JP4105946B2 - Waste foaming synthetic resin recycling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recycling system for recycling waste synthetic resin products, and more particularly, to a recycling system for recovering both a styrene synthetic resin and a solvent by dissolving the styrene resin product in an organic solvent.
[0002]
[Prior art]
As methods for recovering and recycling used synthetic resins such as polystyrene foam, methods of reusing synthetic resin by heat and methods of recovering synthetic resin by dissolving synthetic resin in a solvent are being studied. .
[0003]
By the way, in the above-mentioned former method, since the resin is denatured by heating, a high-quality recycled resin cannot be obtained. In the latter method, generally used solvent is not recovered, so that the running cost is high and the working environment is bad due to evaporation of the solvent.
For example, conventionally, as a method for reclaiming waste foamed polystyrene, a solvent volume reduction method is known in which a solvent is used, dissolved in a solvent, separated and regenerated, and recycled as a raw material (for example, Patent Document 1). , See Patent Document 2).
Further, an improved recycling method for plastic waste made of styrene synthetic resin is also disclosed (see, for example, Patent Document 3).
[0004]
[Patent Document 1]
JP-A-7-26057 [Patent Document 2]
JP-A-7-62137 [Patent Document 3]
Japanese Patent No. 2819209 [0005]
[Problems to be solved by the invention]
However, the conventional solvent volume reduction method has the following disadvantages.
(1) Solvents are chlorinated hydrocarbons that are toxic and prohibited to be used as environmental pollutants.
(2) Since the dissolution rate is slow, it lacks practicality.
(3) The main component of the solvent is problematic in terms of safety such as ignition and ignition.
(4) Water-sealing treatment of the solvent is not performed.
(5) A filtering means for removing impurities is necessary.
Therefore, the present invention has been proposed to solve the above-mentioned problems, and its purpose is to provide a specific dissolution treatment configuration, so that the dissolution rate is fast and the working environment is not deteriorated by the solvent. By using special means of transportation, recovery efficiency can be improved, and high-quality recycled materials and recycled products can be provided. In addition, the plant configuration is compact, the overall running cost is low, and the working environment is low. It is to provide a good recycling system for waste foamed synthetic resin.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the recycling system for waste foamed synthetic resin according to the present invention is a dissolution tank in which a solvent is sealed with water and charged, and the foamed synthetic resin is poured into the water-sealed solvent and dissolved. And a heating / separation device for separating the mixed solution dissolved in the dissolution tank into a resin component and a solvent component, a solvent liquid tank for collecting and storing the separated solvent, and solidifying the separated resin component. Consisting of solidification equipment,
Dissolved foamed synthetic resin mixed solution dissolved in the solvent in the dissolution tank is heated and separated with a heat separator to separate the resin and solvent, and the separated solvent is stored in a solvent tank and reused. And a waste foaming synthetic resin recycling system for solidifying and reusing the separated resin in a solidifying device,
The solvent is a waste foam polystyrene synthetic resin solvent comprising 60% normal propyl bromide, 35% propylene carbonate, 5% stabilizer and the like,
This solvent is placed in the dissolution tank and is sealed with an upper water sealing layer as a lower layer. The dissolution tank is provided with a supply means for waste foam synthetic resin for guiding to the lower solvent layer and a water sealing layer. A foreign matter removing means for removing the floating foreign matter is provided,
The waste foamed synthetic resin supply means is characterized in that a pushing screw provided rotatably in the cylinder body is provided so as to reach the solvent layer.
[0007]
As a result, the waste foamed synthetic resin is poured into a water-sealed solvent and dissolved in a liquid state, and then this mixed solution (dissolved solution) is separated into a resin component (styrene component) and a solvent component by a separator. Can be recovered and reused. At this time, since the solvent is prevented from evaporating in the water sealing layer, the environment is not deteriorated.
In addition, the discarded foamed synthetic resin can be dissolved by being guided in a solvent, and foreign matters mixed in can be easily removed.
Furthermore , since the pushing screw provided rotatably in the cylinder as the waste foam synthetic resin supply means is provided to reach the lower solvent layer, even if the waste foam synthetic resin has a large buoyancy The discarded foamed synthetic resin can be reliably guided into the solvent layer by being guided by the pushing screw.
In particular, as a solvent, a solvent composed of 60% normal propyl bromide, 35% propylene carbonate, 5% stabilizer and others is used. At the same time, the environment is not destroyed or contaminated and the safety is high, and the waste expanded polystyrene synthetic resin can be easily dissolved.
[0008]
The waste foamed synthetic resin recycling system according to the present invention includes a mixed solution tank provided between the dissolution tank and the heating separation device, and temporarily stores the mixed solution dissolved in the dissolution tank in the mixed solution tank. A mixed solution is introduced from a tank into a heat separation apparatus.
As a result, the mixed solution of the discarded foamed synthetic resin dissolved in the dissolution tank in addition to the above-described functions and effects can be temporarily stored in the mixed solution tank.
[0009]
Further, the heating separation device of the waste foamed synthetic resin recycling system of the present invention is provided with a screw rotatably provided in a heating cylinder in which the upper part is a vaporized solvent passage, and the mixed solution is contained in the heating cylinder. While being supplied, heated and kneaded by the screw and sent in the outlet direction, the solvent is vaporized and discharged to the solvent liquid tank through the passage, and the resin component is discharged from the outlet.
As a result, in addition to the above actions and effects, the mixed solution in which the waste foamed synthetic resin is dissolved with the solvent can be easily separated into the resin component and the solvent component.
[0010]
The recycling system for waste foamed synthetic resin according to the present invention is characterized in that the dissolution tank is mounted on a traveling body, and the discarded foamed synthetic resin is introduced into the dissolution tank at a disposal place, and is dissolved and recovered.
As a result, in addition to the functions and effects described above, the discarded foamed synthetic resin can be recovered by reducing the volume at the disposal site.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described in detail. FIG. 1 is an overall explanatory view showing a recycling system of the present invention.
The recycling system shown in the figure includes a dissolution tank 1 in which a solvent is sealed in water, and a discarded foamed synthetic resin (hereinafter simply referred to as foamed resin) is poured into the solvent that is sealed in water to dissolve it. A mixed solution tank 11 for storing the mixed solution dissolved in the dissolution tank 1, a heating separation device 12 for separating the mixed solution in the mixed solution tank 11 into a resin component and a solvent component, and separation by the heating separation device 12. A solvent solution tank 23 for collecting and storing the solvent and a solidifying device 16 for solidifying the separated resin component, and a mixed solution of foamed resin dissolved in the solvent in the dissolution tank 1 Is once stored in the mixed solution tank 11 and then injected into the heat separation device 12 to be separated into a resin component and a solvent component, and the separated solvent is recovered in the solvent liquid tank 23 and reused and separated. Resin content is solidification device 16 Be re-used is solidified to move.
[0012]
FIG. 2 is an enlarged schematic explanatory view of the dissolution tank. As shown in FIG. 2, the solvent contained in the dissolution tank 1 becomes the lower layer A and is sealed with the upper water seal layer B. This prevents the solvent from inadvertently escaping.
The solvent can be used as long as it can dissolve styrene and has a specific gravity greater than that of water, but it is not preferred to destroy or contaminate the environment. In this embodiment, it is highly safe normal. A solvent consisting of 60% propyl bromide, 35% propylene carbonate, 5% stabilizer and others was used.
[0013]
The dissolution tank 1 is provided with a foamed resin supply means 3 for guiding into the lower solvent layer A and a foreign matter removing means 28 for removing foreign matters floating on the interface between the water sealing layer B. The supply means 3 of this example is provided with a screw 5 rotatably inside a cylinder 4 and is rotated by a motor (not shown). The supply means 3 in which the screw 5 is rotatably provided in the cylindrical body 4 is provided with the tip reaching the solvent layer A. The foamed resin thus introduced is surely guided and dissolved in the solvent layer A even if there is buoyancy. As shown in FIG. 2, the foamed resin conveyed by the conveyor 2 is introduced into the supply means 3 by a rotating roller 6 with blades, and is guided and dissolved in the solvent layer A by a rotating screw 5. The foamed resin to be charged is preferably pulverized and charged.
[0014]
Further, the foreign matter removing means 28 removes foreign matters (foreign matter) such as a label floating on the interface of the water sealing layer B, and is constituted by a removal pipe provided with screw blades. This may be a suction type. A dust container 8 for collecting the removed foreign matter is provided at the discharge port of the foreign matter removing means 28.
[0015]
In addition, the discharge path 10 which discharges | emits a volatile solvent to the combustor for incineration (illustration omitted) is provided in the upper part of the dissolution tank 1 with the blower 9 as shown in FIG. That is, the air in the bubbles in the foamed resin rises in the solvent layer A, fills the cover on the dissolution tank 1 through the water sealing layer B, and can flow out into the discharge path 10. The air content in 10 is fed into a combustor (not shown) by a blower 9, and the solvent content contained in the air can be incinerated and removed by a burner of this combustor. The incinerated gas passes through a discharge pipe connected to the combustion cylinder, and is further fed into a neutralization tank (not shown) to neutralize harmful vaporization in the combustion gas and store it in the tank. In addition to being dissolved in water, it can be cooled and discharged into the atmosphere from a chimney (not shown) as harmless air close to room temperature.
[0016]
Further, as shown in FIG. 1, a discharge pipe 7 provided with a pump P3 is connected between the lower side surface of the dissolution tank 1 and the mixed solution tank 11, so that the mixed solution of the foamed resin dissolved in the dissolution tank 1 is present. The liquid solution is discharged and stored in the mixed solution tank 11. A pipe provided with a pump P ₁ is provided at the lower part of the mixed solution tank 11 and is connected to the heating separation device 12.
[0017]
The heating / separating device 12 is provided with a screw 13 rotatably in a heating cylinder 12a, which is a vaporized solvent passage 14 at the top, and is supplied from the mixed solution tank 11 into the heating cylinder 12a through a supply port. The mixed solution is kneaded by the screw 13 while being heated and sent to the outlet direction. During this time, the solvent content of the mixed solution is vaporized, passes through the passage 14 and is collected in the solvent liquid tank 23 via the discharge portion 15, and the resin content is discharged from the outlet to the solidifying device 16. The discharge unit 15 includes cooling means, cools the solvent that has been vaporized and discharged, returns it to a liquid state, and collects it in the solvent liquid tank 23.
[0018]
The solidifying device 16 includes an extruder 17, a cooling means 18, a draining means 19, and a cutting machine 20. The resin component separated and discharged by the heat separation device 12 is extruded into a linear body while being heated by the extruder 17, and the extruded resin component is cooled by the cooling means 18 and drained by the draining means 19. After that, it is cut and pelletized by the cutting machine 20. The pellets cut by the cutting machine 20 are passed through a pellet sorter 21 and sorted and collected in a catcher tank 22. FIG. 3 is a partially enlarged explanatory view of this solidifying device, showing that the resin component is extruded as a linear body into the cooling means 18 while being heated by the extruder 17, cooled and transferred to the draining means 19. ing.
[0019]
FIG. 4 is a modification showing the melting tank supply means, and the same elements as those in the above embodiment are denoted by the same reference numerals and detailed description thereof is omitted. According to this example, since the tip of the cylinder 4 is bent in the solvent layer A, the foamed resin supplied by the screw 5 is reliably supplied into the solvent layer A.
In FIG. 1, reference numeral 24 denotes a heating means for supplying a heat medium to the heating / separating device 12, for example, a boiler, 25 denotes a water-cooled chiller as a cooling means for the exhaust unit 15, and 26 denotes a cleaning tower for purifying the exhaust gas. It is.
[0020]
Further, in the present invention, the dissolution tank 1 may be mounted on the traveling body (tank lorry) 27, and the foamed resin may be introduced into the dissolution tank 1 at a disposal place or a collection place to be dissolved and collected. For example, from a small supermarket where there is not enough space on the site, a home appliance store, etc., the used foamed polystyrene used as a container for fresh fish and fruits and vegetables, home appliances, OA equipment packaging, cushioning materials, etc. is collected, and at the same time a tank The recovered foamed polystyrene is dissolved in a solvent during transportation, and the resin solution is supplied to the mixed solution tank 11.
Since the two-component solvent used in this embodiment has a vaporization temperature of about 66 ° C., the distillation separation temperature can be processed at a low temperature of 100 ° C. or lower, and the ignition point of the solvent itself is 660 ° C. Therefore, inconveniences such as a flaming accident in normal work can be avoided.
[0021]
Of course, the tank lorry 27 can be filled and transported with a new virgin solvent separately from the recycled solvent as a supply and transport means, and can be replenished in the dissolved layer 1 as well.
In particular, when iteratively uses, the amount of use gradually decreases due to loss in the process of transporting the solvent itself or loss due to vaporization. Virgin solvent must be replenished according to the shortage.
Furthermore, the mixing ratio of the volume of water and the solvent is preferably about 7: 3, which allows the odor to be water-sealed and can be carried out without causing any practical problems.
[0022]
Here, examples of the discarded foamed synthetic resin include discarded foamed polystyrene, discarded ABS resin, and discarded foamed AS resin.
The above embodiment is not intended to limit the present invention, and various modifications are allowed without departing from the spirit of the present invention. For example, the mixed solution tank 11 is not necessarily required, and may be introduced directly from the dissolution tank 1 to the heating separation device 12.
[0023]
【The invention's effect】
As explained in detail above, according to the recycling system for waste foamed synthetic resin of the present invention, the following effects can be obtained.
(1) Waste foamed synthetic resin is poured into a water-sealed solvent and dissolved in liquid form, and then this mixed solution (dissolved solution) is separated into a resin component (styrene component) and a solvent component by a separator. Can be recovered and reused. At this time, since the solvent is prevented from evaporating in the water sealing layer, the environment is not deteriorated.
(2) The processing operation is easy and can be performed in a short time, and the running cost is low.
(3) Recyclable raw materials and recycled products can be provided with high quality.
(4) The working environment is not deteriorated.
[0024]
(5) In particular, a solvent composed of 60% normal propyl bromide, 35% propylene carbonate, 5% stabilizer, etc. is used as a solvent. In addition to being sealed with water, the environment is not destroyed or contaminated, and the safety is high, and the waste polystyrene foam synthetic resin can be easily dissolved.
(6) Moreover, since the waste foamed synthetic resin is guided into the solvent layer by the supply means, it is surely dissolved and the dissolution rate is fast.
[0025]
(7) Foreign matter is removed, foreign matter is easily removed, and no other filtering device is required.
(8) The foreign matter is collected in a garbage container and can be treated with another carbonization apparatus.
(9) The synthetic resin can be recovered effectively and without denaturing the resin.
(10) The recovery efficiency of the discarded foamed synthetic resin can be improved by using a special transportation means.
[Brief description of the drawings]
FIG. 1 is an overall explanatory view of a recycling system showing an embodiment of the present invention.
FIG. 2 is an enlarged explanatory view of a dissolution tank.
FIG. 3 is a partially enlarged explanatory view of a solidifying device.
FIG. 4 is an enlarged explanatory view showing a modification of the dissolution tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dissolution tank 3 Supply means 4 Cylinder 5 Screw 11 Mixed solution tank 12 Heating-separation apparatus 12a Heating cylinder 13 Screw 14 Passage 16 Solidification apparatus 17 Extruder 18 Cooling means 20 Cutting machine 23 Solvent liquid tank 27 Traveling body 28 Foreign matter removal means A Lower layer (solvent layer)
B Upper layer (water seal layer)

Claims (4)

The solvent is sealed with water, and the dissolved foamed synthetic resin is poured into the water-sealed solvent for dissolution, and the mixed solution dissolved in the dissolution tank is divided into a resin component and a solvent component. It consists of a heating separation device for separating, a solvent liquid tank for collecting and storing the separated solvent, and a solidifying device for solidifying the separated resin component,
Dissolved foamed synthetic resin mixed solution dissolved in the solvent in the dissolution tank is heated and separated with a heat separator to separate the resin and solvent, and the separated solvent is stored in a solvent tank and reused. And a waste foaming synthetic resin recycling system for solidifying and reusing the separated resin in a solidifying device,
The solvent is a waste foam polystyrene synthetic resin solvent comprising 60% normal propyl bromide, 35% propylene carbonate, 5% stabilizer and the like,
This solvent is placed in the dissolution tank and is sealed with an upper water sealing layer as a lower layer. The dissolution tank is provided with a supply means for waste foam synthetic resin for guiding to the lower solvent layer and a water sealing layer. A foreign matter removing means for removing the floating foreign matter is provided,
The waste foamed synthetic resin recycling system is characterized in that the waste foamed synthetic resin supply means is provided with a push screw rotatably provided in the cylinder so as to reach the solvent layer.   A mixed solution tank is provided between the dissolution tank and the heating separation device, the mixed solution dissolved in the dissolution tank is temporarily stored in the mixed solution tank, and the mixed solution is introduced from the mixed solution tank into the heating separation device. The recycling system for waste foamed synthetic resin according to claim 1.   The heating / separating device is provided with a screw rotatably provided in a heating cylinder, the upper part of which is a vaporized solvent passage, and the mixed solution is supplied into the heating cylinder and is kneaded with the screw while being heated. 3. The recycling of the waste foamed synthetic resin according to claim 1 or 2, wherein the solvent is vaporized and discharged to the solvent liquid tank through the passage while being sent in the direction, and the resin component is discharged from the outlet. system.   The recycling system for a waste foamed synthetic resin according to claim 1 or 2, wherein the dissolution tank is mounted on a traveling body, and the waste foamed synthetic resin is put into the dissolution tank at a disposal place, and is dissolved and recovered. .

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