JP4618096B2 - Waste polymer processing equipment - Google Patents

Description

  The present invention relates to a waste polymer processing apparatus for processing a waste polymer containing foreign matters remaining after filtering a liquid polymer.

  In a polymer polymerization process, a polymer is produced by polymerizing monomers, and foreign matters mixed at that time significantly reduce the commercial value of the polymer as a product. As a cause of the contamination of foreign matter, there may be a case where a foreign matter originally contained in a monomer, a catalyst or the like is mixed, or a case where foreign matter generated in the polymerization process is mixed. Therefore, in order to reduce the foreign matter in the polymer, it is important to find out the cause of the foreign matter and cut it off. However, it is difficult to eliminate the foreign matter by any means. The most reliable way to reduce this is to remove it by filtration.

However, in the case of a polymer having a high viscosity, it is not easy to remove fine foreign substances by filtration. In particular, in order to filter a polymer in a molten state, it has a special structure and a wide filtration area, and has high heat resistance and mechanical properties. A filter having excellent mechanical strength is required (for example, Patent Document 1).
However, even when such a filter is used, as the foreign matter in the polymer is trapped on the filter, the filter becomes clogged and the filtration efficiency is lowered. At this time, if the filter is replaced with a new one, the filtration process must be interrupted once, resulting in deterioration of quality due to heat retention of the polymer or generation of new foreign matters. Furthermore, since the filter replacement work generally needs to be performed at a high temperature so that the polymer does not solidify, there is a serious problem in terms of work safety and efficiency.

In order to solve this problem, a method of continuously updating the filter so as not to affect the process has been proposed (Patent Document 2), and as a method of extending the life until the filter is replaced, the filter is clogged. A method of detecting the degree and performing reverse cleaning of the filter has been proposed (Patent Document 3).
These methods not only significantly extend the filter life and drastically reduce the frequency of filter replacement, but also save labor for filter cleaning by an automated system, and are excellent in terms of safety in filter replacement work.

  However, in these methods, the waste polymer discharged at regular intervals by backwashing accumulates in the discharged place, causing a problem that labor and risk are newly generated in the processing. Furthermore, when the waste polymer is discharged in a molten state, the newly discharged waste polymer is fused to the previously discharged waste polymer and grows into a large lump over time, and the work becomes increasingly complicated. There was a problem of inviting.

JP-A-8-19704 JP-A-6-47794 Special table 2003-516847 gazette

  The present invention has been made in view of such conventional problems, and is capable of smoothly recovering the waste polymer discharged from the polymer filtration device and preventing the waste polymer from adhering. Is to provide.

The reference invention is configured to cool and solidify the liquid waste polymer discharged from the polymer filtration device, and remove the cooled and solidified waste polymer without staying in place. It is in .
According to the waste polymer processing apparatus of the present invention, it is possible to smoothly collect the waste polymer discharged from the polymer filtration apparatus and to prevent the waste polymer from adhering.

The polymer referred to in the present invention is a high molecular weight compound in which monomer units are repeatedly bonded. Specifically, polyethylene, polypropylene, polyvinyl acetate, polyvinyl alcohol, polystyrene, polyacrylonitrile, polymethacrylate, ABS resin, poly Vinyl chloride, polyvinylidene chloride, polycarbonate, polyamide, polyphenylene sulfide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, liquid crystal polyester, polyacetal, polyphenylene oxide, fluorine resin, silicone resin, phenol resin, urethane resin, melamine resin, silicone resin, An epoxy resin, a copolymer thereof, and the like can be mentioned. Among them, the effect of the present invention is great when the resin is a thermoplastic resin.
Examples of the form of filtering the polymer include a solution state dissolved in a solvent, a suspended or emulsified state dispersed in a dispersion medium, and a molten state in which the polymer itself is melted. The improvement effect is great when the temperature during filtration is high and the melt is in a high viscosity state.

  The polymer filtration device in the present invention refers to a device for filtering foreign substances in a polymer using a filter, and known devices can be used, among them, as mentioned in Patent Document 2, without adversely affecting the process, A device that can be continuously replaced with a filter surface with small clogging is preferable, and as mentioned in Patent Document 3, in order not to affect the process on a regular basis, in a portion different from the portion where the filter is used, The filter is preferably of a type that performs so-called back washing, in which clogging of the filter is washed by flowing fresh polymer from the reverse direction of the polymer flow path of the process.

  The liquid waste polymer in the present invention refers to a liquid polymer discharged from a polymer filtration device. Specifically, a polymer having a low commercial value that leaks or oozes from the polymer filtration device, or is discharged by washing. Refers to the polymer made. In particular, when the waste polymer is a polymer that is discharged by backwashing the filter, it is periodically discharged and the accumulated amount is large, so that the improvement effect of the present invention is great.

  In the present invention, it is essential that the liquid waste polymer is cooled and solidified. However, the cooling method is not limited, and a method such as direct contact with a coolant such as water, a cooling plate, etc. The method of indirectly cooling using a refrigerant | coolant is mentioned. Among them, a method in which cooling with a cooling gas is indirectly performed through an inclined cooling plate, and at the same time, the cooling gas is blown directly onto the waste polymer, and the method of simultaneously solidifying the waste polymer and removing it from the cooling plate is preferable. . In this case, since the slipping property after solidification varies depending on the viscosity of the waste polymer, the waste polymer processing apparatus preferably has an angle adjusting function so that the inclination angle of the cooling plate can be changed.

  Further, the cooling plate preferably has a side guard so that the cooled and solidified waste polymer is surely introduced into the recovery shooter. It is particularly preferable that the lifter is disposed on a lifter for adjusting the height, and the lifter is movable using a carriage or the like.

  In the present invention, there is no particular limitation on the method for removing the cooled and solidified waste polymer without staying in the cooled place. When cooling the waste polymer in a coolant such as water, the coolant and the waste polymer are discharged together. Or when cooling directly or indirectly on the cooling plate, there is a method of mechanically removing it with a conveyor or an actuator, etc. Among them, as described above, an inclined cooling plate is used. Thus, a method of removing by using gravity is simple and preferable.

  The upper limit of the outer periphery of the waste polymer cooled and solidified is usually 1000 mm, preferably 800 mm, more preferably 600 mm, and particularly preferably 500 mm. The lower limit is usually 50 mm, preferably 100 mm. If the outer periphery of the cooled waste polymer is too large, it may be clogged with a shooter or the like and recovery may not be successful, or cooling may be insufficient and fusion may occur.

The present invention is a waste polymer processing device for receiving a liquid waste polymer containing foreign substances accumulated in a filter of a polymer filtration device , cooling and solidifying the polymer, and then collecting the waste polymer to a shooter.
The waste polymer processing device receives a liquid waste polymer falling from the polymer filtration device, and slides the waste polymer onto a shooter for recovery, and an upper tilt direction on the upper surface of the cooling tilt plate A sliding blowout nozzle that blows out the sliding gas from the end of the cooling air, and a cooling blowout nozzle that blows out the cooling gas to the lower surface of the cooling inclined plate portion,
The waste polymer dropped on the upper surface of the cooling inclined plate is cooled by the cooling gas, and is pushed out by the sliding gas and slid down to be collected in the shooter. It exists in a processing apparatus (Claim 1 ).

The waste polymer processing apparatus of the present invention is devised to easily recover the liquid waste polymer discharged from the polymer filtration apparatus to the shooter.
That is, the waste polymer processing apparatus has a cooling inclined plate, a sliding blowout nozzle, and a cooling blowout nozzle. Further, the waste polymer processing apparatus is installed with the cooling inclined plate disposed below the waste polymer discharge port in the polymer filtration apparatus.

  The liquid waste polymer discharged from the polymer filtration device falls onto the cooling inclined plate. When the waste polymer falls, the cooling gas is blown from the cooling blowing nozzle, and the sliding gas is blown from the sliding blowing nozzle. It is preferable that the sliding gas also serves as cooling of the waste polymer.

The waste polymer dropped on the upper surface of the cooling inclined plate is cooled by the cooling gas blown to the lower surface of the cooling inclined plate, and solidification is promoted. Thereby, the waste polymer dropped on the upper surface of the cooling inclined plate can be collected into the shooter in a substantially solidified state or a state close to a solid.
Therefore, the waste polymer is hardly attached to the shooter, and it is possible to prevent the handling of the shooter from being deteriorated.

  In addition, the waste polymer dropped on the upper surface of the cooling inclined plate is directed downward in the inclined direction on the upper surface of the cooling inclined plate by the sliding gas blown out from the upper end of the inclined direction on the upper surface of the cooling inclined plate. Pushed out. Therefore, the waste polymer can be prevented from adhering to the cooling inclined plate without stopping sliding in the middle of the cooling inclined plate.

  Therefore, according to the waste polymer treatment device of the present invention, the waste polymer discharged from the polymer filtration device can be smoothly collected into the shooter, and the waste polymer adheres to the shooter or the inclined inclined plate for cooling. Can be prevented.

The waste polymer processing apparatus, it is preferable that an angle adjusting mechanism for adjusting the angle of inclination of the cooling gradient plate (claim 2). In this case, by properly adjusting the inclination angle of the cooling inclined plate using the angle adjusting mechanism, it is possible to achieve a good balance between cooling of the waste polymer and smooth sliding down.

Further, the waste polymer processing apparatus, on both sides of the upper surface of the cooling tilt plate preferably has a side guards to guard the sliding of the waste polymer (claim 3). In this case, the side guard can guard the waste polymer that slides down the upper surface of the cooling inclined plate from accidentally falling to the side.

Further, the cooling gradient plates were arranged on the height adjusting lifter to adjust its height, the height-adjusting lifter, it is preferable to provide on the carriage (claim 4). In this case, the installation height of the cooling inclined plate can be adjusted by the height adjustment lifter. Moreover, the waste polymer processing apparatus provided with the cooling inclined plate and the height adjustment lifter can be moved to various target positions by the carriage.

Hereinafter, embodiments of the waste polymer processing apparatus of the present invention will be described with reference to the drawings.
The waste polymer processing apparatus 1 of this example is configured to process a liquid waste polymer 81 discharged from the polymer filtration apparatus 7 as shown in FIGS.

As shown in FIG. 3, the polymer filtration device 7 constantly filters the molten liquid polymer 80 through the filter 72, and at the same time uses the liquid back-cleaning polymer 82 accumulated on the upstream side of the filter 72. The filter 72 is washed at intervals from the direction opposite to the flow of the liquid polymer 80 and the waste polymer 81 is discharged.
Note that “cleaning at regular intervals” here refers to when cleaning is performed at a constant time interval, when pressure loss at the inlet and outlet portions of the filter 72 is detected, and when the pressure reaches a certain value A case where cleaning is performed when the filter 72 rotates by a certain angle may be mentioned.

As shown in FIGS. 1 and 2, the waste polymer processing apparatus 1 cools and solidifies the liquid waste polymer 81 discharged from the polymer filtration apparatus 7, and does not retain the cooled and solidified waste polymer 81 on the spot. The shooter 6 is configured to be collected.
Specifically, the waste polymer processing apparatus 1 receives the liquid waste polymer 81 that falls from the polymer filtration device 7, and slides the waste polymer 81 onto the shooter 6 for recovery, and this cooling plate 21. A sliding nozzle 31 for blowing the sliding gas A1 from the upper end 201 in the tilt direction D on the upper surface of the inclined plate 21, and a cooling nozzle 32 for blowing the cooling gas A2 to the lower surface of the cooling tilt plate 21 have.

  And the waste polymer processing apparatus 1 of this example cools and solidifies the liquid waste polymer 81 dropped on the upper surface of the cooling inclined plate 21 with the cooling gas A2 and is solidified with the sliding gas A1. The waste polymer 81 is pushed out, slid down, and collected into the shooter 6.

Below, it demonstrates in full detail with FIGS. 1-3 about the waste polymer processing apparatus 1 of this example.
As shown in FIGS. 1 and 2, the waste polymer processing apparatus 1 of this example can easily collect the liquid waste polymer 81 discharged from the polymer filtration apparatus 7 into the shooter 6. And the waste polymer processing apparatus 1 arrange | positions and arrange | positions the cooling inclined plate 21 under the discharge port 74 of the waste polymer 81 in the polymer filtration apparatus 7. FIG.

As shown in FIG. 3, the polymer filtration device 7 of this example includes a polymer passage 71 through which the liquid polymer 80 passes, a filter 72 that is disposed in the middle of the polymer passage 71 and filters the liquid polymer 80, and a liquid polymer A reverse cleaning unit 73 that removes foreign matter accumulated on the upstream side of the filter 72 is used.
The reverse cleaning unit 73 causes a part of the liquid polymer 80 flowing in the polymer passage 71 to flow back as a reverse cleaning polymer 82 from the downstream side to the upstream side of the filter 72, and removes foreign matter accumulated on the upstream side of the filter 72. The waste polymer 81 is mixed with the reverse cleaning polymer 82 to form the waste polymer 81, and the waste polymer 81 is discharged from the discharge port 74 in the polymer filtration device 7.

As shown in FIG. 1, the shooter 6 of this example slides down the cooling inclined plate 21, receives the waste polymer 81 falling from the lower end portion 202 of the inclined direction D of the cooling inclined plate 21, and slides it down. It is a waste duct that collects to the waste collection point.
In addition, the shooter 6 can also be a bat (collection box) in which the waste polymer 81 is accumulated.

  As shown in FIG. 1 and FIG. 2, the sliding gas A1 and the cooling gas A2 in this example are preferably air, and the sliding nozzle 31 and the cooling nozzle 32 are formed of an air pipe 33 used in the factory. It is provided at the tip. In the air pipe 33, valves 34 are arranged on the upstream side of the sliding blowout nozzle 31 and on the upstream side of the cooling blowing nozzle 32, respectively, and by these valves 34, the blowout flow rate and cooling of the sliding down gas A1 are arranged. The blowing flow rate of the working gas A2 can be adjusted respectively.

In this example, when the liquid polymer 80 is passed through the polymer filtration device 7 and the liquid polymer 80 is being filtered, each valve 34 is opened, and the sliding blowout nozzle 31 and the cooling blowout nozzle are opened. The gas 32 for sliding down and the gas A2 for cooling are always blown out from 32 respectively.
Then, the waste polymer processing device 1 receives the liquid waste polymer 81 periodically discharged from the polymer filtration device 7 on the cooling inclined plate 21 and slides it down to the shooter 6 in a state of being almost solidified by cooling. . Further, the waste polymer 81 is solidified in a plate shape on the upper surface of the cooling inclined plate 21 and is collected into the shooter 6.

  As shown in FIGS. 1 and 2, the waste polymer processing apparatus 1 of this example includes an angle adjustment mechanism 4 that adjusts the inclination angle of the cooling inclined plate 21. By appropriately adjusting the inclination angle of the cooling inclined plate 21 using the angle adjusting mechanism 4, the liquid waste polymer 81 is solidified by the cooling gas A2 even when the type and viscosity of the polymer to be processed are changed. During the operation, the waste polymer 81 hardly slides, and when the waste polymer 81 is almost solidified, the waste polymer 81 can be adjusted to smoothly slide on the upper surface of the cooling inclined plate 21.

The angle adjustment mechanism 4 of this example is configured using a pantograph jack 4. The pantograph jack 4 can change the vertical position of the holding portion 43 provided on the upper part of the left and right pantograph members 42 by expanding and reducing the interval between the left and right pantograph members 42 by rotating the screw part 41. is there. In this example, the holding portion 43 of the pantograph jack 4 is attached to the upper end 201 of the cooling inclined plate 21 in the inclined direction D. And the inclination angle of the cooling inclined plate 21 can be adjusted by rotating the screw part 41 of the pantograph jack 4.
In addition to the pantograph jack 4, a screw jack or the like can be used as the angle adjustment mechanism 4.

Further, as shown in FIGS. 1 and 2, plate-like side guards 22 that guard the sliding-off of the waste polymer 81 are provided upright on both sides of the upper surface of the cooling inclined plate 21. By this side guard 22, it is possible to guard that the waste polymer 81 sliding down the upper surface of the cooling inclined plate 21 does not accidentally fall to the side.
In addition, the waste polymer processing apparatus 1 is formed by forming a plate-like stay wall 23 from the entire periphery on the lower surface of the cooling inclined plate 21. By forming the stay wall 23, the cooling gas A <b> 2 blown out from the cooling nozzle 32 can be retained on the lower surface of the cooling inclined plate 21, and the waste polymer 81 is cooled on the upper surface of the cooling inclined plate 21. Can be performed effectively.

  As shown in FIG. 1, the cooling inclined plate 21 is disposed on a height adjustment lifter 51 that adjusts its height, and the height adjustment lifter 51 is disposed on a carriage 52. is there. The cart 52 of this example has a plurality of casters 521 and can be moved by an operator, and the height adjustment lifter 51 is a pantograph lifter 51 provided on the cart 52. The installation height of the cooling inclined plate 21 can be adjusted by the height adjustment lifter 51, and the waste polymer processing apparatus 1 can be moved to various target positions by the carriage 52.

  As shown in FIG. 2, when the liquid polymer 80 is filtered using the polymer filtration device 7, the liquid waste polymer 81 discharged from the polymer filtration device 7 is a cooling inclined plate in the waste polymer processing device 1. Falls on 21. When the waste polymer 81 falls, the cooling gas A2 is blown from the cooling blowing nozzle 32, and the sliding gas A1 is blown from the sliding blowout nozzle 31.

The waste polymer 81 dropped on the upper surface of the cooling inclined plate 21 is cooled by the cooling gas A2 blown out on the lower surface of the cooling inclined plate 21, and the solidification is promoted. Thereby, the waste polymer 81 dropped on the upper surface of the cooling inclined plate 21 can be recovered to the shooter 6 in a substantially solidified state or a state close to a solid. Therefore, the waste polymer 81 hardly adheres to the shooter 6, and it is possible to prevent the handling of the shooter 6 such as maintenance and cleaning from being deteriorated.
The waste polymer 81 recovered to the shooter 6 is guided to the waste polymer recovery container (not shown) through the shooter 6 by the action of gravity.

  Further, the waste polymer 81 that has fallen on the upper surface of the cooling inclined plate 21 is caused by the sliding gas A1 blown from the upper end 201 in the inclination direction D on the upper surface of the cooling inclined plate 21 to the cooling inclined plate 21. Pushed toward the lower end 202 of the tilt direction D on the upper surface. Therefore, the waste polymer 81 can be prevented from adhering to the cooling inclined plate 21 without stopping sliding in the middle of the cooling inclined plate 21.

  Therefore, according to the waste polymer processing apparatus 1 of the present example, the waste polymer 81 discharged from the polymer filtration device 7 can be smoothly collected into the shooter 6, and the waste polymer is disposed on the shooter 6 or the cooling inclined plate 21. It is possible to prevent 81 from adhering.

The perspective view which shows the waste polymer processing apparatus and polymer filtration apparatus in an Example. Sectional drawing which expands and shows the principal part of a waste polymer processing apparatus in an Example. The perspective explanatory view showing the polymer filtration device in an example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste polymer processing apparatus 21 Cooling inclined plate 22 Side guard 31 Sliding blowout nozzle 32 Cooling blowout nozzle 4 Angle adjustment mechanism 51 Height adjustment lifter 52 Cart 6 Shooter 7 Polymer filtration apparatus 80 Liquid polymer 81 Waste polymer 82 For back washing Polymer A1 Gas for sliding down A2 Gas for cooling D Inclination direction

Claims (4)

A waste polymer processing device for receiving a liquid waste polymer containing foreign substances accumulated in a filter of a polymer filtration device, cooling and solidifying the polymer, and then collecting the waste polymer to a shooter,
  The waste polymer processing device receives a liquid waste polymer falling from the polymer filtration device, and slides the waste polymer onto a shooter for recovery, and an upper tilt direction on the upper surface of the cooling tilt plate A sliding blowout nozzle that blows out the sliding gas from the end of the cooling air, and a cooling blowout nozzle that blows out the cooling gas to the lower surface of the cooling inclined plate portion,
  The waste polymer dropped on the upper surface of the cooling inclined plate is cooled by the cooling gas, and is pushed out by the sliding gas to be slid down and collected in the shooter. Processing equipment. The waste polymer processing apparatus according to claim 1, further comprising an angle adjusting mechanism that adjusts an inclination angle of the cooling inclined plate. The waste polymer processing apparatus according to claim 1 or 2, further comprising a side guard that guards sliding of the waste polymer on both sides of the upper surface of the cooling inclined plate. 4. The cooling inclined plate is disposed on a height adjustment lifter for adjusting the height thereof, and the height adjustment lifter is disposed on a carriage. The waste polymer processing apparatus as described in any one of these.

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