CN211677211U - Coagulating bath for preparing variable-aperture hollow fiber membrane - Google Patents
Coagulating bath for preparing variable-aperture hollow fiber membrane Download PDFInfo
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- CN211677211U CN211677211U CN202020135301.6U CN202020135301U CN211677211U CN 211677211 U CN211677211 U CN 211677211U CN 202020135301 U CN202020135301 U CN 202020135301U CN 211677211 U CN211677211 U CN 211677211U
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Abstract
The utility model relates to a preparation equipment of hollow fiber membrane, in particular to a coagulating bath groove for preparing variable aperture hollow fiber membrane. A coagulating bath for preparing a variable-aperture hollow fiber membrane comprises a main bath body for storing coagulating bath liquid, a concentration adjusting box for adjusting the concentration of the coagulating bath liquid in the box and a wire guide part for leading in and leading out hollow fiber membrane wires, wherein the wire guide part is arranged at the bottom of the main bath body, a concentration adjusting box cover is arranged outside the wire guide part and is connected with the bottom of the main bath body, and the top of the concentration adjusting box is positioned below the liquid level of the coagulating bath liquid of the main bath body. The utility model discloses simple structure, processing is convenient, on the basis of each equipment of conventional technology, only needs to add this coagulating bath, can make and become aperture hollow fiber membrane, promotes the filter effect of hollow fiber membrane in the sewage treatment that the pollutant constitutes complicacy greatly.
Description
Technical Field
The utility model relates to a preparation equipment of hollow fiber membrane, in particular to a coagulating bath groove for preparing variable aperture hollow fiber membrane.
Background
The hollow fiber membrane is a key component in the application of the membrane separation technology, and the membrane separation technology is widely applied to various fields of water treatment, seawater desalination, biological medical treatment and the like. The conventional preparation method of the hollow fiber membrane is a solution phase inversion method, and the process is as follows: extruding a casting solution consisting of a polymer, a solvent and a pore-forming agent into a spinning nozzle under pressure, simultaneously enabling a pretreated weaving tube to pass through the center of the spinning nozzle, co-extruding the casting solution and the weaving tube from the spinning nozzle under the combined action of carrying and pressure of the weaving tube, uniformly coating the casting solution on the outer surface of the fiber weaving tube, and immersing the casting solution and the weaving tube into a solidification bath tank to carry out double diffusion after a section of air bath: the solvent in the casting solution diffuses into the coagulation bath and the coagulant in the coagulation bath diffuses into the trickle in the casting solution. The inner side and the outer side of the membrane simultaneously generate a gelation process, the composition in the membrane casting solution is continuously changed along with the double diffusion, the membrane is completely solidified, and the surface of the membrane is formed into a micropore through hole, thus finally obtaining the hollow fiber membrane.
The conventional preparation method considers the aspects of coagulating bath stability, uniformity and the like of the hollow fiber membrane, and other preparation methods consider ensuring the molding quality of the hollow fiber membrane or improving the quality of the hollow fiber membrane, and the pore-forming of the hollow fiber membrane prepared by the preparation methods is a through hole with consistent pore diameter, so that the membrane material has a good effect in common water treatment application, but for sewage treatment with more complex pollutant composition, the hollow fiber membrane with the pore diameter changed along the axial direction of the pore (namely the through hole with the cross section similar to a bell mouth) can achieve an excellent filtering effect, and the hollow fiber membrane with the microporous structure cannot be prepared by the conventional equipment, and special preparation equipment and a preparation method are needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coagulating bath groove for preparing become aperture hollow fiber membrane to solve the background art in the problem.
The utility model provides a technical scheme that its technical problem adopted is:
a coagulating bath for preparing a variable-aperture hollow fiber membrane comprises a main bath body for storing coagulating bath liquid, a concentration adjusting box for adjusting the concentration of the coagulating bath liquid in the box and a wire guide part for leading in and leading out hollow fiber membrane wires, wherein the wire guide part is arranged at the bottom of the main bath body, a concentration adjusting box cover is arranged outside the wire guide part and is connected with the bottom of the main bath body, and the top of the concentration adjusting box is positioned below the liquid level of the coagulating bath liquid of the main bath body. The utility model discloses in, the solvent system of organic solvent and water is adopted to the coagulation bath lotion, specifically is N, N-Dimethylformamide (DMF) and water, or Dimethylacetamide (DMAC) and water, wherein, DMF, DMAC have hydrophilicity.
Preferably, the height ratio range of the concentration adjusting box to the main tank body is 1: 2-2: 3.
preferably, the concentration adjusting box comprises an adjusting box body, a water inlet pipe and a concentration controller, the adjusting box body is a closed box body, the top of the adjusting box body is provided with a thread opening through which hollow fiber membrane threads penetrate, the lateral part of the adjusting box body is provided with a plurality of through holes used for communicating the inside and the outside of the adjusting box body, the bottom of the adjusting box body is fixedly connected with the bottom of the main groove body, the water inlet end of the water inlet pipe is arranged at the bottom in the adjusting box body, the water leading end of the water inlet pipe is arranged outside the adjusting box body, and the concentration.
Preferably, the concentration controller comprises an online liquid concentration meter, a control cabinet and an electric control valve, a liquid contact port of the online liquid concentration meter is arranged in the concentration adjusting box, the online liquid concentration meter is electrically connected with the electric control valve through the control cabinet, and the electric control valve is arranged on a water leading end of the water inlet pipe.
Preferably, the thread guiding part comprises a thread guiding main wheel, a main wheel fixing frame, a magnetic fixing block, a thread guiding auxiliary wheel and an auxiliary wheel support, the thread guiding main wheel is hinged to the main wheel fixing frame, the bottom of the main wheel fixing frame is connected with the bottom of the main groove body, the magnetic fixing block is arranged on the outer side of the bottom of the main groove body and opposite to the bottom of the main wheel fixing frame, the thread guiding auxiliary wheel is hinged to the auxiliary wheel support, and the auxiliary wheel support is arranged on the main wheel fixing frame.
Preferably, the magnetic fixing block is an electromagnet.
Preferably, a horizontal guide wheel component is arranged at the top of the main groove body and comprises a first guide wheel and a second guide wheel, the first guide wheel and the second guide wheel are horizontally arranged, and the first guide wheel is arranged right above the wire guide component. The first guide wheel is matched with the guide wire part to lead the hollow fiber membrane wire out vertically, and the horizontal guide wheel part leads the hollow fiber membrane wire to carry out a section of air bath.
Preferably, the bottom of the main groove body is provided with an auxiliary guide wheel component, the auxiliary guide wheel component comprises an auxiliary guide wheel and an auxiliary guide wheel bracket, the auxiliary guide wheel is hinged on the auxiliary guide wheel bracket, and the auxiliary guide wheel bracket is fixedly connected to the bottom of the main groove body and is parallel to the guide wheel component.
The utility model has the advantages that:
the utility model discloses a coagulating bath groove of preparation variable aperture hollow fiber membrane, simple structure, processing is convenient, on the basis of each equipment of conventional technology, only needs to add this coagulating bath groove, can make the variable aperture hollow fiber membrane, promotes the filter effect of hollow fiber membrane in the sewage treatment that the pollutant constitutes complicacy greatly, the utility model discloses a preparation method simple process, convenient operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic front view of the present invention;
fig. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic structural diagram of the concentration adjusting box of the present invention;
fig. 4 is a schematic structural view of the guide wire member of the present invention;
fig. 5 is a process diagram of the present invention.
In the figure: 1. the device comprises a main tank body, 2, a concentration adjusting box, 3, a yarn guide part, 4, a first guide wheel, 5, a second guide wheel, 6, an auxiliary guide wheel, 7, an auxiliary guide wheel support, 8, an adjusting box body, 9, a water inlet pipe, 10, a yarn through port, 11, a through hole, 12, a water inlet end, 13, a water guide end, 14, an online liquid concentration meter, 15, a control cabinet, 16, an electric control valve, 17, a liquid contact port, 18, a yarn guide main wheel, 19, a main wheel fixing frame, 20, a magnetic fixing block, 21, a yarn guide auxiliary wheel, 22 and an auxiliary wheel support.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific embodiments and with reference to the accompanying drawings. It is to be understood that the practice of the present invention is not limited to the following examples, and that any modifications and/or changes in form made to the present invention are intended to fall within the scope of the present invention.
In the utility model, all parts and percentages are weight units, and the adopted equipment, raw materials and the like can be purchased from the market or commonly used in the field if not specified. The methods in the following examples are conventional in the art unless otherwise specified. The components or devices in the following examples are, unless otherwise specified, standard parts or parts known to those skilled in the art, the structure and principle of which are known to those skilled in the art through technical manuals or through routine experimentation.
Example (b):
a coagulation bath for preparing a hollow fiber membrane with a variable aperture as shown in FIG. 1 comprises a main tank body 1 for storing coagulation bath liquid, a concentration adjusting tank 2 for adjusting the concentration of coagulation bath liquid in the tank, and a guide wire member 3 for introducing and withdrawing hollow fiber membrane filaments. The guide wire part is arranged at the bottom of the main groove body, the concentration adjusting box cover is arranged outside the guide wire part and is connected with the bottom of the main groove body, and the top of the concentration adjusting box is positioned below the liquid level of the coagulating bath liquid of the main groove body.
The top of the main groove body is provided with a horizontal guide wheel component, the horizontal guide wheel component comprises a first guide wheel 4 and a second guide wheel 5, the first guide wheel and the second guide wheel are horizontally arranged, and the first guide wheel is arranged right above the guide wire component. The first guide wheel is matched with the guide wire part to lead the hollow fiber membrane wire out vertically, and the horizontal guide wheel part leads the hollow fiber membrane wire to carry out a section of air bath.
The bottom of the main groove body is provided with an auxiliary guide wheel part, the auxiliary guide wheel part comprises an auxiliary guide wheel 6 and an auxiliary guide wheel bracket 7, the auxiliary guide wheel is hinged on the auxiliary guide wheel bracket, and the auxiliary guide wheel bracket is fixedly connected to the bottom of the main groove body and is arranged in parallel with the guide wheel part.
The height ratio range of the concentration adjusting box to the main tank body is 1: 2-2: in this example, the height ratio was selected to be 2: 3. as shown in fig. 2 and 3, the concentration adjusting tank includes an adjusting tank body 8, a water inlet pipe 9, and a concentration controller. The adjusting box body is a closed box body, the top of the adjusting box body is provided with a through-wire opening 10 through which hollow fiber membrane wires pass, the side part of the adjusting box body is provided with a plurality of through holes 11 used for communicating the inside and the outside of the adjusting box body, the bottom of the adjusting box body is fixedly connected with the bottom of the main groove body, the bottom plate is not arranged at the bottom of the adjusting box body, and the bottom of the adjusting box body can be directly welded at the bottom of the. The water inlet end 12 of the water inlet pipe is arranged at the bottom in the adjusting box body, and the water leading end 13 of the water inlet pipe is arranged outside the adjusting box body. The concentration controller is arranged on the side portion of the main groove body and comprises an online liquid concentration meter 14, a control cabinet 15 and an electric control valve 16, a liquid contact port 17 of the online liquid concentration meter is arranged in the concentration adjusting box, the online liquid concentration meter is electrically connected with the electric control valve through the control cabinet, and the electric control valve is arranged on a water diversion end of the water inlet pipe. The concentration of the coagulation bath liquid in the concentration adjusting box is monitored in real time through a liquid contact port of the online liquid concentration meter, the concentration of the coagulation bath liquid in the concentration adjusting box is continuously increased along with the continuous dissolution of a solvent in a hollow fiber membrane casting liquid, a concentration signal is converted into an electric signal by the online liquid concentration meter and transmitted to the control cabinet, the control cabinet is set to control the concentration of the coagulation bath liquid in the concentration adjusting box to be within a certain range, the control cabinet controls the electric control valve to open the water feeding pipe to feed water according to the electric signal, so that the concentration of the coagulation bath liquid in the concentration adjusting box is reduced, and the concentration of the coagulation bath liquid is.
As shown in fig. 4, the thread guiding component includes a thread guiding main wheel 18, a main wheel fixing frame 19, a magnetic fixing block 20, a thread guiding auxiliary wheel 21 and an auxiliary wheel support 22, the thread guiding main wheel is hinged on the main wheel fixing frame, the bottom of the main wheel fixing frame is connected with the bottom of the main groove body, the magnetic fixing block is arranged on the outer side of the bottom of the main groove body and opposite to the bottom of the main wheel fixing frame, the thread guiding auxiliary wheel is hinged on the auxiliary wheel support, and the auxiliary wheel support is arranged on the main wheel fixing frame. The magnetic fixing block is an electromagnet, the electromagnet is electrified to work when the coagulation bath tank is in a working state, the wire guide part is firmly fixed at the bottom in the concentration adjusting box body, and when the coagulation bath tank is in a non-working state and needs to be overhauled, the electromagnet circuit is closed, and the wire guide part can be moved to the top of the main tank body of the coagulation bath tank to be overhauled.
A method for preparing a hollow fiber membrane with a variable aperture adopts the coagulating bath to prepare the hollow fiber membrane, and comprises the following steps:
(1) injecting a coagulation bath solution into the main tank body to enable the concentration of DMF or DMAC in the coagulation bath solution to reach the original concentration A;
(2) adjusting the coagulating bath tank to enable the position of the guide wire part to be positioned right below the external spinning nozzle, vertically introducing the hollow fiber membrane yarn formed by the membrane casting solution into the coagulating bath solution of the main tank body through the guide wire part, and enabling a pore-forming agent in the membrane casting solution to be dissolved in the coagulating bath solution to enable the surface of the hollow fiber membrane yarn to form the upper part of a micropore with a large caliber;
(3) the concentration of DMF or DMAC in the coagulation bath liquid in the tank body is controlled to be reduced to be B through the concentration adjusting tank, so that concentration difference is generated between the main tank body and the concentration adjusting tank;
(4) vertically introducing the hollow fiber membrane wires into a concentration adjusting box through a wire guide part, and continuously dissolving a pore-forming agent in the membrane casting solution into the solidified bath solution in the concentration adjusting box to form the lower parts of micropores with small apertures on the surfaces of the hollow fiber membrane wires and form micropores with variable aperture;
(5) the hollow fiber membrane wires are vertically led out of the concentration adjusting box through the wire guiding component and then vertically led out of the main groove body, and the hollow fiber membrane with the variable aperture is obtained.
In the method, the original concentration A and the original concentration B of DMF or DMAC in the coagulation bath liquid are selected according to the actual product requirements. The original concentration A can be 1-40%, and the concentration B is lower than the original concentration A to generate concentration difference.
As another example, it is further preferable that the concentration B of DMF or DMAC in the coagulation bath is less than half of the original concentration a. At the moment, the concentration difference of the coagulation bath liquid between the main tank body and the concentration adjusting tank is larger, and the pore-forming shape of the variable-pore-diameter hollow fiber membrane is optimal.
The utility model discloses a process principle does, the braided tube that the coating has the membrane casting liquid enters into the coagulation bath that contains coagulation bath liquid in the conversion film-forming, or directly with the membrane casting liquid through the air bath enter into the coagulation bath that contains coagulation bath liquid in the conversion film-forming, when adopting the dipping coagulation method to carry out the phase inversion, be through the mutual diffusion of non-solvent in the membrane casting liquid in solvent and the coagulation bath liquid and the film-forming, the performance of membrane has been decided to a great extent to the mutual diffusion speed of the two, therefore, the mass transfer rate of the solvent in the coagulation bath liquid in the film-forming process can be controlled. The increase of the solvent in the coagulation bath solution can reduce the chemical potential change of the diffusion mass transfer exchange between the casting solution and the coagulation bath solution, thereby reducing the mutual diffusion rate, which on one hand reduces the concentration of the polymer at the interface of the membrane and the coagulation bath solution to promote the formation of a porous membrane skin layer, and on the other hand delays the phase separation time of the casting solution to tend to form a thick and dense skin layer, so that the coagulation bath solution with a large solvent content can form a part with larger micropores, the coagulation bath solution with a small solvent content can form a part with smaller micropores, and the diffusion pore-forming process of the casting solution in a main tank body and a concentration adjusting tank with different solvent concentrations is shown in fig. 5.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the scope of the claims.
Claims (8)
1. A coagulating bath for preparing a variable-aperture hollow fiber membrane is characterized in that: the coagulating bath for preparing the variable-aperture hollow fiber membrane comprises a main bath body for storing coagulating bath liquid, a concentration adjusting box for adjusting the concentration of the coagulating bath liquid in the box and a wire guiding component for leading in and leading out hollow fiber membrane wires, wherein the wire guiding component is arranged at the bottom of the main bath body, the concentration adjusting box is covered outside the wire guiding component and is connected with the bottom of the main bath body, and the top of the concentration adjusting box is positioned below the liquid level of the coagulating bath liquid of the main bath body.
2. The coagulation bath according to claim 1, wherein: the height ratio range of the concentration adjusting box to the main tank body is 1: 2-2: 3.
3. the coagulation bath according to claim 1, wherein: the concentration adjustment case include adjustment box, inlet tube and concentration controller, the adjustment box is airtight box, adjustment box top is equipped with the harness cord mouth that is used for the hollow fiber membrane silk to pass, adjustment box lateral part is equipped with a plurality of through-holes that are used for the intercommunication adjustment box inside and outside, adjustment bottom half rigid coupling owner cell body bottom, the bottom in the adjustment box is located to the end of intaking of inlet tube, outside the adjustment box was located to the diversion end of inlet tube, concentration controller located owner cell body lateral part.
4. The coagulation bath according to claim 3, wherein: the concentration controller comprises an online liquid concentration meter, a control cabinet and an electric control valve, a liquid contact port of the online liquid concentration meter is arranged in a concentration adjusting box, the online liquid concentration meter is electrically connected with the electric control valve through the control cabinet, and the electric control valve is arranged on a water diversion end of the water inlet pipe.
5. The coagulation bath according to claim 1, wherein: the thread guiding component comprises a thread guiding main wheel, a main wheel fixing frame, a magnetic fixing block, a thread guiding auxiliary wheel and an auxiliary wheel support, the thread guiding main wheel is hinged to the main wheel fixing frame, the bottom of the main wheel fixing frame is connected with the bottom of the main groove body, the magnetic fixing block is arranged on the outer side of the bottom of the main groove body and opposite to the bottom of the main wheel fixing frame, the thread guiding auxiliary wheel is hinged to the auxiliary wheel support, and the auxiliary wheel support is arranged on the main wheel fixing frame.
6. The coagulation bath according to claim 5, wherein: the magnetic fixing block is an electromagnet.
7. The coagulation bath according to claim 1, wherein: the guide wire device is characterized in that a horizontal guide wheel component is arranged at the top of the main groove body and comprises a first guide wheel and a second guide wheel, the first guide wheel and the second guide wheel are horizontally arranged, and the first guide wheel is arranged right above the guide wire component.
8. The coagulation bath according to claim 1, wherein: the auxiliary guide wheel support is fixedly connected to the bottom of the main groove body and arranged in parallel with the guide wire component.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020135301.6U CN211677211U (en) | 2020-01-20 | 2020-01-20 | Coagulating bath for preparing variable-aperture hollow fiber membrane |
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| CN202020135301.6U CN211677211U (en) | 2020-01-20 | 2020-01-20 | Coagulating bath for preparing variable-aperture hollow fiber membrane |
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