Circulating system taking vinyl pyrrolidone as main body

Abstract

The embodiment of the utility model provides a circulation system taking vinyl pyrrolidone as a main body, and relates to the technical field of vinyl pyrrolidone reaction. The circulating system taking vinyl pyrrolidone as the main body comprises a reaction device, an NVP device and an NMP device, and raw materials reacted in the reaction device are conveyed into the NVP device to be subjected to an ethenylation reaction. Acetylene tail gas generated by the NVP device enters the acetylene recovery device, NMP is adopted as an absorption solvent, fresh acetylene is generated, purchase of acetylene gas is reduced, ammonia water is purified through the ammonia water purification device, meanwhile, monomethylamine and gamma-butyrolactone serve as raw materials and are fed into the NMP device to react to produce NMP, and the production cost is reduced. And the produced NMP is conveyed to the acetylene recovery device to recover acetylene tail gas, so that the problem of environmental pollution caused by more emission of ammonia-containing waste gas and acetylene-containing tail gas is solved, the recycling rate of materials can be increased, the consumption of raw materials can be reduced, and resources can be fully utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of vinyl pyrrolidone reaction, in particular to a circulation system with vinyl pyrrolidone as the main body. Background Art

[0002] N-vinyl pyrrolidone (NVP) is an organic synthetic raw material that can increase the physical and chemical properties of products and is widely used: in radiation medicine, wooden flooring industry, paper or paperboard industry, packaging materials, and screen ink industry, NVP is used to improve the physical properties of products.

[0003] NVP can be used as a reactive diluent for UV- and electron-beam-cured polymer systems, which are used in inks, coatings and adhesives. N-vinyl pyrrolidone monomer is mainly used to synthesize polyvinyl pyrrolidone (PVP), which is a water-soluble synthetic polymer compound with excellent performance and wide application. Due to its unique solubility, complexing ability and physiological inertness, it has been the focus of scientific and industrial circles since its introduction as artificial plasma in the late 1930s.

[0004] However, when vinyl pyrrolidone is reacted, there are many reaction steps and no more reasonable production process, which leads to a large amount of ammonia waste gas and acetylene tail gas emissions, causing serious environmental pollution. Secondly, in the prior art, resources are not fully utilized when vinyl pyrrolidone is reacted. For example, the acetylene tail gas generated during the reaction is not fully utilized, resulting in high production costs and the company failing to achieve good economic benefits. Utility Model Content

[0005] The utility model aims to provide a circulation system with vinyl pyrrolidone as the main body, which can avoid the situation that when vinyl pyrrolidone is reacted, there are many reaction steps and no more reasonable production process, which leads to a large amount of ammonia-containing waste gas and acetylene-containing tail gas emissions, causing serious environmental pollution, and secondly, the resources are not fully utilized when vinyl pyrrolidone is reacted in the prior art.

[0006] The utility model provides a circulation system with vinyl pyrrolidone as the main body, comprising a reaction device, an NVP device and an NMP device, wherein the raw materials after the reaction in the reaction device are transported to the NVP device for ethylene reaction, wherein the acetylene tail gas generated by the NVP device enters an acetylene recovery device, new acetylene is generated by adding an absorption solvent into the acetylene recovery device, the ammonia water generated in the NVP device enters an ammonia water purification device for purification, and the NMP generated in the NMP device is transported to the acetylene recovery device for tail gas recovery.

[0007] In a specific embodiment, the NMP extracted from the NMP device is transported to the CNT conductive agent device as a reaction raw material.

[0008] In a specific embodiment, the NVP produced by the NVP device is transported to a polyvinyl pyrrolidone device to produce polyvinyl pyrrolidone.

[0009] In a specific embodiment, the polyvinyl pyrrolidone produced by the polyvinyl pyrrolidone device is transported to the CNT conductive agent device to react with the NMP raw material to produce the CNT conductive agent.

[0010] In a specific embodiment, a feed pipe is arranged on the upper side of the acetylene recovery device, a plurality of discharge holes are provided at the bottom of the feed pipe, a plurality of straight pipes are inserted into the discharge holes, the lower ends of the straight pipes are connected to the conduit, the lower end of the conduit is connected to the discharge pipe, and a plurality of dispersion pipes are arranged on the lower side of the discharge pipe.

[0011] In a specific embodiment, the plurality of straight tubes are distributed in a ring shape, and the conduits are in an inclined state.

[0012] In a specific embodiment, the upper end of the straight pipe is inserted into an extension sleeve, the upper side of the extension sleeve is connected to a plug-in sleeve, and the plug-in sleeve is sleeved on the lower side of the feed pipe.

[0013] In a specific embodiment, a sealing ring is sleeved on the upper end of the straight tube.

[0014] In a specific embodiment, a diverter pipe is inserted at the center of the feed pipeline, the lower side of the diverter pipe is connected to a hollow cylinder, a plurality of connecting pipes are arranged on the lower side of the hollow cylinder, the lower side of the connecting pipe is connected to an annular pipe, and a plurality of droppers are arranged on the lower side of the annular pipe.

[0015] In a specific embodiment, the annular pipe is located between a plurality of discharge pipes.

[0016] The embodiment of the utility model provides a circulation system with vinyl pyrrolidone as the main body. Compared with the prior art:

[0017] 1. The utility model uses NVP device to generate acetylene tail gas which enters into acetylene recovery device, adopts NMP as absorption solvent, generates fresh acetylene, reduces the purchase of acetylene gas, and purifies ammonia through ammonia purification device. Meanwhile, monomethylamine and γ-butyrolactone are sent into NMP device as raw materials to react and produce NMP, and the produced NMP is sent to acetylene recovery device to recover acetylene tail gas, which not only solves the problems of high emission of ammonia-containing waste gas and acetylene-containing tail gas, troublesome post-processing and environmental pollution, reduces the production scale of factory torches and incinerators, enhances the recycling rate of materials, reduces the consumption of raw materials, makes full use of resources, greatly reduces production costs, realizes the rationality of acetylene method pyrrolidone production process, realizes a good circular economic system, conforms to the concept of green development, realizes the maximization of enterprise economic benefits, and has obvious competitive advantages.

[0018] 2. When NMP is added through the feed pipeline, in order to make NMP and acetylene tail gas fully contact and react, the utility model arranges a straight pipe around the feed pipeline so that NMP can enter the side of the acetylene recovery device. At the same time, the diverter pipe is arranged at the center of the feed pipeline and connected to the annular pipe at the lower end so that NMP can enter the inner area of ​​the acetylene recovery device. Therefore, by transporting NMP to various parts in the acetylene recovery device, the full reaction of NMP and acetylene tail gas is improved, the reaction quality of acetylene tail gas is improved, and the waste of resources is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure process flow of an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of an acetylene recovery device according to an embodiment of the utility model;

[0022] Figure 3 It is a schematic cross-sectional view of the structure of an acetylene recovery device according to an embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the disassembly of the feed pipe and the extension sleeve structure of an embodiment of the utility model;

[0024] Figure 5 It is a schematic diagram of the disassembly of the plug sleeve and the straight pipe structure of an embodiment of the utility model.

[0025] icon:

[0026] 1. Reaction device; 2. Acetylene recovery device; 3. NVP device; 4. Polyvinyl pyrrolidone device; 5. CNT conductive agent device; 6. CNT conductive agent; 7. NMP device; 8. Ammonia purification device; 9. Feed pipeline; 10. Discharge hole; 11. Plug sleeve; 12. Extension sleeve; 13. Straight pipe; 14. Conduit; 15. Discharge pipe; 16. Diverter pipe; 17. Hollow cylinder; 18. Connecting pipe; 19. Ring pipe; 20. Dropper; 21. Dispersion pipe; 22. Sealing ring. DETAILED DESCRIPTION

[0027] When vinyl pyrrolidone is reacted, the reaction steps are numerous and there is no more reasonable production process, which leads to a large amount of ammonia-containing waste gas and acetylene-containing tail gas emissions, which seriously pollutes the environment. Secondly, in the prior art, resources are not fully utilized when vinyl pyrrolidone is reacted. For example, the acetylene tail gas generated during the reaction is not fully utilized, which leads to high production costs and prevents enterprises from achieving good economic benefits. Therefore, a circulation system based on vinyl pyrrolidone is provided after research. When used, the acetylene tail gas generated by the NVP device enters the acetylene recovery device, and NMP is used as an absorption solvent to produce fresh acetylene, reduce the purchase of acetylene gas, and purify the ammonia water through the ammonia water purification device. At the same time, monomethylamine and γ-butyrolactone are sent to the NMP device as raw materials to react and produce NMP, and the produced NMP is sent to the acetylene recovery device to recover the acetylene tail gas, which solves the problems of large amount of ammonia-containing waste gas and acetylene-containing tail gas emissions, troublesome post-processing, and environmental pollution, thereby solving the above-mentioned defects.

[0028] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0029] Please refer to Figure 1-Figure 5The embodiment of the utility model provides a circulation system with vinyl pyrrolidone as the main body, including a reaction device 1, an NVP device 3 and an NMP device 7. Liquid ammonia and γ-butyrolactone purchased from outside the factory are used as raw materials and sent to the reaction device 1 to produce α-P (α-pyrrolidone) through an amination reaction. α-P and purchased acetylene gas are sent to the NVP device 3 for ethylene reaction to produce NVP (vinyl pyrrolidone). The acetylene tail gas produced by the NVP device 3 enters the acetylene recovery device 2. New acetylene is generated by adding an absorption solvent to the acetylene recovery device 2, thereby reducing the purchase of acetylene gas and improving the utilization efficiency of resources. The absorption solvent is NMP. Monomethylamine and γ-butyrolactone purchased from outside the factory are used as raw materials and sent to the NMP device 7 for reaction to produce NMP (N-methylpyrrolidone). The produced NMP is sent to the acetylene recovery device 2 to recover the acetylene tail gas. The ammonia water produced in the NVP device 3 enters the ammonia water purification device 8 for purification.

[0030] Among them, monomethylamine can also be recycled to continue to participate in the reaction, the NMP extracted from the NMP device 7 is sent to the CNT conductive agent device 5 as a reaction raw material, the NVP produced by the NVP device 3 is sent to the polyvinyl pyrrolidone device 4 to produce polyvinyl pyrrolidone, and another part of the PVP produced by the polyvinyl pyrrolidone device 4 is sent to the CNT conductive agent device 5 to participate in the reaction with the NMP raw material, and the produced CNT conductive agent 6 can be sold for external processing.

[0031] In order to allow NMP to enter the acetylene recovery device 2 and fully react with the acetylene tail gas, a feed pipe 9 is arranged on the upper side of the acetylene recovery device 2, and a plurality of discharge holes 10 are opened at the bottom of the feed pipe 9. A plurality of straight pipes 13 are inserted into the discharge holes 10. NMP enters the acetylene recovery device 2 through the straight pipes 13, wherein the lower end of the straight pipe 13 is connected to the conduit 14, and the lower end of the conduit 14 is connected to the discharge pipe 15. A plurality of dispersion pipes 21 are arranged at the lower side of the discharge pipe 15, and the dispersion pipes 21 scatter the material in the acetylene recovery device 2.

[0032] The plurality of straight pipes 13 are distributed in a ring shape and close to the inner wall of the acetylene recovery device 2, so that the material reacts with the acetylene tail gas on the side of the acetylene recovery device 2. The conduit 14 is inclined to facilitate the material to flow from the straight pipe 13 into the conduit 14 and flow into the discharge pipe 15 more quickly.

[0033] And the upper end of the straight pipe 13 is inserted into the extension sleeve 12, the upper side of the extension sleeve 12 is connected to the plug sleeve 11, and the plug sleeve 11 is sleeved on the lower side of the feed pipe 9, which not only fixes the straight pipe 13 but also seals the straight pipe 13. A sealing ring 22 is sleeved on the upper end of the straight pipe 13, and the sealing ring 22 is located between the straight pipe 13 and the discharge hole 10 to seal the discharge hole 10.

[0034] Furthermore, a shunt pipe 16 is inserted at the center of the feed pipe 9, and the lower side of the shunt pipe 16 is connected to the hollow cylinder 17. A plurality of connecting pipes 18 are arranged on the lower side of the hollow cylinder 17. The lower side of the connecting pipe 18 is connected to an annular pipe 19. The annular pipe 19 is located between a plurality of discharge pipes 15. A plurality of droppers 20 are arranged on the lower side of the annular pipe 19, so that the material is fully distributed in the middle position of the acetylene recovery device 2 through the annular pipe 19, and fully reacts with the acetylene tail gas in the middle, thereby improving resource utilization.

[0035] In summary, the working principle of the circulation system with vinyl pyrrolidone as the main body in the embodiment of the utility model is as follows: liquid ammonia and γ-butyrolactone are purchased from outside the factory as raw materials, and are sent to the reaction device 1 for amination reaction to produce α-P, and α-P and the purchased acetylene gas are sent to the NVP device 3 for ethylene reaction to produce NVP, and the acetylene tail gas produced by the NVP device 3 enters the acetylene recovery device 2, and NMP is used as the absorption solvent to produce fresh acetylene, thereby reducing the purchase of acetylene gas, and monomethylamine and γ-butyrolactone are purchased from outside the factory as The raw materials are sent to the NMP device 7 for reaction to produce NMP. The produced NMP is sent to the acetylene recovery device 2 to recover the acetylene tail gas. Monomethylamine can also be recovered to continue to participate in the reaction. The NMP produced by the NMP device 7 is sent to the CNT conductive agent device 5 as a reaction raw material. The NVP produced by the NVP device 3 is sent to the polyvinyl pyrrolidone device 4 to produce polyvinyl pyrrolidone for external sale. Another part of the produced PVP is sent to the CNT conductive agent device 5 to react with the NMP raw material, and the produced CNT conductive agent 6 is sold externally.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A circulation system with vinyl pyrrolidone as the main component, comprising a reaction device (1), an NVP device (3) and an NMP device (7), characterized in that: The raw materials after the reaction in the reaction device (1) are transported to the NVP device (3) for ethylene reaction, wherein the acetylene tail gas generated by the NVP device (3) enters the acetylene recovery device (2), and new acetylene is generated by adding an absorption solvent to the acetylene recovery device (2), the ammonia water generated in the NVP device (3) enters the ammonia water purification device (8) for purification, and the NMP generated in the NMP device (7) is transported to the acetylene recovery device (2) to recover the tail gas.

2. The circulation system based on vinyl pyrrolidone according to claim 1, characterized in that: The NMP extracted from the NMP device (7) is transported to the CNT conductive agent device (5) as a reaction raw material.

3. The circulation system based on vinyl pyrrolidone according to claim 2, characterized in that: The NVP produced by the NVP device (3) is transported to the polyvinyl pyrrolidone device (4) to produce polyvinyl pyrrolidone.

4. The circulation system based on vinyl pyrrolidone according to claim 3, characterized in that: The polyvinyl pyrrolidone produced by the polyvinyl pyrrolidone device (4) is transported to the CNT conductive agent device (5) to react with the NMP raw material to produce a CNT conductive agent (6).

5. The circulation system based on vinyl pyrrolidone according to claim 1, characterized in that: A feed pipe (9) is arranged on the upper side of the acetylene recovery device (2), a plurality of discharge holes (10) are provided at the bottom of the feed pipe (9), a plurality of straight pipes (13) are inserted into the discharge holes (10), the lower ends of the straight pipes (13) are connected to the guide tubes (14), the lower ends of the guide tubes (14) are connected to the discharge pipe (15), and a plurality of dispersion pipes (21) are arranged on the lower side of the discharge pipe (15).

6. The circulation system based on vinyl pyrrolidone according to claim 5, characterized in that: The plurality of straight tubes (13) are distributed in a ring shape, and the conduit (14) is in an inclined state.

7. The circulation system based on vinyl pyrrolidone according to claim 6, characterized in that: The upper end of the straight pipe (13) is inserted into the extension sleeve (12), the upper side of the extension sleeve (12) is connected to the plug sleeve (11), and the plug sleeve (11) is sleeved on the lower side of the feed pipe (9).

8. The circulation system based on vinyl pyrrolidone according to claim 7, characterized in that: A sealing ring (22) is sleeved on the upper end of the straight tube (13).

9. The circulation system based on vinyl pyrrolidone according to claim 8, characterized in that: A shunt pipe (16) is inserted at the center of the feed pipe (9), the lower side of the shunt pipe (16) is connected to a hollow cylinder (17), a plurality of connecting pipes (18) are arranged on the lower side of the hollow cylinder (17), the lower side of the connecting pipe (18) is connected to an annular pipe (19), and a plurality of drip pipes (20) are arranged on the lower side of the annular pipe (19).

10. The circulation system based on vinyl pyrrolidone according to claim 9, characterized in that: The annular pipe (19) is located between a plurality of discharge pipes (15).

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