Novel device for recovering waste DMO by solvent
By designing a new device that uses the reflux mixed liquid of the DMC separation tower as a solvent, the problem of ineffective DMO recovery in the prior art is solved, and efficient DMO recovery and reduction of methanol consumption are achieved.
Patent Information
- Application Number
- CN202421685775.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-17
AI Technical Summary
The existing technology is difficult to effectively recover and treat dimethyl oxalate (DMO), resulting in high production costs, high risk of environmental protection accidents, and increased methanol consumption.
A new device was designed to use the mixed liquid refluxed from the DMC separation tower as a solvent, and the dissolution, filtration and distillation recovery of DMO through the dissolution tank, filtration equipment and conveying pump system, avoiding the consumption of methanol.
It realizes efficient recycling of DMO, reduces production costs, avoids the risk of environmental accidents, and reduces methanol consumption.
Smart Images
Figure CN222900236U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solid fusion, in particular to a device for recycling waste DMO of a new solvent. Background Technique
[0002] Dimethyl oxalate is used in organic synthesis, as an intermediate for vitamin B13, and can also be used as a solvent and a plasticizer.
[0003] At present, in the market, whether it is Pujing, Danhua or High Chemistry, during the production process of ethylene glycol, the intermediate product of the production process is DMO (dimethyl oxalate). Due to its special nature, a large amount of waste dimethyl oxalate can be generated during pipeline replacement, equipment cleaning or equipment leakage during inspection and maintenance. The melting point of dimethyl oxalate is 54°C, and it is in the form of white crystals at room temperature. The production system belongs to a closed high-temperature system, and the solid dimethyl oxalate cannot be directly recycled, and DMO belongs to hazardous waste, which is difficult to handle.
[0004] At present, most of the treatment methods for DMO waste rely on third-party hazardous waste treatment units for incineration treatment. First, it causes great unnecessary waste to the process system and increases the production cost; second, it is necessary to pay a part of the fee to let a qualified third-party hazardous waste treatment unit handle it, indirectly increasing the production cost; third, during the process of handling and collecting this waste DMO, it is extremely easy to cause environmental protection accidents; fourth, some units have self-made recycling devices that use methanol for dissolution and recycling, which will cause a certain increase in methanol consumption.
[0005] At present, there is no good treatment method, and the existing process has an unsatisfactory recycling effect on DMO waste. First, it wastes manpower and material resources during the treatment process; second, it needs to be bagged and stored before the third-party treatment process, resulting in an increase in the company's hazardous waste storage; third, DMO will hydrolyze to form oxalic acid when exposed to moisture during storage. If stored in large quantities for a long time, it will cause damage to the woven bags and then corrode the steel structure of the hazardous waste warehouse; fourth, it will cause an increase in the unit consumption of methanol.
[0006] Therefore, we propose a device for recycling waste DMO of a new solvent to solve the above problems. Content of the Utility Model
[0007] The purpose of the utility model is to provide a device for recycling waste DMO of a new solvent to solve the problems put forward in the above background technique.
[0008] To achieve the above purpose, the utility model provides the following technical solutions:
[0009] A new device for recovering waste DMO from solvents, including a dissolution tank. The upper surface of the dissolution tank is fixedly communicated with a feed pipe. The bottom surface of the dissolution tank is provided with a filtering device. The bottom surface of the filtering device is fixedly communicated with a first pipe. The left end of the first pipe is provided with a first transfer pump. The input end of the first transfer pump is fixedly communicated with the left end of the first pipe. The output end of the first transfer pump is fixedly communicated with a second pipe. The outer surface of the second pipe is fixedly communicated with a third pipe. The upper end of the third pipe is fixedly communicated with the outer surface of the dissolution tank. The left end of the second pipe is provided with a material discharging tank. The outer surface of the material discharging tank is fixedly communicated with the left end of the third pipe. The bottom surface of the material discharging tank is provided with a second transfer pump. The output end of the second transfer pump is fixedly communicated with a fourth pipe. The left end of the fourth pipe is provided with a crude DMO storage tank. The outer surface of the crude DMO storage tank is fixedly communicated with the left end of the fourth pipe. The bottom surface of the crude DMO storage tank is fixedly communicated with a fifth pipe. The left end of the fifth pipe is provided with a third transfer pump. The input end of the third transfer pump is fixedly communicated with the left end of the fifth pipe. The output end of the third transfer pump is fixedly communicated with a sixth pipe. The back surface of the crude DMO storage tank is provided with a DMO light component removal tower. The outer surface of the DMO light component removal tower is fixedly communicated with the left end of the sixth pipe. The back surface of the DMO light component removal tower is provided with a storage tank. The storage tank is communicated with the DMO light component removal tower through a pipe. The bottom surface of the DMO light component removal tower is fixedly communicated with a seventh pipe. The right end of the seventh pipe is provided with a fourth transfer pump. The input end of the fourth transfer pump is fixedly communicated with the right end of the seventh pipe. The output end of the fourth transfer pump is fixedly communicated with an eighth pipe. The right end of the eighth pipe is provided with a DMC separation tower. The outer surface of the DMC separation tower is fixedly communicated with the right end of the eighth pipe. The bottom surface of the DMC separation tower is fixedly communicated with a ninth pipe. The front end of the ninth pipe is provided with a fifth transfer pump. The input end of the fifth transfer pump is fixedly communicated with the front end of the ninth pipe. The output end of the fifth transfer pump is fixedly communicated with a tenth pipe. The upper end of the tenth pipe is fixedly communicated with the upper surface of the material discharging tank. The upper end of the DMC separation tower is communicated with the upper surface of the crude DMO storage tank through a pipe. The outer surface of the DMC separation tower is fixedly communicated with an eleventh pipe. The front end of the eleventh pipe is provided with a methanol and dimethyl carbonate mixing tank. The outer surface of the methanol and dimethyl carbonate mixing tank is fixedly communicated with the front end of the eleventh pipe. The outer surface of the methanol and dimethyl carbonate mixing tank is fixedly communicated with a twelfth pipe. The right end of the twelfth pipe is fixedly communicated with the outer surface of the dissolution tank.
[0010] In a further embodiment, display signs are provided on the outer surfaces of the dissolution tank, the material discharging tank and the crude DMO storage tank, and support legs are provided on the bottom surfaces of the dissolution tank, the material discharging tank and the crude DMO storage tank.
[0011] In a further embodiment, a fixing rod is fixedly connected to the outer surface of the second pipeline, and one end of the fixing rod away from the second pipeline is fixedly connected to the outer surface of the discharging chute.
[0012] In a further embodiment, bases are fixedly installed on the outer surfaces of the first transfer pump and the third transfer pump.
[0013] In a further embodiment, drain pipes are fixedly communicated with the backs of the DMO light component removal tower and the DMC separation tower, and a first sealing cover is arranged on the outer surface of each drain pipe.
[0014] In a further embodiment, a second sealing cover is arranged on the outer surface of the feed pipe.
[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0016] By using the mixed liquid refluxed from the DMC separation tower as a solvent, the dissolved material can enter the discharging chute for temporary storage. When it accumulates to a certain liquid level, it is returned to the crude DMO storage tank through the second transfer pump and mixed with the crude DMO from the previous section, and then is transported to the DMO light component removal tower through the third transfer pump for rectification and recovery. Not only can DMO be recovered, but also methanol and DMC are not consumed and wasted. Except for manual labor, the increased utility consumption cost in the whole process is only the power consumption of the dimethyl oxalate transfer pump and a certain amount of utility nitrogen required for the replacement of the dimethyl oxalate dissolver. The total consumption cost is very low. This process can be operated intermittently. After the solid waste DMO is stored to a certain amount, it is centrally recovered and treated at one time. This dissolution process is simple to operate, safe in the process, and has no risk of fire, explosion or personnel poisoning. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a front view structural schematic diagram of a device for recovering waste DMO with a new type of solvent.
[0018] Figure 2 It is a top view structural schematic diagram of a device for recovering waste DMO with a new type of solvent.
[0019] Figure 3 It is a bottom view structural schematic diagram of a device for recovering waste DMO with a new type of solvent.
[0020] Figure 4 It is a system diagram of a device for recovering waste DMO with a new type of solvent.
[0021] In the figure: 1, dissolution tank; 2, feed pipe; 3, filtering equipment; 4, first pipeline; 5, first delivery pump; 6, second pipeline; 7, third pipeline; 8, withdrawal tank; 9, second delivery pump; 10, fourth pipeline; 11, crude DMO storage tank; 12, fifth pipeline; 13, third delivery pump; 14, sixth pipeline; 15, DMO light component removal tower; 16, storage tank; 17, seventh pipeline; 18, fourth delivery pump; 19, eighth pipeline; 20, DMC separation tower; 21, ninth pipeline; 22, fifth delivery pump; 23, tenth pipeline; 24, eleventh pipeline; 25, methanol and dimethyl carbonate mixing tank; 26, twelfth pipeline; 27, display board; 28, support leg; 29, fixing rod; 30, base; 31, sewage pipe; 32, first sealing cover; 33, second sealing cover. Detailed implementation manners
[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.
[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.
[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0025] Please refer to Figures 1-4, in the present utility model, a novel device for recovering waste DMO of solvent comprises a dissolution tank 1. A feed pipe 2 is fixedly communicated with the upper surface of the dissolution tank 1. A filtering device 3 is arranged at the bottom surface of the dissolution tank 1. A first pipe 4 is fixedly communicated with the bottom surface of the filtering device 3. A first delivery pump 5 is arranged at the left end of the first pipe 4. The input end of the first delivery pump 5 is fixedly communicated with the left end of the first pipe 4. The output end of the first delivery pump 5 is fixedly communicated with a second pipe 6. A third pipe 7 is fixedly communicated with the outer surface of the second pipe 6. The upper end of the third pipe 7 is fixedly communicated with the outer surface of the dissolution tank 1. A discharge tank 8 is arranged at the left end of the second pipe 6. The outer surface of the discharge tank 8 is fixedly communicated with the left end of the third pipe 7. A second delivery pump 9 is arranged at the bottom surface of the discharge tank 8. The output end of the second delivery pump 9 is fixedly communicated with a fourth pipe 10. A crude DMO storage tank 11 is arranged at the left end of the fourth pipe 10. The outer surface of the crude DMO storage tank 11 is fixedly communicated with the left end of the fourth pipe 10. A fifth pipe 12 is fixedly communicated with the bottom surface of the crude DMO storage tank 11. A third delivery pump 13 is arranged at the left end of the fifth pipe 12. The input end of the third delivery pump 13 is fixedly communicated with the left end of the fifth pipe 12. The output end of the third delivery pump 13 is fixedly communicated with a sixth pipe 14. A DMO light component removal tower 15 is arranged at the back of the crude DMO storage tank 11. The outer surface of the DMO light component removal tower 15 is fixedly communicated with the left end of the sixth pipe 14. A storage tank 16 is arranged at the back of the DMO light component removal tower 15. The storage tank 16 is communicated with the DMO light component removal tower 15 through a pipe. A seventh pipe 17 is fixedly communicated with the bottom surface of the DMO light component removal tower 15. A fourth delivery pump 18 is arranged at the right end of the seventh pipe 17. The input end of the fourth delivery pump 18 is fixedly communicated with the right end of the seventh pipe 17. The output end of the fourth delivery pump 18 is fixedly communicated with an eighth pipe 19. A DMC separation tower 20 is arranged at the right end of the eighth pipe 19. The outer surface of the DMC separation tower 20 is fixedly communicated with the right end of the eighth pipe 19. A ninth pipe 21 is fixedly communicated with the bottom surface of the DMC separation tower 20. A fifth delivery pump 22 is arranged at the front end of the ninth pipe 21. The input end of the fifth delivery pump 22 is fixedly communicated with the front end of the ninth pipe 21. The output end of the fifth delivery pump 22 is fixedly communicated with a tenth pipe 23. The upper end of the tenth pipe 23 is fixedly communicated with the upper surface of the discharge tank 8. The upper end of the DMC separation tower 20 is fixedly communicated with the upper surface of the crude DMO storage tank 11 through a pipe. An eleventh pipe 24 is fixedly communicated with the outer surface of the DMC separation tower 20. A methanol and dimethyl carbonate mixing tank 25 is arranged at the front end of the eleventh pipe 24. The outer surface of the methanol and dimethyl carbonate mixing tank 25 is fixedly communicated with the front end of the eleventh pipe 24. A twelfth pipe 26 is fixedly communicated with the outer surface of the methanol and dimethyl carbonate mixing tank 25. The right end of the twelfth pipe 26 is fixedly communicated with the outer surface of the dissolution tank 1. The DMO solid is put into the dissolution tank 1 from the feed pipe 2, thereby adding solid DMO. The mixed liquid refluxed from the DMC separation tower 20 is transported as a solvent to the dissolution pipe 1 to react and dissolve with DMO, and then is filtered in the filtering device 3.After filtration, it either flows by gravity to the discharge tank 8 through the first transfer pump 5. The second transfer pump 9 under the discharge tank 8 sends it into the crude dimethyl oxalate storage tank, where it is mixed with the crude DMO from the previous section. Then, it is pumped to the DMO rectification system for recycling. Both methanol and dimethyl carbonate have strong solubility, enabling dimethyl oxalate to come into full contact with the new solvent under the action of the transfer pump to form a miscible mixture. Dimethyl oxalate changes from solid to liquid state, flows by gravity to the filtration device 3, and then is sent to the carbonylation discharge tank 8 through the first transfer pump 5 or by gravity.
[0026] Display plates 27 are provided on the outer surfaces of the dissolution tank 1, the discharge tank 8, and the crude DMO storage tank 11. Support legs 28 are provided on the bottom surfaces of the dissolution tank 1, the discharge tank 8, and the crude DMO storage tank 11. A fixing rod 29 is fixedly connected to the outer surface of the second pipeline 6, and the end of the fixing rod 29 away from the second pipeline 6 is fixedly connected to the outer surface of the discharge tank 8. Bases 30 are fixedly installed on the outer surfaces of the first transfer pump 5 and the third transfer pump 13. The display plate 27 shows the name of the equipment, which is conducive to personnel identification. The support legs 28 support each equipment to prevent the bottom surface of the equipment from contacting the ground and being corroded. The fixing rod 29 fixes the second pipeline 6 to ensure the stability of the second pipeline 6. The bases 30 support each transfer pump to protect the transfer pumps.
[0027] Drain pipes 31 are fixedly connected to the backs of the DMO light removal tower 15 and the DMC separation tower 20. First sealing covers 32 are provided on the outer surfaces of each drain pipe 31, and a second sealing cover 33 is provided on the outer surface of the feed pipe 2. When the interiors of the DMO light removal tower 15 and the DMC separation tower 20 need to be cleaned, the first sealing cover 32 is opened to allow the dirt to be discharged from the drain pipe 31 for internal cleaning. When no fixed DMO is added to the dissolution tank 1, the second sealing cover 33 is used to seal the feed pipe 2 to prevent foreign objects from entering the dissolution tank.
[0028] The working principle of the present utility model is:
[0029] This device uses a new type of methanol and dimethyl carbonate mixed liquid existing in the system to dissolve DMO. Through the filtration device 3, it either flows through the first transfer pump 5 or by gravity to the discharge tank 8. The liquid pump under the discharge tank 8 is used to send it into the crude dimethyl oxalate storage tank, where it is mixed with the crude DMO from the previous section. Then, it is pumped to the DMO rectification system for recycling. Both methanol and dimethyl carbonate have strong solubility, enabling dimethyl oxalate to come into full contact with the new solvent under the action of the transfer pump to form a miscible mixture. Dimethyl oxalate changes from solid to liquid state, flows by gravity to the filtration device, and then is sent to the carbonylation discharge tank 8 through the transfer pump or by gravity.
[0030] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.
[0031] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A novel solvent recovery device for waste DMO, characterized by: The invention comprises a dissolving tank (1), wherein the upper surface of the dissolving tank (1) is fixedly connected to a feeding pipe (2), the bottom surface of the dissolving tank (1) is provided with a filtering device (3), the bottom surface of the filtering device (3) is fixedly connected to a first pipeline (4), the left end of the first pipeline (4) is provided with a first delivery pump (5), the input end of the first delivery pump (5) is fixedly connected to the left end of the first pipeline (4), the output end of the first delivery pump (5) is fixedly connected to a second pipeline (6), the outer surface of the second pipeline (6) is fixedly connected to a third pipeline (7), the upper end of the third pipeline (7) is fixedly connected to the outer surface of the dissolving tank (1), the left end of the second pipeline (6) is provided with a material return groove (8), the outer surface of the material return groove (8) is The left end of the third pipeline (7) is fixedly connected to the third pipeline (7); the bottom surface of the material return trough (8) is provided with a second delivery pump (9); the output end of the second delivery pump (9) is fixedly connected to a fourth pipeline (10); the left end of the fourth pipeline (10) is provided with a crude DMO storage tank (11); the outer surface of the crude DMO storage tank (11) is fixedly connected to the left end of the fourth pipeline (10); the bottom surface of the crude DMO storage tank (11) is fixedly connected to a fifth pipeline (12); the left end of the fifth pipeline (12) is provided with a third delivery pump (13); the input end of the third delivery pump (13) is fixedly connected to the left end of the fifth pipeline (12); the output end of the third delivery pump (13) is fixedly connected to a sixth pipeline (14); the crude DMO storage tank (11) is fixedly connected to the left end of the fifth pipeline (12); A DMO light removal tower (15) is provided on the back of the tank (11), the outer surface of the DMO light removal tower (15) is fixedly connected to the left end of the sixth pipeline (14), a storage tank (16) is provided on the back of the DMO light removal tower (15), the storage tank (16) is connected to the DMO light removal tower (15) through a pipeline, a seventh pipeline (17) is fixedly connected to the bottom surface of the DMO light removal tower (15), a fourth delivery pump (18) is provided at the right end of the seventh pipeline (17), the input end of the fourth delivery pump (18) is fixedly connected to the right end of the seventh pipeline (17), the output end of the fourth delivery pump (18) is fixedly connected to the eighth pipeline (19), and a DMC separation tower (20) is provided at the right end of the eighth pipeline (19). The outer surface of the DMC separation tower (20) is fixedly connected to the right end of the eighth pipeline (19); the bottom surface of the DMC separation tower (20) is fixedly connected to a ninth pipeline (21); a fifth delivery pump (22) is provided at the front end of the ninth pipeline (21); the input end of the fifth delivery pump (22) is fixedly connected to the front end of the ninth pipeline (21); the output end of the fifth delivery pump (22) is fixedly connected to a tenth pipeline (23); the upper end of the tenth pipeline (23) is fixedly connected to the upper surface of the material return trough (8); the upper end of the DMC separation tower (20) is fixedly connected to the upper surface of the crude DMO storage tank (11) through a pipeline; the outer surface of the DMC separation tower (20) is fixedly connected to an eleventh pipeline (24);A methanol and dimethyl carbonate mixing tank (25) is provided at the front end of the eleventh pipeline (24), and the outer surface of the methanol and dimethyl carbonate mixing tank (25) is fixedly connected to the front end of the eleventh pipeline (24). A twelfth pipeline (26) is fixedly connected to the outer surface of the methanol and dimethyl carbonate mixing tank (25), and the right end of the twelfth pipeline (26) is fixedly connected to the outer surface of the dissolving tank (1).
2. A novel solvent recovery device for waste DMO according to claim 1, characterized in that: The outer surfaces of the dissolving tank (1), the material return trough (8) and the crude DMO storage tank (11) are all provided with display boards (27), and the bottom surfaces of the dissolving tank (1), the material return trough (8) and the crude DMO storage tank (11) are all provided with support legs (28).
3. A novel solvent recovery device for waste DMO according to claim 1, characterized in that: A fixing rod (29) is fixedly connected to the outer surface of the second pipe (6), and one end of the fixing rod (29) away from the second pipe (6) is fixedly connected to the outer surface of the material withdrawal trough (8).
4. A novel solvent recovery device for waste DMO according to claim 1, characterized in that: Bases (30) are fixedly mounted on the outer surfaces of the first delivery pump (5) and the third delivery pump (13).
5. A novel solvent recovery device for waste DMO according to claim 1, characterized in that: The backs of the DMO light removal tower (15) and the DMC separation tower (20) are both fixedly connected with a sewage pipe (31), and the outer surface of each sewage pipe (31) is provided with a first sealing cover (32).
6. A novel solvent recovery device for waste DMO according to claim 1, characterized in that: The outer surface of the feed pipe (2) is provided with a second sealing cover (33).