Method for recycling waste textile alcoholysis ethylene glycol through photocatalysis

Abstract

The invention discloses a method for recycling waste textile alcoholysis ethylene glycol by photocatalysis, which comprises the following steps: sequentially conveying an input ethylene glycol solution through pipelines, treating the ethylene glycol solution through a light component removal tower, a primary distillation tower and a rectifying tower, and pumping the ethylene glycol solution into a first ethylene glycol storage tank for storage; an ethylene glycol solution in the ethylene glycol first storage tank is pumped into the photocatalysis device to be subjected to photocatalysis treatment, and the obtained treatment liquid is pumped into the ethylene glycol second storage tank to be stored. The three devices can remove light-component substances, low-boiling-point substances and heavy-component substances in the recovered ethylene glycol solution, then the ethylene glycol solution enters the photocatalysis device, and regenerated ethylene glycol is subjected to decoloration and impurity removal through a photocatalysis chemical means, so that the quality of the regenerated ethylene glycol is remarkably improved, and the recovery rate of the regenerated ethylene glycol is improved. The regenerated ethylene glycol prepared by the method has the advantages of good quality and high market value, and can bring good economic benefits to enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of chemical recycling regeneration of waste textiles, and more specifically to a method for recycling alcoholysis ethylene glycol from waste textiles by utilizing photocatalysis. Background Art

[0002] The chemical recycling technology for waste textiles uses waste textiles as raw materials, and undergoes processes such as ethylene glycol alcoholysis and depolymerization into BHET, removal of foreign materials, methanol ester exchange, DMT crystallization, centrifugal separation, and DMT distillation to produce recycled DMT (dimethyl terephthalate), and then uses the recycled DMT as raw material to make PET polyester chips, polyester yarns and other engineering plastics.

[0003] In the actual production process of chemical recycling technology for waste textiles, a large amount of ethylene glycol will be produced during the depolymerization reaction. Ethylene glycol, as a by-product produced in the chemical recycling process for waste textiles, can be recycled (ethylene glycol will be used to make solvents involved in the reaction, pipeline flushing, etc., and can also be sold), which will bring certain economic benefits to the company and reduce production costs. However, in the recycling process, it was found that the recycled ethylene glycol carries dyes, metal salts and other impurities in the waste textiles. These ethylene glycols are often colored. In the process of recycling and reusing ethylene glycol, the colored ethylene glycol needs to be further purified and decolorized, otherwise it cannot be sold at the market price and cannot generate economic benefits. Summary of the invention

[0004] The purpose of the present invention is to solve the needs of the above-mentioned prior art and provide a method for recycling ethylene glycol from waste textiles by using photocatalysis. The method uses photocatalytic chemical means to decolorize and remove impurities from the regenerated ethylene glycol, thereby significantly improving the quality of the regenerated ethylene glycol.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A method for recycling alcoholysis ethylene glycol from waste textiles by using photocatalysis, comprising the following steps:

[0007] (a) transporting the ethylene glycol solution recovered from the chemical recycling process of waste textiles to an ethylene glycol recovery system through a pipeline, wherein the ethylene glycol solution is first transported through a pipeline to a lightness removal tower, a primary distillation tower, and a rectifying tower, and then pumped into a first ethylene glycol storage tank for storage and waiting for the next production step;

[0008] (b) pumping the ethylene glycol solution stored in the first ethylene glycol storage tank into a photocatalytic device, the photocatalytic device comprising a catalyst, the ethylene glycol solution being transported through the catalyst, a photocatalytic component being installed in the catalyst, a photocatalytic component being attached with a photocatalyst, a circle of catalytic lamps being installed around the catalyst, the catalytic lamps being used as a light source to illuminate the photocatalytic component, the photocatalyst on the photocatalytic component undergoing internal energy level transitions when exposed to light, causing an oxidation-reduction reaction of impurities, dyes, etc. in the ethylene glycol solution, thereby achieving an impurity removal and decolorization effect;

[0009] (c) The photocatalytic device removes impurities and color from the ethylene glycol solution to produce refined ethylene glycol, which is then pumped into a second ethylene glycol storage tank for storage.

[0010] Furthermore, the light removal tower and the primary distillation tower in step (a) are atmospheric distillation towers, and the rectifying tower is a vacuum distillation tower.

[0011] Furthermore, the bottom temperature of the light-removing tower is set to 180-200° C., the top temperature of the light-removing tower is set to 65° C., the bottom of the light-removing tower outputs ethylene glycol solution, and the top of the light-removing tower produces light component substances mainly consisting of methanol.

[0012] Furthermore, the bottom temperature of the primary distillation tower is set to 180-200°C, the top temperature of the primary distillation tower is set to 160°C, low-boiling substances such as water, ethers, aldehydes, etc. are extracted from the top of the primary distillation tower, and ethylene glycol solution is output from the bottom of the primary distillation tower.

[0013] Furthermore, the bottom temperature of the distillation tower is set to 160-170° C., and ethylene glycol is extracted from the top of the distillation tower through reduced pressure distillation for subsequent production, and heavy components are discharged from the bottom of the distillation tower.

[0014] Furthermore, the photocatalytic component in step (b) includes a fixing rod and a catalyst carrier, the catalyst carrier body is a non-woven fabric, the catalyst carrier is mounted on the fixing rod, a photocatalyst is attached to the catalyst carrier, and the photocatalyst is titanium dioxide.

[0015] Furthermore, a filter is installed on the pumping pipeline between the photocatalytic device and the second ethylene glycol storage tank.

[0016] The beneficial effects of the present invention are:

[0017] The present invention first allows the recovered ethylene glycol solution to pass through a light-removing tower, a primary distillation tower and a rectifying tower in sequence. The three devices can remove light components, low-boiling-point substances and heavy components in the recovered ethylene glycol solution. Then the ethylene glycol solution is sent to a photocatalytic device to decolorize and remove impurities from the regenerated ethylene glycol through photocatalytic chemical means, thereby significantly improving the quality of the regenerated ethylene glycol. The regenerated ethylene glycol prepared by the present invention has the advantages of good quality and high market value, and can bring good economic benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of an ethylene glycol recovery system in this embodiment;

[0019] Figure 2 is a schematic diagram of the internal structure of the photocatalytic device in this embodiment;

[0020] Figure 3 is a top view of the water wheel mechanism in this embodiment;

[0021] Figure 4 It is a top view of the linkage turntable in this embodiment.

[0022] Figure numerals: lightness removal tower 1, primary distillation tower 2, distillation tower 3, first ethylene glycol storage tank 4, photocatalytic device 5, outer shell 51, liquid storage area 511, liquid level indicator 512, catalytic liquid inlet 513, catalytic liquid outlet 52, catalyst 53, photocatalytic component 531, fixing rod 5311, catalyst carrier 5312, water wheel mechanism 532, disc drum body 5321, wheel axle 5322, blade 5323, water wheel liquid inlet 5324, screw handle 5325, catalytic tank 533, discharge port 5331, exhaust port 5332, stirring reaction mechanism 534, stirring shaft 5341, linkage turntable 5342, discharge through hole 5343, catalytic lamp 54, annular seat 55, lamp ring 551, second ethylene glycol storage tank 6, filter 7. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] A method for recycling alcoholysis ethylene glycol from waste textiles by using photocatalysis, comprising the following steps:

[0025] (a) The ethylene glycol solution recovered from the chemical recycling process of waste textiles is transported to an ethylene glycol recovery system through a pipeline. The ethylene glycol solution is first transported through a pipeline to a light-removing tower 1, a primary distillation tower 2, and a rectifying tower 3 for treatment, and then pumped into an ethylene glycol first storage tank 4 for storage and waiting for the next production step. The light-removing tower 1 and the primary distillation tower 2 are atmospheric distillation towers, and the rectifying tower 3 is a vacuum distillation tower. The bottom temperature of the light-removing tower 1 is set to 180-200°C, and the top temperature of the light-removing tower 1 is set to 65°C. The light-removing tower 1 is mainly used to remove light components in the recovered ethylene glycol solution. The light components are mainly composed of methanol. The light components are extracted from the top of the light-removing tower 1, and the treated ethylene glycol solution is output from the bottom of the light-removing tower 1. The bottom pipeline of the light-removing tower 1 is connected to the primary distillation tower 2. The bottom temperature of the primary distillation tower 2 is set to The temperature of the primary distillation tower 2 is set to 180-200°C, the top of the primary distillation tower 2 is set to 160°C, the primary distillation tower 2 is responsible for completing the removal of low-boiling substances in the recovered ethylene glycol solution, and low-boiling substances such as water, ethers, and aldehydes are extracted from the top of the primary distillation tower 2. The treated ethylene glycol solution is output from the bottom of the primary distillation tower 2. The bottom pipeline of the primary distillation tower 2 is connected to the distillation tower 3. The bottom temperature of the distillation tower 3 is set to 160-170°C. The distillation tower 3 is responsible for completing the removal of heavy components in the recovered ethylene glycol solution. The distillation tower 3 adopts a vacuum distillation method to extract ethylene glycol at the top of the distillation tower 3 for subsequent production, and the heavy components are discharged at the bottom of the distillation tower 3. The top pipeline of the distillation tower 3 is connected to the first ethylene glycol storage tank 4. The ethylene glycol solution in the first ethylene glycol storage tank 4 has been removed one by one by light components, low-boiling substances, and heavy components;

[0026] (b) The ethylene glycol solution stored in the first ethylene glycol storage tank 4 is pumped into the photocatalytic device 5, the photocatalytic device 5 includes a catalyst 53, the ethylene glycol solution is transported through the catalyst 53, a photocatalytic component 531 is installed in the catalyst 53, a photocatalyst is attached to the photocatalytic component 531, the ethylene glycol solution in the catalyst 53 can contact with the photocatalyst attached to the photocatalytic component 531, a circle of catalytic lamps 54 are installed on the periphery of the catalyst 53, the catalytic lamps 54 can be used as a light source to irradiate the photocatalytic component 531, the photocatalyst on the photocatalytic component 531 will undergo internal energy level transition when exposed to light, so that impurities, dyes, etc. in the ethylene glycol solution undergo oxidation-reduction reaction, thereby achieving the effect of removing impurities and color. The photocatalytic component 531 includes a fixing rod 5311 and a catalyst carrier 5312. The main body of the catalyst carrier 5312 is a non-woven fabric, and the photocatalyst is easily attached to the non-woven fabric (catalyst carrier 5312). The catalyst carrier 5312 is installed on the fixing rod 5311, and the fixing rod 5311 plays a role in fixing the carrier. The photocatalyst uses titanium dioxide (commercial P25), and the wavelength of the band gap energy level excitation is in the ultraviolet section. Therefore, the catalytic lamp 54 uses an ultraviolet lamp. The ultraviolet light emitted by the catalytic lamp 54 is transmitted to the photocatalyst to form an energy level transition, generate photogenerated electrons and photogenerated holes, and thus an oxidation-reduction reaction occurs. The dyes, organic small molecules, etc. in the ethylene glycol solution are oxidized into carbon dioxide and water. The photocatalyst also has pores and has a good adsorption effect on metal ions. Therefore, under the photocatalytic effect, the ethylene glycol solution can be decolorized and impurities can be removed, the quality of ethylene glycol can be improved, and refined ethylene glycol can be made;

[0027] (c) The photocatalytic device 5 removes impurities and colors from the ethylene glycol solution to produce refined ethylene glycol, which is then pumped into the second ethylene glycol storage tank 6 for storage. The refined ethylene glycol stored in the second ethylene glycol storage tank 6 is of high quality. Part of it can be used to make a reaction solvent for the chemical recycling process of waste textiles, and part of it can be used to flush equipment pipes. The greatest use of it is that it can be sold to the outside. Since the refined ethylene glycol is of high quality and has a high market price for sale to the outside, it can bring good economic benefits to the enterprise and effectively reduce production costs.

[0028] like Figure 1 As shown, a filter 7 is installed on the pumping pipeline between the photocatalytic device 5 and the second ethylene glycol storage tank 6. During the photocatalytic reaction, the photocatalyst attached to the catalyst carrier 5312 occasionally falls off in small amounts. These detached photocatalysts are mixed in the ethylene glycol, which will cause the quality of the ethylene glycol to deteriorate. Therefore, a filter 7 is provided on the pipeline that transports the ethylene glycol to the second ethylene glycol storage tank 6 to filter the photocatalyst and prevent it from entering the second ethylene glycol storage tank 6.

[0029] like Figure 1The ethylene glycol recovery system shown in the figure comprises a light-removing tower 1, a primary distillation tower 2, a rectifying tower 3, a first ethylene glycol storage tank 4, a photocatalytic device 5 and a second ethylene glycol storage tank 6. The light-removing tower 1, the primary distillation tower 2, the rectifying tower 3, the first ethylene glycol storage tank 4, the photocatalytic device 5 and the second ethylene glycol storage tank 6 are connected in sequence by pipelines. A filter 7 is installed on the connecting pipeline between the photocatalytic device 5 and the second ethylene glycol storage tank 6. The light-removing tower 1 is mainly used to remove light components in the recovered ethylene glycol solution. The primary distillation tower 2 is responsible for completing the recovery of ethylene glycol. The distillation tower 3 is responsible for removing the low-boiling-point substances in the glycol solution. The distillation tower 3 is responsible for completing the removal of the heavy components in the recovered ethylene glycol solution. The first ethylene glycol storage tank 4 plays the role of relay storage. The ethylene glycol solution after removing the light components, low-boiling-point substances and heavy components is stored in the first ethylene glycol storage tank 4. The photocatalytic device 5 extracts the ethylene glycol solution in the first ethylene glycol storage tank 4 for photocatalytic treatment. The photocatalytic treatment can achieve the effect of removing impurities and color. The refined ethylene glycol finally produced is stored in the second ethylene glycol storage tank 6.

[0030] like Figure 2 The photocatalytic device 5 shown includes an outer shell 51, the outer shell 51 is hollow inside, a liquid storage area 511 is provided in the outer shell 51, a catalytic liquid outlet 52 is provided on the bottom side of the outer shell 51, and the catalytic liquid outlet 52 is connected to the liquid storage area 511. A catalyst 53 is installed on the top of the outer shell 51, and the catalyst 53 is located above the liquid storage area 511. A catalytic liquid inlet 513 is provided on the top of the outer shell 51, and the catalytic liquid inlet 513 is connected to the catalyst 53 through a pipeline. A photocatalytic component 531 is installed in the catalyst 53, and a circle of catalytic lamps 54 are installed around the outside of the catalyst 53. The catalytic liquid inlet 513 introduces ethylene glycol solution pumped from the first ethylene glycol storage tank 4, and the ethylene glycol solution is fed into the catalyst The ethylene glycol solution is in contact with the photocatalytic component 531 in the device 53, and the catalytic lamp 54 continuously irradiates the photocatalytic component 531, causing the energy level transition of the photocatalyst, so that the impurities, dyes, etc. in the ethylene glycol solution undergo oxidation-reduction reactions, thereby achieving the effects of removing impurities and color. The ethylene glycol solution after photocatalytic treatment is naturally output from the catalyst 53 and falls into the liquid storage area 511 for temporary storage. A liquid level meter 512 is installed in the outer shell 51. When the liquid level in the liquid storage area 511 reaches the set value of the liquid level meter 512, the ethylene glycol solution in the liquid storage area 511 will be pumped to the second ethylene glycol storage tank 6. After a series of treatments of the system, the quality of the ethylene glycol is significantly improved, and it can be used or sold as refined ethylene glycol.

[0031] like Figure 2 and Figure 3As shown, the catalyst 53 includes a water wheel mechanism 532 and a catalyst tank 533. The water wheel mechanism 532 includes a drum body 5321 and a wheel shaft 5322. The wheel shaft 5322 is rotatably installed in the drum body 5321. A plurality of blades 5323 are evenly installed on the outer wall of the wheel shaft 5322. A water wheel liquid inlet 5324 is provided on the side wall of the drum body 5321. The water wheel liquid inlet 5324 is connected to the catalyst liquid inlet 513 through a pipeline. The ethylene glycol solution enters the drum body 5321 from the water wheel liquid inlet 5324. The ethylene glycol solution will impact on the blades 5323, forming a rotation effect of the blades 5323 and the wheel shaft 5322. The lower end surface of the drum body 5321 is open. The catalytic tank 533 is connected to the bottom of the drum body 5321 and can receive the ethylene glycol solution falling from the drum body 5321. The photocatalytic component 531 is installed in the catalytic tank 533. A drain port 5331 is provided at the bottom of the catalytic tank 533. The drain port 5331 can output the ethylene glycol solution after photocatalytic treatment. An exhaust port 5332 is provided at the top of the catalytic tank 533. Waste gas will be generated during the photocatalytic reaction, and the waste gas will be discharged to the outside through the exhaust port 5332. The catalytic lamp 54 is installed around the outer periphery of the catalytic tank 533. The catalytic tank 533 is made of light-transmitting material, so that the catalytic lamp 54 can smoothly irradiate the photocatalytic component 531 and successfully complete the photocatalytic treatment.

[0032] like Figure 2 As shown, a stirring reaction mechanism 534 is installed in the catalytic tank 533, and the stirring reaction mechanism 534 includes a stirring shaft 5341, and the stirring shaft 5341 is connected to the lower end of the wheel shaft 5322. The ethylene glycol solution impacts the blade 5323, which can form a rotation effect of the wheel shaft 5322. Under this effect, the stirring shaft 5341 can also rotate accordingly. A plurality of photocatalytic components 531 are evenly connected to the outer wall of the stirring shaft 5341. The photocatalytic component 531 can rotate with the stirring shaft 5341 to form a stirring effect on the ethylene glycol solution entering the catalytic tank 533. The photocatalytic component 531 includes a fixed rod 5311 and a catalyst carrier 5312. The two fixed rods 5311 are connected in parallel to the stirring shaft 5323. On the outer wall of the shaft 5341, a catalyst carrier 5312 is installed and connected to two fixed rods 5311. A photocatalyst is attached to the catalyst carrier 5312. The photocatalytic component 531 plays the role of a stirring blade. Under the stirring action, the photocatalyst and the ethylene glycol solution are fully contacted, which helps to make the photocatalytic reaction fully and efficiently proceed. Since the catalytic lamp 54 is installed in a circle around the catalytic tank 533, the photocatalyst can be irradiated by the catalytic lamp 54 during the stirring and rotating process of the photocatalytic component 531, and the photocatalytic reaction can continue to occur. The bottom of the stirring shaft 5341 is connected to a linkage turntable 5342, and the outer diameter of the linkage turntable 5342 matches the inner diameter of the catalytic tank 533. Figure 4As shown, a drainage hole 5343 is provided on the linkage turntable 5342, and the linkage turntable 5342 rotates together with the stirring shaft 5341. During the rotation of the linkage turntable 5342, the drainage hole 5343 can overlap with the drainage port 5331 at the bottom of the catalyst tank 533. When the drainage hole 5343 overlaps with the drainage port 5331, the ethylene glycol solution can naturally fall from the catalyst 53. Such a structural design allows the ethylene glycol solution to have a retention time in the catalyst tank 533. During the retention time, the ethylene glycol solution is stirred and subjected to photocatalytic treatment.

[0033] like Figure 2 As shown, the wheel shaft 5322 extends upward and is connected to a screw handle 5325. By screwing the screw handle 5325, the wheel shaft 5322 and the stirring reaction mechanism 534 can be manually driven to rotate. When the catalyst 53 stops pumping the ethylene glycol solution, the wheel shaft 5322 and the stirring reaction mechanism 534 will no longer rotate. At this time, since the drainage hole 5343 does not overlap with the drainage port 5331, a portion of the ethylene glycol liquid will remain in the catalyst tank 533. This requires manual rotation of the stirring reaction mechanism 534 to make the drainage hole 5343 overlap with the drainage port 5331, so that the ethylene glycol solution in the catalyst tank 533 is completely discharged. Figure 2 As shown, in the present invention, the catalyst 53 is integrally installed on the top cover of the outer shell 51, and the catalyst 53 can be removed along with the top cover, and the water wheel mechanism 532 and the catalyst tank 533 can be easily separated, so that the catalyst carrier 5312 can be easily disassembled, assembled and replaced.

[0034] like Figure 2 As shown, an annular seat 55 is installed on the inner wall of the outer shell 51 of the present invention, and a lamp ring 551 is fixedly installed on the annular seat 55 by bolts. A plurality of catalytic lamps 54 are evenly installed below the lamp ring 551. The catalytic lamps 54 are installed with a detachable structure so that they can be selected for replacement. Different photocatalyst materials have different characteristics of energy level band gaps. If titanium dioxide (commercial P25) is selected as the photocatalyst, the wavelength of its band gap energy level excitation is in the ultraviolet section, so the catalytic lamp 54 uses an ultraviolet lamp. In actual applications, a photocatalyst with a band gap energy level excitation wavelength in the visible light section can also be selected. At this time, the catalytic lamp 54 uses a halogen lamp or a xenon lamp.

[0035] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for recovering ethylene glycol from waste textiles by using photocatalysis, characterized in that: The steps include: (a), transporting the ethylene glycol solution recovered in the chemical recycling process of waste textiles to an ethylene glycol recovery system through a pipeline, the ethylene glycol solution is first transported through a pipeline to a light removal tower (1), a primary distillation tower (2), and a rectifying tower (3) in sequence, and then pumped into a first ethylene glycol storage tank (4) for storage and waiting for the next production step; (b) pumping the ethylene glycol solution stored in the first ethylene glycol storage tank (4) into the photocatalytic device (5), the photocatalytic device (5) comprising a catalyst (53), the ethylene glycol solution being transported through the catalyst (53), a photocatalytic component (531) being installed in the catalyst (53), a photocatalyst being attached to the photocatalytic component (531), a circle of catalytic lamps (54) being installed around the catalyst (53), the catalytic lamps (54) being used as light sources to illuminate the photocatalytic component (531), the photocatalyst on the photocatalytic component (531) undergoing internal energy level transition when exposed to light, causing an oxidation-reduction reaction of impurities, dyes, etc. in the ethylene glycol solution, thereby achieving the effect of removing impurities and decolorizing; (c) The photocatalytic device (5) removes impurities and color from the ethylene glycol solution to produce refined ethylene glycol, which is then pumped into the second ethylene glycol storage tank (6) for storage.

2. According to claim 1, a method for recovering ethylene glycol from waste textiles by using photocatalysis, characterized in that: The light-removal tower (1) and the primary distillation tower (2) in step (a) are atmospheric distillation towers, and the rectifying tower (3) is a vacuum distillation tower.

3. According to claim 2, a method for recovering ethylene glycol from waste textiles by using photocatalysis, characterized in that: The bottom temperature of the light-removal tower (1) is set to 180-200°C, the top temperature of the light-removal tower (1) is set to 65°C, ethylene glycol solution is output from the bottom of the light-removal tower (1), and light component substances mainly consisting of methanol are extracted from the top of the light-removal tower (1).

4. The method for recovering ethylene glycol from waste textiles by using photocatalysis according to claim 2, characterized in that: The bottom temperature of the primary distillation tower (2) is set at 180-200°C, and the top temperature of the primary distillation tower (2) is set at 160°C. Low-boiling substances such as water, ethers, and aldehydes are extracted from the top of the primary distillation tower (2), and ethylene glycol solution is output from the bottom of the primary distillation tower (2).

5. The method for recovering ethylene glycol from waste textiles by using photocatalysis according to claim 2, characterized in that: The bottom temperature of the distillation tower (3) is set at 160-170°C. Ethylene glycol is extracted from the top of the distillation tower (3) by vacuum distillation for subsequent production, and heavy components are discharged from the bottom of the distillation tower (3).

6. The method for recovering ethylene glycol from waste textiles by using photocatalysis according to claim 1, characterized in that: The photocatalytic component (531) in step (b) includes a fixing rod (5311) and a catalyst carrier (5312), wherein the catalyst carrier (5312) is mainly made of non-woven fabric, and the catalyst carrier (5312) is installed on the fixing rod (5311). A photocatalyst is attached to the catalyst carrier (5312), and the photocatalyst is titanium dioxide.

7. The method for recovering ethylene glycol from waste textiles by using photocatalysis according to claim 1, characterized in that: A filter (7) is installed on the pumping pipeline between the photocatalytic device (5) and the second ethylene glycol storage tank (6).

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