CN105237799B - The renovation process of waste or used plastics containing PBBs and PBDE - Google Patents
The renovation process of waste or used plastics containing PBBs and PBDE Download PDFInfo
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- CN105237799B CN105237799B CN201510752785.2A CN201510752785A CN105237799B CN 105237799 B CN105237799 B CN 105237799B CN 201510752785 A CN201510752785 A CN 201510752785A CN 105237799 B CN105237799 B CN 105237799B
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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
Abstract
The present invention relates to the renovation process containing PBBs and the waste or used plastics of PBDE, separation and the regeneration method of a kind of brominated Flameproof styrenic class plastics are disclosed.This method adds waste and old brominated Flameproof styrenic class plastics in solvent orange 2 A, dissolves the styrene plastic of brominated Flameproof styrenic class plastics；Plastic solution after dissolving is heated by bolter, the plastic solution of acquisition, decabromodiphenyl oxide dissolving, antimony oxide etc. is removed using heat filtering；The solution that heat filtering obtains cools to 0 DEG C；Add solvent B；Solution is aged at 0 DEG C again；Eliminate little particle crystal；Separated with centrifuge, obtain decabromodiphenyl oxide particle；Solution is warming up to 20~50 DEG C, adds solvent B, by plastics Precipitation, realizes that plastics separate with poisonous fire retardant；The plastics sediment of acquisition is sent into extruder, deviates from the solvent remained in sediment, acquisition regenerates plastic product；The present invention realizes the separation of poisonous brominated flame-retardant and nontoxic brominated flame-retardant, while reaches the recycling purpose of waste and old electric electricity plastics and brominated flame-retardant.
Description
Technical field
The present invention relates to being separated containing a kind of plastic waste, more particularly to a kind of separation of brominated Flameproof styrenic class plastics
With regeneration method；More particularly to regenerating polystyrene (PS), high from brominated Flameproof styrenic class plastics caused by sorting
The styrene plastics such as impact-resistant polystyrene (HIPS), styrene-butadiene-acrylonitrile (ABS), while realize poisonous bromo resistance
Fire agent and the separation of nontoxic brominated flame-retardant.
Background technology
Disassembling for waste and old electric electric equipment produces substantial amounts of flame retardant plastics waste, more using Density Separation, x fluorescence at present
It is brominated and not brominated waste or used plastics that the technologies such as spectral matching factor, which are sorted, wherein not brominated plastics can use common modeling
The regeneration techniques of material is utilized；And brominated plastics, it is different according to the electronic device types disassembled, generally there is fire retardant polystyrene
(high impact polystyrene) plastics, Flameproof styrenic-butadiene-acrylonitrile plastics etc., these plastic wastes are due to that may contain
The PBDE of poison, the brominated flame-retardant such as tetrabromobisphenol A, it is necessary to carry out debrominate processing after can use.
For brominated flame retardant plastics, prior art is typically regenerated using dissolving agent process, such as Chinese invention patent
ZL00801987.8 uses dihydric alcohol system, glycol ether system or lactic acid ester series solvent from the plastics of solid-state or molten state by more bromines
Biphenyl Ether and other fire retardants extract.Patented invention patent ZL01116994.X, ZL200910214489.1 and
CN201210004960 etc. separates brominated flame-retardant using pressure fluid, supercritical fluid or hot solvent from flame retardant plastics, but
Because the solvability deficiency of solvent or the resistance to mass tranfer of process in leaching are excessive, separating effect have impact on.United States Patent (USP)
US6500872 selects suitable solvent that then dissolving plastic is isolated into undissolved fire-retardant particles from plastic solution, then
Plastics are separated with soluble flame retardant using anti-solvent sedimentation, although separation process is without using the molten of high-solvency
Agent, but still fire-retardant particles too small the problem of causing to separate difficulty be present.
Problem is separated out again for the short grained separation difficulty of decabromodiphenyl oxide and anti-solvent precipitation process decabromodiphenyl oxide, in
State's patent of invention 201010550611.5 is using the excessive fresh solvent of the addition before anti-solvent precipitates come ten in solvent soln
Bromo biphenyl ether particulate, and decabromodiphenyl oxide is maintained at undersaturated condition to avoid its precipitation in anti-solvent precipitation process.But by
It is very low in solubility of the decabromodiphenyl oxide in using dicyandiamide solution, if in separation process that decabromodiphenyl oxide is complete
Be maintained at undersaturated condition, it is necessary to quantity of solvent it is just very big, excessive solvent internal circulating load is all not to equipment size and energy consumption
Profit.
In styrene plastic waste in common brominated flame-retardant, except PBDE (PBDEs), tetrabromobisphenol A
(TBBPA), outside the poisonous fire retardant such as HBCD (HBCD), in addition to TDE (DBPE), brominated polyphenylene second
Alkene etc. is considered as nontoxic fire retardant, is still widely used at present.The toxicity of other decabromodiphenyl oxide (DBDPO) is due to existing
Dispute, although disabled in European Union and Systems in Certain Developed Countries, it is still permitted to use in China and most developing countries.
The brominated flame retardant plastics of prior art processing, existing subject matter are as follows：
1st, because most brominated flame-retardants are difficult to dissolve in organic solvent, process in leaching diffusional resistance is big, therefore directly
Separated and dissolved is carried out to brominated flame-retardant from plastics, efficiency is low, and debrominate effect is poor.
Although the 2, can improve dissolubility using pressure, supercritical fluid, operating condition is harsh, is not suitable for large-scale industry
Change application.
3rd, regenerate by the way of solid plastic to be transformed into solvent plastic solution, disappeared by the method for adding fresh solvent
Except the decabromodiphenyl oxide little particle in solution, reach the purpose for improving separating effect, solvent usage amount can be caused excessive, to recovery
Process is unfavorable.
4th, prior art cannot be distinguished by poisonous, nontoxic brominated flame-retardant, and the fire retardant separated is various brominated flame retardants
The mixture of agent, because which part fire retardant is still advantageous to be worth, it is therefore desirable to which further processing could realize its recycling
Utilize.
The content of the invention
In view of the shortcomings of the prior art, the present invention is different for fire retardant toxicity, it is proposed that a kind of brominated Flameproof styrenic
The cleaning renovation process of class plastics, and the separation of poisonous brominated flame-retardant and nontoxic brominated flame-retardant is realized, while reach waste and old
The recycling purpose of electronics electricity plastics and brominated flame-retardant.
The purpose of the present invention is achieved through the following technical solutions：
A kind of separation of brominated Flameproof styrenic class plastics and regeneration method, it is characterised in that comprise the following steps：
(1) waste and old brominated Flameproof styrenic class plastics are added in solvent orange 2 A, controls plastic quality percentage composition in solution
For 10~20%, solvent orange 2 A dissolves the styrene plastic of brominated Flameproof styrenic class plastics, other plastics, part fire retardant and
Impurity does not dissolve；Described solvent orange 2 A is toluene, dimethylbenzene, butanone, propiophenone, cyclohexanone, methyl isoamyl ketone, limonene, double
Amylene, tetrahydrofuran, the one or more of butyl acetate and ethyl acetate；
(2) plastic solution after dissolving sifts out undissolved insoluble plastics and impurity by bolter, undissolved fire-retardant
Agent particle continues to stay in the solution；
(3) plastic solution obtained in step (2) is heated, until decabromodiphenyl oxide is completely dissolved, removed using heat filtering
Remove antimony oxide, TDE particulate matter；
(4) solution that step (3) heat filtering obtains is cooled to 0 DEG C；Add the solution quality 1~10% that heat filtering obtains
Solvent B；Solution is aged 5-10 hours at 0 DEG C again；By a small amount of little particle dissolution of crystals of crystallization process formation and shift
Onto bulky grain crystal, the particle diameter of decabromodiphenyl oxide particle is improved, eliminates little particle crystal；Separated with centrifuge, obtain ten bromines
Biphenyl Ether particle；Decabromodiphenyl oxide particle is cleaned, it is broken after use again；The solvent B is monoalcohol solvent；
(5) step (4) is separated to the solution after decabromodiphenyl oxide particle and is warming up to 20~50 DEG C, is added molten equivalent to plastics
The solvent B of liquid quality 100~200%, by plastics Precipitation, and PBDE, tetrabromobisphenol A, HBCD energy
Stay the separation in the solution, realizing plastics and poisonous fire retardant；
(6) the plastics sediment for obtaining step (5) is sent into extruder, deviates from sediment to remain at 180-220 DEG C
Solvent, acquisition regenerate plastic product；
(7) solvent of step (5) and step (6) is merged, pure solvent orange 2 A and solvent B is obtained by separated, and from
Poisonous PBDE, tetrabromobisphenol A and HBCD are isolated in solvent.
Further to realize the purpose of the present invention, it is preferable that the mesh size of the bolter is 0.1~0.5mm.
Preferably, the solution that the heat filtering obtains, which is cooled in 0 DEG C of temperature-fall period, controls cooling rate to be less than or wait
In 10 DEG C/min.
Preferably, the rotating speed of the centrifuge separation of the step (4) is 5000~8000r/min, disengaging time 10-
20min。
Preferably, the monoalcohol solvent is in methanol, ethanol, normal propyl alcohol, isopropanol, butanol, isobutanol and amylalcohol
It is one or more.
Preferably, the extruder is the double screw extruder of devolatilization type.
In general, the solubility of TDE only has the 20~30% of deca-BDE, antimony oxide is having
The solubility of solvent is very small, it is believed that insoluble.
For the present invention using crystal curing principle, a small amount of little particle dissolution of crystals that crystallization process is formed simultaneously is transferred to big
On grain crystal, the particle diameter of decabromodiphenyl oxide particle is further improved, eliminates little particle crystal；
It is to further reduce the solubility of decabromodiphenyl oxide to add solvent B main purposes, while improves tetrabromobisphenol
A, the solubility of HBCD, avoids temperature-fall period from separating out.Decabromodiphenyl oxide precipitation process can also separate out a small amount of ten simultaneously
Bromine diphenylethane crystal, but comprising a small amount of TDE, do not interfere with the further utilization of decabromodiphenyl oxide.
Solvent orange 2 A used in the present invention is characterized in that the dicyandiamide solution can dissolve Flameproof styrenic class plastics, such as toluene, diformazan
Benzene, benzene, tetrahydrofuran, chloroform, carbon tetrachloride, dichloroethanes, dichloromethane, limonene, dipentene, butyl acetate, acetic acid second
Ester etc. may serve to the solvent as the present invention.
The solvent B that the present invention uses is characterized in can be miscible with A solvents, and solvent B should be the poor solvent of plastics, such as second
The various monohydric alcohols such as alcohol, normal propyl alcohol, isopropanol, butanol, amylalcohol or mixture can meet to require.Other solvent B boiling point should
More than 10 DEG C are differed with solvent orange 2 A, in order to which solvent is regenerated by rectifying separation.
Compared with prior art, the invention has the advantages that：
1st, the present invention is directed to different needs, except that can regenerate HIPS/PS, ABS etc. from brominated flame retardant plastics waste
Meet the plastic product that RoHS instructions require while can also isolate decabromodiphenyl oxide (containing a small amount of TDE), ten bromines
Two kinds of flame retardant products such as diphenylethane (containing antimony oxide).Although the styrene plastic obtained may gather containing bromo
Styrene, but the content of PBDE, decabromodiphenyl oxide is extremely low, can meet RoHS standards.The decabromodiphenyl oxide obtained
Although grain contains part TDE particle, it is not influenceed and is used in the range of license.The decabrominated dipheny obtained
The mixture of ethane and antimony oxide is used directly for the production of flame retardant plastics.As can be seen here, the present invention not only can be real
The regeneration of existing styrene plastic, while it is also beneficial to realize that the recycling of part brominated flame-retardant recycles.
2nd, dissolving, recrystallization and crystal curing technology of the present invention using decabromodiphenyl oxide in plastic solution, by ten
The grain diameter of bromo biphenyl ether brings up to 50~200 microns from 0.1~10 micron so that the particle separation of decabromodiphenyl oxide is more held
Easily carry out, separation is more complete.
3rd, the present invention adds a small amount of monohydric alcohol to solution using after separation TDE and antimony oxide
In, the decabromodiphenyl ether content in solution can be reduced to greatest extent, and the anti-solvent precipitation process that is advantageous to subsequently to heat up avoids again
Decabromodiphenyl oxide crystallization is separated out, ensure that regenerated plastics can meet RoHS requirements.Monohydric alcohol is added simultaneously, improves tetrabromobisphenol
A (TBBPA), HBCD (HBCD) solubility, avoid it and together separated out with decabromodiphenyl oxide.
4th, present invention utilizes TDE and the difference of the solubility of decabromodiphenyl oxide, join ten bromines by heating
Phenylate is completely dissolved, the dissolving of TDE small part, the isolated brominated flame-retardant product of different purposes.
5th, the present invention realizes the separation and utilization of antimony oxide.
Specific implementation method
To more fully understand the present invention, with reference to embodiment, the present invention is further illustrated, but embodiment is simultaneously
The limitation to the claimed scope of the invention is not formed.
Embodiment 1
Assorting room obtains size and is added to for the brominated flame retardant plastic tablet waste 1kg of 0.1~1cm in 4.5kg toluene, one
In individual 10 liters of stirred tank, stirring and dissolving 60min under normal temperature, solution is separated with bolter (aperture 0.1mm), obtained
5.10kg plastic solutions and the insoluble plastic grains of 0.40kg are with impurity.Through analysis find the HIPS containing 10.00wt% in solution,
PS plastic, 1.00wt% decabromodiphenyl oxide, 0.60wt% TDE, 0.60wt% antimony oxide,
0.20wt% HBCD, 0.12% PBDE (not including decabromodiphenyl oxide).
Plastic solution is heated to 95 DEG C, the decabromodiphenyl oxide particle in plastic solution is completely dissolved, use aperture for
0.01mm 50 grams of the isolated antimony oxide of filter screen heat filtering, TDE mixture, it is 5 to control rate of temperature fall
DEG C/min, solution is reduced by 0 DEG C, 0 DEG C is maintained at, is slowly added to 200 grams of normal propyl alcohols, continues to be aged 5 hours, using centrifugation point
Disembark, separated 10 minutes under 5000r/min, obtain plastic solution 5.2kg and 50 grams of decabromodiphenyl oxide particle (contains
18.50wt% TDE).
Solution after separation is heated to 40 DEG C, 5.5kg normal propyl alcohols is added, plastics is precipitated out, through twin-screw extrusion
Machine deviates from solvent, obtains 500 grams of regenerated plastics (HIPS and PS), (including decabromodiphenyl oxide) containing PBDE in plastics
0.07wt%, HBCD 0.13wt%, toluene 0.02wt%, normal propyl alcohol 0.05wt%, according to plastic tensile performance mark
The tensile strength that quasi- test method (GB/T1042-92) measures regenerated plastics is 27MPa, is tried according to plastics Chalpy impact standard
The notch impact strength that proved recipe method (GB/T1843-1996) measures regenerated plastics is 7.5KJ/mP227.5MPa before P, with regeneration
Tensile strength and 6.21KJ/mP2Notch impact strength approach.
Precipitation process obtains 6kg toluene and the mixture of normal propyl alcohol reclaims to obtain normal propyl alcohol and toluene by rectifying, can follow
Ring uses, and the brominated flame-retardant separated out in solvent carries out harmless treatment after collecting.
Embodiment 2
Assorting room obtains size and is added to for the brominated flame retardant plastic tablet waste 1kg of 0.1~1cm in 4.5kg limonenes,
In one 10 liters of stirred tank, stirring and dissolving 60min under normal temperature, solution is separated with bolter (aperture 0.1mm), obtained
5.10kg plastic solutions and the insoluble plastic grains of 0.40kg and impurity.Through analysis find the HIPS containing 10.00wt% in solution,
PS plastic, 1.00wt% decabromodiphenyl oxide, 0.60wt% TDE, 0.60wt% antimony oxide,
0.20wt% HBCD, 0.12% PBDE (not including decabromodiphenyl oxide).
Plastic solution is heated to 80 DEG C, the decabromodiphenyl oxide particle in plastic solution is completely dissolved, use aperture for
0.01mm 50 grams of the isolated antimony oxide of filter screen heat filtering, TDE mixture, it is 5 to control rate of temperature fall
DEG C/min, solution is reduced by 0 DEG C, 0 DEG C is maintained at, is slowly added to 200 grams of normal propyl alcohols, continues to be aged 5 hours, using centrifugation point
Disembark, separated 10 minutes under 5000r/min, obtain plastic solution 5.2kg and 50 grams of decabromodiphenyl oxide particle (contains
18.50wt% TDE).
Solution after separation is heated to 40 DEG C, 5.5kg normal propyl alcohols is added, plastics is precipitated out, through twin-screw extrusion
Machine deviates from solvent, obtains 500 grams of regenerated plastics (HIPS and PS), (including decabromodiphenyl oxide) containing PBDE in plastics
0.07wt%, HBCD 0.13wt%, limonene 0.07wt%, normal propyl alcohol 0.05wt%, according to plastic tensile performance
The tensile strength that standard test method (GB/T1042-92) measures regenerated plastics is 27MPa, according to plastics Chalpy impact standard
The notch impact strength that test method (GB/T1843-1996) measures regenerated plastics is 7.5KJ/mP227.5MPa before P, with regeneration
Tensile strength and 6.21KJ/mP2Notch impact strength approach.
Precipitation process obtains 6kg limonenes and the mixture of normal propyl alcohol obtains normal propyl alcohol and toluene by rectifying, is recycled
Use, the brominated flame-retardant separated out in solvent carries out harmless treatment after collecting.
Embodiment 3
Example 1 takes brominated flame-proof ABS plastics 1kg to be added in 4.5kg butanone, in one 10 liters of stirred tank, under normal temperature
Stirring and dissolving 60min, solution is separated with bolter (aperture 0.1mm), 5.00kg plastic solutions is obtained and 0.50kg is insoluble
Property plastic grain and impurity.Through analysis find the ABS plastic containing 10.00wt% in solution, 0.70wt% tetrabromobisphenol A,
0.30wt% decabromodiphenyl oxide, 0.60wt% antimony oxide, 0.60wt% TDE, 0.12% more bromines
Biphenyl Ether (not including decabromodiphenyl oxide).
Plastic solution is heated to 60 DEG C, the decabromodiphenyl oxide particle in plastic solution is completely dissolved, use aperture for
0.01mm 55 grams of the isolated antimony oxide of filter screen heat filtering, TDE mixture, it is 5 to control rate of temperature fall
DEG C/min, solution is reduced to 0 DEG C, 220 grams of methanol is slowly added to and solution temperature is maintained at 0 DEG C, it is 5 small to continue ageing
When, using centrifugal separator, separated 10 minutes under 5000r/min, obtain plastic solution 5.2kg and decabromodiphenyl oxide particle 25
Gram (TDE containing 9.00wt%).
Solution after separation is heated to 40 DEG C, 5.5kg methanol is added, plastics is precipitated out, through double screw extruder
Deviate from solvent, obtain 500 grams of regenerated plastics (ABS), containing PBDE (including decabromodiphenyl oxide) 0.08wt%, four in plastics
Bromine bisphenol-A 0.14%, butanone 0.03wt%, methanol 0.04wt%, the tensile strength of regenerated plastics sample are 44.34MPa, breach
Impact strength is 15.31KJ/mP245.5MPa tensile strength and 14.61KJ/mP before P, with regeneration2Notch impact strength connect
Closely.
Precipitation process obtains 6kg butanone and the mixture of methanol regenerates pure butanone and methanol by rectifying, is recycled
Use.
The present invention is directed to different needs, except that can regenerate the symbol such as HIPS/PS, ABS from brominated flame retardant plastics waste
Close the plastic product that RoHS instructions require while can also isolate decabromodiphenyl oxide (containing a small amount of TDE), ten bromines two
Two kinds of flame retardant products such as vinylbenzene (containing antimony oxide).Although the styrene plastic obtained may contain bromo polyphenyl
Ethene, but the content of PBDE, decabromodiphenyl oxide is extremely low, can meet RoHS standards.The decabromodiphenyl oxide particle obtained
Although containing part TDE particle, it is not influenceed and is used in the range of license.The decabrominated dipheny second obtained
The mixture of alkane and antimony oxide is used directly for the production of flame retardant plastics.As can be seen here, the present invention can not only realize
The regeneration of styrene plastic, while it is also beneficial to realize that the recycling of part brominated flame-retardant recycles.
Claims (6)
1. separation and the regeneration method of a kind of brominated Flameproof styrenic class plastics, it is characterised in that comprise the following steps：
(1) waste and old brominated Flameproof styrenic class plastics are added in solvent orange 2 A, it is 10 to control plastic quality percentage composition in solution
~20%, solvent orange 2 A dissolves the styrene plastic of brominated Flameproof styrenic class plastics, other plastics, part fire retardant and impurity
It is insoluble；Described solvent orange 2 A is toluene, dimethylbenzene, butanone, propiophenone, cyclohexanone, methyl isoamyl ketone, limonene, tetrahydrochysene furan
Mutter, the one or more of butyl acetate and ethyl acetate；
(2) plastic solution after dissolving sifts out undissolved insoluble plastics and impurity, undissolved fire retardant by bolter
Grain continues to stay in the solution；
(3) plastic solution obtained in step (2) is heated, until decabromodiphenyl oxide is completely dissolved, three is removed using heat filtering
Aoxidize two antimony, TDE particulate matter；
(4) solution that step (3) heat filtering obtains is cooled to 0 DEG C；Add the molten of the solution quality 1~10% that heat filtering obtains
Agent B；Solution is aged 5-10 hours at 0 DEG C again；By a small amount of little particle dissolution of crystals of crystallization process formation and it is transferred to big
On granule crystal, the particle diameter of decabromodiphenyl oxide particle is improved, eliminates little particle crystal；Separated with centrifuge, obtain decabromodiphenyl
Ether particle；Decabromodiphenyl oxide particle is cleaned, it is broken after use again；The solvent B is monoalcohol solvent；
(5) step (4) is separated to the solution after decabromodiphenyl oxide particle and is warming up to 20~50 DEG C, is added equivalent to plastic solution matter
The solvent B of amount 100~200%, by plastics Precipitation, and PBDE, tetrabromobisphenol A, HBCD can stay in
In solution, the separation of plastics and poisonous fire retardant is realized；
(6) the plastics sediment feeding extruder obtained step (5), deviates from sediment to remain molten at 180-220 DEG C
Agent, acquisition regenerate plastic product；
(7) solvent of step (5) and step (6) is merged, pure solvent orange 2 A and solvent B is obtained by separated, and from solvent
In isolate poisonous PBDE, tetrabromobisphenol A and HBCD.
2. separation and the regeneration method of brominated Flameproof styrenic class plastics according to claim 1, it is characterised in that：Institute
The mesh size for stating bolter is 0.1~0.5mm.
3. separation and the regeneration method of brominated Flameproof styrenic class plastics according to claim 1, it is characterised in that：Institute
State the solution that heat filtering obtains and cool to control cooling rate in 0 DEG C of temperature-fall period and be less than or equal to 10 DEG C/min.
4. separation and the regeneration method of brominated Flameproof styrenic class plastics according to claim 1, it is characterised in that：Institute
The rotating speed for stating the centrifuge separation of step (4) is 5000~8000r/min, disengaging time 10-20min.
5. separation and the regeneration method of brominated Flameproof styrenic class plastics according to claim 1, it is characterised in that：Institute
Monoalcohol solvent is stated as the one or more in methanol, ethanol, normal propyl alcohol, isopropanol, butanol, isobutanol and amylalcohol.
6. separation and the regeneration method of brominated Flameproof styrenic class plastics according to claim 1, it is characterised in that：Institute
State the double screw extruder that extruder is devolatilization type.
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| CN201510752785.2A CN105237799B (en) | 2015-11-05 | 2015-11-05 | The renovation process of waste or used plastics containing PBBs and PBDE |
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| US20230383088A1 (en) | 2020-10-19 | 2023-11-30 | Ineos Styrolution Group Gmbh | Method for depolymerizing polymer masses while degrading organic halogen compounds |
| CN115228905B (en) * | 2022-07-18 | 2024-02-20 | 中国科学院过程工程研究所 | Method for treating nonmetallic materials in waste circuit boards |
| CN115368627B (en) * | 2022-10-26 | 2023-01-24 | 国高材高分子材料产业创新中心有限公司 | Method for recovering flame-retardant polyester |
Citations (3)
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|---|---|---|---|---|
| CN101531566A (en) * | 2009-04-03 | 2009-09-16 | 泰州百力化学有限公司 | Method for purifying decabromodiphenylethane |
| CN102050958A (en) * | 2010-11-18 | 2011-05-11 | 广东石油化工学院 | Method for recycling waste plastics containing polybrominated diphenyls and polybrominated diphenyl ethers |
| CN104788645A (en) * | 2015-04-01 | 2015-07-22 | 南通星辰合成材料有限公司 | Method for purifying high-molecular-weight brominated epoxy fire retardant through solution crystallization process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040229965A1 (en) * | 2000-08-11 | 2004-11-18 | Andreas Maurer | Method for separating and recovering target polymers and their additives from a material containing polymers |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101531566A (en) * | 2009-04-03 | 2009-09-16 | 泰州百力化学有限公司 | Method for purifying decabromodiphenylethane |
| CN102050958A (en) * | 2010-11-18 | 2011-05-11 | 广东石油化工学院 | Method for recycling waste plastics containing polybrominated diphenyls and polybrominated diphenyl ethers |
| CN104788645A (en) * | 2015-04-01 | 2015-07-22 | 南通星辰合成材料有限公司 | Method for purifying high-molecular-weight brominated epoxy fire retardant through solution crystallization process |
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