Integrated carbon fiber demonomerisation and defoaming device

Abstract

The utility model provides an integrated carbon fiber demonomerisation and defoaming device which is characterized in that a reboiler is arranged on one side of a demonomerisation and defoaming tower, the reboiler is used for conveying an absorbent into the demonomerisation and defoaming tower, a distribution disc, a packing layer, a redistributor and a defoaming device are sequentially arranged in the demonomerisation and defoaming tower from top to bottom, a feeding pipe is arranged above the demonomerisation and defoaming tower, and a discharging pipe is arranged below the demonomerisation and defoaming tower. A discharging pipe is arranged below the demonomerisation and deaeration tower, a stock solution to be treated enters the demonomerisation and deaeration tower through a feeding pipe, sequentially passes through a distribution disc, a packing layer, a redistributor and a deaerator, then is collected at the bottom of the demonomerisation and deaeration tower and is discharged through the discharging pipe, a distribution pipe is arranged on the demonomerisation and deaeration tower, and the demonomerisation and deaeration tower is communicated with the demonomerisation and deaeration tower. The discharging end of the distribution pipe is positioned between the filler layer and the redistributor, and the feeding end of the distribution pipe is connected to the reboiler. The integrated carbon fiber demonomerisation and defoaming device disclosed by the utility model realizes efficient integration of demonomerisation and defoaming devices, and has the advantages of practicability, simplicity, low energy consumption, short operation time and small occupied space.

Description

Technical Field

[0001] The utility model belongs to the field of carbon fiber production, and particularly relates to an integrated carbon fiber monomer and bubble removal device. Background Technique

[0002] Carbon fiber has the advantages of high strength and low density, and is widely used in the fields of aviation, automobiles, sports equipment, etc. It is a strategic emerging material that China focuses on developing. Carbon fiber precursor defects are considered the "natural enemies" of carbon fiber. The quality of the precursor has a great impact on the post-treatment process of carbon fiber and the final mechanical properties of carbon fiber. Eliminating the structural defects of the precursor is expected to make the mechanical properties of carbon fiber approach its theoretical value. The precursor preparation process plays a crucial role in the quality of the precursor.

[0003] Generally, precursors with good molecular chain orientation, high density, and low solvent residue are more likely to obtain high-strength carbon fiber. According to the continuity of the connection between polymerization and spinning, the precursor preparation process can be divided into one-step method and two-step method. In both methods, due to incomplete reaction, monomers remain, and further polymerization will occur during the caching process, resulting in an increase in the viscosity of the stock solution. Moreover, during the stirring and dissolving processes, bubbles and a small amount of mechanical impurities will be generated. These factors will reduce the spinnability of the stock solution, easily cause wire breakage and deformation, and the spun precursor has surface cracks and internal micropores.

[0004] Therefore, before spinning, it is necessary to remove monomers and bubbles from the stock solution. The traditional process uses two sets of devices for monomer removal and bubble removal, which have the disadvantages of large fixed investment, long operation time, and large floor space. Summary of the Invention

[0005] In view of this, the purpose of the present utility model is to propose an integrated carbon fiber monomer and bubble removal device to solve the problems of large fixed investment, long operation time, and large floor space in the existing technology where monomer removal and bubble removal are two sets of devices.

[0006] To achieve the above purpose, the technical solution of the present utility model is realized as follows:

[0007] An integrated carbon fiber monomer and bubble removal device includes a monomer and bubble removal tower. A reboiler is arranged on one side of the monomer and bubble removal tower, and the reboiler is used to convey an absorbent into the monomer and bubble removal tower. Inside the monomer and bubble removal tower, a distribution plate, a packing layer, a redistributor, and a bubble remover are arranged in sequence from top to bottom. An inlet pipe is arranged above the monomer and bubble removal tower, and an outlet pipe is arranged below the monomer and bubble removal tower. The stock solution to be treated enters the inside of the monomer and bubble removal tower through the inlet pipe, and after passing through the distribution plate, the packing layer, the redistributor, and the bubble remover in sequence, it is collected at the bottom of the monomer and bubble removal tower and discharged through the outlet pipe. A distribution pipe is arranged on the monomer and bubble removal tower, and the discharge end of the distribution pipe is located between the packing layer and the redistributor. The feed end of the distribution pipe is connected to the reboiler.

[0008] Further, a vacuum extraction pipe is provided on the degassing and de-foaming tower, and an external vacuum extraction device is connected to the inside of the degassing and de-foaming tower through the vacuum extraction pipe.

[0009] Further, a plurality of distribution pipes are arranged in the degassing and de-foaming tower. The plurality of distribution pipes are arranged in parallel with each other, and the feed pipe is respectively connected to each distribution pipe. The discharge end of each distribution pipe is located above the distribution tray.

[0010] Further, the periphery of the distribution tray is fixedly connected to the inner ring of the degassing and de-foaming tower, and the first liquid passing holes are evenly distributed on the distribution tray;

[0011] Further, the periphery of the redistributor is fixedly connected to the inner ring of the degassing and de-foaming tower, and the second liquid passing holes are evenly distributed on the redistributor;

[0012] Further, both the first liquid passing holes and the second liquid passing holes are used for circulating the original liquid to be processed.

[0013] Further, the packing layer includes a packing support, and the packing support is fixedly installed in the degassing and de-foaming tower. The packing support is a frame structure, a packing body is arranged inside the packing support, and the packing body is a Pall ring.

[0014] Further, the de-foamer is an umbrella-shaped de-foamer, and a plurality of small holes are provided on the umbrella surface of the umbrella-shaped de-foamer.

[0015] Further, the bottom of the degassing and de-foaming tower is a conical structure, and an observation window sight glass is installed on the tower body of the degassing and de-foaming tower.

[0016] Further, a steam flow channel is provided on the side wall of the casing of the reboiler. The inlet end of the steam flow channel is connected to the steam pipeline, and the outlet end of the steam flow channel is connected to the first condensate pipeline.

[0017] Further, an upper liquid pocket is arranged at the upper end of the reboiler, a lower liquid pocket is arranged at the lower end of the reboiler. The upper liquid pocket is connected to the feed end of the distribution pipe, a second condensate pipeline is installed at the lower end of the lower liquid pocket, and a packing pipe is arranged on the reboiler.

[0018] Further, the absorbent is dimethyl sulfoxide, and a demister is arranged in the upper liquid pocket.

[0019] Compared with the prior art, the integrated carbon fiber degassing and de-foaming device of the present invention has the following beneficial effects: a distribution tray, a packing layer, a redistributor and a de-foamer are arranged in the degassing and de-foaming tower, and a reboiler is arranged outside the degassing and de-foaming tower to inject an absorbent into the degassing and de-foaming tower, realizing the efficient integration of the degassing and de-foaming device, and having the advantages of practical simplicity, low energy consumption, short operation time and small occupied space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0021] Figure 1 It is a schematic structural diagram of an integrated carbon fiber degassing and defoaming device according to an embodiment of the present utility model.

[0022] Explanation of reference numerals:

[0023] 1. Degassing and defoaming tower; 2. Distribution tray; 3. Packing layer; 4. Redistributor; 5. Defoamer; 6. Polymerization stock solution; 7. Upper liquid package; 8. Reboiler; 9. Lower liquid package; 10. Feed pipe; 11. Branch pipe; 12. Discharge pipe; 13. Steam pipeline; 14. First condensate pipeline; 15. Packing pipe; 16. Second condensate pipeline; 17. Distribution pipe; 18. Vacuum extraction pipe; 19. Observation window sight glass; 20. Demister. Detailed implementation manners

[0024] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 thus cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] As Figure 1 shown, an integrated carbon fiber degassing and de-bubbling device includes a degassing and de-bubbling tower 1. A reboiler 8 is provided on one side of the degassing and de-bubbling tower 1, and the reboiler 8 is a prior art. The reboiler 8 is used to convey an absorbent into the degassing and de-bubbling tower 1, and the absorbent in this embodiment is dimethyl sulfoxide. Inside the degassing and de-bubbling tower 1, a distribution tray 2, a packing layer 3, a redistributor 4, and a de-bubbler 5 are sequentially arranged from top to bottom. An inlet pipe 10 is provided above the degassing and de-bubbling tower 1, and an outlet pipe 12 is provided below the degassing and de-bubbling tower 1. The stock solution to be treated enters the inside of the degassing and de-bubbling tower 1 through the inlet pipe 10, and the stock solution to be treated sequentially passes through the distribution tray 2, the packing layer 3, the redistributor 4, and the de-bubbler 5 and then converges at the bottom of the degassing and de-bubbling tower 1 and is discharged through the outlet pipe 12. A distribution pipe 17 is provided on the degassing and de-bubbling tower 1, and the discharge end of the distribution pipe 17 is located between the packing layer 3 and the redistributor 4. The inlet end of the distribution pipe 17 is connected to the reboiler 8. By arranging the distribution tray 2, the packing layer 3, the redistributor 4, and the de-bubbler 5 inside the degassing and de-bubbling tower 1 and injecting the absorbent into the degassing and de-bubbling tower 1 by the reboiler 8 outside the degassing and de-bubbling tower 1, the efficient integration of the degassing and de-bubbling device is realized, which has the advantages of being practical and simple, low energy consumption, short operation time, and small floor space.

[0029] A vacuum extraction pipe 18 is provided on the degassing and de-bubbling tower 1, and an external vacuum extraction device is connected to the inside of the degassing and de-bubbling tower 1 through the vacuum extraction pipe 18. In this embodiment, the vacuum extraction pipe 18 is provided at the top of the degassing and de-bubbling tower 1. Degassing and de-bubbling need to be carried out under certain temperature and vacuum conditions. When the temperature of the gas is high, the solubility decreases. Especially under vacuum conditions, monomers and bubbles are more easily removed. At the bottom of the degassing and de-bubbling tower 1, an observation window sight glass 19 is installed on the tower body of the degassing and de-bubbling tower 1, which can observe the situation of caking and gelling.

[0030] The packing layer 3 includes a packing support, and the packing support is fixedly installed in the degassing and de-bubbling tower 1. The packing support is a frame structure, and a packing body is arranged inside the packing support. The packing body is a Pall ring. Above the packing layer 3, there is a stock solution to be treated feed distribution tray 2. Above the distribution tray 2, 20 to 30 distribution pipes 11 communicating with the inlet pipe 10 are evenly distributed, so that the stock solution to be treated is evenly distributed on the distribution tray 2 and then evenly flows into the packing layer 3. In this embodiment, the periphery of the distribution tray 2 is fixedly connected to the inner ring of the degassing and de-bubbling tower 1, and the first liquid passing holes are evenly distributed on the distribution tray 2; the periphery of the redistributor 4 is fixedly connected to the inner ring of the degassing and de-bubbling tower 1, and the second liquid passing holes are evenly distributed on the redistributor 4; the first liquid passing holes and the second liquid passing holes are both used for the stock solution to be treated to flow through. The diameters of the first liquid passing holes and the second liquid passing holes are both 0.03D, where D is the diameter of the degassing and de-bubbling tower 1, so that the stock solution to be treated flows down from the redistributor 4 in a filamentous state and flows into the umbrella-shaped de-bubbler 5, asFigure 1 As shown, a number of small holes are opened on each layer of the umbrella surface of the umbrella surface degassing device 5, with a pore diameter of 0.04D. The thickness of the thin layer on the umbrella surface can be controlled separately to make the thin layer on the umbrella surface evenly distributed, realizing efficient single removal and degassing, efficient gas-liquid distribution mass transfer, and accumulating the bottom polymerization liquid at the bottom of the single removal and degassing tower 1, and discharging it through the discharge pipe 12.

[0031] The bottom of the single removal and degassing tower 1 is a conical structure. In this embodiment, the angle of the conical structure is 60°, the lower short side is 0.5D, and the height is 0.44D. In the traditional degassing part, due to the long residence time, gel is generated. This structure can effectively avoid this phenomenon, reduce the residence time, and increase the degassing contact area.

[0032] At the bottom of the tube side of the reboiler 8, there is a packing tube 15 for dimethyl sulfoxide, and at the top, there is a gas-phase pipeline distribution pipe 17 entering the single removal and degassing tower 1. On the side wall of the shell of the reboiler 8, there is a steam flow channel. The inlet end of the steam flow channel is connected to the steam pipe 13, and the outlet end is connected to the first condensate pipeline 14. The dimethyl sulfoxide in the shell side is heated by the external injection of steam. The dimethyl sulfoxide flashes into gas and enters the single removal and degassing tower 1 through the gas-phase dimethyl sulfoxide distribution pipe 17, and the steam condensate is discharged through the first condensate pipeline 14.

[0033] The dimethyl sulfoxide steam entering the single removal and degassing tower 1 from the dimethyl sulfoxide distribution pipe 17 flows upward in the single removal and degassing tower 1 and contacts the raw liquid to be processed flowing downward in a countercurrent manner. The renewal of the liquid layer surface is conducive to mass transfer and heat transfer. The dimethyl sulfoxide infiltrates the packing body and its packing support, and tower internals such as the raw liquid feed distribution tray 2 and the redistributor 4, effectively preventing the generation of gel. Due to the space formed by the raw liquid feed distribution tray 2, the packing layer 3, the redistributor 4, and the umbrella surface degassing device 5 (the umbrella surface forms a microporous channel), the gas-liquid mass transfer area and the residence time are increased, further effectively improving the single removal and degassing efficiency, and being able to efficiently meet the requirements of single removal and degassing of high-viscosity polymerization liquid. Therefore, it is suitable for high-load continuous and efficient production.

[0034] In this embodiment, the middle part of the reboiler 8 is a tube bundle structure, the upper part is provided with an upper liquid pocket 7 of the reboiler 8, and above the upper liquid pocket 7, there is a demister 20, and the demister 20 is a prior art. The demister 20 separates the gas and liquid phases of the dimethyl sulfoxide, ensuring that the dimethyl sulfoxide entering the single removal and degassing tower 1 is in the gas phase. The lower part is provided with a lower liquid pocket 9 of the reboiler 8, and the dimethyl sulfoxide liquid condensate is discharged through the second condensate pipeline 16.

[0035] The working process of an integrated carbon fiber single removal and degassing device:

[0036] (1) Start the external vacuum system, and control the pressure in the kettle of the single removal and degassing tower 1 at 0.1 - 50 KPa(A) by the vacuum pipe 18

[0037] (2) Pump the undiluted solution to be processed into the feed pipe 10. The flow rate of the polymerization undiluted solution 6 is 0.1 - 5 m³ / h, and the concentration is 15% - 25%. The polymerization undiluted solution 6 is evenly distributed to the undiluted solution feed distribution tray 2 through 20 - 30 distribution pipes 11, and further flows to the packing layer 3 after further distribution.

[0038] (3) Pass dimethyl sulfoxide into the reboiler 8 through the dimethyl sulfoxide packing pipe 15 on the reboiler 8, with a flow rate of 0.01 - 0.5 m³ / h. Steam is introduced into the shell - side steam pipe 13 of the reboiler 8 to cause the dimethyl sulfoxide to flash - vaporize into gas under vacuum conditions. The gas enters the degassing and de - foaming tower 1 through the vapor - phase dimethyl sulfoxide distribution pipe 17.

[0039] (4) The dimethyl sulfoxide flows through the packing layer 3 and infiltrates to the distribution tray 2.

[0040] (5) The undiluted solution to be processed flows through the undiluted solution feed distribution pipe 17 and the packing layer 3 to obtain a large gas - liquid mass transfer area,

[0041] and makes counter - current contact with the upward - flowing dimethyl sulfoxide vapor, improving the surface renewal rate and being conducive to mass transfer and heat transfer.

[0042] (6) In the space above the redistributor 4 and above the umbrella - surface defoamer 5, the undiluted solution undergoes efficient degassing and mass transfer, and the concentration of the polymerization solution is 15% - 25%.

[0043] The following are the data of the polymerization undiluted solution 6 after being processed by an integrated carbon fiber degassing and de - foaming device under different conditions:

[0044] When the pressure in the degassing and de - foaming tower 1 is 0.1 KPa(A), the polymerization raw material in the degassing and de - foaming tower 1 is 2500 kg / h, the concentration is 18%, the amount of dimethyl sulfoxide added is 250 kg / h, and the concentration after degassing and de - foaming is 23%;

[0045] When the pressure in the degassing and de - foaming tower 1 is 5 KPa(A), the polymerization raw material in the degassing and de - foaming tower 1 is 2500 kg / h, the concentration is 18%, the amount of dimethyl sulfoxide added is 250 kg / h, and the concentration after degassing and de - foaming is 22%;

[0046] When the pressure in the degassing and de - foaming tower 1 is 10 KPa(A), the polymerization raw material in the degassing and de - foaming tower 1 is 2500 kg / h, the concentration is 18%, the amount of dimethyl sulfoxide added is 250 kg / h, and the concentration after degassing and de - foaming is 20%;

[0047] When the pressure in the degassing and de - foaming tower 1 is 50 KPa(A), the polymerization raw material in the degassing and de - foaming tower 1 is 2500 kg / h, the concentration is 18%, the amount of dimethyl sulfoxide added is 250 kg / h, and the concentration after degassing and de - foaming is 19%.

[0048] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An integrated carbon fiber debonding and degassing device, characterized in that: The invention comprises a degassing tower (1), a reboiler (8) is arranged on one side of the degassing tower (1), and the reboiler (8) is used to transport an absorbent into the degassing tower (1). A distribution plate (2), a packing layer (3), a redistributor (4) and a degassing device (5) are arranged in sequence from top to bottom inside the degassing tower (1). A feed pipe (10) is arranged above the degassing tower (1), and a discharge pipe (12) is arranged below the degassing tower (1). The raw liquid to be treated passes through the feed pipe (10) and is discharged from the degassing tower (1). 10) enters the interior of the degassing tower (1), and the raw liquid to be treated passes through the distribution plate (2), the packing layer (3), the redistributor (4) and the degassing device (5) in sequence, and is collected at the bottom of the degassing tower (1), and is discharged through the discharge pipe (12). The degassing tower (1) is provided with a distribution pipe (17), and the discharge end of the distribution pipe (17) is located between the packing layer (3) and the redistributor (4), and the feed end of the distribution pipe (17) is connected to the reboiler (8).

2. The integrated carbon fiber debonding and degassing device according to claim 1, characterized in that: A vacuum pipe (18) is arranged on the degassing tower (1), and an external vacuum device is connected to the interior of the degassing tower (1) through the vacuum pipe (18).

3. The integrated carbon fiber debonding and degassing device according to claim 1, characterized in that: A plurality of distribution pipes (11) are arranged in the degassing and debubbling tower (1), the plurality of distribution pipes (11) are arranged in parallel with each other, and a feed pipe is connected to each distribution pipe (11) respectively, and a discharge end of each distribution pipe (11) is located above the distribution plate (2).

4. The integrated carbon fiber debonding and degassing device according to claim 1, characterized in that: The outer periphery of the distribution plate (2) is fixedly connected to the inner ring of the desinging tower (1), and the first liquid holes are evenly distributed on the distribution plate (2); The outer periphery of the redistributor (4) is fixedly connected to the inner circle of the desing and debubbling tower (1), and the second liquid-passing holes are evenly distributed on the redistributor (4); The first liquid passage hole and the second liquid passage hole are both used for circulating the raw liquid to be processed.

5. The integrated carbon fiber debonding and degassing device according to claim 1, characterized in that: The packing layer (3) comprises a packing support, and the packing support is fixedly installed in the desing and degassing tower (1), the packing support is a frame structure, a packing body is arranged in the packing support, and the packing body is a ball ring.

6. The integrated carbon fiber debonding and degassing device according to claim 1, characterized in that: The deaerator (5) is an umbrella surface deaerator (5), and a plurality of small holes are arranged on the umbrella surface of the umbrella surface deaerator (5).

7. The integrated carbon fiber debonding and degassing device according to claim 1, characterized in that: The bottom of the degassing tower (1) is a conical structure, and an observation window mirror (19) is installed on the tower body of the degassing tower (1).

8. The integrated carbon fiber debonding and degassing device according to claim 1, characterized in that: A steam flow channel is provided on the side wall of the casing of the reboiler (8), the inlet end of the steam flow channel is connected to the steam pipeline (13), and the outlet end of the steam flow channel is connected to the first condensate pipeline (14).

9. The integrated carbon fiber debonding and degassing device according to claim 1, characterized in that: An upper liquid bag (7) is arranged at the upper end of the reboiler (8), and a lower liquid bag (9) is arranged at the lower end of the reboiler (8). The upper liquid bag (7) is connected to the feed end of the distribution pipe (17), and a second condensate pipeline (16) is installed at the lower end of the lower liquid bag (9). A stuffing pipe (15) is arranged on the reboiler (8).

10. The integrated carbon fiber debonding and degassing device according to claim 9, characterized in that: The absorbent is dimethyl sulfoxide, and a demister (20) is arranged in the upper liquid bag (7).

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