KR102112418B1 - Method and apparatus for recovering polyester monomer from polyester blend fibers using rotary reaction device - Google Patents

Abstract

Provided are a method and a device for recovering a polyester monomer from polyester-based blended fibers using a rotary reaction device. According to an embodiment, the method for recovering a polyester monomer from polyester-based blended fibers using a rotary reaction device comprises: a step of decomposing polyester from blended fibers and converting the same into a polyester monomer by making the blended fibers including polyester react with a solvent using a rotary reaction device; a step of dehydrating a reactant containing the produced polyester monomer after reaction to separate the same from the remaining fibers; a step of washing the dehydrated fibers with a washing solution; and a step of re-dehydrating the washed fibers. Accordingly, the device cost can be reduced.

Description

METHOD AND APPARATUS FOR RECOVERING POLYESTER MONOMER FROM POLYESTER BLEND FIBERS USING ROTARY REACTION DEVICE}

Embodiments of the present invention relates to a method and apparatus for recovering polyester monomers from polyester-based blend fibers using a rotating reaction device.

In recent years, research on recycling polyester to deplete oil resources and recycle resources has been actively conducted. As a method for recycling the polyester, there is a method for recovering the polyester monomer. The polyester monomer recovery method is a technique of reacting a polyester material with a solvent to cut a polymer chain, convert it to a monomer, and recover it. The well-known polyester monomer recovery technology is a method of selectively separating a polyester material having high purity, reacting with a solvent, converting it to a monomer, and recovering the monomer.

However, in the case of low-grade polyester waste, especially polyester-cotton blended fibers that contain other fibers than polyester fibers, it is difficult to separate the polyester material from the blended fibers and cannot be recycled because it is twisted with cotton fibers. It is being disposed of.

Korean Patent Registration No. 10-1415346 relates to a method for separating and removing dissimilar materials from such polyester fiber wastes, and discloses a technique for recovering an active component from polyester fiber wastes containing polyalkylene terephthalate as a main component. It is described. In this method, a polyester heterogeneous fiber material, a glycol solvent, and a catalyst are introduced into a reactor and reacted to convert a polyester material into a monomer to produce a reactant, and a fiber that is not reacted with the produced reactant is transferred to a separation device and compressed and dehydrated. It is a method of separating liquid monomers from fibers.

However, the prior art requires a separate device for separating the unreacted fibers other than the reactor, and thus the device is expensive, and the dehydration power is low because the unreacted fibers are compressed to separate the liquid reactants. Has its drawbacks. In addition, since unreacted fibers escape from the reaction device through the pump, the pump may easily break down. If a stirrer is used in the reactor, the fiber is caught in an impeller, so a stirrer cannot be used to expect a smooth reaction. it's difficult.

Korean Registered Patent 10-1415346

Embodiments of the present invention describe a method and apparatus for recovering a polyester monomer from a polyester-based blend fiber using a rotating reaction device, and more specifically, reacting and providing a method for recovering a polyester monomer from a blend fiber using a rotary reaction device. Provides techniques that include separation process conditions.

Embodiments of the present invention provides a process and reaction conditions using a rotary reaction apparatus including a drum with a large amount of pores (pore) to decompose the polyester by reacting the blend fiber containing polyester with a solvent to decompose the monomer It is to provide a method and apparatus for recovering polyester monomers from polyester-based blend fibers using a rotating reaction apparatus that facilitates dehydration and reaction of fibers using a rotational force while reducing apparatus cost by converting and separating furnaces.

The method for recovering a polyester monomer from a polyester-based blend fiber using a rotary reaction device according to an embodiment of the present invention is performed by reacting a blend fiber containing polyester with a solvent using a rotary reaction device. Degrading the polyester from the blend fibers and converting it to a polyester monomer; After the reaction, dehydrating the resulting reactant containing the polyester monomer to separate it from the remaining fibers; Washing the dehydrated fibers with a washing solution; And re-dewatering the washed fibers.

Here, the rotation reaction device may include a rotatable drum having a large amount of pores.

The step of decomposing polyester from the blended fiber and converting it into a polyester monomer includes: introducing a blended fiber containing polyester into a rotatable drum of the rotary reaction device; And introducing a solvent into the drum and rotating the drum to decompose polyester from the blend fiber and convert it into a polyester monomer by reacting the blend fiber with the solvent.

In the step of decomposing polyester from the blend fiber and converting it to a polyester monomer, the weight ratio of the glycol-based solvent to the blend fiber containing the polyester is 1: 0.1 to 1:10, and the weight of the acetate-based catalyst PET mass is It is possible to react while maintaining the temperature in the rotary reaction device at 60 to 300 ° C. while rotating the drum of the rotary reaction device at a speed of 5 to 100 rpm in accordance with 0.1-10%.

In the step of dehydrating the reactant containing the polyester monomer to separate it from the remaining fibers, after the reaction, the reactant containing the polyester monomer is drained, and the drum of the rotary reaction device is rotated to obtain a moisture content of the fiber. It can be dehydrated to 10 to 80%.

In the washing of the dehydrated fiber with a washing solution, water is added to the drum of the rotary reaction device containing the dehydrated fiber and the drum is rotated at a speed of 5 to 100 rpm while washing at a temperature of 15 to 60 ° C. have.

In the step of re-dehydrating the washed fibers, after washing, the washing material is drained, and the drum of the rotary reaction device is rotated to dehydrate the fibers to a water content of 10 to 80%.

After re-dehydrating the washed fibers, the re-dehydrated fibers may be further removed from the drum of the rotary reaction device and dried.

The polyester monomer recovery device from the polyester-based blend fiber using the rotary reaction device according to another embodiment of the present invention, as the blend fiber containing the polyester reacts with the solvent using a rotary reaction device. A reaction unit that decomposes polyester from the blended fiber and converts it into a polyester monomer; After the reaction, a first dehydration unit for dehydration to separate the resulting reactant containing the polyester monomer from the remaining fibers; A washing unit for washing the dehydrated fibers with a washing solution; And it may be made of a second dehydration unit for re-dehydrating the washed fibers.

Here, the rotation reaction device may include a rotatable drum having a large amount of pores.

The reaction unit, after the blend fiber containing the polyester into the rotatable drum of the rotary reaction device, and then injecting a solvent in the drum, and rotating the drum to react the blend fiber and the solvent as the reaction The polyester can be decomposed from the blend fibers to convert it into a polyester monomer.

The reaction unit, the weight ratio of the glycol-based solvent compared to the blend fiber containing the polyester is 1: 0.1 to 1:10, and the acetate (acetate) catalyst is 0.1 to 10% of the mass of the PET drum of the rotary reaction device. It can be reacted while rotating at a speed of 100 to 100 rpm while maintaining the temperature in the rotary reaction device at 60 to 300 ° C.

The first dehydration unit, after the reaction, can drain the reactant containing the polyester monomer, and rotate the drum of the rotary reaction device to dehydrate the fiber to a water content of 10 to 80%.

The washing unit may be washed at a temperature of 15 to 60 ° C. while introducing water into the drum of the rotary reaction device containing the dehydrated fibers and rotating the drum at a speed of 5 to 100 rpm.

The second dehydration unit may drain the washing water after washing, and dehydrate the fiber to have a water content of 10 to 80% by rotating the drum of the rotary reaction device.

According to the embodiments of the present invention, by providing a process and reaction conditions using a rotary reaction device including a drum having a plurality of pores (pore), the polyester fibers are decomposed by reacting the blended fiber containing the solvent with a solvent. It is possible to provide a method and apparatus for recovering a polyester monomer from a polyester-based blend fiber using a rotating reaction apparatus that facilitates fiber dehydration and reaction using a rotational force while reducing device cost by making it possible to convert and separate into a monomer. .

In addition, according to embodiments of the present invention, as a rotary reaction device having a plurality of pores is used, a dehydration device is not required separately, and thus the cost of the device is low, and the dehydration power is compressed because the fiber is dewatered by the rotational force. It is more excellent, and it is unnecessary to use a pump because it reacts in a rotary reaction device and separates the solution, and the method for recovering polyester monomers from polyester-based blend fibers using a rotary reaction device that does not require a stirrer because the drum rotates and reacts And devices.

Accordingly, the polyester monomer can be effectively recovered from the blended fibers, and unreacted fibers can be recycled through secondary processing.

1 is a view for explaining a polyester monomer recovery device from a polyester-based blend fiber using a rotary reaction device according to an embodiment of the present invention.
2 is a flowchart for explaining a method for recovering a polyester monomer from a polyester-based blend fiber using a rotating reaction device according to an embodiment of the present invention.
3 is a view for explaining a rotation reaction device according to an embodiment of the present invention.
4 is a view for explaining a method for recovering a polyester monomer from a polyester-based blend fiber using a rotating reaction device according to an embodiment of the present invention.
5 is a view showing the results of the surface analysis of the blend fibers according to an embodiment of the present invention.
Figure 6 shows the results of the monomer extraction analysis from the reactants produced after the reaction according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the described embodiments may be modified in various other forms, and the scope of the present invention is not limited by the embodiments described below. In addition, various embodiments are provided to more fully describe the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for a more clear description.

The present invention relates to a method for recovering a polyester monomer from a polyester-based blended fiber using a rotating reaction device, and by providing a method for recovering a polyester monomer from a blended fiber using a rotating reaction device, it is possible to reduce the device cost and dewater fibers using a rotating force. And can facilitate the reaction.

1 is a view for explaining a polyester monomer recovery device from a polyester-based blend fiber using a rotating reaction device according to an embodiment of the present invention.

The polyester monomer recovery device from the polyester-based blend fiber using the rotational reaction device according to an embodiment will be continuously described below.

Referring to FIG. 1, the polyester monomer recovery device 100 from a polyester-based blend fiber using a rotating reaction device according to an embodiment includes a reaction unit 110, a first dehydration unit 120, and a washing unit 130 And a second dehydration unit 140. In addition, according to the embodiment, the polyester monomer recovery device 100 from the polyester-based blend fiber using a rotating reaction device may further include a processing unit 150.

The reaction unit 110 can be converted into a polyester monomer by decomposing polyester from the blend fiber 10 by reacting the blend fiber 10 containing polyester with a solvent using a rotating reaction device. have. That is, the reaction unit 110 may separate the polyester-based blend fibers 10 into polyester monomers and unreacted fibers 11.

Here, the rotation reaction device may include a rotatable drum with a plurality of pores. A rotatable drum can help to react with the solvent, and a dehydration process can be enabled through a number of pores formed in the drum.

After the reaction of the first dehydration unit 120, the reactant in a liquid state may be separated from the dissimilar material by dehydrating the reactant containing the produced polyester monomer from the remaining fibers.

The washing unit 130 washes the dehydrated fibers with a washing solution, so that the remaining fibers that are not reacted through the washing process can be washed clean. Here, for example, water or the like may be used as the washing liquid.

The second dewatering unit 140 not only effectively recovers the polyester monomer from the blended fibers 10 by re-dehydrating the washed fibers, but also recycles unreacted unreacted fibers 11 through secondary processing. I can make it possible.

Accordingly, the processing unit 150 may recycle unreacted fibers 11 that are not reacted through secondary processing.

According to the embodiments, after converting the polyester into a monomer by a chemical method, it can be used in the production of a polymer product using it (raw material). In addition, a fiber product may be produced using unreacted fibers 11 (eg, cotton fibers) obtained after the separation process (fiber processing).

As described above, the polyester monomer recovery device 100 from the polyester-based blend fiber using a rotational reaction device is a technology for recovering and recycling the used and discarded polyester waste into a monomer by a chemical method. According to embodiments, when the polyester monomer is recovered from the blended fiber 10, resource loss and environmental problems can be effectively reduced because the blended fiber 10 that is disposed of in a large amount can be recycled.

2 is a flowchart for explaining a method for recovering a polyester monomer from a polyester-based blend fiber using a rotating reaction device according to an embodiment of the present invention.

Referring to Figure 2, the method for recovering the polyester monomer from the polyester-based blend fiber using a rotating reaction device according to an embodiment, the polyester (polyester) mixed fiber reacts with a solvent using a rotating reaction device Decomposing the polyester from the blend fibers according to the step of converting to a polyester monomer (S110), after the reaction, dehydrating step (S120), dehydrating to separate the reactant containing the produced polyester monomer from the remaining fibers Washing the fibers with a washing solution (S130), and may be made including a step of re-dehydrating the washed fibers (S140).

Here, in the step (S110) of decomposing polyester from the blend fiber and converting it to a polyester monomer, the step of introducing a blend fiber containing polyester into a rotatable drum of a rotary reaction device, and introducing a solvent into the drum, Rotating the drum can be made by including the step of converting a polyester monomer by decomposing the polyester from the blend fibers as the reaction between the blend fibers and the solvent.

In addition, the method for recovering the polyester monomer from the polyester-based blend fiber using a rotating reaction device may further include drying the re-dehydrated fibers after re-dehydrating the washed fibers.

In addition, the method for recovering the polyester monomer from the polyester-based blend fiber using a rotating reaction device may further include a step of drying the rehydrated fiber and recycling it through secondary processing.

The method for recovering the polyester monomer from the polyester-based blended fiber using the rotating reaction device according to the embodiment is better than through the polyester monomer-recovering device from the polyester-based blended fiber using the rotary reaction device according to one embodiment described in FIG. 1. It can be explained specifically. As described above, the polyester monomer recovery device from the polyester-based blend fiber using the rotating reaction device according to an embodiment may include a reaction unit, a first dehydration unit, a washing unit, and a second dehydration unit. In addition, it may further include a processing unit.

In step (S110), the reaction unit may be converted to a polyester monomer by decomposing polyester from the blend fiber by reacting a blend fiber containing polyester with a solvent using a rotating reaction device. For example, the blend fiber containing the polyester may be a blend fiber containing 5 to 80% of the polyester.

As described above, the rotating reaction device may include a rotatable drum, and a large amount of pores may be formed in the drum.

More specifically, after the reaction unit is introduced into a blended fiber containing polyester into a rotatable drum of a rotary reaction device, a solvent is introduced into the drum and the drum is rotated to react the blended fiber with a solvent to react the blended fiber with polyester. It can be decomposed to convert to a polyester monomer.

In this case, the reaction part has a glycol-based solvent mass ratio of 1: 0.1 to 1:10 compared to the blend fiber containing polyester, and is adjusted to 0.1 to 10% of the mass of the acetate-based catalyst PET to set the drum of the rotary reaction device to 5 to While rotating at a speed of 100 rpm, it is possible to react while maintaining the temperature in the rotating reaction device at 60 to 300 ° C.

In step S120, after the reaction, the first dehydration unit may be dehydrated to separate the reactant containing the produced polyester monomer from the remaining fibers.

After the reaction of the first dehydration unit, the reactant containing the polyester monomer is drained, and the drum of the rotating reaction device is rotated to dehydrate the fiber so that the water content is 10 to 80%.

In step S130, the washing unit may wash the dehydrated fibers with a washing solution.

The washing unit may wash water at a temperature of 15 to 60 ° C. while adding water to the drum of a rotary reaction device containing dehydrated fibers and rotating the drum at a speed of 5 to 100 rpm.

In step S140, the second dewatering unit may rehydrate the washed fibers.

After washing, the second dehydration unit may drain the washing water, and dehydrate the fiber so that the water content of the fiber is 10 to 80% by rotating the drum of the rotary reaction device.

In addition, after re-dehydrating the washed fibers, in step S150, the second dehydration unit or a separate drying unit may dry the re-dehydrated fibers. In one example, a separate drying unit may remove the re-dehydrated fibers from the drum of the rotary reaction device and then dry them. As another example, the second dehydration unit may rehydrate the fibers and then dry the fibers through a drying function.

After drying the rehydrated fiber, in step S160, the processing unit may recycle the dried unreacted fiber through secondary processing. Here, the rehydrated fibers may mean unreacted fibers that are not reacted, in which polyester monomers are recovered from the blended fibers. In addition, the processed portion can be used as a raw material for the recovered polyester monomer. That is, the recovered polyester monomer can be used as a raw material to be used in the production of polymer products.

According to embodiments, it is possible to provide a method of converting and separating polyester into a monomer by reacting a blend fiber containing polyester by rotating a drum containing a plurality of pores. By rotating the drum, there is an effect that the polyester and the reaction solution are mixed smoothly, and the drum has a large number of pores, and after the reaction, the drum can be rotated to efficiently dehydrate the fibers.

In addition, since the reaction and washing process is performed in one device, the cost of the device is reduced, and a pump for transferring the reactants is not required, and a separate stirring device in the reactor is also not required.

3 is a view for explaining a rotation reaction apparatus according to an embodiment of the present invention.

Referring to Figure 3, schematically showing a rotary reaction device according to an embodiment, the rotary reaction device may include a rotatable drum 310. A plurality of pores 311 may be configured in the drum 310, and may be rotated around the rotating shaft 312. .

The blend fiber containing polyester is introduced into the drum 310, and can be mixed smoothly as it rotates with a solvent, and is reacted by a number of pores 311 of the drum 310. After that, the drum 310 can be rotated to efficiently dehydrate the fibers.

In addition, as shown in FIG. 4 to be described later, the rotary reaction device may further include an inlet 420 through which a solvent and a washing solution for reaction are input, and a drain 430 for draining the reactants and washing products.

4 is a view for explaining a method for recovering a polyester monomer from a polyester-based blend fiber using a rotating reaction device according to an embodiment of the present invention.

Referring to Figure 4 (a), after the polyester-based blend fiber is introduced into the drum, the reaction solution (solvent) is introduced through the inlet 420 and the drum 410 is rotated to react the blend fiber with a solvent. Can be converted to polyester monomers. Accordingly, the polyester-based blend fibers can be separated into polyester monomers and unreacted fibers.

Referring to FIG. 4 (b), after the reaction, the reactant is dehydrated through the drain 430, and the solution contained in the fiber is separated and rotated through the rotation of the drum 410 composed of a plurality of pores 411, and It can be dehydrated.

Referring to FIG. 4 (c), after dehydration, a washing solution (for example, water, etc.) is injected through the inlet 420 and then the drum 410 is rotated to wash unreacted fibers.

Referring to FIG. 4 (d), after washing, the washing water is dehydrated through the drain hole 430, and the solution contained in the fiber can be separated and dehydrated through rotation of the drum 410.

As described above, according to the method for recovering the polyester monomer from the polyester-based blend fiber using the rotational reaction device proposed in the present invention, the mixed fiber is introduced into the reaction device, and then mixed by mixing the drum 410 through the reaction process (mixing) ) Is made smoothly, the polyester reacts with the solvent under the influence of the catalyst to convert it to a monomer, and the reactant in a liquid state is separated from the dissimilar material through the first dehydration process, and the remaining fibers that are not reacted through the washing process are washed clean. By dehydrating the fibers washed through the second dehydration process, polyester monomers can be effectively recovered from the blended fibers, and unreacted fibers can be recycled through secondary processing.

Hereinafter, the present invention will be described through one embodiment.

In order to show the feasibility of the method proposed in the embodiment of the present invention, a batch-type rotation reaction device is used, and cotton-polyester blend fibers are inserted into a drum containing a large number of pores and reacted with a glycol-based solvent to produce poly An experiment was conducted in which the ester was converted to a monomer and recovered.

Example

4 kg of blend fiber composed of 65% cotton and 65% polyester and 26 g zinc acetate catalyst are placed in a 40L drum with a large number of pores, and the input of the batch rotary reactor is closed. As a reaction solvent, ethylene glycol 2 L, a glycol-based solvent, is preheated to a temperature of 60 ° C. and then introduced into a rotary reaction device.

Thereafter, while rotating the drum at 30 to 50 rpm through the reaction process, the blend fiber is reacted with the solvent for 5 hours while maintaining the temperature in the reaction device at 95 ° C.

After the reaction, the liquid reactant is separated from unreacted fibers and dehydrated while the drum is rotated at 1.200 to 1,500 rpm through a first dehydration process.

Thereafter, water is introduced into the rotary reaction device through a washing process, and then the unreacted fibers are washed while rotating at 30 to 50 rpm.

After washing, the washed fibers are dehydrated while the drum is rotated at 1,200 to 1,500 rpm through a second dehydration process. The dehydrated fibers were taken out of the reaction apparatus and dried at a temperature of 70 ° C for 5 hours.

As a result of conducting the surface analysis of the sample using an electron microscope to verify the performance of the proposed technology, it was confirmed that the cotton fibers remained unreacted and the polyester fibers were converted to monomers to decompose, and the recovered liquid BHET monomer was extracted from the reaction product, and it was confirmed as a polyester monomer through DSC, TGA, and NMR analysis.

In the examples, the fiber material can be easily separated through a relatively simple reaction process, and since it is separated using a glycol-based solvent, it has very little toxicity and is easily soluble in water, so it can be easily washed. It is applicable to.

5 is a view showing the results of the surface analysis of the blend fibers according to an embodiment of the present invention.

5 shows an image of the surface of the blended fiber measured by an electron microscope through an embodiment, (a) shows the surface of the blended fiber before the reaction, and (b) shows the surface of the blended fiber after the reaction for 2.5 hours. , (c) shows the surface of the blended fiber after the reaction for 5 hours. And (d) shows a magnified portion A of the surface of the blended fiber after the reaction for 2.5 hours, it is possible to confirm the decomposed polyester 510 and the unreacted cotton fiber 520.

Through the examples, it can be seen that the polyester material of the blend fiber disappears due to decomposition, and the cotton fiber remains unreacted.

Figure 6 shows the results of the monomer extraction analysis from the reactants produced after the reaction according to an embodiment of the present invention.

When the PET material reacts with ethylene glycol (EG), BHET monomer is produced. In order to verify the monomers produced through the examples, the monomers must be separated from the reactants.

As shown in Figure 6, it can be confirmed by extracting the monomer from the reactants recovered through the examples and analyzing. It was confirmed through DSC analysis that the BHET monomer peak appeared at 114 ° C. In the TGA analysis, it was confirmed that the BHET monomer was decomposed at a temperature of 210 ° C and the BHET monomer was thermally polymerized at a temperature of 400 ° C to decompose the resulting PET. there was. In addition, the material extracted from the reaction was confirmed as a BHET monomer through NMR analysis (H-NMR, C-NMR).

The method for recovering the polyester monomer from the existing blend fibers requires a separate device for separating unreacted fibers other than the reactor, and has a low dehydration power because it separates the liquid reactants by compressing the unreacted fibers by compression dehydration. Has its drawbacks. In addition, there is a problem in that the pump easily breaks down because unreacted fibers escape from the reaction device through the pump, and there is a problem in that the reaction is not smooth because the stirrer in the reactor cannot be used.

According to the embodiments of the present invention, by providing a process and reaction conditions using a rotating reaction device including a drum with a large amount of pores (pore), the polyester fibers are decomposed by reacting the blended fiber containing the solvent with a solvent. By converting and separating them into monomers, it is possible to effectively recycle blended fibers by applying them to the textile, recycling, and raw materials industries.

Moreover, the polyester monomer recovery technology through the examples is applied to other types of polyester such as 100% polyester fiber, non-fiber film, as well as blend fibers containing polyester, such as cotton-polyester, which is most frequently used. By doing so, the polyester monomer can be recovered.

The device described above may be implemented with hardware components, software components, and / or combinations of hardware components and software components. For example, the devices and components described in the embodiments include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor (micro signal processor), a microcomputer, a field programmable array (FPA), It may be implemented using one or more general purpose computers or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may run an operating system (OS) and one or more software applications running on the operating system. In addition, the processing device may access, store, manipulate, process, and generate data in response to the execution of the software. For convenience of understanding, a processing device may be described as one being used, but a person having ordinary skill in the art, the processing device may include a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that may include. For example, the processing device may include a plurality of processors or a processor and a controller. In addition, other processing configurations, such as parallel processors, are possible.

The software may include a computer program, code, instruction, or a combination of one or more of these, and configure the processing device to operate as desired, or process independently or collectively You can command the device. Software and / or data may be interpreted by a processing device, or to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. Can be embodied in The software may be distributed over networked computer systems, and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiments or may be known and usable by those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, and magnetic media such as floptical disks. -Hardware devices specifically configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language code that can be executed by a computer using an interpreter, etc., as well as machine language codes produced by a compiler.

As described above, although the embodiments have been described by a limited embodiment and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques are performed in a different order than the described method, and / or the components of the described system, structure, device, circuit, etc. are combined or combined in a different form from the described method, or other components Alternatively, even if substituted or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (15)

Decomposing polyester from the blend fibers and converting them into polyester monomers by reacting the blend fibers containing polyester with a solvent using a rotating reaction device;
After the reaction, dehydrating the resulting reactant containing the polyester monomer to separate it from the remaining fibers;
Washing the dehydrated fibers with a washing solution; And
Re-dehydrating the washed fibers
The method of recovering a polyester monomer from a polyester-based blend fiber comprising a. According to claim 1,
The rotation reaction device,
Comprising a rotatable drum having a large amount of pores
Characterized in that, the method for recovering the polyester monomer from the polyester-based blend fibers. According to claim 1,
The step of decomposing polyester from the blend fiber and converting it to a polyester monomer,
Inputting a blend fiber containing polyester into a rotatable drum of the rotary reaction device; And
Injecting a solvent into the drum, and rotating the drum to decompose polyester from the blended fiber by reacting the blended fiber with the solvent to convert to a polyester monomer.
The method of recovering a polyester monomer from a polyester-based blend fiber comprising a. According to claim 1,
The step of decomposing polyester from the blend fiber and converting it to a polyester monomer,
The weight ratio of the glycol-based solvent to the blend fiber containing the polyester is 1: 0.1 to 1:10, and is adjusted to 0.1 to 10% of the mass of the acetate-based catalyst PET, and the drum of the rotary reaction device is 5 to 100 rpm. React while maintaining the temperature in the rotary reaction device while rotating to 60 to 300 ℃
Characterized in that, the method for recovering the polyester monomer from the polyester-based blend fibers. According to claim 1,
The step of dehydrating the reactant containing the polyester monomer to separate it from the remaining fibers,
After the reaction, the reactant containing the polyester monomer is drained and dehydrated so that the water content of the fiber is 10 to 80% by rotating the drum of the rotary reaction device.
Characterized in that, the method for recovering the polyester monomer from the polyester-based blend fibers. According to claim 1,
Washing the dehydrated fiber with a washing solution,
Water is added to the drum of the rotary reaction device containing the dehydrated fibers and washed at a temperature of 15 to 60 ° C while rotating the drum at a speed of 5 to 100 rpm.
Characterized in that, the method for recovering the polyester monomer from the polyester-based blend fibers. According to claim 1,
The step of re-dehydrating the washed fiber,
After washing, the washing material is drained, and the drum of the rotary reaction device is rotated to dehydrate the fiber to a water content of 10 to 80%.
Characterized in that, the method for recovering the polyester monomer from the polyester-based blend fibers. According to claim 1,
Drying the re-dehydrated fibers after re-dehydrating the washed fibers; And
After drying the rehydrated fiber, recycling through secondary processing
Further comprising, a method for recovering a polyester monomer from the polyester-based blend fibers. A reaction unit that decomposes polyester from the blended fiber and converts it into a polyester monomer by reacting a blended fiber containing polyester with a solvent using a rotating reaction device;
After the reaction, a first dehydration unit for dehydration to separate the resulting reactant containing the polyester monomer from the remaining fibers;
A washing unit for washing the dehydrated fibers with a washing solution; And
A second dehydration unit for re-dehydrating the washed fibers
A polyester monomer recovery device from the polyester-based blend fibers comprising a. The method of claim 9,
The rotation reaction device,
Comprising a rotatable drum with a large amount of pores
Characterized in that, the polyester monomer recovery device from the polyester-based blend fibers. The method of claim 9,
The reaction unit,
After the blend fiber containing polyester is introduced into the rotatable drum of the rotary reaction device, a solvent is introduced into the drum, and the drum is rotated to react the blend fiber with the solvent to produce poly from the blend fiber. To break down esters and convert them to polyester monomers
Characterized in that, a polyester monomer recovery device from the polyester-based blend fibers. The method of claim 9,
The reaction unit,
The weight ratio of the glycol-based solvent to the blend fiber containing the polyester is 1: 0.1 to 1:10, and is adjusted to 0.1 to 10% of the mass of the acetate-based catalyst PET, and the drum of the rotary reaction device is 5 to 100 rpm. React while maintaining the temperature in the rotary reaction device while rotating to 60 to 300 ℃
Characterized in that, the polyester monomer recovery device from the polyester-based blend fibers. The method of claim 9,
The first dehydration unit,
After the reaction, the reactant containing the polyester monomer is drained and dehydrated so that the water content of the fiber is 10 to 80% by rotating the drum of the rotary reaction device.
Characterized in that, the polyester monomer recovery device from the polyester-based blend fibers. The method of claim 9,
The washing unit,
Water is added to the drum of the rotary reaction device containing the dehydrated fibers and washed at a temperature of 15 to 60 ° C while rotating the drum at a speed of 5 to 100 rpm.
Characterized in that, the polyester monomer recovery device from the polyester-based blend fibers. The method of claim 9,
The second dehydration unit,
After washing, the washing material is drained, and the drum of the rotary reaction device is rotated to dehydrate the fiber to a water content of 10 to 80%.
Characterized in that, the polyester monomer recovery device from the polyester-based blend fibers.

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