Online adding three monomer cation device for five-kettle process

Abstract

The application discloses a kind of five cauldron process online adding three monomer cation device, including first esterification kettle, second esterification kettle, first pre-condensation kettle, second pre-condensation kettle, final polycondensation kettle, process column, first esterification conveying pump, pre-condensation filter and melt filtration system, first esterification kettle and second esterification kettle between being provided with batching pipeline, further including three monomer preparation system and three monomer online injection system, three monomer online injection system is located on batching pipeline, dynamic mixer and pneumatic valve are arranged on the batching pipeline between three monomer online injection system and second esterification kettle, the material of three monomer preparation system is injected into connecting pipeline by three monomer online injection system, then, after being mixed by dynamic mixer, output flow is controlled by controlling pneumatic valve. Five cauldron process can be quickly realized from production extinction product to production cation product transformation, so that the production capacity and quality of product are guaranteed, and maximum profit is created for enterprise.

Description

Technical Field

[0001] This invention relates to the technical field of cation production, and specifically to a five-reactor process for online addition of three monomeric cations. Background Technology

[0002] In the spinning process, the production of cationic products generally requires a three-reactor process or a diester horizontal reactor process. However, many existing spinning enterprises still use the original five-reactor process equipment from the China Textile Academy. This existing equipment lacks an online cationic addition device, limiting its production to ordinary semi-dull or full-dull products and preventing the production of cationic products. For these enterprises, replacing the entire five-reactor process with a three-reactor process is too costly and difficult to implement. Furthermore, the transition to producing cationic and semi-dull products is challenging. Therefore, it is necessary to modify the existing five-reactor process equipment from the China Textile Academy to enable a rapid and low-cost transition to producing cationic and semi-dull products, maximizing profits for enterprises. Summary of the Invention

[0003] In order to solve one or more technical problems existing in the prior art, the purpose of this application is to provide a five-reactor process online addition device for three monomer cations, which enables the five-reactor process to quickly transform from the production of matting products to the production of cation products, ensuring the production capacity and quality of the products, and maximizing the profits for enterprises.

[0004] To solve the aforementioned technical problems, this application adopts the following technical solution:

[0005] A five-reactor process for online addition of three monomeric cations includes a first esterification reactor, a second esterification reactor, a first pre-condensation reactor, a second pre-condensation reactor, a final polycondensation reactor, a process tower, a first esterification transfer pump, a pre-condensation filter, and a melt filtration system. The first esterification reactor, the second esterification reactor, the first pre-condensation reactor, the second pre-condensation reactor, and the final polycondensation reactor are connected in series via pipelines. The process tower is connected to the first esterification reactor and the second esterification reactor. The melt in the second pre-condensation reactor is injected into the pre-condensation filter by the first esterification transfer pump for filtration before being injected into the final polycondensation reactor. Finally, it is filtered by the melt filtration system and then discharged into the final polycondensation reactor. The material is transported through pipelines to the spinning booster pump, and then distributed to various dosage pumps for the spinneret assembly to produce yarn. A batching pipeline is provided between the first esterification reactor and the second esterification reactor. The system also includes a three-monomer preparation system and a three-monomer online injection system. The three-monomer online injection system is located on the batching pipeline. A dynamic mixer and a pneumatic valve are provided on the batching pipeline between the three-monomer online injection system and the second esterification reactor. The material prepared by the three-monomer preparation system is injected into the connecting pipeline through the three-monomer online injection system, and then enters the dynamic mixer for mixing. The output flow rate is controlled by controlling the pneumatic valve.

[0006] Preferably, the three-monomer online injection system includes a three-monomer flow meter and two three-monomer injection valves connected in series on the dispensing pipeline. The two three-monomer injection valves are connected to the three-monomer preparation system through the three-monomer flow meter.

[0007] Preferably, the batching pipeline is further provided with an EG injection system, the EG injection system including an EG delivery pipeline, two EG injection valves connected in series on the batching pipeline, and a flow regulating valve on the EG delivery pipeline. The two EG injection valves are connected to the EG delivery pipeline. The EG injection valves are located at the front end of the three-unit injection valve. A first static mixer is provided between the EG injection valves and the three-unit injection valve.

[0008] Preferably, a second static mixer is provided between the three monomer injection valve and the dynamic mixer.

[0009] Preferably, a second esterification pump and an esterification flow meter are sequentially installed on the feed pipeline between the first esterification reactor and the three monomer online injection system, and two second esterification pumps are arranged in parallel.

[0010] Preferably, the three-monomer preparation system includes a three-monomer slurry preparation tank, a three-monomer slurry delivery pump, a three-monomer reaction tank, a three-monomer reaction tank heat medium heating pump, a three-monomer solution filter, a three-monomer intermediate cooling adjustment tank, a three-monomer finished product filter, a three-monomer finished product tank, and a three-monomer finished product feeding pump.

[0011] Preferably, the melt filtration system includes two melt transfer pumps connected to the discharge pipe of the final polycondensation reactor via a three-way pipe, and a dual polyester filter located at the discharge end of the melt transfer pumps.

[0012] Preferably, it also includes a heat transfer system, and all the added material conveying pipelines are jacketed pipes, which are connected to the heat transfer system.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] A three-monomer online injection system connects the mixing pipeline between the first and second esterification reactors to the three-monomer preparation system. This allows the three monomers to be mixed with the esterified product within the mixing pipeline before being injected into the second esterification reactor. This enables the existing five-reactor process unit at the China Textile Academy to produce not only ordinary semi-dull or full-dull products but also cationic products. Production of cationic products no longer requires equipment replacement, making it easier to promote and enabling a rapid and low-cost transformation of the existing China Textile Academy five-reactor process unit to produce cationic and semi-dull products, maximizing profits for enterprises. However, simply mixing the products directly in the mixing pipeline and then injecting them into the second esterification reactor for stirring can easily lead to uneven reaction, resulting in excessively high agglomeration rates, incomplete reaction, and large annual fluctuations in the final melt, affecting product quality. Therefore, a dynamic mixer was added to the mixing pipeline to ensure thorough mixing of the two melts, resulting in a more uniform melt reaction within the second esterification reactor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] In the diagram: 1. Esterification flow meter; 2. Second esterification transfer pump; 3. First esterification reactor; 4. Second esterification reactor; 5. First pre-condensation reactor; 6. Process tower; 7. Second pre-condensation reactor; 8. Final polycondensation reactor; 9. Pre-condensation filter; 10. First esterification transfer pump; 11. Pneumatic valve; 12. Dynamic mixer; 13. Second static mixer; 14. Feeding pipeline; 15. Shell and tube heat exchanger; 20. Three monomer preparation system; 21. Three monomer slurry preparation tank; 22. Three monomer solution filter; 23. Three monomer reaction tank; 24. Three monomer reaction tank heat medium heating pump; 25. Three monomer slurry transfer pump; 26. Three... 27. Intermediate cooling adjustment tank for monomers; 28. Finished product filter for three monomers; 29. ​​Finished product feed pump for three monomers; 30. Finished product tank for three monomers; 31. Heat medium system; 32. Heat medium circulation pump; 33. Heat medium inlet pipe; 34. Heat medium return pipe; 45. Exhaust pipe; 46. Melt filtration system; 47. Dual polyester filter; 48. Melt transfer pump; 59. EG injection system; 50. First static mixer; 51. EG injection valve; 52. Flow regulating valve; 53. EG delivery pipeline; 64. Online injection system for three monomers; 65. EG flow meter for three monomers; 66. EG flow control valve for three monomers; 67. EG injection valve for three monomers. Detailed Implementation

[0017] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0018] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0019] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] like Figure 1As shown, a five-reactor process for online addition of three monomer cations includes a first esterification reactor 3, a second esterification reactor 4, a first pre-shrinking reactor 5, a second pre-shrinking reactor 7, a final polycondensation reactor 8, a process tower 6, a first esterification transfer pump 10, a pre-shrinking filter 9, and a melt filtration system 40. The first esterification reactor 3, the second esterification reactor 4, the first pre-shrinking reactor 5, the second pre-shrinking reactor 7, and the final polycondensation reactor 8 are connected in series via pipelines. The process tower 6 is connected to the first esterification reactor 3 and the second esterification reactor 4. The melt in the second pre-shrinking reactor 7 is injected into the pre-shrinking filter 9 through the first esterification transfer pump 10 for filtration before being injected into the final polycondensation reactor 8. Finally, it is filtered by the melt filtration system and then... The material is transported through pipelines to spinning booster pumps, and then distributed to various dosage pumps for the spinneret assembly to produce yarn. A batching pipeline 14 is provided between the first esterification reactor 3 and the second esterification reactor 4. The system also includes a three-monomer preparation system 20 and a three-monomer online injection system 60. The three-monomer online injection system 60 is located on the batching pipeline 14. A dynamic mixer 12 and a pneumatic valve 11 are provided on the batching pipeline 14 between the three-monomer online injection system 60 and the second esterification reactor 4. The material prepared by the three-monomer preparation system 20 is injected into the connecting pipeline through the three-monomer online injection system 60, and then enters the dynamic mixer 12 for mixing. The output flow rate is controlled by controlling the pneumatic valve 11.

[0021] Based on the melt conveying system of the five-reactor process unit of China Textile Academy, a three-monomer online injection system 60 is connected to a three-monomer preparation system 20 on the batching pipeline 14 between the first esterification reactor 3 and the second esterification reactor 4. This allows the three monomers to be mixed with the esterified product in the batching pipeline 14 before being injected into the second esterification reactor 4. This enables the current five-reactor process unit of China Textile Academy to produce not only ordinary semi-dull or full-dull products, but also cationic products. When producing cationic products, no equipment replacement is required, making it easier to promote and enabling the existing five-reactor process unit of China Textile Academy to achieve a rapid and low-cost transformation to produce cationic and semi-dull products, maximizing profits for enterprises. However, simply mixing the product in the batching pipeline 14 and then directly injecting it into the second esterification reactor 4 for stirring can easily lead to uneven reaction, resulting in excessively high agglomeration ratios, incomplete reaction, shortened melt filter lifespan, and excessive fluctuations in final melt viscosity, affecting product quality. Therefore, a dynamic mixer 12 was added to the pipe after mixing, so that the two melts can be fully mixed, making the melt reaction in the second esterification vessel 4 more uniform.

[0022] A further improvement is made to the three-unit online injection system 60, which includes a three-unit flow meter 61 and two three-unit injection valves 63 connected in series on the dispensing pipeline 14. The two three-unit injection valves 63 are connected to the three-unit preparation system 20 via the three-unit flow meter 61. A three-unit flow control valve 62 is also provided between the three-unit flow meter 61 and the three-unit injection valves 63. The three-unit flow control valve 62 and the three-unit flow meter 61 are linked for control. The opening degree of the three-unit flow control valve 62 is set by the maximum output of the three-unit flow meter 61. The three-unit flow control valve 62 is used to assist in controlling the output flow of the three-unit flow meter 61. During use, even if the three-unit flow meter 61 malfunctions, the three-unit flow can be controlled by the three-unit flow control valve 62 to prevent over- or under-injection of the three-units.

[0023] A further improvement is that the batching pipeline 14 is also equipped with an EG injection system 50. The EG injection system 50 includes an EG delivery pipeline 54, two EG injection valves 52 connected in series on the batching pipeline 14, and a flow regulating valve 53 on the EG delivery pipeline 54. The two EG injection valves 52 are connected to the EG delivery pipeline 54. The EG injection valves 52 are located at the front end of the three-unit injection valve 63. A first static mixer 51 is provided between the EG injection valves 52 and the three-unit injection valve 63.

[0024] Since the melt flowing out of the first esterification reactor 3 is around 255 degrees Celsius, and the reaction temperature of the three monomers is above 245 degrees Celsius, directly injecting the three monomers into the esterified product for mixing can easily cause accelerated agglomeration. Therefore, before injecting the esterified product into the three monomers, fresh EG is injected through the EG delivery line 54 to cool the esterified product, thus avoiding the problem of accelerated agglomeration after the three monomers are injected. In order to ensure that the EG reaches the required temperature after injection, and to avoid the esterified product temperature being too low or insufficiently cooled due to excessively rapid cooling, two EG injection valves 52 are used to inject into different areas, which can effectively solve this problem. Two three monomer injection valves 63 are used, which allows the melt to be injected in segments, thereby resulting in higher mixing uniformity and more precise injection volume. Meanwhile, after EG is injected into the EG injection valve 52, the esterified compound is in a flowing state, which can easily lead to uneven cooling of the esterified compound. This can cause the three monomers to react prematurely after contacting the uncooled esterified compound. Therefore, a first static mixer 51 is added between the EG injection valve 52 and the three monomer injection valve 63 to effectively avoid uneven cooling.

[0025] A further improvement is made in that a shell-and-tube heat exchanger 15 is provided between the EG injection system 50 and the three-monomer online injection system 60, the temperature of the melt after mixing with EG is 247-250℃, and the temperature of the melt after being cooled by the shell-and-tube heat exchanger 15 is 240±2℃.

[0026] Because adding too much EG can easily cause excessive reaction in the mixed melt, resulting in an excessively high esterification rate and affecting product quality, a shell-and-tube heat exchanger 15 is added between the EG injection system 50 and the three monomers online injection system 60. The temperature of the melt after EG addition is first reduced to about 247-250℃, and then cooled down to 240±2℃ by the shell-and-tube heat exchanger 15. This satisfies the injection conditions of the three monomers and avoids the occurrence of subsequent problems caused by excessive EG addition.

[0027] A further improvement is made by providing a second static mixer 13 between the three monomer injection valve 63 and the dynamic mixer 12.

[0028] Because the distance between the mixed melt and the second esterification vessel 4 is short, directly entering the dynamic mixer 12 for mixing will result in an uneven ratio of the two melts, leading to excessive agglomeration of one melt in certain areas and subsequent blockage. Therefore, before entering the dynamic mixer 12, the mixed melt is premixed in the second static mixer 13 to bring the ratio of the two melts closer together. This allows the two melts to be mixed in the second static mixer 13 before entering the dynamic mixer 12 for further mixing, effectively solving the problem of melt agglomeration in the later stages and avoiding pipeline blockage.

[0029] A further improvement is that a second esterification pump 2 and an esterification flow meter 1 are sequentially installed on the feed pipeline 14 between the first esterification reactor 3 and the three monomer online injection system 60. Two second esterification pumps 2 are used and connected in parallel.

[0030] Since the existing batching pipeline 14 lacks a delivery pump, the flow rate is unstable. After adding EG and the three monomers, insufficient flow rate and uneven batching are likely to occur. Therefore, in order to ensure the delivery volume of esters, a second ester delivery pump 2 and an ester flow meter 1 are added sequentially to the batching pipeline 14 between the first esterification reactor 3 and the three monomers online injection system 60. The combination of the second ester delivery pump 2 and the ester flow meter 1 can effectively control the amount of esters delivered and the mixing situation, thereby ensuring the stability of ester delivery. In particular, two second ester delivery pumps 2 are set up in parallel. When one needs maintenance, the other can be used to supply materials, thereby ensuring the continuity of ester delivery.

[0031] A further improvement is made to the three-monomer preparation system 20, which includes a three-monomer slurry preparation tank 21, a three-monomer slurry delivery pump 25, a three-monomer reaction tank 23, a three-monomer reaction tank 23 heat medium heating pump, a three-monomer solution filter 22, a three-monomer intermediate cooling adjustment tank 26, a three-monomer finished product filter 27, a three-monomer finished product tank 29, and a three-monomer finished product feeding pump 28.

[0032] The three monomer melt is configured through the three monomer preparation system 20. After the configuration is completed, the melt is fed to the three monomer flow meter 61 by the three monomer finished product feed pump 28 and then mixed with the esterified melt. The structure is simpler and the precision of the injected three monomer melt after preparation is higher.

[0033] A further improvement is that the melt filtration system 40 includes two melt transfer pumps 42 connected to the discharge pipe of the final polycondensation reactor 8 via a three-way pipe, and a dual polyester filter 41 disposed at the discharge end of the melt transfer pumps 42.

[0034] Currently, the discharge pipe of the final polycondensation reactor 8 only has two melt transfer pumps 42 and one set of dual polyester filters 41. Multiple spinning production lines are simultaneously connected to the outlet of the dual polyester filters 41. During the conveying process, there is a problem with the short cycle of the dual polyester filters 41, which easily leads to insufficient replacement time when switching filters, causing the backup online filter to become clogged and resulting in passive shutdown. Therefore, an additional set of dual polyester filters 41 connected to one of the melt transfer pumps 42 has been added to one side of the original dual polyester filters 41. This creates two sets of parallel melt transfer pumps 42 and dual polyester filters 41 in the discharge pipe of the final polycondensation reactor 8. The melt in the final polycondensation reactor 8 can be supplied to different spinning booster pumps through the two sets of parallel melt transfer pumps 42 and dual polyester filters 41. This avoids the problem of not being able to replace one of the filters in time due to the short interval when one of the dual polyester filters 41 is being maintained, due to the large flow rate. This also prevents passive shutdowns caused by filter maintenance.

[0035] A further improvement includes a heat transfer system 30, and all added material conveying pipelines are jacketed pipes, which are connected to the heat transfer system 30.

[0036] The heat transfer system 30 can heat and insulate all the added conveying pipelines, preventing the flowing melt temperature from becoming too low. The heat transfer system 30 consists of a heat transfer inlet pipe 32, a heat transfer return pipe 33, two heat transfer circulation pumps 31, and an exhaust pipe 34. The heat transfer medium enters the jacketed pipe through the heat transfer inlet pipe 32 and finally flows back through the heat transfer return pipe 33. The steam generated in the jacketed pipe is discharged to the outside through the exhaust pipe 34, preventing the pipeline from being damaged due to excessive internal pressure and also preventing the occurrence of large local vacuums inside.

[0037] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A five-reactor process for online addition of three monomer cations, comprising a first esterification reactor (3), a second esterification reactor (4), a first pre-shrinking reactor (5), a second pre-shrinking reactor (7), a final polycondensation reactor (8), a process tower (6), a first esterification transfer pump (10), a pre-shrinking filter (9), and a melt filtration system (40), wherein the first esterification reactor (3), the second esterification reactor (4), the first pre-shrinking reactor (5), the second pre-shrinking reactor (7), and the final polycondensation reactor (8) are connected in series via pipelines, the process tower (6) is connected to the first esterification reactor (3) and the second esterification reactor (4), the melt in the second pre-shrinking reactor (7) is injected into the pre-shrinking filter (9) by the first esterification transfer pump (10) for filtration and then injected into the final polycondensation reactor (8), and finally filtered by the melt filtration system and transported through pipelines to the spinning booster pump, and then distributed to each dosing pump for the spinneret to produce yarn, characterized in that: A dispensing pipeline (14) is provided between the first esterification vessel (3) and the second esterification vessel (4). It also includes a three-monomer preparation system (20) and a three-monomer online injection system (60). The three-monomer online injection system (60) is located on the dispensing pipeline (14). A dynamic mixer (12) and a pneumatic valve (11) are provided on the dispensing pipeline (14) between the three-monomer online injection system (60) and the second esterification vessel (4). The material prepared by the three-monomer preparation system (20) is injected into the connecting pipeline through the three-monomer online injection system (60), and then enters the dynamic mixer (12) for mixing. The output flow rate is controlled by controlling the pneumatic valve (11). The batching pipeline (14) is also equipped with an EG injection system (50). The EG injection system (50) includes an EG delivery pipeline (54), two EG injection valves (52) connected in series on the batching pipeline (14), and a flow regulating valve (53) on the EG delivery pipeline (54). The two EG injection valves (52) are connected to the EG delivery pipeline (54). The EG injection valves (52) are located at the front end of the three-monomer online injection system (60). A first static mixer (51) is provided between the EG injection valves (52) and the three-monomer online injection system (60). The three-unit online injection system (60) includes a three-unit flow meter (61) and two three-unit injection valves (63) connected in series on the dispensing pipeline (14). The two three-unit injection valves (63) are connected to the three-unit preparation system (20) through the three-unit flow meter (61).

2. The device for online addition of three monomeric cations in a five-reactor process according to claim 1, characterized in that: A second static mixer (13) is provided between the three monomer injection valve (63) and the dynamic mixer (12).

3. The device for online addition of three monomeric cations in a five-reactor process according to claim 1, characterized in that: A second esterification pump (2) and an esterification flow meter (1) are sequentially installed on the feed pipeline (14) between the first esterification reactor (3) and the three monomer online injection system (60). Two second esterification pumps (2) are arranged in parallel.

4. The device for online addition of three monomeric cations in a five-reactor process according to claim 2, characterized in that: The three monomer preparation system (20) includes a three monomer slurry preparation tank (21), a three monomer slurry delivery pump (25), a three monomer reaction tank (23), a three monomer reaction tank (23) heat medium heating pump, a three monomer solution filter (22), a three monomer intermediate cooling adjustment tank (26), a three monomer finished product filter (27), a three monomer finished product tank (29), and a three monomer finished product feeding pump (28).

5. A five-reactor process online addition device for three monomer cations according to any one of claims 1 to 4, characterized in that: The melt filtration system (40) includes two melt delivery pumps (42) connected to the discharge pipe of the final polycondensation reactor (8) via a three-way pipe, and a dual polyester filter (41) located at the discharge end of the melt delivery pumps (42).

6. The device for online addition of three monomeric cations in a five-reactor process according to claim 1, characterized in that: It also includes a heat medium system (30), and all the added material conveying pipelines are jacketed pipes, which are connected to the heat medium system (30).

Images