A seed emulsion polymerization kettle with anti-plastic function

Abstract

The present invention belongs to the technical field of anti-plasticization of polymerization kettles, and specifically relates to a seed emulsion polymerization kettle with anti-plasticization function, which includes a seed emulsion polymerization kettle, a monomer feed main pipe of which is connected to a monomer feed regulating valve, and the monomer feed regulating valve is respectively connected to a monomer main pipe pneumatic valve and a monomer branch pipe, and the monomer main pipe pneumatic valve is connected to the seed emulsion polymerization kettle through a pipeline provided with a monomer main pipe flow limiting orifice plate at the port, and the monomer branch pipe is respectively connected to the quick-stop agent equalization pipeline and the safety valve remote pressure transmission short section. The present invention installs a monomer branch pipe after the monomer pipeline control valve of the seed emulsion polymerization kettle, and divides the monomer pipeline into 3 places to enter the polymerization kettle, wherein one monomer branch pipeline is connected to the quick-stop agent equalization horizontal pipe on the polymerization kettle kettle surface, and the other monomer branch pipeline is connected to the short section of the safety valve on the polymerization kettle kettle surface.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-plasticization of polymerization kettles, and in particular relates to a seed emulsion polymerization kettle with anti-plasticization function. Background Art

[0002] The specific process for preventing plasticization of the kettle surface short section of the existing seed emulsion paste resin polymerization kettle is as follows: the design of the kettle surface short section of the seed emulsion polymerization kettle is divided into two parts: the quick-stop agent equalizing pressure short section and the safety valve remote pressure transmission short section. In the original process design, the quick-stop agent equalizing pressure short section of the polymerization kettle is installed with a flushing water pipeline, and the safety valve remote pressure transmission short section in the original process design is not equipped with any anti-plasticization pipeline.

[0003] The specific process for preventing plasticization of the quick-stop agent equalizing pipeline of the polymerization kettle is as follows: after the reaction of each polymerization kettle is completed, during the flushing stage of the polymerization kettle condenser, the microcomputer contacts the on-site operator to manually open the quick-stop agent equalizing short section flushing water hand valve, the pipeline flushing time is about 400s, the flushing volume is about 300 kg, and the pipeline is kept flushing.

[0004] The specific process for preventing plasticization of the remote pressure transmission nipple of the polymerization kettle safety valve is as follows: the pipeline is cleaned and ensured to be used every time the condenser of the seed emulsion polymerization kettle is overhauled.

[0005] The existing technology and process are backward. The short joint of the remote pressure transmission of the polymerizer safety valve cannot prevent the blockage of plasticized materials due to the lack of flushing water pipeline. It will be blocked again in a short time after cleaning, resulting in the inability to display the remote pressure of the safety valve normally. When the pressure of the polymerizer is abnormal, the safety valve cannot be activated, and safe production cannot be guaranteed. It needs to be manually dismantled and cleaned again, which increases the maintenance time of the polymerizer and affects the feeding time of the polymerizer. The quick-stop agent pressure equalization of the polymerizer is a horizontal pipeline on site. After each kettle is flushed, the pipeline cannot be plasticized and is easily blocked. After the blockage, the pipeline pressure gauge cannot be detected normally. When the pressure of the polymerizer is abnormal, the quick-stop agent pressure equalization pipeline cannot be normally equalized, and the quick-stop agent cannot be added, causing the polymerizer to overheat and overpressure, resulting in abnormal accidents. Summary of the invention

[0006] In order to address the deficiencies in the prior art, the present invention provides a seed emulsion polymerization kettle with an anti-plasticization function to solve the process problem that the short section of the surface of the polymerization kettle for producing paste resin is extremely easy to plasticize, shorten the time for dismantling and clearing the pipeline of the polymerization kettle, improve the stable use capability of the safety accessories of the polymerization kettle and the utilization rate of the polymerization kettle in the process, and increase production.

[0007] The technical solution provided by the present invention is as follows:

[0008] A seed emulsion polymerization kettle with anti-plastic function, comprising a seed emulsion polymerization kettle, which has a monomer feed main pipe, a quick-stop agent equalizing pipeline and a safety valve remote pressure transmission short joint, the monomer feed main pipe is connected to the monomer feed regulating valve, the monomer feed regulating valve is respectively connected to the monomer main pipe pneumatic valve and the monomer branch pipe, the monomer main pipe pneumatic valve is connected to the seed emulsion polymerization kettle through a pipeline with a monomer main pipe limiting orifice plate at the port, the monomer branch pipe is respectively connected to the quick-stop agent equalizing pipeline and the safety valve remote pressure transmission short joint, and is used for anti-plasticizing the quick-stop agent equalizing pipeline and the safety valve remote pressure transmission short joint through monomer materials.

[0009] Based on the above technical scheme, a monomer branch pipe is installed after the control valve of the monomer pipeline of the seed emulsion polymerization kettle, and a flow limiting orifice plate (φ12-φ25) is installed at the pneumatic two-position valve behind the monomer branch pipe, and the monomer pipeline is divided into 3 places to enter the polymerization kettle. One of the monomer branch pipes is connected to the quick-stop agent flat pressure horizontal pipe on the surface of the polymerization kettle. A pneumatic valve can be installed at the end of the horizontal pipe to control the monomer feed, and a monomer spray nozzle is installed vertically on the horizontal pipe to flush and vaporize the cooling pipeline with a monomer jet. Another monomer branch pipe is connected to the short section of the safety valve on the surface of the polymerization kettle, and a pneumatic valve is installed at the end of the horizontal pipe to control the monomer feed and a flow limiting orifice plate (φ4-φ6) for monomer spraying and vaporizing cooling pipelines.

[0010] In addition, a flow limiting orifice plate is installed behind the pneumatic valve of the monomer feed pipeline of the polymerization kettle to limit the flow of the original monomer pipeline of the polymerization kettle. The monomer flow is controlled by a flow meter, which can provide accurate flow for the newly added flushing branch pipe. By increasing the opening of the inlet regulating valve, the amount of monomer entering is increased to ensure that the monomer amount of the polymerization kettle remains unchanged.

[0011] Specifically, the quickstop agent pressure-leveling pipeline includes:

[0012] Horizontally set short section of quick-stop pressure-equalizing pipeline;

[0013] A monomer spray nozzle horizontally arranged at an opening of one end of the quick-stop agent equalizing and pressure-smoothing pipeline short section, the monomer spray nozzle being connected in sequence to the first monomer flushing pneumatic valve, the pipeline branch pipe and the monomer branch pipe;

[0014] A condenser, which is connected to the other end opening of the short section of the quickstop equalization pressure pipeline and the emulsion polymerization kettle respectively;

[0015] And the quick-stop agent equalizing pressure pipeline, the flushing water pipeline, the polymerization kettle remote pressure gauge and the polymerization kettle on-site pressure gauge which are arranged on the quick-stop agent equalizing pressure pipeline short section are connected in sequence.

[0016] Specifically: the pipeline of the short section of the quick-stop agent flat-pressure pipeline is a DN100 pipeline; the monomer spray nozzle is The jet nozzle.

[0017] Based on the above technical solution, a pneumatic valve is installed at the cross pipe of the DN100 pipeline of the polymerization kettle to control the feeding and stopping procedures of the monomer before and after the reaction, to ensure that the gas phase monomer of the polymerization kettle cannot flow back and cause plasticization, and a pneumatic valve is added behind the DN100 flange cover. The jet nozzle is installed vertically at the pipeline inlet to ensure that the monomer has a sufficient flow rate when entering the DN100 horizontal pipe to meet the flushing requirements.

[0018] Specifically, the safety valve remote pressure transmission nipple comprises:

[0019] A safety valve pipeline cross pipe short section, one end of which is opened to connect to the monomer branch pipe through the second monomer flushing pneumatic valve, and a short section flow limiting orifice is arranged at the opening;

[0020] And a safety valve pipeline three-way short section, whose horizontal opening is connected to the other end opening of the safety valve pipeline cross pipe short section, the lower opening of the safety valve pipeline three-way short section is connected to the emulsion polymerization kettle, and the upper opening of the safety valve pipeline three-way short section is sequentially provided with a bursting disc, a safety valve body and an accident discharge pipeline.

[0021] Specifically: the pipeline of the safety valve pipeline cross pipe short section is a DN150 pipeline; the short section flow limiting orifice is Restriction orifice plate.

[0022] Based on the above technical solution, a pneumatic valve is added to the cross pipe of the polymerization DN150 pipeline to control the feeding and stopping procedures of the monomer before and after the reaction, to ensure that the gas phase monomer refluxes into the polymerization kettle to cause plasticization, and to add a pneumatic valve behind the DN150 flange cover. The flow limiting orifice plate has holes installed vertically at the pipeline inlet to ensure that sufficient flow of monomers enters the DN150 horizontal pipe to meet the flushing requirements.

[0023] Specifically, the main flow limiting orifice is Restriction orifice plate.

[0024] The present invention can solve the blockage of the short section of the quick-stop pressure-equalizing pipeline and the short section of the cross pipe of the safety valve pipeline of the emulsion paste resin polymerization kettle through the spraying means, can reduce the production time of the polymerization kettle affected by cleaning plasticized materials, eliminate the problem of plasticization of the short section on the surface of the polymerization kettle, improve the stable use ability of the safety accessories of the polymerization kettle and the utilization rate of the polymerization kettle, and increase the output. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the seed emulsion polymerization kettle with anti-plastic function provided by the present invention.

[0026] Attached Figure 1 The structures represented by the labels are listed below:

[0027] 1. Monomer feed main pipe, 2. Monomer feed regulating valve, 3. Monomer branch pipe, 4. Condenser, 5. Quick-stop agent equalizing pressure pipeline, 6. Flushing water pipeline, 7. Polymerization kettle remote pressure gauge, 8. Polymerization kettle on-site pressure gauge, 9. First monomer flushing pneumatic valve, 10. Pipeline branch pipe, 11. Monomer spray nozzle, 12. Quick-stop agent equalizing pressure pipeline short section, 13. Monomer main pipe pneumatic valve, 14. Monomer main pipe limiting orifice plate, 16. Accident discharge pipeline, 17. Safety valve body, 18. Bursting disc, 19. Safety valve pipeline three-way short section, 20. Emulsion polymerization kettle, 21. Second monomer flushing pneumatic valve, 22. Short section limiting orifice plate, 23. Safety valve pipeline cross pipe short section. DETAILED DESCRIPTION

[0028] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0029] In a specific embodiment, Figure 1 As shown, the seed emulsion polymerization kettle with anti-plastic function includes an emulsion polymerization kettle 20, which has a monomer feed main pipe 1, a quick-stop agent equalizing pipeline and a safety valve remote pressure transmission short joint, the monomer feed main pipe 1 is connected to the monomer feed regulating valve 2, the monomer feed regulating valve 2 is respectively connected to the monomer main pipe pneumatic valve 13 and the monomer branch pipe 3, the monomer main pipe pneumatic valve 13 is connected to the emulsion polymerization kettle 20 through a pipeline with a monomer main pipe limiting orifice plate 14 at the port, and the monomer branch pipe 3 is respectively connected to the quick-stop agent equalizing pipeline and the safety valve remote pressure transmission short joint, which is used for anti-plasticizing the quick-stop agent equalizing pipeline and the safety valve remote pressure transmission short joint through monomer materials. Based on this technical solution, a monomer branch pipe is installed after the control valve of the monomer pipeline of the seed emulsion polymerization kettle, and a flow limiting orifice plate (φ12-φ25) is installed at the pneumatic two-position valve behind the monomer branch pipe, and the monomer pipeline is divided into 3 places to enter the polymerization kettle. One of the monomer branch pipes is connected to the quick-stop agent pressure-leveling horizontal pipe on the surface of the polymerization kettle. A pneumatic valve can be installed at the end of the horizontal pipe to control the monomer feed, and a monomer spray nozzle is installed vertically on the horizontal pipe to flush and vaporize the cooling pipeline with a monomer jet. Another monomer branch pipe is connected to the short section of the safety valve on the surface of the polymerization kettle, and a pneumatic valve is installed at the end of the horizontal pipe to control the monomer feed and a flow limiting orifice plate (φ4-φ6) for monomer spraying and vaporizing cooling pipelines. In addition, a flow limiting orifice plate is installed behind the pneumatic valve of the monomer feed pipeline of the polymerization kettle to limit the flow of the original monomer pipeline of the polymerization kettle. The monomer flow is controlled by a flow meter, which can provide accurate flow for the newly added flushing branch pipe. By increasing the opening of the inlet regulating valve, the amount of monomer entering is increased to ensure that the monomer amount of the polymerization kettle remains unchanged.

[0030] In one embodiment, Figure 1As shown, the quick-stop agent equalizing pressure pipeline comprises: a quick-stop agent equalizing pressure pipeline short section 12 arranged horizontally; a monomer spray nozzle 11 arranged horizontally at the opening of one end of the quick-stop agent equalizing pressure pipeline short section 12, the monomer spray nozzle 11 is connected in sequence to the first monomer flushing pneumatic valve 9, the pipeline branch pipe 10 and the monomer branch pipe 3; a condenser 4, which is connected to the other end opening of the quick-stop agent equalizing pressure pipeline short section 12 and the emulsion polymerization kettle 20 respectively; and a quick-stop agent equalizing pressure pipeline 5, a flushing water pipeline 6, a polymerization kettle remote pressure gauge 7 and a polymerization kettle on-site pressure gauge 8 arranged on the quick-stop agent equalizing pressure pipeline short section 12.

[0031] In one embodiment, the pipeline of the quick-stop agent pressure-squeezing pipeline nipple 12 is a DN100 pipeline; the monomer spray nozzle 11 is Based on this technical solution, a pneumatic valve is installed at the cross pipe of the DN100 pipeline of the polymerization kettle to control the feeding and stopping procedures of the monomer before and after the reaction, ensuring that the gas phase monomer of the polymerization kettle cannot flow back and cause plasticization. The jet nozzle is installed vertically at the pipeline inlet to ensure that the monomer has a sufficient flow rate when entering the DN100 horizontal pipe to meet the flushing requirements.

[0032] In one embodiment, Figure 1 As shown, the safety valve remote pressure transmission nipple includes: a safety valve pipeline cross pipe nipple 23, one end of which is opened through the monomer branch pipe 3 connected to the second monomer flushing pneumatic valve 21, and a nipple flow limiting orifice 22 is arranged at the opening; and a safety valve pipeline three-way nipple 19, a horizontal opening of which is connected to the other end opening of the safety valve pipeline cross pipe nipple 23, the lower opening of the safety valve pipeline three-way nipple 19 is connected to the emulsion polymerization kettle 20, and the upper opening of the safety valve pipeline three-way nipple 19 is sequentially provided with a bursting disc 18, a safety valve body 17 and an accident discharge pipeline 16.

[0033] In one embodiment, the pipeline of the safety valve pipeline cross pipe short section 23 is a DN150 pipeline; the short section flow limiting orifice is Based on this technical solution, a pneumatic valve is added to the cross pipe of the polymerization DN150 pipeline to control the feeding and stopping procedures of the monomer before and after the reaction, to ensure that the gas phase monomer refluxes into the polymerization kettle to cause plasticization, and a pneumatic valve is added behind the DN150 flange cover. The flow limiting orifice plate has holes installed vertically at the pipeline inlet to ensure that sufficient flow of monomers enters the DN150 horizontal pipe to meet the flushing requirements.

[0034] The seed emulsion polymerization reactor with anti-plastic function provided by the present invention was used for production test, and the situation before and after the transformation was compared and statistically analyzed, and the data are shown in the following Table 1:

[0035] Table 1

[0036]

[0037] As can be seen from Table 1, the present invention has obvious advantages in maintenance work time. The two technologies have different times for removing and clearing plasticizers. The spraying method of the present invention can solve the blockage of the short section of the emulsion paste resin polymerization kettle, and can reduce the production time of the polymerization kettle affected by cleaning plasticizers. Specifically, 20 kettles are dismantled and cleared once, each time takes 2 hours, once every 10 days, and each kettle can save 6 hours per month. The maintenance time can be saved every year, and 72 more kettles can be produced each year. The polymerization kettle can produce 700 tons of products more each year.

[0038] Table 2

[0039]

[0040] It can be seen from Table 2 that the quality of the resin produced by the seed emulsion polymerization kettle with anti-plastic function of the present invention is basically consistent with that produced by the original feeding process equipment, and both meet the national standard of superior products. The quality of the paste resin product produced by the present invention is stable.

[0041] It can be seen that the seed emulsion polymerization kettle with anti-plasticization function provided by the present invention can eliminate the problem of plasticization of the short section of the polymerization kettle surface, improve the stable use ability of the polymerization kettle safety accessories and the utilization rate of the polymerization kettle, and increase production.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A seed emulsion polymerization kettle with anti-plastic function, comprising a seed emulsion polymerization kettle (20), which has a monomer feed main pipe (1), a quick stop agent pressure equalization pipeline and a safety valve remote pressure transmission short section, characterized in that: The monomer feed main pipe (1) is connected to the monomer feed regulating valve (2), and the monomer feed regulating valve (2) is respectively connected to the monomer main pipe pneumatic valve (13) and the monomer branch pipe (3), and the monomer main pipe pneumatic valve (13) is connected to the seed emulsion polymerization kettle (20) through a pipeline provided with a monomer main pipe flow limiting orifice plate (14) at the port, and the monomer branch pipe (3) is respectively connected to the quick stop agent equalizing pipeline and the safety valve remote pressure short joint, and is used to prevent the quick stop agent equalizing pipeline and the safety valve remote pressure short joint from plasticizing through monomer materials; The quick-stop agent equalizing pipeline comprises: a quick-stop agent equalizing pipeline short section (12) arranged horizontally; and a monomer spray nozzle (11) arranged horizontally at an opening at one end of the quick-stop agent equalizing pipeline short section (12), wherein the monomer spray nozzle (11) is connected in sequence to a first monomer flushing pneumatic valve (9), a pipeline branch pipe (10) and the monomer branch pipe (3); The safety valve remote pressure transmission nipple comprises a safety valve pipeline cross pipe nipple (23), one end of which is opened to communicate with the monomer branch pipe (3) through a second monomer flushing pneumatic valve (21), and a nipple flow limiting orifice (22) is arranged at the opening; The quick-stop agent equalizing pipeline further comprises: a condenser (4), which is connected to the other end opening of the quick-stop agent equalizing pipeline short section (12) and the emulsion polymerization kettle (20); and sequentially connected to the quick-stop agent equalizing pressure pipeline (5), the flushing water pipeline (6), the polymerization kettle remote pressure gauge (7) and the polymerization kettle on-site pressure gauge (8) arranged on the quick-stop agent equalizing pressure pipeline short section (12); The safety valve remote pressure transmission nipple further comprises: a safety valve pipeline three-way nipple (19), whose horizontal opening is connected to the other end opening of the safety valve pipeline cross pipe nipple (23), the lower opening of the safety valve pipeline three-way nipple (19) is connected to the emulsion polymerization kettle (20), and the upper opening of the safety valve pipeline three-way nipple (19) is sequentially provided with a bursting disc (18), a safety valve body (17) and an accident discharge pipeline (16); The pipeline of the quick-stop agent equalizing pipeline short section (12) is a DN100 pipeline; the monomer spray nozzle (11) is a jet nozzle of φ4-φ6; The pipeline of the safety valve pipeline cross pipe short section (23) is a DN150 pipeline; the short section flow limiting orifice plate is a φ4-φ6 flow limiting orifice plate.

2. The seed emulsion polymerization kettle with anti-plastic function according to claim 1, characterized in that: The main flow limiting orifice plate is a flow limiting orifice plate with a diameter of φ12-φ25.

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