CN102617267A - Method for depolymerizing waste polystyrene and recovering monomer - Google Patents
Method for depolymerizing waste polystyrene and recovering monomer Download PDFInfo
- Publication number
- CN102617267A CN102617267A CN2012100658888A CN201210065888A CN102617267A CN 102617267 A CN102617267 A CN 102617267A CN 2012100658888 A CN2012100658888 A CN 2012100658888A CN 201210065888 A CN201210065888 A CN 201210065888A CN 102617267 A CN102617267 A CN 102617267A
- Authority
- CN
- China
- Prior art keywords
- polystyrene foamed
- foamed plastics
- waste polystyrene
- waste
- catalyzer
- 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
Landscapes
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a method for depolymerizing waste polystyrene and recovering monomer. The method comprises the steps of preparing a catalyst, pretreating waste polystyrene foamed plastic and catalyzing and depolymerizing the waste polystyrene foamed plastic; and coal ash is used as the catalyst, has a catalytic effect, is low in price and can be obtained easily; the yield of monomer is high; the problems about recycling and regeneration of the polystyrene foamed plastic is effectively solved; and an important function of improving environment is exerted. The method is simple and practical, low in cost, convenient to operate, and easy to popularize, and has certain economic value and social value.
Description
Technical field
The present invention relates to a kind of method of discarded Chemicals regenerated using, relate in particular to a kind of by waste and old polystyrol depolymerization recovery monomer methods.Be applied to technical fields such as environmental protection, packing.
Background technology
Polystyrene foamed plastics has been widely used in every field such as building, chemical industry, environmental protection, packing; Closely bound up with people's life; But, cause white pollution easily, so its efficient recovery is an important problem because polystyrene foamed plastics is difficult for degraded.At present, p-poly-phenyl vinylic foam cycling and reutilization is a very important channel, and the protection environment is extremely important.It is main product liquid that waste polystyrene foam plastic can depolymerize to vinylbenzene, and other also have benzene, toluene, ethylbenzene and cinnamic oligomer etc.But the catalyst system therefor of polystyrene foamed plastics recovery at present mostly costs an arm and a leg, and poison easily during use, and the recovery yield of monomer of depolymerization PS is generally on the low side.
Summary of the invention
The present invention is directed to the problem that exists in the above-mentioned prior art; Through developing meticulously and doing painstaking research, providing a kind of is the method for catalyzer thermal depolymerization styrofoam with flyash, catalyzer cheap; Effect is obvious; And solved the general problem of lower of recovery yield of monomer of depolymerization PS in the prior art, realized that waste polystyrene foamed plastics is carried out depolymerization to be reclaimed, the monomer styrene yield is more than 65%.
The technical scheme of technical solution problem of the present invention comprises the steps:
(1) controlling catalyst: the new flyash of collecting of choosing, in the constant temperature vacuum drying oven, dry activation treatment, drying time at least 2 hours, 200 ℃ ~ 300 ℃ of bake out temperatures promptly make catalyzer;
(2) pre-treatment of waste polystyrene foamed plastics: waste polystyrene foamed plastics is cleaned, and Air drying is for use then;
(3) catalytic degradation of waste polystyrene foamed plastics: raw materials by weight is prepared from: waste polystyrene foamed plastics 75～95%; Catalyzer 5 ~ 25% adds waste polystyrene foamed plastics in the reactor drum earlier by formulation ratio, adds catalyzer again; Under nitrogen protection; With well heater described reactor drum is heated to 340 ℃ ~ 370 ℃ and carries out rectifying separation, promptly get product vinylbenzene, recovery yield of monomer is more than 65%.
Described step (3) needs fully to stir after adding catalyzer.
Advantageous effect of the present invention is following: the present invention selects for use flyash to make catalyzer, because flyash light weight, specific surface are big, its main chemical compositions is SiO
2, Al
2O
3, Fe
2O
3, CaO and unburnt activated carbon grain, catalytic effect is obvious, and cheap, be easy to get, recovery yield of monomer is higher, has solved the recovery and the regenerated using problem of polystyrene foamed plastics effectively, plays an important role for improving environment.
The invention solves in the prior art, those skilled in the art thirst for the technical barrier that solves always, and process method of the present invention is simple and practical, and cost is low, and is easy to operate, are easy to promote, and have certain economic and are worth and social value.
Embodiment
Below in conjunction with specific embodiment the present invention is further elaborated, but protection scope of the present invention is not limited by concrete embodiment, is as the criterion with claims.In addition, with under the prerequisite of technical scheme of the present invention, any change or change that those of ordinary skills that the present invention did are realized easily all will fall within the claim scope of the present invention.
Embodiment 1
A kind of by waste and old polystyrol depolymerization recovery monomer methods, comprise the steps:
(1) controlling catalyst: collecting the flying dust that obtains after adopting heat power plant's discharged flue gas to handle through gathering dust is flyash; The new flyash of collecting of choosing is dried activation treatment, drying time 3 hours in the constant temperature vacuum drying oven; 210 ℃ of bake out temperatures promptly make catalyzer;
(2) pre-treatment of waste polystyrene foamed plastics: waste polystyrene foamed plastics is cleaned, and Air drying is for use then;
(3) catalytic degradation of waste polystyrene foamed plastics: get waste polystyrene foamed plastics 95% by formulation ratio; Catalyzer 5% adds waste polystyrene foamed plastics in the reactor drum earlier, fully stirs after adding catalyzer again; Under nitrogen protection; With well heater described reactor drum is heated to 370 ℃ and carries out rectifying separation, show that its staple is a monomer styrene, recovery yield of monomer 65% through analyzing.
Embodiment 2
A kind of by waste and old polystyrol depolymerization recovery monomer methods, comprise the steps:
(1) controlling catalyst: collecting the flying dust that obtains after adopting heat power plant's discharged flue gas to handle through gathering dust is flyash; The new flyash of collecting of choosing is dried activation treatment, drying time 2.5 hours in the constant temperature vacuum drying oven; 230 ℃ of bake out temperatures promptly make catalyzer;
(2) pre-treatment of waste polystyrene foamed plastics: waste polystyrene foamed plastics is cleaned, and Air drying is for use then;
(3) catalytic degradation of waste polystyrene foamed plastics: get waste polystyrene foamed plastics 90% by formulation ratio; Catalyzer 10% adds waste polystyrene foamed plastics in the reactor drum earlier, fully stirs after adding catalyzer again; Under nitrogen protection; With well heater described reactor drum is heated to 360 ℃ and carries out rectifying separation, show that its staple is a monomer styrene, recovery yield of monomer 66% through analyzing.
Embodiment 3
A kind of by waste and old polystyrol depolymerization recovery monomer methods, comprise the steps:
(1) controlling catalyst: collecting the flying dust that obtains after adopting heat power plant's discharged flue gas to handle through gathering dust is flyash; The new flyash of collecting of choosing is dried activation treatment, drying time 2 hours in the constant temperature vacuum drying oven; 250 ℃ of bake out temperatures promptly make catalyzer;
(2) pre-treatment of waste polystyrene foamed plastics: waste polystyrene foamed plastics is cleaned, and Air drying is for use then;
(3) catalytic degradation of waste polystyrene foamed plastics: get waste polystyrene foamed plastics 85% by formulation ratio; Catalyzer 15% adds waste polystyrene foamed plastics in the reactor drum earlier, fully stirs after adding catalyzer again; Under nitrogen protection; With well heater described reactor drum is heated to 350 ℃ and carries out rectifying separation, show that its staple is a monomer styrene, recovery yield of monomer 66% through analyzing.
Embodiment 4
A kind of by waste and old polystyrol depolymerization recovery monomer methods, comprise the steps:
(1) controlling catalyst: collecting the flying dust that obtains after adopting heat power plant's discharged flue gas to handle through gathering dust is flyash; The new flyash of collecting of choosing is dried activation treatment, drying time 4 hours in the constant temperature vacuum drying oven; 270 ℃ of bake out temperatures promptly make catalyzer;
(2) pre-treatment of waste polystyrene foamed plastics: waste polystyrene foamed plastics is cleaned, and Air drying is for use then;
(3) catalytic degradation of waste polystyrene foamed plastics: get waste polystyrene foamed plastics 80% by formulation ratio; Catalyzer 20% adds waste polystyrene foamed plastics in the reactor drum earlier, fully stirs after adding catalyzer again; Under nitrogen protection; With well heater described reactor drum is heated to 345 ℃ and carries out rectifying separation, show that its staple is a monomer styrene, recovery yield of monomer 68% through analyzing.
Embodiment 5
A kind of by waste and old polystyrol depolymerization recovery monomer methods, comprise the steps:
(1) controlling catalyst: collecting the flying dust that obtains after adopting heat power plant's discharged flue gas to handle through gathering dust is flyash; The new flyash of collecting of choosing is dried activation treatment, drying time 3 hours in the constant temperature vacuum drying oven; 300 ℃ of bake out temperatures promptly make catalyzer;
(2) pre-treatment of waste polystyrene foamed plastics: waste polystyrene foamed plastics is cleaned, and Air drying is for use then;
(3) catalytic degradation of waste polystyrene foamed plastics: get waste polystyrene foamed plastics 75% by formulation ratio; Catalyzer 25% adds waste polystyrene foamed plastics in the reactor drum earlier, fully stirs after adding catalyzer again; Under nitrogen protection; With well heater described reactor drum is heated to 340 ℃ and carries out rectifying separation, show that its staple is a monomer styrene, recovery yield of monomer 70% through analyzing.
Claims (2)
1. one kind is reclaimed monomer methods by the waste and old polystyrol depolymerization, it is characterized in that comprising the steps:
(1) controlling catalyst: the new flyash of collecting of choosing, in the constant temperature vacuum drying oven, dry activation treatment, drying time at least 2 hours, 200 ℃ ~ 300 ℃ of bake out temperatures promptly make catalyzer;
(2) pre-treatment of waste polystyrene foamed plastics: waste polystyrene foamed plastics is cleaned, and Air drying is for use then;
(3) catalytic degradation of waste polystyrene foamed plastics: raw materials by weight is prepared from: waste polystyrene foamed plastics 75～95%; Catalyzer 5 ~ 25% adds waste polystyrene foamed plastics in the reactor drum earlier by formulation ratio, adds catalyzer again; Under nitrogen protection; With well heater described reactor drum is heated to 340 ℃ ~ 370 ℃ and carries out rectifying separation, promptly get product vinylbenzene, yield is more than 65%.
2. according to claim 1 a kind of by waste and old polystyrol depolymerization recovery monomer methods, it is characterized in that needing fully to stir after described step (3) adds catalyzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100658888A CN102617267A (en) | 2012-03-14 | 2012-03-14 | Method for depolymerizing waste polystyrene and recovering monomer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100658888A CN102617267A (en) | 2012-03-14 | 2012-03-14 | Method for depolymerizing waste polystyrene and recovering monomer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102617267A true CN102617267A (en) | 2012-08-01 |
Family
ID=46557540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100658888A Pending CN102617267A (en) | 2012-03-14 | 2012-03-14 | Method for depolymerizing waste polystyrene and recovering monomer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102617267A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1488612A (en) * | 2003-08-07 | 2004-04-14 | 徐志刚 | Tube cracking reactor for preparing ethyl benzene by catalytic cracking of waste polystyrene |
| CN101024776A (en) * | 2007-03-26 | 2007-08-29 | 湖南师范大学 | Catalyst for catalytic cracking waste-plastic made fuel oil |
| CN101891581A (en) * | 2010-06-15 | 2010-11-24 | 青岛科技大学 | Method for recovering styrene and other aromatic hydrocarbon raw materials by catalyzing and cracking waste polystyrene |
-
2012
- 2012-03-14 CN CN2012100658888A patent/CN102617267A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1488612A (en) * | 2003-08-07 | 2004-04-14 | 徐志刚 | Tube cracking reactor for preparing ethyl benzene by catalytic cracking of waste polystyrene |
| CN101024776A (en) * | 2007-03-26 | 2007-08-29 | 湖南师范大学 | Catalyst for catalytic cracking waste-plastic made fuel oil |
| CN101891581A (en) * | 2010-06-15 | 2010-11-24 | 青岛科技大学 | Method for recovering styrene and other aromatic hydrocarbon raw materials by catalyzing and cracking waste polystyrene |
Non-Patent Citations (2)
| Title |
|---|
| 刘焕志等: "粉煤灰催化热裂解聚丙烯废塑料", 《化工环保》 * |
| 宋学君等: "煤渣催化聚苯乙烯泡沫塑料热解的研究", 《中国塑料》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Das et al. | Thermal degradation study of waste polyethylene terephthalate (PET) under inert and oxidative environments | |
| Huang et al. | (Co-) pyrolytic performances and by-products of textile dyeing sludge and spent mushroom substrate | |
| KR20120012810A (en) | Chemical recycling of pla by hydrolysis | |
| CN102101013B (en) | Method for preparing desulfurization denitration agent, methanol and acetone by biomass pyrolysis | |
| CN106635079A (en) | Solid waste RDF treating method | |
| CN104479717A (en) | Method used for improving bio oil quality via co-catalysis of waste polyolefin plastic with biomass | |
| CN103626796A (en) | Recovery method of silicone rubber | |
| CN105935581A (en) | Inorganic acid catalysis hydrothermal method for preparation of bamboo biochar | |
| CN102757803B (en) | Steam low-temperature carbonization system and method of waste tire fluidized bed | |
| CN102936511A (en) | Method for producing high-grade bio-oil through on-line catalytic cracking of biomass flash pyrolysis product | |
| CN101811048A (en) | Method for preparing Fe/C-supported catalyst from waste biomass | |
| CN111057569A (en) | Waste plastic recycling method | |
| CN102617267A (en) | Method for depolymerizing waste polystyrene and recovering monomer | |
| CN103086824B (en) | Light olefin production method and cracking system | |
| CN103539214B (en) | Method for treating organic wastewater generated in preparing ethylene through ethanol dehydration | |
| CN103420752B (en) | Separation refinement method for ethylene preparation through biomass ethanol dehydration | |
| CN214681676U (en) | Two-stage microwave tandem catalytic pyrolysis device for waste grease | |
| Ma et al. | Evaluation and comparison of aqueous ChCl/Urea and other physical absorbents for biogas upgrading process | |
| Lee et al. | Hybridization of the thermo-chemical process of polyvinyl chloride in the production of bioethanol using horse hay | |
| Takuma et al. | A Novel Technology for Chemical Recycling of Low-Density Polyethylene by Selective Degradation into Lower Olefins Using H-Borosilicate as a Catalyst. | |
| CN1762599A (en) | Regeneration method of catalyst for synthesizing propylene (ethylene) carbonate from urea and propylene (ethylene) glycol | |
| CN103484171A (en) | Method used for removing vapour in pyrolysis raw gas, and fixed bed pyrolysis device | |
| CN103467237B (en) | Terephthalic acid residue catalytic decarboxylation prepares the method for aromatic hydrocarbons | |
| CN202754955U (en) | Steam low-temperature carbonization system of waste tire fluidized bed | |
| CN106520174A (en) | Method for preparing aromatic hydrocarbons through catalytically pyrolyzing waste polyolefin plastics |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120801 |