Wax removal device for methanol production last-position tower

Abstract

The utility model provides a wax removal device for a methanol production last-position tower, which comprises the methanol production last-position tower, one side of the methanol production last-position tower is connected with a phase-splitting tank through an extraction pipeline, a partition plate is arranged in the phase-splitting tank, the height of the partition plate is smaller than that of the phase-splitting tank, the partition plate divides the interior of the phase-splitting tank into a heavy-phase area and a light-phase area, and the heavy-phase area is connected with the light-phase area. The extraction pipeline extends into the heavy phase area, and the outlet end of the extraction pipeline is lower than the upper plane of the partition plate; the bottom of the heavy-phase zone is connected with the bottom of the methanol production last-position tower through a reflux pipeline, and the bottom of the light-phase zone is connected with a light-phase zone extraction pipeline; in the application, through the arrangement of the subareas, wastewater and wax are respectively extracted through the heavy-phase area and the light-phase area, so that the layering state is prevented from being damaged during separation; the problem that a methanol wastewater pipeline and wastewater treatment equipment are blocked due to wax can be effectively solved; and the structure is simple, the manufacturing and maintenance cost is low, and later cleaning is also facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and in particular to a wax removal device for a final tower in methanol production. Background Art

[0002] Methanol is an important chemical raw material, widely used in fuel, solvent, pesticide and other fields. In the production process of methanol, it often contains a certain amount of waxy components. In the production and refining process of methanol, the waxy components contained in the raw materials are difficult to completely remove. Although some physical and chemical methods have been adopted in the methanol synthesis section to remove the wax in crude methanol, there is still a small amount of wax that cannot be completely removed. As the crude methanol refining process ends, it exists in the refined wastewater. As the wastewater temperature drops, it precipitates and floats on the surface of the wastewater, which can easily cause pipe blockage and difficulties in subsequent wastewater treatment.

[0003] Some of the existing technologies use buffer tanks for buffer separation, but the buffer tanks in the existing technology directly perform stratification and are operated manually. Extra caution is required during separation. If the operation is not careful, the stratification state will be destroyed; some use other devices for separation, such as the online dewaxing system of a methanol synthesis unit with application number: CN202021668658.7, which discloses a technical solution. The system includes a methanol high-pressure separator, and the output pipe of the synthesis gas is connected to the methanol high-pressure separator through parallel pipes. The parallel pipes a are provided with a water cooler and a thermometer, and the bottom end of the methanol high-pressure separator is connected through parallel pipes b, and the pipes b are provided with a first hand valve, a quick connector, a pressure gauge, a filter, a liquid level regulating valve and a second hand valve in sequence; the online dewaxing system described in the utility model effectively removes the wax generated in the system without stopping the methanol synthesis unit, and also reduces the burden on subsequent methanol distillation, but the structure of the application is complicated, which increases the cost of dewaxing.

[0004] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0005] The utility model provides a dewaxing device for a methanol production terminal tower, comprising a methanol production terminal tower, one side of the methanol production terminal tower is connected to a phase separation tank via a production pipeline, a partition is provided in the phase separation tank, the height of the partition is less than the height of the phase separation tank, the partition divides the interior of the phase separation tank into a heavy phase area and a light phase area, the production pipeline extends into the heavy phase area, and the outlet end of the production pipeline is lower than the upper plane of the partition; the bottom of the heavy phase area is connected to the bottom of the methanol production terminal tower via a reflux pipeline, and the bottom of the light phase area is connected to the light phase area production pipeline.

[0006] As a preferred solution, the final tower for methanol production is an atmospheric pressure tower or a recovery tower.

[0007] As a preferred solution, a methanol reflux extraction device is provided on the top of the methanol production final tower.

[0008] As a preferred embodiment, the methanol reflux production device includes a tower top reflux tank, which is connected to the top of the methanol production last tower through a top production pipeline, and a tower top condenser is provided on the top production pipeline. The bottom of the tower top reflux tank is connected to the methanol production last tower through a last tower reflux pipeline, and the last tower reflux pipeline is also connected to the methanol production pipeline.

[0009] As a preferred solution, the bottom of the methanol production final tower is connected to a wastewater extraction pipeline, and a tower bottom liquid cooler is provided on the wastewater extraction pipeline.

[0010] As a preferred solution, one side of the methanol production terminal tower is connected to a side sampling liquid storage tank via a side sampling pipeline, a side sampling condenser is provided on the side sampling pipeline, and the bottom of the side sampling liquid storage tank is connected to a fusel alcohol extraction pipeline.

[0011] In the present application, since the density of wax is smaller than that of water, the wax floats on the upper layer of the water surface. A built-in partition is set in the phase separation tank to divide the tank into two parts, a heavy phase zone and a light phase zone. The tank body is divided into two to form a connector. After the wastewater is statically stratified in the heavy phase zone, the heavy phase water returns to the bottom of the methanol production tower kettle from the bottom of this side. The light phase wax is controlled by an interface meter. After the liquid level rises, it overflows into the light phase zone and is then transported to the next section. The zoning setting allows wastewater and wax to be extracted separately through the heavy phase zone and the light phase zone to avoid destroying the stratified state during separation; it can effectively solve the blockage problem of methanol wastewater pipelines and wastewater treatment equipment caused by wax; and the structure of the present application is simple, the production and maintenance costs are explained, and it is also convenient for later cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of this application;

[0013] 1. Methanol production terminal tower; 2. Production pipeline; 3. Phase separation tank; 4. Partition; 5. Heavy phase zone; 6. Light phase zone; 7. Outlet end; 8. Upper plane; 9. Reflux pipeline; 10. Light phase zone production pipeline; 11. Wax removal pump; 12. Tower top reflux tank; 13. Top production pipeline; 14. Tower top condenser; 15. Terminal tower reflux pipeline; 16. Reflux pump; 17. Methanol production pipeline; 18. Wastewater production pipeline; 19. Tower bottom pump; 20. Tower bottom liquid cooler; 21. Side production pipeline; 22. Side production liquid storage tank; 23. Side production condenser; 24. Fusel alcohol production pipeline; 25. Fusel alcohol production pump. DETAILED DESCRIPTION

[0014] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0015] Example 1:

[0016] The present application provides a dewaxing device for a methanol production end tower, comprising a methanol production end tower 1, wherein the methanol production end tower 1 adopts an atmospheric pressure tower or a recovery tower in the prior art; one side of the methanol production end tower 1 is connected to a phase separation tank 3 via a production pipeline 2, wherein a partition 4 is provided in the phase separation tank 3, wherein the height of the partition 4 is less than the height of the phase separation tank 3, and the partition 4 divides the interior of the phase separation tank 3 into a heavy phase region 5 and a light phase region 6, wherein the production pipeline 2 extends to the heavy phase region 5, and the outlet end 7 of the production pipeline 2 is lower than the upper plane 8 of the partition 4; the bottom of the heavy phase region 5 is connected to the bottom of the methanol production end tower 1 via a reflux pipeline 9, and the bottom of the light phase region 6 is connected to the light phase region production pipeline 9. Pipeline 10, a wax removal pump 11 is provided on the light phase zone extraction pipeline 10; the present application removes the wax content in the bottom wastewater of the tower through side extraction. The specific principle is that the wastewater at the bottom of the methanol production last tower 1 is partially extracted into the heavy phase zone 5 of the phase separation tank 3 through side extraction. After the wastewater is statically stratified in the heavy phase zone 5, the density of wax is smaller than that of water, so the wax floats on the upper layer of the water surface. The light phase wax is controlled by the interface meter, and the liquid level overflows to the light phase zone 6 after rising, and then is transported to the next section. Specifically: the light phase wax can be transported to the boiler or gasification zone for combustion, or it can be discharged and collected for centralized treatment; the heavy phase water returns to the bottom of the methanol production last tower 1 through the reflux pipeline 9 from the bottom of the heavy phase zone 5.

[0017] This application mainly uses physical and chemical properties to remove wax from methanol distillation wastewater. Compared with biochemical and chemical dewaxing methods, the process is relatively simple, and the equipment investment and changes to the original device are relatively small. The zoning setting is used to extract wastewater and wax respectively through the heavy phase zone 5 and the light phase zone 6, avoiding the destruction of the stratified state during separation, making the treatment process more efficient; thereby effectively solving the blockage problem of the wastewater extraction pipeline and the tower bottom liquid cooler due to wax content, and effectively reducing the number of inspections and cleaning costs of the wastewater extraction pipeline and the tower bottom liquid cooler due to paraffin blockage.

[0018] Example 2:

[0019] This embodiment defines how to extract refined alcohol from the top of the final tower 1 of methanol production, how to extract wastewater from the bottom of the tower, and how to extract fusel alcohol from the side of the tower. Specifically:

[0020] A methanol reflux extraction device is provided at the top of the methanol production final tower 1, and the methanol reflux extraction device includes a tower top reflux tank 12. The tower top reflux tank 12 is connected to the top of the methanol production final tower 1 through a top extraction pipeline 13. A tower top condenser 14 is provided on the top extraction pipeline 13. The bottom of the tower top reflux tank 12 is connected to the methanol production final tower 1 through a final tower reflux pipeline 15. A reflux pump 16 is provided on the final tower reflux pipeline 15. The final tower reflux pipeline 15 is also connected to a methanol extraction pipeline 17. The refined alcohol gas at the top of the methanol production final tower 1 is condensed by the tower top condenser 14 and enters the tower top reflux tank 12. Part of the refined alcohol in the tower top reflux tank 12 is refluxed to the top of the methanol production final tower 1, and part is extracted as refined methanol.

[0021] The bottom of the methanol production final tower 1 is connected to a wastewater extraction pipeline 18, and the wastewater extraction pipeline 18 is sequentially provided with a tower bottom pump 19 and a tower bottom liquid cooler 20; the wastewater at the bottom of the methanol production final tower 1 is cooled by the tower bottom liquid cooler 20 and then discharged. Combined with the dewaxing in the phase separation tank 3, this application can effectively reduce the COD and BOD values of the wastewater and improve the water quality of the wastewater, so that the wastewater can be utilized in other sections, for example, as extraction water for the pre-tower or sent to the vaporized coal slurry preparation, thereby achieving the purpose of saving water and reducing consumption.

[0022] One side of the methanol production terminal tower 1 is connected to a side sampling liquid storage tank 22 via a side sampling pipeline 21, a side sampling condenser 23 is provided on the side sampling pipeline 21, and the bottom of the side sampling liquid storage tank 22 is connected to a fusel alcohol production pipeline 24, and a fusel alcohol production pump 25 is provided on the fusel alcohol production pipeline 24; fusel alcohol is produced through the side sampling pipeline 21, thereby improving the quality of the methanol product.

[0023] In the present application, since the density of wax is smaller than that of water, the wax floats on the upper layer of the water surface. A built-in partition 4 is set in the phase separation tank 3 to divide the tank into two parts: a heavy phase zone 5 and a light phase zone 6. The tank body is divided into two to form a connector. The wastewater enters the heavy phase zone 5 from one side of the methanol production terminal tower 1. After the heavy phase zone 5 is static and stratified, the heavy phase water returns to the bottom of the methanol production terminal tower 1 from the bottom of this side. The light phase wax is controlled by the interface meter. After the liquid level rises, it overflows into the light phase zone 6 and is then transported to the next section.

[0024] Due to the adoption of the above technical solution, this application has the following advantages:

[0025] (1) It can effectively solve the blockage problem of wastewater extraction pipeline and tower bottom liquid cooler caused by wax, thereby reducing the number of inspections and cleaning costs caused by paraffin blockage of wastewater extraction pipeline and tower bottom liquid cooler;

[0026] (2) The application has a simple structure, low production cost, and is easy to repair and clean later;

[0027] (3) Effectively reduce the COD and BOD values of wastewater and improve the water quality of wastewater, so that the wastewater can be utilized in other sections;

[0028] (4) The wax in methanol distillation wastewater is removed mainly by physical and chemical properties. Compared with biochemical and chemical wax removal methods, the process is relatively simple, and the equipment investment and the modification of the original device are relatively small;

[0029] (5) The application is in continuous operation mode, which has the advantages of high wax removal efficiency and does not affect the normal operation and production of the device.

[0030] The above-mentioned devices, connection relationships, etc. that are not specifically described belong to the existing technology, and the present invention will not make detailed descriptions here. They all belong to conventional technical means, and the present invention will not make detailed descriptions here. The technicians can choose according to the specific situation.

[0031] The preferred embodiment of the present application is described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application.

[0032] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, the various possible combinations of this application will not be described separately.

[0033] In addition, the various implementation methods of the present application can be arbitrarily combined, as long as they do not violate the concept of the present application, and they should also be regarded as the contents disclosed in the present application.

Claims

1. A dewaxing device for a methanol production terminal tower, comprising a methanol production terminal tower (1), wherein one side of the methanol production terminal tower (1) is connected to a phase separation tank (3) via a production pipeline (2), characterized in that: A partition (4) is provided in the phase separation tank (3), wherein the height of the partition (4) is less than the height of the phase separation tank (3). The partition (4) divides the interior of the phase separation tank (3) into a heavy phase region (5) and a light phase region (6). The extraction pipeline (2) extends into the heavy phase region (5), and the outlet end (7) of the extraction pipeline (2) is lower than the upper plane (8) of the partition (4); the bottom of the heavy phase region (5) is connected to the bottom of the methanol production end tower (1) via a reflux pipeline (9), and the bottom of the light phase region (6) is connected to a light phase region extraction pipeline (10).

2. A wax removal device for a final tower in methanol production according to claim 1, characterized in that: The methanol production final tower (1) is a normal pressure tower or a recovery tower.

3. A wax removal device for a final tower in methanol production according to claim 1, characterized in that: A methanol reflux extraction device is provided on the top of the methanol production final tower (1).

4. A wax removal device for a final tower in methanol production according to claim 3, characterized in that: The methanol reflux extraction device comprises a tower top reflux tank (12), the tower top reflux tank (12) is connected to the top of the methanol production final tower (1) through a top extraction pipeline (13), a tower top condenser (14) is provided on the top extraction pipeline (13), the bottom of the tower top reflux tank (12) is connected to the methanol production final tower (1) through a final tower reflux pipeline (15), and the final tower reflux pipeline (15) is also connected to a methanol extraction pipeline (17).

5. A wax removal device for a final tower in methanol production according to claim 1, characterized in that: The bottom of the methanol production final tower (1) is connected to a wastewater extraction pipeline (18), and a tower bottom liquid cooler (20) is provided on the wastewater extraction pipeline (18).

6. A wax removal device for a final tower in methanol production according to claim 1, characterized in that: One side of the methanol production terminal tower (1) is connected to a side sampling liquid storage tank (22) via a side sampling pipeline (21), a side sampling condenser (23) is provided on the side sampling pipeline (21), and the bottom of the side sampling liquid storage tank (22) is connected to a fusel alcohol extraction pipeline (24).

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