET) material |
| CN105061806A (en) * | 2015-07-22 | 2015-11-18 | 浦江县金鑫废旧物资回收有限公司 | Recovery process of ultra-high molecular weight polyethylene waste |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108189277A (en) * | 2018-01-08 | 2018-06-22 | 李旷 | A kind of recycling technique of polyethylene |
| CN111187473A (en) * | 2020-03-30 | 2020-05-22 | 苏州润佳工程塑料股份有限公司 | Method for recycling recycled polypropylene material |
| CN116396546A (en) * | 2023-03-21 | 2023-07-07 | 昆山泰玖电子有限公司 | High-elasticity foam material and manufacturing process thereof |
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