KR20030069008A - Waste polystyrene disposal process and disposal device - Google Patents

Abstract

PURPOSE: A treatment method for recycling the foam polystyrene waste and its apparatus are provided, to recycle the foam polystyrene waste massively by employing a specific organic solvent for reducing the secondary environmental pollution due to the treatment of the foam polystyrene waste. CONSTITUTION: The method comprises the step of dissolving the foam polystyrene waste in a solvent mixture comprising a specific organic solvent which dissolves foam polystyrene and is selected from an aliphatic hydrocarbon and an alcohol of low molecular weight which does not dissolve foam polystyrene and has one to four carbons. Preferably the organic solvent is selected from the group consisting of dimethylamine, diisopropylamine, trimethylamine, N-propylamine, ethylene glycol monomethylether, ethylene glycol monoethylene ether, dichloropropane, polyethylene glycol alkylether, methylethyl ketone and trichloro isopropanol.

Description

Waste treatment method and apparatus for recycling polystyrene waste {WASTE POLYSTYRENE DISPOSAL PROCESS AND DISPOSAL DEVICE}

The present invention relates to a method for treating and treating bulky expanded polystyrene waste, and more particularly, to an organic solvent of a halogen-based or aliphatic hydrocarbon compound and a lower alcohol having 1 to 4 carbon atoms. By degassing and reducing the expanded polystyrene using a reducing solution containing these solutions as a main component, the dissolution treatment ability can be improved.

In recent years, according to the development of polymer chemistry and industrial technology, polystyrene resin (POLYSTYRENE RESINS), which is one of general purpose plastics, has many uses, but the foam of the resin, namely, foamed polystyrene has been used for industrial purposes because of its excellent buffering property, insulation and moldability. It is widely used in packaging materials such as products, household goods and foods, and the amount of processing after use is also increasing.

After use, the expanded polystyrene is bulky and not easy to dispose of.They are treated by incineration or landfilling for marine farm parts and shellfish storage containers that are not recyclable due to various substances and salts. In many cases, the gas is generated and the transportation cost caused by the cleaning vehicle or the like is excessive.

As a result, the recovery, recycling, pyrolysis, and acquisition of liquefied components by testing the reuse of foamed polystyrene waste after use are referred to as practical methods. In these methods, however, the volume decreases due to pyrolysis or the like, but it is impossible to return the original white foamed polystyrene due to the change of properties due to heat.

Therefore, in recent years, attention has been paid to a method for treating expanded polystyrene wastes by the liquefaction reduction method, which is thought to have relatively low deterioration in physical and chemical properties. Recently, the most commonly used solvent for dissolving expanded polystyrene waste is d-limonene, a citrus plant essential oil. d-limonene has a very low flash point of 48 degrees and is concerned with the solubility of expanded polystyrene. Therefore, this has a problem in the working environment, such as a strong citrus flavor, and has a difficult point such as lack of stability when decomposed in the point of natural products.

In addition, aromatic hydrocarbons, such as toluene and benzene, may be treated with a solvent such as trichloroethylene, perchloroethylene, and methylene chloride.However, when exposed, harmful gases may cause flammability, toxicity, and carcinogenicity. Therefore, there is a problem that causes risks and environmental pollution.

The present invention is to provide a method for defoaming shrinkage of expanded polystyrene using liquefaction for easy transport and separation recovery by shrinking its volume, rather than completely dissolving the expanded polystyrene waste in order to solve the above problems.

Another object of the present invention is to provide a method for recycling foamed polystyrene wastes using a solvent that is not environmentally friendly and does not have a risk of flammability and explosion by not containing volatile organic substances.

In order to achieve the above method, the present invention provides a treatment apparatus that can smoothly process the foamed polystyrene waste and farm waste in construction sites, which has been difficult to treat due to the separation of this material.

1 is a device diagram according to an embodiment of the present invention;

2 is a device diagram according to an embodiment of the present invention;

Explanation of symbols for main parts of the drawings

1: expanded polystyrene waste

2: shredder

3: input conveyor

4: stirring tank

4-1: Polystyrene Gel

5: stirring blade

6: reducing agent

6-1: Solvent Supply Container

7: gel outlet

8: vehicle

9: hopper

10: dryer

10 ': Dry drum

11: polystyrene ingot

12: reducing agent recovery machine

13: condenser

14: heater

15: motor

16: blade

According to the present invention, the method for reducing the foaming polystyrene, that is, the recycling treatment method is a solution and a precipitation agent for dissolving expanded polystyrene extracted from a compound consisting of a halogen-based and aliphatic hydrocarbon compound. It is a method characterized by dissolving a foaming material by mixing alone or 2 or more types of lower alcohols which do not dissolve phosphorus expanded polystyrene.

Dimethylamine, diisopropylamine, trimethylamine, N-propylamine, dichloropropane, methyl chloride, methyl ethyl ketone, trichloroethylene, which are halogenated and aliphatic hydrocarbon compounds What mixed selectively the solvent which consists of trichloro isopropanol, etc. can be used.

Also, as a calcifier, metalol, butanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, iso-butanol, n-amiralcohol, tert-amiralcohol or sec-hexa It is possible to use sole solvents alone or in combination of two or more thereof or to selectively mix them.

In addition, the present invention, after crushing the waste styrofoam in the form of a fixed or amorphous form in the above-described solvent, infiltrated into the solvent to reduce the gel (gel) by maximizing the volume (1/50 to 1/100) The present invention relates to a treatment method that can be recycled by transporting (drying) and drying it.

In addition, the present applicant did not have sufficient solubility in polystyrene-based organic materials, but it was noted that the organic solvent having a solubility parameter close thereto facilitates plasticization by the reduction of polystyrene-based organic materials, in particular polystyrene foam. . In other words, dichloropropane, an aliphatic hydrocarbon compound having high affinity with organic polymers and penetrating into the molecule to expand the polymer chain, and shrinking and agglomeration of the polymer chain with low affinity with the polymer and penetrating into the molecule. Although it does not dissolve about a polystyrene organic substance by mixing lower alcohols with 1-4 carbon atoms, it demonstrated that the substance can be gelatinized or plasticized.

In other words, the polystyrene foam according to the present invention is a mixture of organic solvent having a specific gravity of 1 or more and lower alcohols having a specific gravity of less than 1 in a volume ratio of 65:45 to set the solubility parameter in the mixed state to a value close to 10.1.

By adding a predetermined amount of the reducing agent to the stirring vessel 4 and then stirring the waste foamed polystyrene together, bubbles are collapsed in the expanded polystyrene and gelation or plasticization of the reduced polystyrene is possible. Applicant was able to find a solvent that can reduce the defoaming of polystyrene when a variety of halogen-based, aliphatic hydrocarbon compounds and calcifiers were selectively mixed with lower alcohols through experiments to produce a reducing agent.

Furthermore, the present inventors have experimented on the process of promoting the infiltration and separation of polystyrene foam as a solvent having a specific gravity greater than 1 and a solvent having a specific gravity less than 1, alone or in combination of two or more. Confirmed.

Next, embodiment of the processing method and processing apparatus which process a polystyrene foam material using the reducing agent of the polystyrene foam material produced | generated as mentioned above is demonstrated based on drawing.

Example

1 relates to an onboard processing apparatus.

When the processing apparatus installed in the vehicle 8 removes the string or various attachments from the foamed polystyrene waste 1, and puts it in the shredder 2, the bulky foamed polystyrene waste 1 is shredded in the form of a fixed or irregular shape and is within 50 mm. It enters into the input conveyor 3 in size. The inlet conveyor 3 is inclined in order to efficiently transport it to the cramped space of the vehicle 8 and to prevent the gas generated in the stirring vessel 4 from leaking.

When the pieces of foamed polystyrene waste (1) conveyed by the input conveyor (3) are introduced into the stirring vessel (4), the volume is 1/50 to 1/100 while infiltrating the solvent (6) by the stirring blade (5). It is reduced and reduced in size to gel (4-1).

When the volume of the agitator tank 4 is raised, the work is stopped and transported to the factory. This vehicle (8) is attached to the engine power take-off device (PTO) is a very economical because you can get all the power by the hydraulic mechanism if the engine is turned on without a separate power source.

In the vehicle 8 transported to the factory, the polystyrene gel 4-1 applied to the gel outlet 7 is extracted and separated from the dryer 10 of FIG. 2 by the reducing agent 6 and the polystyrene ingot 11. The reducing agent 6 is reused, and the polystyrene ingot 11 is supplied to an emulsifier and recycled.

FIG. 2 relates to a drying apparatus that separates the reducing agent 6 and the polystyrene ingot 11, wherein the polystyrene gel 4-1 extracted from the vehicle 8 through the gel outlet 7 is transferred to the gel inlet hopper 9. When the heater 14 in the dryer 10 is supplied and the drum surface temperature is set to 90 ° C., the drying drum 10 ′ is rotated with the driving motor 15. The polystyrene ingot adhered to the surface of the drying drum 10 ′. 11 is peeled off by the blade 16 and falls down, and the solvent gas evaporated upward is liquefied while passing through the condenser 13 and stored in the solvent recovery device 12. The recovered solvent (6) can be reused to reduce the processing cost, the polystyrene ingot 11 is collected and sent to the recycling process to be 100% recycled.

According to the present invention, the method for liquefying expanded polystyrene waste is to use a specific organic solvent as a dissolving solvent, which is chemically stable and does not generate harmful gas as compared to the conventional method using d-limonene. Since the expanded polystyrene can be easily and stably dissolved and reduced in solvent, the cost is lower than that of d-limonene, and the running cost is reduced.

In addition, since it is not flammable and explosive, anyone can use it safely, and it can be easily handled at the site where it is left and incinerated.

As a result, we aim to solve social problems by reducing waste disposal sites, reducing traffic caused by waste transportation, and reducing harmful gases (dioxin, environmental hormones, etc.) generated during incineration.

In addition, the recycling method of the expanded polystyrene waste according to the present invention is to add the lower alcohols as a precipitation agent to the solution of the expanded polystyrene waste dissolved in the solvent, so that the polystyrene can be easily separated from the dissolved solution, so that polystyrene is easily obtained as a result. It is possible to treat and recycle expanded polystyrene wastes and farm wastes that are not currently being processed, and it is easy to recycle fish and shellfish and packaging containers, leading to the effective utilization of petrochemical resources.

In addition, the device is simple and easy to disseminate, capable of mass processing, requires no power, and does not deplete the natural world through the use of regeneration.

Claims (5)

In order to defoaming and shrink the volume of the expanded polystyrene waste, the organic solvent dissolving the expanded polystyrene extracted from the group consisting of halogen-based and aliphatic hydrocarbon compounds and the lower alcohol which does not dissolve the expanded polystyrene having 1 to 4 carbon atoms alone Or selectively mixing two or more to dissolve the foam material. The method of claim 1, Organic solvents are halogen-based, aliphatic hydrocarbon compounds such as dimethylamine, diisopropylamine, trimethylamine, N-propylamine, ethylene glycol mono methyl ether, ethylene glycol mono ethylene ether, dichloropropane, polyethylene glycol alkyl ether, A process for recycling waste polystyrene wastes, characterized in that methyl ethyl ketone and trichloro isopropanol are selectively used. The method of claim 1, Dissolved polystyrenes containing 1 to 4 carbon atoms, such as methanol, butanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, n-amiralcohol, tert-amiralcohol or sec-hexanol Process for recycling the expanded polystyrene waste, characterized in that it is used alone or two or more of lower alcohols that do not. A mixing vessel (6-1) in which a stirring vessel (4) and a crusher (2) having a gel outlet (7) and a crusher (2) are installed in the vehicle (8) and connected to the feeding conveyor (3), and the reducing agent (6) is introduced. And degassing and shrinking the volume of the expanded polystyrene waste by connecting the stirring tank (4), The polystyrene gel 4-1 applied to the gel outlet 7 was introduced into the hopper 9 of the dryer 10, and the drying agent (10 ') heater 14 of the dryer 10 was used as a reducing agent ( 6) and the polystyrene ingot (11) separated by the polystyrene waste recycling apparatus characterized in that the gas can be recovered by liquefying by the condenser (13). The method of claim 4, wherein A foamed polystyrene waste recycling apparatus comprising a processing device mounted on a vehicle and an engine power take-off device installed to drive crushing, conveying, and agitation by a hydraulic motor to which a hydraulic mechanism is applied.