CA2105142C - Method of recovering polystyrene waste materials and its apparatus for dissolving polystyrene waste materials - Google Patents
Method of recovering polystyrene waste materials and its apparatus for dissolving polystyrene waste materials Download PDFInfo
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- CA2105142C CA2105142C CA 2105142 CA2105142A CA2105142C CA 2105142 C CA2105142 C CA 2105142C CA 2105142 CA2105142 CA 2105142 CA 2105142 A CA2105142 A CA 2105142A CA 2105142 C CA2105142 C CA 2105142C
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- solvent
- polystyrene
- waste materials
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- dissolving
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
-
- 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
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
In an apparatus for dissolving polystyrene waste materials, the polystyrene waste materials are allowed to dissolve into a chlorinated solvent, providing a dissolving treatment apparatus for polystyrene waste materials which is low in collection and conveyance expenses, has a short treatment time, has no public nuisance problem such as the occurrence of black smoke, and is safe for humans. This apparatus is constituted to soak a polystyrene waste material 5 contained in a container 4 consisting of a water layer 2 at the upper portion and a solvent layer 3 of chlorinated hydrocarbons at the lower portion into the solvent layer 3 forcedly. The foamed polystyrene waste materials 5 can be dissolved swiftly.
Description
SPECIFICATION
1. TITLE OF THE INVENTION
Method of Recovering Polystyrene Waste Materials and its Apparatus for Dissolving Polystyrene Waste Materials 2. BACRGROUND OF THE INVENTION
This invention relates to a dissolving apparatus for polystyrene waste materials which reuse plastic waste materials based upon the polystyrene, and more particularly relates to a dissolving apparatus for foamed polystyrene waste materials.
Since the polystyrene is easily molded, excellent in electrical properties and is able to avail various kinds of molding methods such as injection molding, etc., its range of use is very wide, from molding products to various kinds of tools, devices, furniture, etc. as materials in place of wood or metals. Further, an enormous amount of foamed polystyrenes are used as insulating materials, buffer materials, food containers and the like.
Accordingly, the amount of waste materials that must be subjected to treatment has naturally increased based upon the increase of such widely available ranges of polystyrene. A
particular reason for the increase in these waste materials is because many daily food items are generally packaged in plastic packages or receptacles made of polystyrene and the like.
The plastics made of polystyrene and the like possess stable chemical characteristics against natural environmental conditions, is insoluble in water, not attacked by oxygen in air and, further, not changed to other substances by micro-organisms living in the earth nor dissolved. Accordingly, plastics of polystyrene and the like produced in large quantities cause serious problems from the point of waste material treatment.
As conventional treatment methods for polystyrene waste materials there exist, e.g. (1) a crushing method which physically grinds the material to pieces; (2) electrical dissolving method, and (3) burning method.
However, in such conventional treatment methods, the first method above entails high costs for collection of the waste materials and their conveyance to the treatment place because yhe waste materials, especially foamed polystyrene, are bulky;
the second method requires a long dissolving time and the third method produces a great volume of black smoke during burning, resulting in a public nuisance and environmental contamination.
This invention performs in view of such conventional problems and its object is to provide an economical and safe dissolution apparatus for polystyrene waste materials which is able to treat the polystyrene waste materials without such public nuisances such as black smoke, while keeping the cost of collection and conveyance low and shortening the time required by dissolving the polystyrene waste materials in a special solvent.
1. TITLE OF THE INVENTION
Method of Recovering Polystyrene Waste Materials and its Apparatus for Dissolving Polystyrene Waste Materials 2. BACRGROUND OF THE INVENTION
This invention relates to a dissolving apparatus for polystyrene waste materials which reuse plastic waste materials based upon the polystyrene, and more particularly relates to a dissolving apparatus for foamed polystyrene waste materials.
Since the polystyrene is easily molded, excellent in electrical properties and is able to avail various kinds of molding methods such as injection molding, etc., its range of use is very wide, from molding products to various kinds of tools, devices, furniture, etc. as materials in place of wood or metals. Further, an enormous amount of foamed polystyrenes are used as insulating materials, buffer materials, food containers and the like.
Accordingly, the amount of waste materials that must be subjected to treatment has naturally increased based upon the increase of such widely available ranges of polystyrene. A
particular reason for the increase in these waste materials is because many daily food items are generally packaged in plastic packages or receptacles made of polystyrene and the like.
The plastics made of polystyrene and the like possess stable chemical characteristics against natural environmental conditions, is insoluble in water, not attacked by oxygen in air and, further, not changed to other substances by micro-organisms living in the earth nor dissolved. Accordingly, plastics of polystyrene and the like produced in large quantities cause serious problems from the point of waste material treatment.
As conventional treatment methods for polystyrene waste materials there exist, e.g. (1) a crushing method which physically grinds the material to pieces; (2) electrical dissolving method, and (3) burning method.
However, in such conventional treatment methods, the first method above entails high costs for collection of the waste materials and their conveyance to the treatment place because yhe waste materials, especially foamed polystyrene, are bulky;
the second method requires a long dissolving time and the third method produces a great volume of black smoke during burning, resulting in a public nuisance and environmental contamination.
This invention performs in view of such conventional problems and its object is to provide an economical and safe dissolution apparatus for polystyrene waste materials which is able to treat the polystyrene waste materials without such public nuisances such as black smoke, while keeping the cost of collection and conveyance low and shortening the time required by dissolving the polystyrene waste materials in a special solvent.
3. SUMMARY OF THE INVENTION
The dissolving apparatus for polystyrene waste materials of this invention is characterized by being provided with: a container which contains a water layer and a polystyrene dissolving layer as an upper and a lower layer, respectively;
and an urged means for dissolving the polystyrene waste materials in the above layer by contacting them with the above solvent in the lower layer.
Thus, according to one aspect of the invention there is provided an apparatus for dissolving polystyrene waste materials, comprising a container containing a layer of a solvent for polystyrene having a specific gravity in the range of 1.3 to 1.6 and a layer of water overlying the layer of solvent, and urging means for bringing polystyrene introduced into the container into contact with said layer of solvent beneath said layer of water, thereby enabling the polystyrene to dissolve in the solvent.
According to another aspect of the invention there is provided a method of dissolving polystyrene in a liquid solvent, which comprises providing a layer of a solvent for polystyrene having a specific gravity of 1.3 to 1.6, covering the layer of solvent with a layer of water, introducing polystyrene into the layer of water, and urging the A
polystyrene into the layer of solvent underlying the layer of water to cause the polystyrene to dissolve in the solvent.
In this invention, in the layer of the dissolving apparatus, such solvent having water at the upper layer and a polystyrene solvent at the lower layer, namely a solvent having more than 1 of specific gravity is selected. By this, the upper surface of the solvent is sealed with water whereby vaporization of the solvent can be prevented. This is also beneficial in terms of odor, safety and sanitation. However, the solvent having more than 1 s.g. of polystyrene solvent is limited to chlorinated hydrocarbons, e.g., carbon tetrachloride (s. g. 1.60), trichloroethylene (s. g. 1.464), methylene chloride (s. g. 1.326), tetrachloroethylene (s.g. 1.6226) etc. On the other hand, polystyrene is 1.05 in s.g. and, further, since foamed polystyrene is remarkably small in s.g., it is not soaked in the solvent as it is, and, accordingly, its solution requires much time and labor thereby decreasing operational efficiency. In the apparatus of this invention, an urged means for soaking is provided for dissolving a polystyrene such as foamed 2a polystyrene, etc., in the above container by contacting it with the above solvent. Accordingly, the difficulty of soaking is removed, increasing the operational dissolving efficiency.
The dissolving apparatus for polystyrene waste materials of this invention is characterized by being provided with: a container which contains a water layer and a polystyrene dissolving layer as an upper and a lower layer, respectively;
and an urged means for dissolving the polystyrene waste materials in the above layer by contacting them with the above solvent in the lower layer.
Thus, according to one aspect of the invention there is provided an apparatus for dissolving polystyrene waste materials, comprising a container containing a layer of a solvent for polystyrene having a specific gravity in the range of 1.3 to 1.6 and a layer of water overlying the layer of solvent, and urging means for bringing polystyrene introduced into the container into contact with said layer of solvent beneath said layer of water, thereby enabling the polystyrene to dissolve in the solvent.
According to another aspect of the invention there is provided a method of dissolving polystyrene in a liquid solvent, which comprises providing a layer of a solvent for polystyrene having a specific gravity of 1.3 to 1.6, covering the layer of solvent with a layer of water, introducing polystyrene into the layer of water, and urging the A
polystyrene into the layer of solvent underlying the layer of water to cause the polystyrene to dissolve in the solvent.
In this invention, in the layer of the dissolving apparatus, such solvent having water at the upper layer and a polystyrene solvent at the lower layer, namely a solvent having more than 1 of specific gravity is selected. By this, the upper surface of the solvent is sealed with water whereby vaporization of the solvent can be prevented. This is also beneficial in terms of odor, safety and sanitation. However, the solvent having more than 1 s.g. of polystyrene solvent is limited to chlorinated hydrocarbons, e.g., carbon tetrachloride (s. g. 1.60), trichloroethylene (s. g. 1.464), methylene chloride (s. g. 1.326), tetrachloroethylene (s.g. 1.6226) etc. On the other hand, polystyrene is 1.05 in s.g. and, further, since foamed polystyrene is remarkably small in s.g., it is not soaked in the solvent as it is, and, accordingly, its solution requires much time and labor thereby decreasing operational efficiency. In the apparatus of this invention, an urged means for soaking is provided for dissolving a polystyrene such as foamed 2a polystyrene, etc., in the above container by contacting it with the above solvent. Accordingly, the difficulty of soaking is removed, increasing the operational dissolving efficiency.
4. BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is an elevation sectional view which shows an inner construction of an embodiment of the dissolving apparatus for polystyrene waste materials according to this invention.
Fig. 1 is an elevation sectional view which shows an inner construction of an embodiment of the dissolving apparatus for polystyrene waste materials according to this invention.
5. DETAILED DESCRIPTION OF THE INVENTION
An embodiment of this invention is described with reference to the drawings as follows.
Fig. 1 is a vertical sectional view of the embodiment of the polystyrene waste materials of this invention.
In Fig. 1, the dissolving apparatus 1 consisting of a container 4 having a water layer 2 at the upper portion and a solvent layer 3 at the lower layer, said dissolving apparatus 1 being constituted so that the polystyrene waste materials 5 may be embedded in the above layers 2, 3 and may be lidded with a lid body 6. The lid body 6 is provided with a gas (air) discharging hole 6 at the upper surface thereof, while the lower surface thereof is constituted so that the polystyrene waste materials 5 may be embedded in the above water layer 2 and the solvent layer 3 to dissolve the polystyrene waste material.
An air cylinder 7 is provided at the upper portion of the lid 6 of the container 6, and a rod 8 of the air cylinder 7 urges the polyethylene waste materials 5 so as to embed them into the solvent layer 3 through a pushing plate 9 in the container 4.
In this embodiment, a coil spring 10 is provided between the top end 8a of the rod 8 and the pushing plate 9 and the polyethyrene waste materials are allowed to embed into the solvent layer in order by the coil spring 10 to dissolve swiftly.
Further, an apparatus 12 provided at the side of the container 4 is a control apparatus which controls a compressor 11 and the main apparatus.
As material for the container 4, steel, stainless steel, glass, earthenware, etc. may be used, if these are resistant against the soluble power of the solvent. A container made of glass is convenient because the inside can be seen and dissolving conditions monitored. On the other hand, a drum can made of iron is convenient because it utilizes a waste material.
The lid body 6 and the coil spring 10 may also be made of iron.
This embodiment illustrates one provided with the air cylinder 7 and the coil spring 10 as shown in Fig. 1. However, any form or any mode may be used if it possesses such function which urges the polystyrene waste materials 5 to embed into the above layers 2, 3.
As a solvent of polystyrene, esters such as acetic acid ethyl, acetic acid methylester and the like; ketones such as acetone, methylethyl ketone and the like; aromatic hydrocarbons such as benzene, toluene, xylene and the like; and chlorinated hydrocarbons, such as carbon tetrachloride, methlene chloride, dichloromethane, trichloromethane, tetrachloromethane, 1, 2-dichloroethane, methylchloroethyl, trichloroethylene, tetrachloroethylene and the like; are listed. However, in order to seal the upper surface of the solvent layer 3 with water layer 2 from the point of order, safety and human sanitation by preventing the volatilization of the solvent as described above, the specif is gravity of the solvent must be more than 1 and heavier than that of water. The solvents which satisfy this condition are limited to the above chlorinated hydrocarbons. In addition to the above advantages, these chlorinated hydrocarbons have the advantage that the solvents themselves are incombustible.
Among the above chlorinated solvents, trichloroethylene, tetrachloroethylene and methylchloroethylene are preferable from the standpoint of solubility and volatility. Although these chlorinated solvents may be single or a mixture of more than two kinds, a mixture in ratio of trichloroethylene 7 vs. the remaining one (tetrachloroethylene or methylchloroethylene) 3 in weight ratio is especially high in the velocity of dissolving the polystyrene waste materials. Further, since the treatment after dechlorination at the time of burning as a final treatment can be performed together with desulfurization, this treatment is preferable.
A ratio of the above chlorization solvent and water as a sealing material is desirable to be 100 weight parts of the solvent to 25 weight parts of water. Such ratio has such advantage that even if the solution in which the polystyrene waste materials are dissolved therein is burned as it is, the maximum combustion temperature thereof is controlled at about 1800°C and damage to a furnace can be prevented. When the weight ratio of water is above 25 weight parts, the dissolving apparatus becomes large in size and uneconomical. On the other hand, when the above weight ratio is less than 25 weight parts, a sealing effect due to water decreases, especially after the solubility in the dissolving apparatus is saturated, when the solution is conveyed to the final treatment place for a fractional distillation in order to reavail the effective components and for combustion treatment of excess recovery parts, such fear as exposure of the solvent to the surface directly occurs when the dissolving apparatus is inclined.
Since the dissolving apparatus for polystyrene waste materials of this invention is constituted as above, when the solvent 3 is poured into the container 4 and the water 2 is poured, the water is stored at the upper portion to form the water layer 2 at the upper portion and form the solvent layer 3 at the lower portion due to the difference in the specific gravity. Then, when the polystyrene waste materials 5 are put into the container 4, the waste materials 5 float on the chlorinated solvent 3 and form a floating state wherein a part of the waste materials are sunk into the water layer 2.
However, in this state, the above solving treatment must be administered many times and treatment efficiency decreases.
Therefore, the foamed polystyrene waste materials 5 are pressed into the solvent layer 3 by the urged force of the air cylinder 7 and the coil spring 10. Thus, the foamed styrene waste materials 5 are submerged into the chlorinated solvent instantaneously to dissolve with hardly any generation of heat due to the dissolving reaction releasing bubbles included in the waste materials 5.
Further, it is not too much to say that food containers having surfaces which are difficult to foam and difficult to dissolve are effectively dissolved after being pre-cut into several pieces. In this case, even after dissolving the waste materials 5 of 200 times the solvent weight, their volume shows that there is nearly no change as compared with the volume of the original solvent layer 3 in spite of an increase of about 200 times in weight. Accordingly, the dissolving apparatus 1 is not only useful even when small, but also there is no temperature increase due to the heat of the solution. By this, the solution does not boil and a sufficient sealing effect due to the solvent layer 3 is displayed by the water layer 2. The odor and unsanitariness are thus avoided.
According to this invention, by dissolving the polystyrene waste materials into the chlorinated solvent, about 200 times as much waste materials as the solvent weight can be treated with hardly any increase in volume with respect to the original volume of the solvent. Accordingly, the size of the dissolving apparatus can be managed with about 1/100 in size with respect to the waste volume whereby collection and conveying expenses for the waste materials can be greatly decreased. Further, since the waste materials can be soaked forcedly into the solvent in this invention, the dissolving treatment can be performed in a short time together with having strong dissolubility. Furthermore, according to this invention, the recovery and the reuse of the effective component is possible by the separated distillation of the solution whereby not only the saving of resources can be performed, but also the dense solution of the polystyrene waste materials can be used as an adhesive. Still further, according to this invention, this solvent is available as a fuel directly without damaging the furnace by availing the combination of a specific ratio of the chlorinated solvent, thereby being able to save the heat energy source.
An embodiment of this invention is described with reference to the drawings as follows.
Fig. 1 is a vertical sectional view of the embodiment of the polystyrene waste materials of this invention.
In Fig. 1, the dissolving apparatus 1 consisting of a container 4 having a water layer 2 at the upper portion and a solvent layer 3 at the lower layer, said dissolving apparatus 1 being constituted so that the polystyrene waste materials 5 may be embedded in the above layers 2, 3 and may be lidded with a lid body 6. The lid body 6 is provided with a gas (air) discharging hole 6 at the upper surface thereof, while the lower surface thereof is constituted so that the polystyrene waste materials 5 may be embedded in the above water layer 2 and the solvent layer 3 to dissolve the polystyrene waste material.
An air cylinder 7 is provided at the upper portion of the lid 6 of the container 6, and a rod 8 of the air cylinder 7 urges the polyethylene waste materials 5 so as to embed them into the solvent layer 3 through a pushing plate 9 in the container 4.
In this embodiment, a coil spring 10 is provided between the top end 8a of the rod 8 and the pushing plate 9 and the polyethyrene waste materials are allowed to embed into the solvent layer in order by the coil spring 10 to dissolve swiftly.
Further, an apparatus 12 provided at the side of the container 4 is a control apparatus which controls a compressor 11 and the main apparatus.
As material for the container 4, steel, stainless steel, glass, earthenware, etc. may be used, if these are resistant against the soluble power of the solvent. A container made of glass is convenient because the inside can be seen and dissolving conditions monitored. On the other hand, a drum can made of iron is convenient because it utilizes a waste material.
The lid body 6 and the coil spring 10 may also be made of iron.
This embodiment illustrates one provided with the air cylinder 7 and the coil spring 10 as shown in Fig. 1. However, any form or any mode may be used if it possesses such function which urges the polystyrene waste materials 5 to embed into the above layers 2, 3.
As a solvent of polystyrene, esters such as acetic acid ethyl, acetic acid methylester and the like; ketones such as acetone, methylethyl ketone and the like; aromatic hydrocarbons such as benzene, toluene, xylene and the like; and chlorinated hydrocarbons, such as carbon tetrachloride, methlene chloride, dichloromethane, trichloromethane, tetrachloromethane, 1, 2-dichloroethane, methylchloroethyl, trichloroethylene, tetrachloroethylene and the like; are listed. However, in order to seal the upper surface of the solvent layer 3 with water layer 2 from the point of order, safety and human sanitation by preventing the volatilization of the solvent as described above, the specif is gravity of the solvent must be more than 1 and heavier than that of water. The solvents which satisfy this condition are limited to the above chlorinated hydrocarbons. In addition to the above advantages, these chlorinated hydrocarbons have the advantage that the solvents themselves are incombustible.
Among the above chlorinated solvents, trichloroethylene, tetrachloroethylene and methylchloroethylene are preferable from the standpoint of solubility and volatility. Although these chlorinated solvents may be single or a mixture of more than two kinds, a mixture in ratio of trichloroethylene 7 vs. the remaining one (tetrachloroethylene or methylchloroethylene) 3 in weight ratio is especially high in the velocity of dissolving the polystyrene waste materials. Further, since the treatment after dechlorination at the time of burning as a final treatment can be performed together with desulfurization, this treatment is preferable.
A ratio of the above chlorization solvent and water as a sealing material is desirable to be 100 weight parts of the solvent to 25 weight parts of water. Such ratio has such advantage that even if the solution in which the polystyrene waste materials are dissolved therein is burned as it is, the maximum combustion temperature thereof is controlled at about 1800°C and damage to a furnace can be prevented. When the weight ratio of water is above 25 weight parts, the dissolving apparatus becomes large in size and uneconomical. On the other hand, when the above weight ratio is less than 25 weight parts, a sealing effect due to water decreases, especially after the solubility in the dissolving apparatus is saturated, when the solution is conveyed to the final treatment place for a fractional distillation in order to reavail the effective components and for combustion treatment of excess recovery parts, such fear as exposure of the solvent to the surface directly occurs when the dissolving apparatus is inclined.
Since the dissolving apparatus for polystyrene waste materials of this invention is constituted as above, when the solvent 3 is poured into the container 4 and the water 2 is poured, the water is stored at the upper portion to form the water layer 2 at the upper portion and form the solvent layer 3 at the lower portion due to the difference in the specific gravity. Then, when the polystyrene waste materials 5 are put into the container 4, the waste materials 5 float on the chlorinated solvent 3 and form a floating state wherein a part of the waste materials are sunk into the water layer 2.
However, in this state, the above solving treatment must be administered many times and treatment efficiency decreases.
Therefore, the foamed polystyrene waste materials 5 are pressed into the solvent layer 3 by the urged force of the air cylinder 7 and the coil spring 10. Thus, the foamed styrene waste materials 5 are submerged into the chlorinated solvent instantaneously to dissolve with hardly any generation of heat due to the dissolving reaction releasing bubbles included in the waste materials 5.
Further, it is not too much to say that food containers having surfaces which are difficult to foam and difficult to dissolve are effectively dissolved after being pre-cut into several pieces. In this case, even after dissolving the waste materials 5 of 200 times the solvent weight, their volume shows that there is nearly no change as compared with the volume of the original solvent layer 3 in spite of an increase of about 200 times in weight. Accordingly, the dissolving apparatus 1 is not only useful even when small, but also there is no temperature increase due to the heat of the solution. By this, the solution does not boil and a sufficient sealing effect due to the solvent layer 3 is displayed by the water layer 2. The odor and unsanitariness are thus avoided.
According to this invention, by dissolving the polystyrene waste materials into the chlorinated solvent, about 200 times as much waste materials as the solvent weight can be treated with hardly any increase in volume with respect to the original volume of the solvent. Accordingly, the size of the dissolving apparatus can be managed with about 1/100 in size with respect to the waste volume whereby collection and conveying expenses for the waste materials can be greatly decreased. Further, since the waste materials can be soaked forcedly into the solvent in this invention, the dissolving treatment can be performed in a short time together with having strong dissolubility. Furthermore, according to this invention, the recovery and the reuse of the effective component is possible by the separated distillation of the solution whereby not only the saving of resources can be performed, but also the dense solution of the polystyrene waste materials can be used as an adhesive. Still further, according to this invention, this solvent is available as a fuel directly without damaging the furnace by availing the combination of a specific ratio of the chlorinated solvent, thereby being able to save the heat energy source.
Claims (2)
1. An apparatus for dissolving polystyrene waste materials, comprising:
a container containing a layer of a solvent for polystyrene having a specific gravity in the range of 1.3 to 1.6 and a layer of water overlying the layer of solvent, and urging means for bringing polystyrene introduced into the container into contact with said layer of solvent beneath said layer of water, thereby enabling the polystyrene to dissolve in the solvent.
a container containing a layer of a solvent for polystyrene having a specific gravity in the range of 1.3 to 1.6 and a layer of water overlying the layer of solvent, and urging means for bringing polystyrene introduced into the container into contact with said layer of solvent beneath said layer of water, thereby enabling the polystyrene to dissolve in the solvent.
2. A method of dissolving polystyrene in a liquid solvent, which comprises:
providing a layer of a solvent for polystyrene having a specific gravity of 1.3 to 1.6, covering the layer of solvent with a layer of water, introducing polystyrene into the layer of water, and urging the polystyrene into the layer of solvent underlying the layer of water to cause the polystyrene to dissolve in the solvent.
providing a layer of a solvent for polystyrene having a specific gravity of 1.3 to 1.6, covering the layer of solvent with a layer of water, introducing polystyrene into the layer of water, and urging the polystyrene into the layer of solvent underlying the layer of water to cause the polystyrene to dissolve in the solvent.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2105142 CA2105142C (en) | 1993-08-30 | 1993-08-30 | Method of recovering polystyrene waste materials and its apparatus for dissolving polystyrene waste materials |
| JP15931494A JPH0762137A (en) | 1993-08-30 | 1994-06-17 | Method of recovering polystyrene waste nd apparatus for dissolving polystyrene waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2105142 CA2105142C (en) | 1993-08-30 | 1993-08-30 | Method of recovering polystyrene waste materials and its apparatus for dissolving polystyrene waste materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2105142A1 CA2105142A1 (en) | 1995-03-01 |
| CA2105142C true CA2105142C (en) | 2001-03-13 |
Family
ID=4152224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2105142 Expired - Fee Related CA2105142C (en) | 1993-08-30 | 1993-08-30 | Method of recovering polystyrene waste materials and its apparatus for dissolving polystyrene waste materials |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0762137A (en) |
| CA (1) | CA2105142C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303141C (en) * | 2003-10-30 | 2007-03-07 | 同济大学 | Method for recycling paper and plastic from waste product of one-off paper and plastic health aids |
| JP6276723B2 (en) * | 2015-02-26 | 2018-02-07 | Ｊｆｅエンジニアリング株式会社 | Hazardous polystyrene foam waste disposal method and hazardous foam polystyrene waste disposal equipment |
| JP7222154B2 (en) * | 2020-12-02 | 2023-02-14 | 株式会社ミライ化成 | Reactor for recovering reinforcing fiber and method for producing regenerated reinforcing fiber |
| KR102617143B1 (en) * | 2023-03-30 | 2023-12-27 | (주)유진이엔지 | Apparatus for treating waste styrofoam |
-
1993
- 1993-08-30 CA CA 2105142 patent/CA2105142C/en not_active Expired - Fee Related
-
1994
- 1994-06-17 JP JP15931494A patent/JPH0762137A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CA2105142A1 (en) | 1995-03-01 |
| JPH0762137A (en) | 1995-03-07 |
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