A production device for adjusting the solid content of polyvinyl acetate

Abstract

This utility model belongs to the technical field of resin production equipment, specifically disclosing a production device for adjusting the solid content of polyvinyl acetate (PVC). The device includes a reaction tower, a feeding VAC valve group, and a dilution methanol valve group. A condenser assembly is installed at the top of the reaction tower, and the outlet of the condenser assembly is connected to the feeding VAC valve group via a pipeline. The outlet of the dilution methanol valve group is connected to the outlet of the reaction tower via a pipeline. This utility model provides a production device for adjusting the solid content of PVC. By setting a connecting pipeline between the feeding VAC valve group and the dilution methanol valve group, the distillate from the first tower is transported to the dilution methanol valve group, thereby diluting the PVC produced in the bottom of the tower. The solid content of the diluted PVC is effectively adjusted to better meet production requirements. Furthermore, this setup can reduce the steam consumption of the gas phase heat source in the second polymerization tower, thereby reducing overall energy consumption.

Description

Technical Field

[0001] This utility model relates to the technical field of resin production equipment, and in particular to a production device for adjusting the solid content of polyvinyl acetate. Background Technology

[0002] In the production of polyvinyl acetate (PVC), multiple polymerization towers are typically used for separation and purification. Polymerization tower one is used for preliminary separation of the PVC-methanol-vinyl acetate mixture produced in the polymerization reactor. PVC is produced at the bottom of the tower, while a mixture of methanol and vinyl acetate vapors is distilled from the top. The vinyl acetate-methanol distillate from the top of polymerization tower one enters polymerization tower two for further separation. In polymerization tower two, a combination of extraction and azeotropic distillation is used to obtain a methanol-water solution at the bottom and an aqueous vinyl acetate solution at the top.

[0003] With the continuous expansion of polyvinyl acetate (PVC) product varieties, different specifications and applications have placed diverse requirements on their concentration ranges to meet the specific needs of various application scenarios. In traditional production processes, PVC concentration is usually adjusted by using methanol supplied from the tank farm or recycling process as a diluent, which leads to a significant increase in methanol consumption.

[0004] In addition, the vapor-methanol mixture distilled from the top of the first polymerization tower needs to be fed into the second polymerization tower for separation. This process further increases the vapor heat source steam consumption of the second polymerization tower, resulting in an overall increase in energy consumption.

[0005] In summary, existing polyvinyl acetate production equipment suffers from high material consumption and high energy consumption. Utility Model Content

[0006] This invention provides a production device for adjusting the solid content of polyvinyl acetate, which can solve the problems of high material consumption and high energy consumption in the existing polyvinyl acetate production devices.

[0007] A production apparatus for adjusting the solid content of polyvinyl acetate includes a reaction tower, a feeding VAC valve group, and a dilution methanol valve group. A condensation component is provided on the top of the reaction tower. The outlet end of the condensation component is connected to the feeding VAC valve group through a pipeline. The outlet end of the dilution methanol valve group is connected to the outlet end of the reaction tower through a pipeline. A connecting pipe is provided between the feeding VAC valve group and the diluting methanol valve group.

[0008] Furthermore, a preheater is connected to the outlet end of the feeding VAC valve assembly.

[0009] Furthermore, the feeding VAC valve group includes a main pipe A, a main pipe B, a regulating valve group A, a regulating valve group B, and a valve assembly C. The regulating valve group A and the regulating valve group B are both located on the main pipe A, and the valve assembly C is located on the main pipe B. Both ends of the main pipe B are located on the main pipe A.

[0010] Furthermore, the main pipeline A includes branch pipelines A, B, C and D connected in sequence, and the regulating valve group A and regulating valve group B are respectively installed on branch pipeline B and branch pipeline C; The outlet end of the condenser assembly is connected to the inlet end of the branch pipe A, and the outlet end of the branch pipe D is connected to the preheater. The main pipeline B includes two interconnected branch pipelines N and E. The outlet end of the branch pipeline N is also connected to a branch pipeline F, and the outlet end of the branch pipeline F is connected to the inlet end of the branch pipeline C. The inlet end of branch pipe N is connected to the outlet end of branch pipe A, and the outlet end of branch pipe E is connected to the inlet end of branch pipe D. The valve assembly C includes valve A and valve B, which are respectively installed on branch pipe N and branch pipe E.

[0011] Furthermore, the branch pipe B is also provided with a branch pipe G, the outlet end of which is connected to the connecting pipe.

[0012] Furthermore, the outlet end of the reaction tower is connected to a resin feed tower pipeline, and the outlet end of the diluted methanol valve group is connected to the resin feed tower pipeline.

[0013] Furthermore, the inlet of the diluted methanol valve assembly is also connected to the tank plant's methanol and CC-methanol via pipelines.

[0014] Furthermore, valves are provided on the pipeline between the diluted methanol valve group and the methanol in the tank plant, and on the pipeline between the diluted methanol valve group and the CC-methanol.

[0015] Furthermore, the methanol dilution valve assembly includes a main pipeline C, a main pipeline D, a regulating valve assembly D, a regulating valve assembly E, and a valve assembly F; The regulating valve group D and regulating valve group E are both located on the main pipeline C, the valve assembly F is located on the main pipeline D, and both ends of the main pipeline D are located on the main pipeline C.

[0016] Furthermore, the main pipeline C includes branch pipelines H, I, J and K connected in sequence, and the regulating valve group D and regulating valve group E are respectively installed on branch pipeline I and branch pipeline J; The main pipeline D includes two connected branch pipelines L and M. The inlet end of the branch pipeline L is connected to the outlet end of the branch pipeline H, and the outlet end of the branch pipeline M is connected to the inlet end of the branch pipeline K. The valve assembly F includes valve C and valve D, which are respectively installed on the branch pipe L and the branch pipe M; The outlet end of the connecting pipe is connected to branch pipe I.

[0017] Compared with the prior art, the present invention has, but is not limited to, the following beneficial effects: 1. This utility model provides a production apparatus for adjusting the solid content of polyvinyl acetate (PVC), comprising a reaction tower, a feeding VAC valve group, and a dilution methanol valve group. Specifically, a condensation assembly is provided at the top of the reaction tower to condense the mixed vapor of methanol and vinyl acetate distilled from the top of the reaction tower. After condensation, the resulting distillate enters the feeding VAC valve group. A connecting pipe is installed between the feeding VAC valve group and the dilution methanol valve group to transport the distillate to the dilution methanol valve group, thereby diluting the PVC produced in the bottom of the tower. The solid content of the diluted PVC is effectively adjusted to better meet production requirements. Furthermore, this setup can reduce the vapor consumption of the gaseous heat source in the polymerization tower, thereby reducing overall energy consumption. Specifically, the vapor consumption of the gaseous heat source is an important energy consumption indicator during the operation of the polymerization tower. This setup effectively reduces the amount of material entering the polymerization tower, thus effectively reducing this portion of steam consumption and achieving the goal of reducing overall energy consumption. This not only helps companies save production costs, but also aligns with the current industry development trend of energy conservation, emission reduction, and green production.

[0018] 2. This utility model provides a production device for adjusting the solid content of polyvinyl acetate. The production device has a reasonable structural design and the components are closely matched. The condensation component can efficiently complete the condensation of mixed vapor. The feeding VAC valve group and the diluent methanol valve group are connected by pipelines to realize the smooth transportation and utilization of the distillate from the tower, ensuring the stability and continuity of the entire production process and effectively improving the production efficiency and product quality of polyvinyl acetate. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A schematic diagram of a production apparatus for adjusting the solid content of polyvinyl acetate provided by this utility model; Figure 2A schematic diagram of a production apparatus for adjusting the solid content of polyvinyl acetate provided by this utility model; Figure 3 A schematic diagram of the feeding VAC valve group of a production device for adjusting the solid content of polyvinyl acetate provided by this utility model; Figure 4 This is a schematic diagram of the structure of a methanol dilution valve group in a production device for adjusting the solid content of polyvinyl acetate, which is provided by this utility model.

[0020] Explanation of reference numerals in the attached figures: 100. Reaction tower; 101. Condensation assembly; 1. Feed VAC valve assembly; 2. Methanol dilution valve assembly; 3. Connecting pipes; 4. Resin feed line to tower 1; 5. Preheater; 111. Branch pipe A; 112. Branch pipe B; 113. Branch pipe C; 114. Branch pipe D; 115. Branch pipe G; 121. Branch pipe N; 122. Branch pipe E; 123. Branch pipe F; 131. Valve E; 132. Valve F; 133. Valve G; 135. Control valve A; 141. Valve H; 142. Valve I; 143. Valve J ; 144, Valve K; 151, Valve A; 152, Valve B; 21, Tanker Methanol; 22, CC-302 Methanol; 261, Branch Pipe H; 262, Branch Pipe I; 263, Branch Pipe J; 264, Branch Pipe K; 271, Branch Pipe L; 272, Branch Pipe M; 273, Branch Pipe O; 284, Branch Pipe P; 251, Valve C; 252, Valve D; 281, Valve L; 282, Valve M; 283, Valve N; 285, Valve O; 291, Valve P; 292, Valve Q; 293, Valve R. Detailed Implementation

[0021] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0022] like Figures 1 to 4 As shown, the present invention provides a production device for adjusting the solid content of polyvinyl acetate, including a reaction tower 100, a feeding VAC valve group 1, and a dilution methanol valve group 2. A condensation component 101 is provided on the top of the reaction tower 100. The outlet end of the condensation component 101 is connected to the feeding VAC valve group 1 through a pipe. The outlet end of the dilution methanol valve group 2 is connected to the outlet end of the reaction tower 100. A connecting pipe 3 is provided between the feeding VAC valve group 1 and the diluting methanol valve group 2; In the production unit that adjusts the solid content of polyvinyl acetate This invention provides a highly efficient production apparatus specifically designed for adjusting the solid content of polyvinyl acetate. The apparatus mainly consists of three core components: a reaction tower 100 (commonly referred to as the polymerization tower), a feed VAC valve group 1, and a methanol dilution valve group 2. Specifically, a condenser assembly 101 is specially designed and installed at the top of the reaction tower 100. Its main function is to efficiently condense the mixed vapor of methanol and vinyl acetate distilled from the top of the reaction tower 100. After condensation, this mixed vapor is converted into a tower distillate, which then flows into the feed VAC valve group 1 for further processing.

[0023] To ensure smooth transport and subsequent processing of the distillate, a connecting pipe 3 is specially installed between the feed VAC valve group 1 and the methanol dilution valve group 2. Through this pipe, the distillate from the first column can be effectively transported to the methanol dilution valve group 2. In the methanol dilution valve group 2, the distillate precisely dilutes the polyvinyl acetate produced in the column bottom, thereby effectively and accurately adjusting the solid content of the polyvinyl acetate to better meet the specific needs of the actual production process.

[0024] Furthermore, this device offers a significant additional advantage: it can substantially reduce the consumption of vaporized heat source steam during the operation of the polymerization tower. Specifically, the consumption of vaporized heat source steam is a crucial indicator of energy efficiency during the operation of the polymerization tower. By implementing this device, the amount of material entering the polymerization tower can be effectively reduced, thereby significantly decreasing steam consumption in this stage and ultimately achieving a reduction in overall energy consumption.

[0025] This design not only helps companies save production costs and improve economic efficiency from the source, but also aligns closely with the current industry development trend of energy conservation, emission reduction, and green production, providing strong support for the sustainable development of enterprises.

[0026] like Figures 1 to 4 As shown, in some embodiments of this utility model, the outlet end of the reaction tower 100 is connected to the resin feed tower pipeline 4, and the outlet end of the dilution methanol valve group 2 is connected to the resin feed tower pipeline 4. The resin feed tower pipeline 4 is used to receive polyvinyl acetate from the outlet of reaction tower 100. Diluent (feed methanol supplied by tank plant methanol 21, feed methanol supplied by CC-302 methanol 22, or distillate from the first tower supplied by connecting pipeline 3) is supplied into the resin feed tower pipeline 4 through the dilution methanol valve group 2 to adjust the polyvinyl acetate to the required concentration range. During the transportation process, this pipeline ensures a stable flow of materials, preventing blockages or leaks and ensuring the continuity and stability of the entire production process. Simultaneously, the design of the resin delivery tower pipeline 4 also considers the characteristics of the material, employing appropriate materials and pipe diameters to meet the transportation requirements of polyvinyl acetate, thus providing a reliable material supply for subsequent production stages.

[0027] like Figures 1 to 4 As shown, in some embodiments of this utility model, a preheater 5 is connected to the outlet end of the feeding VAC valve group 1; the function of the preheater 5 is to preheat the distillate flowing out of the feeding VAC valve group 1.

[0028] like Figures 1 to 4 As shown, in some embodiments of this utility model, the feeding VAC valve group 1 includes a main pipe A, a main pipe B, a regulating valve group A, a regulating valve group B, and a valve assembly C. The regulating valve group A and the regulating valve group B are both located on the main pipe A, the valve assembly C is located on the main pipe B, and both ends of the main pipe B are located on the main pipe A. The feed VAC valve assembly 1, through its structural design, enables precise regulation of the distillate flow rate of the first tower. Control valve assemblies A and B can control the flow rate at different locations on the main pipeline A according to production needs, thereby ensuring a stable and process-compliant distillate flow rate entering the preheater 5. Valve assembly C, located on the main pipeline B, allows for further fine-tuning of branch flow rates, enhancing the overall flexibility of the valve assembly in flow control. The parallel design, with both ends of the main pipeline B connected to the main pipeline A, enables rapid switching or adjustment in case of a failure in a control valve or valve assembly, ensuring production continuity and reducing the risk of production interruptions due to equipment problems.

[0029] like Figures 1 to 4 As shown, in some embodiments of this utility model, the main pipeline A includes branch pipelines A 111, B 112, C 113 and D 114 connected in sequence, and regulating valve group A and regulating valve group B are respectively installed on branch pipeline B 112 and branch pipeline C 113. The outlet end of the condenser assembly 101 is connected to the inlet end of branch pipe A 111, and the outlet end of branch pipe D 114 is connected to the preheater 5. The main pipeline B includes two connected branch pipelines N 121 and E 122. The outlet end of branch pipeline N 121 is also connected to branch pipeline F 123, and the outlet end of branch pipeline F 123 is connected to the inlet end of branch pipeline C 113. The inlet end of branch pipe N 121 is connected to the outlet end of branch pipe A 111, and the outlet end of branch pipe E 122 is connected to the inlet end of branch pipe D 114. Valve assembly C includes valve A 151 and valve B 152, which are respectively installed on branch pipe N121 and branch pipe E 122; The condenser assembly 101 is used to condense the steam generated during the production process.

[0030] Control valve group A and control valve group B can precisely control the flow rate of materials in branch pipe B 112 and branch pipe C 113, thereby ensuring the precise regulation of the distillate flow rate of the first tower, and thus ensuring the accuracy of the adjustment of the solid content of polyvinyl acetate in the production unit.

[0031] Preheater 5 preheats the material coming from branch pipe D 114 to bring it to a suitable reaction temperature, which is conducive to the smooth progress of subsequent reactions.

[0032] Branch pipe F 123 serves to divert and replenish materials, and the amount of material entering branch pipe C 113 can be adjusted according to actual production needs. Valves A 151 and B 152 control the on / off state and flow rate of materials in branch pipes N 121 and E 122, respectively, further ensuring the stability and flexibility of the entire production unit's operation.

[0033] like Figures 1 to 4 As shown, in some embodiments of this utility model, a branch pipe G 115 is also provided on the branch pipe B 112, and the outlet end of the branch pipe G 115 is connected to the connecting pipe 3. The regulating valve group A includes valves E 131, F 132 and G 133 arranged sequentially along the outflow direction of the distillate from the tower; the portion of the branch pipe B 112 located between valves E 131 and F 132 is designated as the conveying pipe A, and the conveying pipe A is connected to the branch pipe G 115; Branch pipe G 115 is used to connect branch pipe B 112 to connecting pipe 3, so that the distillate from one tower can be transported to the methanol dilution valve group 2 via connecting pipe 3.

[0034] like Figures 1 to 4 As shown, in some embodiments of this utility model, a regulating valve A 135 is also provided on the branch pipe G 115; The regulating valve A 135 can precisely control the flow rate of the first-tower distillate in the branch pipe G 115, ensuring that the amount of first-tower distillate delivered to the methanol dilution valve group 2 meets production requirements. The setting of the delivery pipe A allows the first-tower distillate to be partially diverted to the connecting pipe 3 through the branch pipe G 115 during the process of flowing between valve E 131 and valve F 132. This diversion design improves the flexibility of the production unit in distributing the first-tower distillate. At the same time, by adjusting the opening of valve A 135 and the valves in the regulating valve group A, precise control of different flow directions and flow rates of the first-tower distillate can be achieved, thereby better meeting the precise requirements for material flow rate during the adjustment of polyvinyl acetate solid content.

[0035] like Figures 1 to 4 As shown, in some embodiments of this utility model, the regulating valve group B includes valves H 141, I 142 and J 143 arranged sequentially along the outflow direction of the distillate from the tower. The portion of the branch pipe C 113 located between valves H 141 and I 142 is designated as the conveying pipe C, and valve K 144 is provided on the conveying pipe C. Valves H 141, I 142, and J 143 work together to adjust the flow rate of the distillate from the first tower through branch pipe C 113 in multiple stages according to actual production conditions. The installation of conveying pipe C provides a new flow path for the distillate from the first tower, and valve K 144 can precisely control the flow rate of the distillate entering conveying pipe C. This allows the entire production unit to more flexibly adjust the flow direction and flow rate of the distillate from the first tower, further meeting the precise requirements for material flow control during the adjustment of the solid content of polyvinyl acetate.

[0036] like Figures 1 to 4 As shown, in some embodiments of this utility model, the inlet end of the dilution methanol valve group 2 is also connected to the tank plant methanol 21 and CC-302 methanol 22 via pipelines.

[0037] like Figures 1 to 4 As shown, in some embodiments of this utility model, valves are provided on the pipeline between the dilution methanol valve group 2 and the tank plant methanol 21, and on the pipeline between the dilution methanol valve group 2 and CC-302 methanol 22. The valve on the pipeline between the methanol dilution valve group 2 and the methanol 21 in the tank plant is used to precisely control the flow rate of methanol 21 from the tank plant into the methanol dilution valve group 2; the valve on the pipeline between the methanol dilution valve group 2 and the CC-302 methanol 22 is used to precisely regulate the amount of CC-302 methanol 22 entering the methanol dilution valve group 2. The synergistic effect of these two valves allows for better dilution and blending of methanol to meet production requirements for adjusting the solid content of polyvinyl acetate.

[0038] like Figures 1 to 4 As shown, in some embodiments of this utility model, the methanol dilution valve group 2 includes a main pipeline C, a main pipeline D, a regulating valve group D, a regulating valve group E, and a valve assembly F. Both regulating valve group D and regulating valve group E are located on the main pipeline C, and valve assembly F is located on the main pipeline D. Both ends of the main pipeline D are located on the main pipeline C. Control valve groups D and E are distributed on the main pipeline C, enabling graded regulation of the methanol flow through the main pipeline C according to actual production needs, to meet the methanol dilution requirements at different solid content adjustment stages. Valve assembly F is installed on the main pipeline D; its opening and closing, and its degree of adjustment, allow for precise control of the methanol flow diverted from the main pipeline C to the main pipeline D. Working in conjunction with control valve groups D and E, it achieves more precise control of the methanol dilution process, thereby better meeting the precise methanol quantity control requirements during the polyvinyl acetate solid content adjustment process.

[0039] like Figures 1 to 4 As shown, in some embodiments of this utility model, the main pipeline C includes branch pipelines H 261, I 262, J 263 and K 264 connected in sequence, and regulating valve group D and regulating valve group E are respectively provided on branch pipeline I 262 and branch pipeline J 263. The main pipeline D includes connected branch pipelines L 271 and M 272. The inlet end of branch pipeline L 271 is connected to the outlet end of branch pipeline H 261, and the outlet end of branch pipeline M 272 is connected to the inlet end of branch pipeline K 264. Valve assembly F includes valve C 251 and valve D 252, which are respectively installed on branch pipe L271 and branch pipe M 272; Among them, the outlet end of branch pipe L 271 is also connected to branch pipe O 273, and the outlet end of branch pipe O 273 is connected to branch pipe J 263; Specifically, the inlet end of branch pipe H 261 is connected to methanol 21 in the tank plant and methanol 22 in CC-302, respectively, for receiving feed methanol from methanol 21 in the tank plant and methanol 22 in CC-302; the outlet end of branch pipe H 261 is connected to branch pipe I 262. The outlet end of branch pipe K 264 is connected to resin feed tower line 4, thereby achieving the purpose of diluting polyvinyl acetate by adding methanol.

[0040] like Figures 1 to 4 As shown, in some embodiments of this utility model, the outlet end of the connecting pipe 3 is connected to the branch pipe I 262. Specifically, the regulating valve group D includes valves L 281, M 282 and N 283 arranged sequentially along the material conveying direction. The portion of the branch pipe I 262 located between valves L 281 and M 282 is designated as the conveying pipe D. A branch pipe P 284 is connected to the conveying pipe D, and a valve O 285 is provided on the branch pipe P 284. The outlet end of connecting pipe 3 is connected to branch pipe P 284.

[0041] like Figures 1 to 4 As shown, in some embodiments of this utility model, the regulating valve group E includes valves P 291, Q 292 and R 293 arranged sequentially along the material conveying direction.

[0042] This invention provides a production device for adjusting the solid content of polyvinyl acetate. The device has a reasonable structural design and the components are closely coordinated. The condensation component can efficiently complete the condensation of mixed vapors. The feeding VAC valve group and the dilution methanol valve group are connected by pipelines to realize the smooth transportation and utilization of the distillate from the first tower, ensuring the stability and continuity of the entire production process and effectively improving the production efficiency and product quality of polyvinyl acetate.

[0043] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

[0044] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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 this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An apparatus for adjusting the solids content of polyvinyl acetate, characterized by, The system includes a reaction tower (100), a feed VAC valve group (1), and a methanol dilution valve group (2). A condenser assembly (101) is provided on the top of the reaction tower (100). The outlet end of the condenser assembly (101) is connected to the feed VAC valve group (1) through a pipe. The outlet end of the methanol dilution valve group (2) is connected to the outlet end of the reaction tower (100) through a pipe. A connecting pipe (3) is provided between the feeding VAC valve group (1) and the diluting methanol valve group (2).

2. The apparatus for adjusting the solid content of polyvinyl acetate according to claim 1, wherein The outlet end of the feeding VAC valve group (1) is connected to a preheater (5).

3. The apparatus for adjusting the solid content of polyvinyl acetate according to claim 2, wherein The feeding VAC valve group (1) includes a main pipe A, a main pipe B, a regulating valve group A, a regulating valve group B (14) and a valve assembly C. The regulating valve group A and the regulating valve group B are both located on the main pipe A, and the valve assembly C is located on the main pipe B. Both ends of the main pipe B are located on the main pipe A.

4. The apparatus for adjusting the solid content of polyvinyl acetate according to claim 3, wherein The main pipeline A includes branch pipelines A (111), B (112), C (113) and D (114) connected in sequence. The regulating valve group A and regulating valve group B (14) are respectively installed on branch pipeline B (112) and branch pipeline C (113). The outlet end of the condenser assembly (101) is connected to the inlet end of the branch pipe A (111), and the outlet end of the branch pipe D (114) is connected to the preheater (5). The main pipe B includes a connected branch pipe N (121) and a branch pipe E (122). The outlet end of the branch pipe N (121) is also connected to a branch pipe F (123), and the outlet end of the branch pipe F (123) is connected to the inlet end of the branch pipe C (113). The inlet end of the branch pipe N (121) is connected to the outlet end of the branch pipe A (111), and the outlet end of the branch pipe E (122) is connected to the inlet end of the branch pipe D (114). The valve assembly C includes valve A (151) and valve B (152), which are respectively located on branch pipe N (121) and branch pipe E (122).

5. The apparatus for adjusting the solid content of polyvinyl acetate according to claim 4, wherein The branch pipe B (112) is also provided with a branch pipe G (115), and the outlet end of the branch pipe G (115) is connected to the connecting pipe (3).

6. The production apparatus for adjusting the solid content of polyvinyl acetate according to claim 1, characterized in that, The outlet end of the reaction tower (100) is connected to the resin feed tower pipeline (4), and the outlet end of the diluted methanol valve group (2) is connected to the resin feed tower pipeline (4).

7. The production apparatus for adjusting the solid content of polyvinyl acetate according to claim 1, characterized in that, The inlet of the dilution methanol valve group (2) is also connected to the tank plant methanol (21) and CC-302 methanol (22) respectively via pipelines.

8. The production apparatus for adjusting the solid content of polyvinyl acetate according to claim 7, characterized in that, Valves are provided on the pipeline between the dilution methanol valve group (2) and the methanol (21) at the tank plant, and on the pipeline between the dilution methanol valve group (2) and the CC-302 methanol (22).

9. The apparatus for adjusting the solid content of polyvinyl acetate according to claim 1, wherein The methanol dilution valve group (2) includes a main pipeline C, a main pipeline D, a regulating valve group D, a regulating valve group E, and a valve assembly F; The regulating valve group D and regulating valve group E are both located on the main pipeline C, the valve assembly F is located on the main pipeline D, and both ends of the main pipeline D are located on the main pipeline C.

10. The apparatus for adjusting the solid content of polyvinyl acetate according to claim 9, wherein The main pipeline C includes branch pipelines H (261), I (262), J (263) and K (264) connected in sequence. The regulating valve group D and regulating valve group E are respectively installed on branch pipeline I (262) and branch pipeline J (263). The main pipeline D includes a connected branch pipeline L (271) and a branch pipeline M (272). The inlet end of the branch pipeline L (271) is connected to the outlet end of the branch pipeline H (261), and the outlet end of the branch pipeline M (272) is connected to the inlet end of the branch pipeline K (264). The valve assembly F includes valve C (251) and valve D (252), which are respectively installed on the branch pipe L (271) and the branch pipe M (272); The outlet end of the connecting pipe (3) is connected to the branch pipe I (262).

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