Five-kettle process on-line tri-monomer cation adding device

Abstract

The invention discloses a five-kettle flow on-line tri-monomer cation adding device which comprises a first esterification kettle, a second esterification kettle, a first preshrinking kettle, a second preshrinking kettle, a final polycondensation kettle, a process tower, a first ester delivery pump, a preshrinking filter and a solution filtering system. The system further comprises a three-monomer preparation system and a three-monomer on-line injection system, the three-monomer on-line injection system is arranged on the batching pipeline, and a dynamic mixer and a pneumatic valve are arranged on the batching pipeline between the three-monomer on-line injection system and the second esterification kettle. Materials prepared by the three-monomer preparation system are injected into the connecting pipeline through the three-monomer online injection system and then enter the dynamic mixer to be mixed, and then the output flow is controlled by controlling the pneumatic valve. The transformation from production of extinction products to production of cationic products can be quickly realized in the five-kettle process, so that the productivity and the quality of the products are ensured, and benefits are created for enterprises to be maximized.

Description

Technical Field

[0001] The present invention relates to the technical field of cation production, and particularly relates to a five-kettle process online addition three-monomer cation device. Background Art

[0002] During the spinning production process, when producing cation products, currently, it generally needs to go through a three-kettle process or a two-esterification horizontal reaction kettle process for production. In existing spinning enterprises, many still use the original five-kettle process device of the China National Textile and Apparel Council. However, due to the lack of an online cation addition device in the existing five-kettle process device of the China National Textile and Apparel Council, it can only produce ordinary semi-dull or full-dull products, etc., and cannot produce cation products. For enterprises, replacing the entire existing five-kettle process device with a three-kettle process device is too costly and not easy to promote, and the transformation difficulty between cation and semi-dull products is high. Therefore, it is necessary to transform the existing original five-kettle process device of the China National Textile and Apparel Council to enable the existing five-kettle process device of the China National Textile and Apparel Council to achieve a fast and low-cost transformation between producing cation and semi-dull products, and create the maximum benefit for the enterprise. Summary of the Invention

[0003] In order to solve certain or some technical problems existing in the prior art, the purpose of this application is to provide a five-kettle process online addition three-monomer cation device, which can enable the five-kettle process to quickly transform from producing dull products to producing cation products, ensure the production capacity and quality of the products, and create the maximum benefit for the enterprise.

[0004] To solve the above existing technical problems, the present application is implemented by adopting the following technical solutions:

[0005] A five-kettle process online addition of three monomer cation device, including a first esterification kettle, a second esterification kettle, a first pre-condensation kettle, a second pre-condensation kettle, a final condensation kettle, a process tower, a first esterified product transfer pump, a pre-condensation filter, and a melt filtration system. The first esterification kettle, the second esterification kettle, the first pre-condensation kettle, the second pre-condensation kettle, and the final condensation kettle are connected in series through pipelines in sequence. The process tower is connected to the first esterification kettle and the second esterification kettle. The melt in the second pre-condensation kettle is injected into the pre-condensation filter through the first esterified product transfer pump for filtration and then injected into the final condensation kettle. Finally, it is filtered through the melt filtration system and transported to the spinning booster pump through a pipeline, and then distributed to each metering pump for the spinneret assembly to extrude filaments. There is a batching pipeline between the first esterification kettle and the second esterification kettle. It also includes a three-monomer preparation system and a three-monomer online injection system. The three-monomer online injection system is arranged on the batching pipeline. There is a dynamic mixer and a pneumatic valve on the batching pipeline between the three-monomer online injection system and the second esterification kettle. 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 is controlled by controlling the pneumatic valve.

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

[0007] Preferably, an EG injection system is also arranged on the batching pipeline. The EG injection system includes an EG transfer pipeline, two EG injection valves arranged in series on the batching pipeline, a flow regulating valve arranged on the EG transfer pipeline. The two EG injection valves are connected to the EG transfer pipeline. The EG injection valve is arranged at the front end of the three-monomer injection valve. There is a first static mixer between the EG injection valve and the three-monomer injection valve.

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

[0009] Preferably, a second esterified product transfer pump and an esterified product flowmeter are arranged in sequence on the batching pipeline between the first esterification kettle and the three-monomer online injection system. Two second esterified product transfer pumps are arranged in parallel.

[0010] Preferably, the three-monomer preparation system includes a three-monomer slurry preparation tank, a three-monomer slurry transfer 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 and 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 end condensation kettle through a three-way pipe, and a double polyester filter provided at the discharge end of the melt transfer pump.

[0012] Preferably, it further includes a heat medium system. All the added material conveying pipelines adopt jacketed pipes, and the jacketed pipes are connected to the heat medium system.

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

[0014] On the batching pipeline between the first esterification kettle and the second esterification kettle, it is connected to the tri-monomer preparation system through the tri-monomer on-line injection system, so that the tri-monomer can be mixed with the esterified product in the batching pipeline and then injected into the second esterification kettle. At present, the five-kettle process device of the China National Textile and Apparel Council can not only produce ordinary semi-dull or full-dull products, but also produce cationic products. When producing cationic products, there is no need to replace equipment, which is easier to promote, enabling the existing five-kettle process device of the China National Textile and Apparel Council to achieve a rapid and low-cost transformation of producing cationic and semi-dull products, creating the maximum benefit for the enterprise. However, simply mixing directly in the batching pipeline and then directly injecting it into the second esterification kettle for stirring easily leads to uneven reaction, resulting in too high an agglomeration ratio, incomplete reaction, and excessive fluctuation of the end condensation melt viscosity, affecting product quality. Therefore, a dynamic mixer is added to the pipeline after mixing, so that the two melts can be fully mixed, making the melt reaction in the second esterification kettle more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] In the figure: 1. Esterified product flowmeter; 2. Second esterified product transfer pump; 3. First esterification kettle; 4. Second esterification kettle; 5. First pre-condensation kettle; 6. Process tower; 7. Second pre-condensation kettle; 8. Final polycondensation kettle; 9. Pre-condensation filter; 10. First esterified product transfer pump; 11. Pneumatic valve; 12. Dynamic mixer; 13. Second static mixer; 14. Batching pipeline; 15. Shell-and-tube heat exchanger; 20. Tertiary monomer preparation system; 21. Tertiary monomer slurry preparation tank; 22. Tertiary monomer solution filter; 23. Tertiary monomer reaction tank; 24. Heat medium heating pump for tertiary monomer reaction tank; 25. Tertiary monomer slurry transfer pump; 26. Tertiary monomer intermediate cooling and adjustment tank; 27. Tertiary monomer finished product filter; 28. Tertiary monomer finished product feeding pump; 29. Tertiary monomer finished product tank; 30. Heat medium system; 31. Heat medium circulation pump; 32. Heat medium feed pipe; 33. Heat medium return pipe; 34. Exhaust pipe; 40. Melt filtration system; 41. Double polyester filter; 42. Melt transfer pump; 50. EG injection system; 51. First static mixer; 52. EG injection valve; 53. Flow regulating valve; 54. EG transfer pipeline; 60. Tertiary monomer on-line injection system; 61. Tertiary monomer flowmeter; 62. Tertiary monomer flow control valve; 63. Tertiary monomer injection valve. Detailed implementation manners

[0017] Next, in combination with the accompanying drawings and specific implementation manners, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined with each other to form new embodiments.

[0018] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0019] The terms "first", "second", etc. in the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0020] As Figure 1As shown in the figure, a five-reactor process online addition of cationic device for three monomers includes a first esterification kettle 3, a second esterification kettle 4, a first pre-condensation kettle 5, a second pre-condensation kettle 7, a final polycondensation kettle 8, a process tower 6, a first esterified product transfer pump 10, a pre-condensation filter 9, and a melt filtration system 40. The first esterification kettle 3, the second esterification kettle 4, the first pre-condensation kettle 5, the second pre-condensation kettle 7, and the final polycondensation kettle 8 are connected in series through pipelines in sequence. The process tower 6 is connected to the first esterification kettle 3 and the second esterification kettle 4. The melt in the second pre-condensation kettle 7 is injected into the pre-condensation filter 9 through the first esterified product transfer pump 10 for filtration and then injected into the final polycondensation kettle 8. Finally, it is filtered through the melt filtration system and then transported through a pipeline to a spinning booster pump, and then distributed to each metering pump for the spinneret assembly to extrude filaments. A batching pipeline 14 is provided between the first esterification kettle 3 and the second esterification kettle 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 arranged 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 kettle 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 is controlled by controlling the pneumatic valve 11.

[0021] Based on the melt transfer system of the five-reactor process device of China National Textile and Apparel Council, it is connected to the three-monomer preparation system 20 through the three-monomer online injection system 60 on the batching pipeline 14 between the first esterification kettle 3 and the second esterification kettle 4. Thus, the three monomers can be mixed with the esterified product in the batching pipeline 14 and then injected into the second esterification kettle 4. This enables the current five-reactor process device of China National Textile and Apparel Council to not only produce ordinary semi-dull or full-dull products, but also produce cationic products. When producing cationic products, there is no need to replace equipment, which is easier to promote, enabling the existing five-reactor process device of China National Textile and Apparel Council to achieve a rapid and low-cost transformation for producing cationic and semi-dull products, creating maximum benefits for the enterprise. However, simply mixing directly in the batching pipeline 14 and then directly injecting it into the second esterification kettle 4 for stirring easily leads to uneven reaction, resulting in too high an agglomeration ratio and incomplete reaction, causing excessive fluctuations in the service life of the subsequent melt filter and the viscosity of the final polycondensate melt, affecting product quality. Therefore, a dynamic mixer 12 is added to the pipeline after mixing, so that the two melts can be fully mixed, making the reaction of the melt in the second esterification kettle 4 more uniform.

[0022] Further improvement is that the three-monomer online injection system 60 includes a three-monomer flow meter 61 and two three-monomer injection valves 63 arranged in series on the batching pipeline 14. The two three-monomer injection valves 63 are connected to the three-monomer preparation system 20 through the three-monomer flow meter 61. A three-monomer flow control valve 62 is also arranged between the three-monomer flow meter 61 and the three-monomer injection valve 63. The three-monomer flow control valve 62 and the three-monomer flow meter 61 are controlled in linkage. The opening degree of the three-monomer flow control valve 62 is set by the maximum output of the three-monomer flow meter 61. The three-monomer flow control valve 62 is used to assist in controlling the output flow of the three-monomer flow meter 61. During use, even if there is a problem with the three-monomer flow meter 61, the three-monomer flow control valve 62 can be used to control the three-monomer flow to avoid excessive or insufficient injection of the three monomers.

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

[0024] Since the melt flowing out of the first esterification reactor 3 is about 255 degrees, and the reaction temperature of the three monomers is above 245 degrees, directly injecting the three monomers to mix with the esterification product is likely to cause accelerated agglomeration. Therefore, before the esterification product is injected into the three monomers, fresh EG is first injected through the EG delivery pipeline 54 to cool the esterification product, thereby avoiding the problem of accelerated agglomeration after the three monomers are injected. Among them, in order to ensure that the EG reaches the required temperature after injection, and to avoid the esterification product temperature being too low due to too fast cooling, or inadequate cooling, injection in different areas through two EG injection valves 52 can effectively solve this problem, and the use of two three-monomer injection valves 63 can enable the melt to be injected in sections, so that the mixing uniformity is higher and the injection amount is more accurate. At the same time, after the EG injection valve 52 injects EG, the ester is in a flowing state, which easily leads to uneven cooling of the ester, causing the three monomers to react prematurely after contacting with the uncooled ester. Therefore, a first static mixer 51 is added between the EG injection valve 52 and the three-monomer injection valve 63, which can effectively avoid the occurrence of uneven cooling.

[0025] Further improvement is that a shell-and-tube heat exchanger 15 is provided between the EG injection system 50 and the three-monomer on-line injection system 60. The temperature of the melt after mixing with EG is 247-250 °C, and the temperature of the melt after cooling by the shell-and-tube heat exchanger 15 is 240±2 °C.

[0026] Because adding too much EG is likely to cause excessive reaction of the mixed melt, resulting in too high an esterification rate and affecting product quality. Therefore, a shell-and-tube heat exchanger 15 is added between the EG injection system 50 and the three-monomer on-line injection system 60. The temperature of the melt after adding EG is first reduced to about 247-250 °C, and then cooled by the shell-and-tube heat exchanger 15 to a melt temperature of 240±2 °C, so as to not only meet the injection conditions of the three monomers, but also avoid problems caused by excessive addition of EG.

[0027] Further improvement is that a second static mixer 13 is provided between the three-monomer injection valve 63 and the dynamic mixer 12.

[0028] Since the distance from the mixed melt to the second esterification kettle 4 is short, if it directly enters the dynamic mixer 12 for mixing, there will be a problem of uneven proportion of the two melts, resulting in local excessive agglomeration of a certain melt and subsequent clogging problems. Therefore, before entering the dynamic mixer 12, the mixed melt is first pre-mixed in the second static mixer 13 to make the proportion of the two melts close. Thus, after the two melts are mixed in the second static mixer 13 and then enter the dynamic mixer 12 for mixing, the problem of later melt agglomeration can be effectively solved and the pipeline blockage is avoided.

[0029] Still further improvement is that a second esterified product transfer pump 2 and an esterified product flowmeter 1 are successively provided on the batching pipeline 14 between the first esterification kettle 3 and the three-monomer on-line injection system 60, and two second esterified product transfer pumps 2 are arranged in parallel.

[0030] Since there is no transfer pump on the existing batching pipeline 14, the flow rate is unstable, and it is easy to cause problems such as insufficient flow rate and uneven batching after adding EG and the three monomers. Therefore, in order to ensure the delivery volume of the esterified product, a second esterified product transfer pump 2 and an esterified product flowmeter 1 are successively added on the batching pipeline 14 between the first esterification kettle 3 and the three-monomer on-line injection system 60. The combination of the second esterified product transfer pump 2 and the esterified product flowmeter 1 can effectively and precisely control the delivered amount of the esterified product and the mixing situation, thus ensuring the delivery stability of the esterified product. In particular, two second esterified product transfer pumps 2 are arranged in parallel. When one of them needs maintenance, the other can be used for feeding, thus ensuring the continuity of the esterified product delivery.

[0031] Further improvement is that the three-monomer preparation system 20 includes a three-monomer slurry preparation tank 21, a three-monomer slurry transfer pump 25, a three-monomer reaction tank 23, a heat medium heating pump for the three-monomer reaction tank 23, a three-monomer solution filter 22, a three-monomer intermediate cooling and 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 configuration, the melt is metered by the three-monomer finished product feeding pump 28 to the three-monomer flowmeter 61 and then mixed with the esterified product melt. The structure is simpler, and the accuracy of the injected three-monomer melt after blending is higher.

[0033] Further improvement is that the melt filtration system 40 includes two melt transfer pumps 42 connected to the discharge pipe of the final polycondensation kettle 8 through a tee pipe, and a double polyester filter 41 provided at the discharge end of the melt transfer pump 42.

[0034] Currently, there are only two melt transfer pumps 42 and a set of double polyester filters 41 in the discharge pipe of the final polycondensation kettle 8. Multiple spinning production lines are connected to the outlet of the double polyester filter 41 at the same time. During the transportation process, there is a problem of short cycle of the double polyester filter 41, which easily leads to insufficient disassembly time when switching filters, and the standby on-line filter may also be blocked, resulting in passive shutdown. Therefore, a set of double polyester filters 41 connected to one of the melt transfer pumps 42 is added on one side of the original double polyester filter 41, so that the discharge pipe of the final polycondensation kettle 8 forms two sets of melt transfer pumps 42 and double polyester filters 41 arranged in parallel. The melt in the final polycondensation kettle 8 can be fed to different spinning booster pumps through the two sets of melt transfer pumps 42 and double polyester filters 41 arranged in parallel, thus avoiding the problem that when one of the single double polyester filters 41 is maintained, due to the large flow rate, the medium term is short and one of the filters cannot be replaced in time, and no longer causing passive shutdown due to the maintenance of the filter.

[0035] Further improvement is that a heat medium system 30 is also included. All the added material conveying pipelines adopt jacketed pipes, and the jacketed pipes are connected to the heat medium system 30.

[0036] The heat medium system 30 can heat and insulate all the added conveying pipelines to avoid the situation that the flowing melt has too low a temperature. Among them, the heat medium system 30 consists of a heat medium feed pipe 32, a heat medium return pipe 33, two heat medium circulation pumps 31, and an exhaust pipe 34. The heat medium enters the jacketed pipe through the heat medium feed pipe 32 and finally returns through the heat medium return pipe 33. The steam generated in the jacketed pipe is discharged outward through the exhaust pipe 34, avoiding the pipeline from being damaged due to excessive internal pressure and also avoiding the occurrence of a large amount of local vacuum inside.

[0037] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-substantive changes and substitutions made by those skilled in the art based on the present application fall within the scope of protection required by the present application.

Claims

1. A five-reactor process online three-monomer cation addition device, 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 product delivery 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 sequentially connected in series through a pipeline, the process tower (6) is connected with 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 product delivery pump (10) for filtration and then injected into the final polycondensation reactor (8), finally filtered by the melt filtration system and then transported to a spinning booster pump through a pipeline, and then distributed to each dosage pump for spinning assembly to produce silk, characterized in that: A dosing pipeline (14) is provided between the first esterification kettle (3) and the second esterification kettle (4), and further comprises a three-monomer preparation system (20) and a three-monomer online injection system (60). The three-monomer online injection system (60) is provided on the dosing pipeline (14). A dynamic mixer (12) and a pneumatic valve (11) are provided on the dosing pipeline (14) between the three-monomer online injection system (60) and the second esterification kettle (4). The materials prepared by the three-monomer preparation system (20) are injected into the connecting pipeline through the three-monomer online injection system (60), and then enter the dynamic mixer (12) for mixing, and then the output flow is controlled by controlling the pneumatic valve (11).

2. The five-reactor process online three-monomer cation addition device according to claim 1, characterized in that: The batching pipeline (14) is also provided with an EG injection system (50), the EG injection system (50) comprising an EG delivery pipeline (54), two EG injection valves (52) arranged in series on the batching pipeline (14), and a flow regulating valve (53) arranged on the EG delivery pipeline (54), the two EG injection valves (52) being connected to the EG delivery pipeline (54), the EG injection valves (52) being arranged at the front end of the three-monomer online injection system (60), and a first static mixer (51) being arranged between the EG injection valves (52) and the three-monomer online injection system (60).

3. A five-reactor process online three-monomer cation addition device according to claim 2, characterized in that: The three-monomer online injection system (60) comprises a three-monomer flow meter (61) and two three-monomer injection valves (63) arranged in series on the batching pipeline (14); the two three-monomer injection valves (63) are connected to the three-monomer preparation system (20) via the three-monomer flow meter (61).

4. A five-reactor process online three-monomer cation addition device according to claim 3, characterized in that: A second static mixer (13) is provided between the three-monomer injection valve (63) and the dynamic mixer (12).

5. The five-reactor process online three-monomer cation addition device according to claim 1, characterized in that: The dosing pipeline (14) between the first esterification kettle (3) and the three-monomer online injection system (60) is provided with a second esterification product delivery pump (2) and an esterification product flow meter (1) in sequence, and two second esterification product delivery pumps (2) are arranged in parallel.

6. The five-reactor process online three-monomer cation addition device according to claim 4, characterized in that: The three-monomer preparation system (20) comprises three-monomer slurry preparation tanks (21), three-monomer slurry delivery pumps (25), three-monomer reaction tanks (23), three-monomer reaction tank (23) heat medium heating pumps, three-monomer solution filters (22), three-monomer intermediate cooling adjustment tanks (26), three-monomer finished product filters (27), three-monomer finished product tanks (29) and three-monomer finished product feeding pumps (28).

7. A five-reactor process online three-monomer cation addition device according to any one of claims 1 to 6, characterized in that: The melt filtration system (40) comprises two melt delivery pumps (42) connected to the discharge pipe of the final polycondensation reactor (8) through a three-way pipe, and a double polyester filter (41) arranged at the discharge end of the melt delivery pump (42).

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

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