Low-energy-consumption vinyl chloride dehydrating device

Abstract

The utility model discloses a low energy consumption vinyl chloride water trap, including the separator, the separator is connected with first purifier and waste liquid collection jar through second pipeline and thirteenth pipeline respectively, first purifier is connected with machine front cooler, rectification system and waste liquid collection jar through third pipeline, eleventh pipeline and twelfth pipeline respectively, machine front cooler is connected with machine front separator through fourth pipeline, machine front separator is connected with booster through fifth pipeline, the utility model discloses drying vinyl chloride by adopting temperature swing adsorption technology, reduce the water content among vinyl chloride, and the degree of automation is high, and personnel maintenance quantity is small, and the water molecule separated by temperature swing adsorption is in the form of liquid water and is automatically discharged, and the water is discharged in time, and the water separated by temperature swing adsorption device is neutral, can directly enter the process sewer pipe network, will not cause pipeline and equipment blockage, and the practicality is strong.

Description

Technical Field

[0001] This utility model belongs to the technical field of vinyl chloride production equipment, and in particular relates to a low-energy vinyl chloride dewatering device. Background Technology

[0002] Currently, vinyl chloride is typically produced using the calcium carbide process and the ethylene process. The acetylene content in vinyl chloride produced by the calcium carbide process is extremely low, and the high-boiling point is less than 10 ppm. In terms of organic impurities, the quality of vinyl chloride produced by the calcium carbide process is higher than that produced by the ethylene process. However, because the water content of vinyl chloride produced by the calcium carbide process is higher than that produced by the ethylene process, excessive water content in the vinyl chloride during the polymerization of vinyl chloride into polyvinyl chloride (PVC) can lead to corrosion of steel equipment and the formation of Fe3+. The presence of Fe3+ in the vinyl chloride monomer will cause the polymerized PVC resin to turn yellow or form black spots, and will reduce the thermal stability of PVC. The presence of Fe3+ can also cause oxygen and vinyl chloride to form peroxides. These peroxides can repeat the above hydrolysis process and also trigger the polymerization of vinyl chloride, resulting in PVC with a lower degree of polymerization. This can cause blockage of the tray components, forcing a shutdown.

[0003] Acetylene and hydrogen chloride gas undergo a mixing and dehydration process before entering a converter to generate a vinyl chloride mixture. This mixture is then purified and sent to the vinyl chloride compression process. After compression, the gas is condensed and distilled, with the qualified refined monomers sent to the polymerization section. Because the material comes into contact with water-containing substances during the acid washing, water washing, and alkali washing processes in the purification phase, the vinyl chloride dehydration process must follow the purification process. Currently used conventional dehydration methods include organic pre-cooler condensation + acid mist collector dehydration, crude vinyl chloride after the total condenser using density difference for stratification dehydration, gas-phase vinyl chloride solid alkali drying, and liquid-phase vinyl chloride rod alkali drying. When using solid alkali for dehydration, the solid alkali needs to be crushed before loading to increase the contact area between the solid alkali and the gas. Using rod alkali for liquid-phase vinyl chloride drying also has disadvantages such as liquid flow deviation, rod alkali surface crusting, and low dehydration efficiency. Furthermore, both methods generate large amounts of waste alkali solution. This alkali solution is highly concentrated and contains many impurities, making it unusable by the system. It can easily crystallize and clog the alkali discharge pipeline, causing significant inconvenience to production. Utility Model Content

[0004] The purpose of this invention is to provide a low-energy vinyl chloride dewatering device to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: A low-energy vinyl chloride dewatering device includes a separator. The separator is connected to a first purifier and a waste liquid collection tank via a second pipeline and a thirteenth pipeline, respectively. The first purifier is connected to an organic pre-cooler, a distillation system, and a waste liquid collection tank via a third pipeline, an eleventh pipeline, and a twelfth pipeline, respectively. The pre-cooler is connected to the organic pre-separator via a fourth pipeline. The pre-separator is connected to a booster compressor via a fifth pipeline. The booster compressor is connected to an organic post-cooler via a sixth pipeline. The post-cooler is connected to the organic post-separator via a seventh pipeline. The post-separator is connected to a second purifier via an eighth pipeline. The second purifier is connected to a heater and a waste liquid collection tank via a ninth pipeline and a first pipeline, respectively. The heater is connected to the first purifier via a tenth pipeline.

[0006] Preferably, a programmable valve is installed on the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth and thirteenth pipelines.

[0007] Preferably, an overflow pipe is provided near the top of the inner cavity of the waste liquid collection tank, and the end of the overflow pipe extends to the outside of the waste liquid collection tank.

[0008] Preferably, the waste liquid collection tank is equipped with a liquid level monitoring device.

[0009] Preferably, the booster compressor has an external cooling system and uses a shell-and-tube heat exchanger.

[0010] Preferably, both the first purifier and the second purifier are provided with a grate plate at the bottom, and the grate plate is made of titanium mesh material.

[0011] The low-energy vinyl chloride dewatering device of this utility model has the following advantages:

[0012] This invention uses temperature-switching adsorption technology to dry vinyl chloride, reducing the water content in vinyl chloride. It has a high degree of automation, requires little personnel maintenance, and the water molecules separated by temperature-switching adsorption are automatically discharged in liquid form, which is timely. In addition, the water separated by the temperature-switching adsorption device is neutral and can be directly introduced into the process water supply network without causing blockage of pipelines and equipment, making it highly practical. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the waste liquid collection tank in this utility model.

[0016] The markings in the diagram are as follows: 1. Separator; 2. Programmable valve; 3. First pipeline; 4. Overflow pipe; 5. Liquid level monitoring device; 6. First purifier; 7. Distillation system; 8. Waste liquid collection tank; 9. Pre-cooler; 10. Pre-separator; 11. Booster; 12. Aftercooler; 13. After-separator; 14. Second purifier; 15. Heater; 16. Second pipeline; 17. Third pipeline; 18. Fourth pipeline; 19. Fifth pipeline; 20. Sixth pipeline; 21. Seventh pipeline; 22. Eighth pipeline; 23. Ninth pipeline; 24. Tenth pipeline; 25. Eleventh pipeline; 26. Twelfth pipeline; 27. Thirteenth pipeline. Detailed Implementation

[0017] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0018] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0021] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0022] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a low-energy vinyl chloride dewatering device.

[0023] like Figure 1-2 As shown, this utility model discloses a low-energy vinyl chloride dewatering device, comprising a separator 1. The separator 1 is connected to a first purifier 6 and a waste liquid collection tank 8 via a second pipe 16 and a thirteenth pipe 27, respectively. The first purifier 6 is connected to an organic precooler 9, a distillation system 7, and the waste liquid collection tank 8 via a third pipe 17, an eleventh pipe 25, and a twelfth pipe 26, respectively. An overflow pipe 4 is provided near the top of the inner cavity of the waste liquid collection tank 8, with its end extending to the outside of the waste liquid collection tank 8. The overflow pipe 4 effectively prevents the waste liquid collection tank 8 from overflowing due to excessive waste liquid collection. A liquid level monitoring device 5 is installed on the waste liquid collection tank 8, which allows for real-time monitoring of the liquid level in the waste liquid collection tank 8, facilitating timely treatment of the waste liquid by staff. This device is highly practical.

[0024] The pre-cooler 9 is connected to the pre-separator 10 via the fourth pipe 18. The pre-separator 10 is connected to the booster compressor 11 via the fifth pipe 19. The booster compressor 11 is externally cooled and uses a shell-and-tube heat exchanger. The oil cooling part of the booster compressor 11 has been changed from gas purging type to external cooling. The form of the external cooler has changed from the initial plate heat exchanger to the final shell-and-tube heat exchanger, which improves the oil cooling heat exchange effect, solves the operation problem of the booster compressor 11, and improves the operating rate of the whole set of equipment. The booster 11 is connected to the organic aftercooler 12 via the sixth pipe 20. The organic aftercooler 12 is connected to the organic after separator 13 via the seventh pipe 21. The organic after separator 13 is connected to the second purifier 14 via the eighth pipe 22. The second purifier 14 is connected to the heater 15 and the waste liquid collection tank 8 via the ninth pipe 23 and the first pipe 3 respectively. The heater 15 is connected to the first purifier 6 via the tenth pipe 24. The first pipe 3, the second pipe 16, the third pipe 17, the fourth pipe 18, the fifth pipe 19, the sixth pipe 20, the seventh pipe 21, the eighth pipe 22, the ninth pipe 23, the tenth pipe 24, the eleventh pipe 25, the twelfth pipe 26 and the thirteenth pipe 27 are all equipped with programmable valves 2. Both the first purifier 6 and the second purifier 14 are equipped with grate plates at the bottom, which are made of titanium mesh. Due to the long-term and high-flow-rate scouring of water-containing gas, the bottom grate plates were damaged, and the desiccant entered the device with the airflow, causing serious losses. This problem was solved by using titanium mesh, which has high strength and is resistant to impact and corrosion, as the grate plate.

[0025] The working principle of this low-energy vinyl chloride dehydration device is as follows: This invention utilizes the special selective adsorption properties of a dedicated desiccant for moisture and impurities in a mixed gas. Furthermore, the desiccant's adsorption capacity varies significantly under different pressure and temperature conditions, thereby achieving the separation and purification of the water-containing mixed gas. At lower temperatures, the desiccant adsorbs moisture and impurities; heating the desiccant causes desorption of moisture and impurities, regenerating the desiccant for reuse.

[0026] The aqueous vinyl chloride mixture from the compression process first enters the gas-liquid separator to remove free moisture. The free moisture then enters the waste liquid collection tank 8 through the thirteenth pipeline 27. The aqueous vinyl chloride mixture then enters the first purifier 6 for deep adsorption and separation of moisture and impurities. The resulting product gas is discharged from the outlet of the first purifier 6 and output to the distillation system. After the moisture and impurities adsorbed by the purifier reach a certain level, the purifier enters the desorption and regeneration process. After completing the desorption and regeneration, the purifier enters the next adsorption and regeneration cycle. The purifier sequentially and staggeredly performs the "adsorption-regeneration-adsorption" cycle to achieve the purpose of continuously processing the raw material gas and outputting purified gas. The waste liquid generated by the purifier enters the waste liquid collection tank 8 through the first pipeline 3 and the twelfth pipeline 26.

[0027] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A low-energy vinyl chloride dewatering device, characterized in that: The system includes a separator (1), which is connected to a first purifier (6) and a waste liquid collection tank (8) via a second pipeline (16) and a thirteenth pipeline (27), respectively. The first purifier (6) is connected to an organic precooler (9), a distillation system (7), and a waste liquid collection tank (8) via a third pipeline (17), an eleventh pipeline (25), and a twelfth pipeline (26), respectively. The precooler (9) is connected to an organic pre-separator (10) via a fourth pipeline (18), and the pre-separator (10) is connected to a fifth pipeline (19). A booster compressor (11) is connected to an organic aftercooler (12) via a sixth pipe (20). The organic aftercooler (12) is connected to an organic after separator (13) via a seventh pipe (21). The organic after separator (13) is connected to a second purifier (14) via an eighth pipe (22). The second purifier (14) is connected to a heater (15) and a waste liquid collection tank (8) via a ninth pipe (23) and a first pipe (3), respectively. The heater (15) is connected to a first purifier (6) via a tenth pipe (24).

2. The low-energy vinyl chloride dewatering device according to claim 1, characterized in that: A programmable valve (2) is installed on the first pipeline (3), the second pipeline (16), the third pipeline (17), the fourth pipeline (18), the fifth pipeline (19), the sixth pipeline (20), the seventh pipeline (21), the eighth pipeline (22), the ninth pipeline (23), the tenth pipeline (24), the eleventh pipeline (25), the twelfth pipeline (26), and the thirteenth pipeline (27).

3. The low-energy vinyl chloride dewatering device according to claim 1, characterized in that: An overflow pipe (4) is provided near the top of the inner cavity of the waste liquid collection tank (8), and the end of the overflow pipe (4) extends to the outside of the waste liquid collection tank (8).

4. The low-energy vinyl chloride dewatering device according to claim 1, characterized in that: The waste liquid collection tank (8) is equipped with a liquid level monitoring device (5).

5. The low-energy vinyl chloride dewatering device according to claim 1, characterized in that: The booster (11) is externally cooled, and the booster (11) uses a shell-and-tube heat exchanger.

6. The low-energy vinyl chloride dewatering device according to claim 1, characterized in that: Both the first purifier (6) and the second purifier (14) are provided with a grate plate at the bottom, and the grate plate is made of titanium mesh material.

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