Device for recycling DMT through washing
By introducing a washing tower after the DMT trap for ethylene glycol spray cleaning, combined with gravity sedimentation and grid filter separation, the problem that the DMT trap cannot completely capture DMT particles is solved, achieving efficient recovery of DMT and ethylene glycol, and improving system stability and DMT yield.
Patent Information
- Application Number
- CN202520528095.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-25
AI Technical Summary
The DMT trap cannot completely capture DMT particles in the gas, which leads to increased wear on the vacuum pump impeller, reduced vacuum pump life, decreased vacuuming capacity, low DMT particle yield, waste, and increased production costs.
A scrubbing tower is introduced after the DMT trap, where DMT particles in the gas are cleaned by ethylene glycol spraying, forming a mixture. DMT and ethylene glycol are recovered through sedimentation separation, and further separation is achieved by gravity separation and grid filter plates, realizing the recycling and reuse of DMT and ethylene glycol.
It significantly reduces the DMT content in exhaust gases, increases DMT yield, enhances system operational stability, reduces production costs, and achieves effective recovery of DMT and ethylene glycol.
Smart Images
Figure CN223915001U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to gas treatment technical field more particularly, relate to a device through washing to recover DMT. BACKGROUND
[0002] DMT, also known as dimethyl terephthalate, is a polyester monomer that can be used in the synthetic production process of polyester fibers. DMT production requires DMT rectification tower equipment. During the production process, a large amount of mixed gas containing DMT particles is generated. These gases need to be pumped out by a vacuum pump unit. In order to ensure the normal operation of the vacuum pump unit, a DMT trap is installed during the pumping process to capture DMT particles in the gas. However, it is found in actual production that the DMT trap cannot completely capture all DMT particles in the gas, and the content of DMT particles in the mixed gas is still relatively high. When such gas enters the vacuum pump unit, it will cause the vacuum pump impeller to wear out, reduce the service life of the vacuum pump, and reduce the vacuum pumping capacity, further affecting the vacuum nature of the DMT rectification system, resulting in an increase in production costs. At the same time, due to the low yield of DMT particles, a large amount of DMT particles are wasted, and enterprises urgently need to improve the DMT recovery technology. SUMMARY
[0003] The utility model aims at solving the demand of above -mentioned prior art, provide a kind of device for recycling DMT by washing, the utility model is applied to DMT trap post, after DMT capture, gas is introduced into washing tower and is cleaned by spraying ethylene glycol, cleaning can wash off the DMT particles of gas to form mixed liquor, the DMT content in exhaust gas is significantly reduced, and the mixed liquor under washing is effectively separated into DMT and ethylene glycol by the principle of sedimentation separation in DMT collection tank, so that both can be recycled and reused.
[0004] To achieve the above object, the utility model adopts the following technical scheme:
[0005] A device for recycling DMT by washing, comprising a washing tower, an ethylene glycol input pipeline and a DMT collection tank, a spray pipe network is installed on the inside upper part of the washing tower, a gas input pipeline is connected to the outside lower part of the washing tower, the ethylene glycol input pipeline is connected to the spray pipe network, an exhaust pipeline is connected to the top of the washing tower, a washing liquid output pipeline is connected to the bottom of the washing tower, the washing liquid output pipeline is connected to the DMT collection tank, the DMT collection tank forms a removal effect of DMT particles in the washing liquid, and the DMT collection tank is connected to an ethylene glycol recovery pipeline.
[0006] Further, the DMT collecting tank comprises a tank body, a partition plate is arranged in the tank body, a mixed liquid cavity and a filtered liquid cavity are formed in the tank body by the partition plate, a gap is formed between the top of the partition plate and the inner top of the tank body, the top of the mixed liquid cavity and the top of the filtered liquid cavity are communicated, a grid filter plate is arranged on the top of the partition plate, the washing liquid output pipeline is communicated with the mixed liquid cavity, and the ethylene glycol recovery pipeline is connected with the filtered liquid cavity.
[0007] Further, the number of the grid filter plates is not less than three, and the grid filter plates are arranged in parallel.
[0008] Further, the washing tower is provided with a first liquid discharge port and a second liquid discharge port, the first liquid discharge port is arranged at a lower position than the second liquid discharge port, the washing liquid output pipeline comprises a first liquid discharge pipeline, a second liquid discharge pipeline and an inlet pipeline, the first liquid discharge pipeline and the second liquid discharge pipeline are arranged in parallel, the first liquid discharge pipeline and the second liquid discharge pipeline are connected to the inlet end of the inlet pipeline, the outlet end of the inlet pipeline extends into the mixed liquid cavity, and the first liquid discharge pipeline and the second liquid discharge pipeline are opened simultaneously.
[0009] Further, the DMT collecting tank is provided with a liquid supplementing pipeline, the liquid supplementing pipeline is communicated with the mixed liquid cavity, the outlet end of the inlet pipeline extends to the bottom of the mixed liquid cavity, a gap is formed between the outlet end of the inlet pipeline and the bottom of the mixed liquid cavity, and the outlet end of the inlet pipeline is immersed in the liquid in the mixed liquid cavity.
[0010] Further, the ethylene glycol recovery pipeline comprises a first recovery pipeline and a second recovery pipeline, the first recovery pipeline and the second recovery pipeline are arranged in parallel, the communication height of the first recovery pipeline with the filtered liquid cavity is higher than the communication height of the second recovery pipeline with the filtered liquid cavity, and the first recovery pipeline and the second recovery pipeline are not opened simultaneously.
[0011] Further, a heat exchanger and a booster pump are arranged on the ethylene glycol input pipeline.
[0012] Further, a jacket is arranged on the outside of the washing tower, and cooling water is circulated in the jacket.
[0013] The beneficial effects of the present application are as follows:
[0014] The utility model discloses a kind of through washing to recover DMT, and the gas after DMT capture is introduced into scrubbing tower to carry out ethylene glycol spray cleaning, cleaning can wash off the DMT particles of gas to form mixed liquor, the DMT content in exhaust gas is significantly reduced, the mixed liquor under washing is discharged to DMT collection tank, effectively separates DMT and ethylene glycol by the principle of sedimentation separation, so that both realize recycling, the utility model has the advantages of good practical effect, can well solve the problem of high DMT content in gas and low DMT yield. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is the schematic diagram of the principle of connecting pipe for the device of recovering DMT by washing in the embodiment.
[0016] Reference signs: scrubbing tower 1, spray pipe network 11, first liquid discharge port 12, second liquid discharge port 13, jacket 14, gas input pipeline 2, ethylene glycol input pipeline 3, heat exchanger 31, booster pump 32, exhaust pipeline 4, washing liquid output pipeline 5, first liquid discharge pipeline 51, second liquid discharge pipeline 52, tank inlet pipeline 53, DMT collection tank 6, tank body 61, partition 62, mixed liquor cavity 63, filtrate cavity 64, liquid supplement pipeline 65, grid filter plate 66, ethylene glycol recovery pipeline 7, first recovery pipeline 71, second recovery pipeline 72. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0018] As Figure 1The utility model provides a device for recycling DMT through washing, which is applied to treat the gas containing DMT particles generated by DMT rectifying tower, and the gas containing DMT particles is treated by DMT catcher first, the utility model installs in the DMT catcher post route, is used for treating the gas after DMT catcher treatment again, the utility model scheme includes washing tower 1, glycol input pipeline 3 and DMT collection tank 6, washing tower 1 lower part is connected with gas input pipeline 2 outside, and gas input pipeline 2 is used to introduce the gas after DMT catcher treatment, because the gas introduction point is in the lower part of washing tower 1, therefore the gas containing DMT particles moves from bottom to top, and the spraying pipe network 11 is installed in the inner side upper part of washing tower 1, and the glycol input pipeline 3 is connected to the spraying pipe network 11, the utility model utilizes the spraying pipe network 11 to form glycol spraying area, and the DMT particles entrained in the ascending gas can be washed by glycol spraying liquid, the exhaust pipeline 4 is connected to the top of washing tower 1, the exhaust pipeline 4 is connected to vacuum pump unit, the vacuum pump unit can form the vacuum suction effect in washing tower 1, so that the gas into the tower can move upwards, and the DMT particles after cleaning are mixed in glycol liquid to form mixed washing liquid, because the glycol and DMT are all recyclable substances, therefore the washing liquid output pipeline 5 is connected to the bottom of washing tower 1, the washing liquid output pipeline 5 is connected to DMT collection tank 6, the washing liquid is output to DMT collection tank 6 through washing liquid output pipeline 5 to be treated, the removal effect of DMT particles in washing liquid is formed in DMT collection tank 6, the DMT particles and glycol liquid are effectively separated, the DMT collection tank 6 is connected with glycol recovery pipeline 7, and the separated glycol liquid is output through glycol recovery pipeline 7, and the DMT particles remain in DMT collection tank 6 to wait for treatment, after installing the utility model, the DMT particle content in the exhaust gas is reduced significantly, which is favorable for improving the operation stability of subsequent system, and the DMT particles after washing can be separated and collected with glycol liquid in DMT collection tank 6, so that the two substances can be effectively recycled, through the application of the utility model, the DMT yield is also improved significantly, and the utility model is helpful to reduce production cost.
[0019] As Figure 1As shown, the DMT collection tank 6 includes a tank body 61, a partition plate 62 is installed inside the tank body 61, and the tank body 61 is formed with a mixed liquid cavity 63 and a filtered liquid cavity 64 by the partition plate 62. The top of the partition plate 62 is spaced from the inside top of the tank body 61, so that the mixed liquid cavity 63 and the filtered liquid cavity 64 form a top communication effect. The bottom of the partition plate 62 is fixed by welding. The washing liquid output pipeline 5 communicates with the mixed liquid cavity 63. The washing liquid discharged from the washing tower 1 first enters the mixed liquid cavity 63. By using the characteristics that DMT is insoluble in ethylene glycol and the characteristics that DMT particles are relatively heavy, the DMT particles and the ethylene glycol liquid are separated by gravity sedimentation. The DMT particles will sink and concentrate at the bottom of the mixed liquid cavity 63 due to gravity, and the ethylene glycol liquid is above the liquid level of the mixed liquid cavity 63. As the liquid level of the mixed liquid cavity 63 rises, the liquid in the mixed liquid cavity 63 can overflow to the filtered liquid cavity 64. A grid filter plate 66 is installed on the top of the partition plate 62. The grid filter plate 66 can further filter the liquid overflowing out, so that the ethylene glycol filtered liquid comes to the filtered liquid cavity 64. The ethylene glycol recovery pipeline 7 is connected to the filtered liquid cavity 64. The ethylene glycol filtered liquid is output through the ethylene glycol recovery pipeline 7 for reuse. The top cover of the DMT collection tank 6 can be opened. After the DMT collection tank 6 is used for a period of time, the DMT particle precipitate in the mixed liquid cavity 63 will increase. At this time, the top cover of the DMT collection tank 6 can be opened to take out the DMT particle precipitate. The DMT particle precipitate can also be recycled to improve the DMT yield. The DMT particle precipitate needs to be cleaned regularly to prevent flooding and DMT particles from flowing into the filtered liquid cavity 64.
[0020] As shown in Figure 1 The number of grid filter plates 66 is not less than three. A plurality of grid filter plates 66 are arranged in parallel. The grid filter plates 66 are installed inclined upward. The purpose of arranging a plurality of grid filter plates 66 is to enable the liquid in the mixed liquid cavity 63 to pass through multiple filtering effects during the rising process. The grid filter plates 66 can block the overflow of DMT. The purpose of installing the grid filter plates 66 inclined upward is to ensure that the overflow liquid is filtered ethylene glycol filtered liquid, and the DMT particles are blocked in the mixed liquid cavity 63.
[0021] As shown in Figure 1As shown, the bottom of the washing tower 1 is provided with a first liquid discharge port 12 and a second liquid discharge port 13, the setting height of the first liquid discharge port 12 is lower than that of the second liquid discharge port 13, the washing liquid output pipeline 5 comprises a first liquid discharge pipeline 51, a second liquid discharge pipeline 52 and an inlet channel pipeline 53, the first liquid discharge pipeline 51 and the second liquid discharge pipeline 52 are arranged in parallel, the first liquid discharge pipeline 51 and the second liquid discharge pipeline 52 are connected to the inlet end of the inlet channel pipeline 53 in an integrated manner, the outlet end of the inlet channel pipeline 53 extends into the mixed liquid cavity 63, the first liquid discharge pipeline 51 and the second liquid discharge pipeline 52 are opened at the same time, and the first liquid discharge pipeline 51 and the second liquid discharge pipeline 52 can both discharge washing liquid, but due to the height difference of the outlet connection points, they are actually used in a standby and starting state, during normal operation, washing liquid is output from the first liquid discharge pipeline 51 with a lower connection point, and the second liquid discharge pipeline 52 has no washing liquid output due to the higher connection point, when the first liquid discharge pipeline 51 is blocked, the washing liquid level in the washing tower 1 will rise, and the washing liquid will be naturally output from the second liquid discharge pipeline 52, so that the output line can still operate normally, in the utility model, the outlet end of the inlet channel pipeline 53 extends to the bottom of the mixed liquid cavity 63, there is a gap between the outlet end of the inlet channel pipeline 53 and the bottom of the mixed liquid cavity 63, and the outlet end of the inlet channel pipeline 53 needs to be immersed in the liquid in the mixed liquid cavity 63, under the design, the liquid in the mixed liquid cavity 63 can form a liquid seal effect on the outlet end of the inlet channel pipeline 53, which is beneficial to the establishment of a vacuum environment in the washing tower 1 (if there is no liquid seal, the vacuum of the washing tower 1 will be destroyed), before starting or after maintenance, there is a problem of liquid loss in the mixed liquid cavity 63, therefore, the utility model is provided with a liquid supplementing pipeline 65 connected to the top of the DMT collecting tank 6, the liquid supplementing pipeline 65 communicates with the mixed liquid cavity 63, and fresh ethylene glycol liquid is filled through the liquid supplementing pipeline 65, so as to establish the liquid seal effect of the outlet end of the inlet channel pipeline 53.
[0022] As shown in the figure, Figure 1 The ethylene glycol recovery pipeline 7 comprises a first recovery pipeline 71 and a second recovery pipeline 72, the first recovery pipeline 71 and the second recovery pipeline 72 are installed in parallel, the communication height of the first recovery pipeline 71 with the filtered liquid cavity 64 is higher than that of the second recovery pipeline 72 with the filtered liquid cavity 64, the first recovery pipeline 71 and the second recovery pipeline 72 adopt a standby and starting design, and the first recovery pipeline 71 and the second recovery pipeline 72 are not opened at the same time, during normal operation, the first recovery pipeline 71 with a higher communication height is started, and the second recovery pipeline 72 is closed, the advantage of starting the first recovery pipeline 71 is that a secondary precipitation effect can be formed in the filtered liquid cavity 64, and the high liquid level clear liquid output by the first recovery pipeline 71 can further ensure the purity of the output ethylene glycol liquid, and the second recovery pipeline 72 is started in the case of blockage or maintenance of the first recovery pipeline 71, so as to empty the filtered liquid cavity 64.
[0023] As shown in the figure, Figure 1As shown in the figure, a heat exchanger 31 and a booster pump 32 are installed on the ethylene glycol input pipeline 3, the booster pump 32 can boost the ethylene glycol liquid for spraying, and the heat exchanger 31 can form a cooling effect on the ethylene glycol liquid, which will improve the washing removal effect of DMT particles in the gas.
[0024] As shown in the figure, Figure 1 As shown in the figure, a jacket 14 is installed outside the washing tower 1, cooling water is circulated in the jacket 14, and the jacket 14 can form a cooling effect on the gas flowing upward along the washing tower 1, and the washing removal effect of DMT particles in the gas is better under the cooling operation.
[0025] The above is only the preferred embodiment of the present application, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical scheme belonging to the idea of the present application is within the protection scope of the present application. It should be pointed out that for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application, these improvements and decorations should also be considered as the protection scope of the present application.
Claims
1. An apparatus for recovering DMT by washing, characterized by, The application relates to a DMT collecting tank, which comprises a washing tower (1), an ethylene glycol input pipeline (3) and a DMT collecting tank (6), wherein a spraying pipeline network (11) is arranged on the upper inner side of the washing tower (1), a gas input pipeline (2) is connected to the lower outer side of the washing tower (1), the ethylene glycol input pipeline (3) is connected to the spraying pipeline network (11), an exhaust pipeline (4) is connected to the top of the washing tower (1), a washing liquid output pipeline (5) is connected to the bottom of the washing tower (1), the washing liquid output pipeline (5) is connected to the DMT collecting tank (6), the DMT collecting tank (6) is used for removing DMT particles in washing liquid, and an ethylene glycol recovery pipeline (7) is connected to the DMT collecting tank (6).
2. The apparatus for recovering DMT by washing according to claim 1, wherein, The DMT collecting tank (6) comprises a tank body (61), a partition plate (62) is arranged in the tank body (61), a mixed liquid cavity (63) and a filtered liquid cavity (64) are formed in the tank body (61) through the partition plate (62), a gap exists between the top of the partition plate (62) and the top of the inner side of the tank body (61), the top of the mixed liquid cavity (63) is communicated with the top of the filtered liquid cavity (64), a grid filter plate (66) is arranged on the top of the partition plate (62), the washing liquid output pipeline (5) is communicated with the mixed liquid cavity (63), and the ethylene glycol recovery pipeline (7) is connected to the filtered liquid cavity (64).
3. The apparatus for recovering DMT by washing according to claim 2, wherein, The number of the grid filter plates (66) is not less than three, a plurality of the grid filter plates (66) are arranged in parallel, and the grid filter plates (66) are arranged in an upward inclination.
4. The apparatus for recovering DMT by washing according to claim 2, wherein, The bottom of the washing tower (1) is provided with a first liquid discharge port (12) and a second liquid discharge port (13), the setting height of the first liquid discharge port (12) is lower than that of the second liquid discharge port (13), the washing liquid output pipeline (5) comprises a first liquid discharge pipeline (51), a second liquid discharge pipeline (52) and an inlet pipeline (53), the first liquid discharge pipeline (51) and the second liquid discharge pipeline (52) are arranged in parallel, the first liquid discharge pipeline (51) and the second liquid discharge pipeline (52) are connected to the inlet end of the inlet pipeline (53), the outlet end of the inlet pipeline (53) extends into the mixed liquid cavity (63), and the first liquid discharge pipeline (51) and the second liquid discharge pipeline (52) are simultaneously opened.
5. The apparatus for recovering DMT by washing according to claim 4, wherein, The top of the DMT collecting tank (6) is connected with a liquid supplementing pipeline (65), the liquid supplementing pipeline (65) is communicated with the mixed liquid cavity (63), the outlet end of the inlet pipeline (53) extends to the bottom of the mixed liquid cavity (63), a gap exists between the outlet end of the inlet pipeline (53) and the bottom of the mixed liquid cavity (63), and the outlet end of the inlet pipeline (53) is immersed in the liquid in the mixed liquid cavity (63).
6. The apparatus for recovering DMT by washing according to claim 2, wherein, The ethylene glycol recovery pipeline (7) comprises a first recovery pipeline (71) and a second recovery pipeline (72), the first recovery pipeline (71) and the second recovery pipeline (72) are arranged in parallel, the communication height of the first recovery pipeline (71) with the filtered liquid cavity (64) is higher than that of the second recovery pipeline (72) with the filtered liquid cavity (64), and the first recovery pipeline (71) and the second recovery pipeline (72) are not simultaneously opened.
7. The apparatus for recovering DMT by washing according to claim 1, wherein, A heat exchanger (31) and a booster pump (32) are installed on the ethylene glycol input pipeline (3).
8. The apparatus for recovering DMT by washing according to claim 1, wherein, A jacket (14) is installed outside the washing tower (1), and cooling water is circulated in the jacket (14).