CN113856475B - Rinsing method and device for hollow fiber membrane - Google Patents
Rinsing method and device for hollow fiber membrane Download PDFInfo
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- CN113856475B CN113856475B CN202111234924.4A CN202111234924A CN113856475B CN 113856475 B CN113856475 B CN 113856475B CN 202111234924 A CN202111234924 A CN 202111234924A CN 113856475 B CN113856475 B CN 113856475B
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- rinsing
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- membrane
- hollow fiber
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- 239000012528 membrane Substances 0.000 title claims abstract description 66
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000004140 cleaning Methods 0.000 claims abstract description 41
- 239000002351 wastewater Substances 0.000 claims abstract description 13
- 238000004821 distillation Methods 0.000 claims abstract description 5
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims description 2
- 239000002904 solvent Substances 0.000 abstract description 18
- MHABMANUFPZXEB-UHFFFAOYSA-N O-demethyl-aloesaponarin I Natural products O=C1C2=CC=CC(O)=C2C(=O)C2=C1C=C(O)C(C(O)=O)=C2C MHABMANUFPZXEB-UHFFFAOYSA-N 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000009987 spinning Methods 0.000 abstract description 6
- 238000003825 pressing Methods 0.000 description 9
- 239000003960 organic solvent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of spinning, and particularly relates to a rinsing method and a rinsing device for a hollow fiber membrane. In the rinsing channel, the movement directions of the membrane wires and the water flow are opposite, turbulent countercurrent cleaning is formed by controlling the flow velocity of the cleaning liquid, most DMAC solvent on the surface of the membrane wires can be effectively removed, then the membrane wires are further cleaned through the rinsing tank, the cleaning effect is good, the quality of the membrane wires is improved, meanwhile, the replacement ratio of the cleaning liquid in the rinsing tank is effectively reduced, and the consumption of the cleaning liquid is saved. In addition, the device improves the DMAC solvent content in the rinsing wastewater, can effectively reduce the treatment load of a subsequent wastewater treatment distillation tower, reduces the wastewater treatment investment cost, and saves the energy consumption.
Description
Technical Field
The invention belongs to the technical field of spinning, and particularly relates to a rinsing method and a rinsing device for a hollow fiber membrane.
Background
Hollow fiber membranes are widely used in various fields of medicine, food, environmental protection, and daily life due to their unique advantages. In the method for preparing the hollow fiber membrane by spinning, the feed liquid and the core liquid (or the lining pipe) are generally injected into a spinning nozzle at the same time, the spinning nozzle is used for extrusion molding, and the prepared membrane is solidified by a coagulating bath, rinsed and collected in a winding way. The hollow fiber membrane yarn is provided with a large amount of solvent in the preparation process, the solvent is required to be removed in a rinsing mode, at present, most of the rinsing of the hollow fiber membrane yarn adopts a soaking mode, the cleaning liquid is static or slowly flows on the surface of the membrane yarn, the solvent DMAC on the surface of the membrane yarn is tightly diffused to the self, and diffuses into the cleaning liquid, so that the speed is slower, when the dynamic balance is achieved, the cleaning effect is poorer, fresh cleaning liquid is required to be continuously supplemented for cleaning, and meanwhile, the cleanliness of the membrane yarn is also influenced, and the quality of the membrane yarn is influenced. In addition, at present, the rinsing wastewater of membrane wires is treated and recycled in a domestic mode, the wastewater amount generated by the existing membrane wire rinsing method is large, the content of solvent (DMAC) in the wastewater is low, so that the treatment load of a rectifying tower is large, the investment cost is high, the production scale is limited, and meanwhile, the energy consumption for treating the rinsing wastewater is large, the treatment cost is high, and resources are wasted.
Disclosure of Invention
The online rinsing device provided by the invention aims to solve the problems of unsatisfactory cleaning effect, large sewage yield, low concentration of DMAC solvent in rinsing wastewater, difficult subsequent treatment, high rinsing wastewater treatment investment cost, large energy consumption and the like in the use process of the conventional rinsing device. The device can improve the concentration of DMAC solvent in rinsing wastewater, is favorable for subsequent sewage treatment, saves energy consumption and investment cost, realizes the reuse of cleaning liquid, saves the consumption of the cleaning liquid, has good rinsing effect of membrane filaments, and improves the quality of the membrane filaments.
A method for rinsing a hollow fiber membrane, comprising the steps of:
flowing the rinse liquid from the rinse tank into the rinse shaft;
the hollow fiber membrane yarn sprayed out of the spinning head moves from the rinsing channel to the rinsing tank, so that the hollow fiber membrane yarn is contacted and washed with rinsing liquid in the rinsing channel and the rinsing tank in sequence, and residual organic solvent is removed; the rinsing channel is tubular.
The organic solvent is selected from amide solvents.
The rinsing liquid is water-based rinsing liquid.
The diameter of the rinsing channel is 5-200mm, the diameter of the hollow fiber membrane filaments is 0.1-2mm, and 1-300 hollow fiber membrane filaments can be accommodated in the rinsing channel.
Negative pressure is also applied to the rinsing channel during the contact washing process.
The temperature of the rinse solution is preferably from 0 to 150 ℃.
The flow rate of the rinsing liquid in the rinsing channel is 0.2-1m/s.
A hollow fiber membrane rinsing apparatus comprising:
a rinse tank;
a tubular rinsing shaft;
the rinsing channel is provided with a rinsing channel water inlet and a rinsing channel water outlet, and the rinsing channel water inlet is connected with a rinsing tank water outlet of the rinsing tank;
and the driving wheel is used for pulling the hollow fiber membrane wires into the rinsing groove from the rinsing channel.
Further comprises: the yarn pressing wheel is positioned in the rinsing tank and is used for pulling the hollow fiber membrane yarns to the position below the liquid level of the rinsing liquid.
The two ends of the rinsing channel are respectively provided with a yarn inlet and a yarn outlet.
The water outlet of the rinsing channel is close to the yarn inlet, and the water inlet of the rinsing channel is close to the yarn inlet.
Further comprises: and the supporting device is used for supporting the rinsing channel.
Further comprises: the vacuumizing port is connected with the water outlet of the rinsing channel and is used for applying negative pressure to the rinsing channel.
The number of the rinsing channels is 1-100.
The included angle between the rinsing channel and the normal line of the horizontal plane is 0-90 degrees.
The diameter of the rinsing channel is 5-200mm.
Advantageous effects
1. According to the hollow fiber membrane wire cleaning device, the rinsing module is arranged at the front end of the rinsing tank, the rinsing channel is arranged in the rinsing module, membrane wires are pre-rinsed through the rinsing channel, the rinsing channel is small in diameter, the turbulent flow velocity is achieved by controlling the flow velocity of cleaning liquid, the rinsing effect is improved, the movement direction of the membrane wires is opposite to the flow direction of water flow, countercurrent cleaning is formed, most of DMAC solvent on the surfaces of the membrane wires can be effectively removed under the combined action of turbulent flow and countercurrent, and then the membrane wires are further cleaned through the rinsing tank, so that the cleaning effect is good, the quality of the membrane wires is improved, the replacement ratio of the cleaning liquid in the rinsing tank is effectively reduced, and the consumption of the cleaning liquid is saved.
2. The cleaning wastewater in the rinsing tank is cleaned through the rinsing channel, so that the DMAC solvent content in the rinsing wastewater is further improved, the treatment load of a subsequent wastewater treatment distillation tower can be effectively reduced, the production investment cost is reduced, and the energy consumption is saved.
3. The cleaning liquid in the rinsing channel is sourced from the rinsing tank, so that the recycling of the cleaning waste liquid is realized, and the consumption of the cleaning liquid is saved.
Drawings
FIG. 1 is a diagram of an apparatus of the present invention;
FIG. 2 is a block diagram of a rinse shaft;
wherein,
1. a rinsing module, 2, a rinsing tank, 3, a rinsing channel, 4, a rinsing channel water inlet, 5, a driving wheel, 6, a yarn pressing wheel, 7, film yarns, 8, a rinsing tank water inlet, 9, a rinsing tank water outlet, 10, a connecting device, 11, a rinsing channel water outlet, 12, a supporting device, 13, a wire inlet, 14 and a wire outlet; 15. and (5) vacuumizing the mouth.
Detailed Description
The present invention is further described below in conjunction with embodiments, which are merely some, but not all embodiments of the present invention. Based on the embodiments of the present invention, other embodiments that may be used by those of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
With reference to fig. 1, the hollow fiber membrane online rinsing device comprises a rinsing module 1 and a rinsing tank 2, wherein a rinsing tank water inlet 8 is formed in the rinsing tank 2 (on the right side in the figure) and is used for continuously or intermittently feeding rinsing liquid into the rinsing tank, the rinsing module 1 is positioned at one side of the rinsing tank 2, a rinsing channel 3 is formed in the rinsing module, the rinsing module is tubular in structure and can accommodate running hollow fiber membrane wires 7, one end of the rinsing channel is provided with a wire inlet 13, the other end of the rinsing channel is provided with a wire outlet 14, a water inlet 4 and a water outlet 11 are fixed by a supporting device 12 and are placed at a certain angle, a driving wheel 5 and a wire pressing wheel 6 are arranged in the rinsing tank 2, the driving wheel 5 is provided with a rotary driving device, the wire pressing wheel is fixed on a guide rail in the rinsing tank and can move up and down, the membrane wires can be pulled out of the rinsing channel and enter the rinsing tank 2 through the driving wheel 5, and the wire pressing wheel 6 is ensured to be positioned below the liquid surface of the rinsing liquid in the rinsing tank 2; in a preferred embodiment, the number of the driving wheels is 1-50, and the wire pressing wheels are arranged on the guide rail and can move up and down, and the number of the wire pressing wheels is 1-50. The rinsing tank 2 is also provided with a water outlet 9 which is connected with the water inlet 4 of the rinsing shaft 3 by a connecting device 10.
According to the invention, membrane filaments firstly enter from a filament inlet 13 of a rinsing channel and pass through a filament outlet 14, a rinsing liquid enters from a water inlet of a rinsing tank and then flows into a water outlet 9 of the rinsing tank and then enters into a water inlet 4 of the rinsing channel and flows out from the water inlet, and a driving wheel 5 pulls out membrane filaments 11 from the rinsing channel 3 into the rinsing tank 2, so that the movement direction of the membrane filaments in the rinsing channel 3 is opposite to the water flow direction, cross flow cleaning is formed, meanwhile, due to the smaller diameter of the rinsing channel, the shearing force of liquid is larger due to the smaller hydraulic diameter of the rinsing channel, most of solvent on the surface of the membrane filaments can be cleaned under the combined action of cross flow and shearing, and the membrane filaments are further cleaned through the rinsing tank; in a preferred embodiment, the number of the rinsing channels is 1-100, 1-300 membrane wires can be passed through each rinsing channel, the rinsing channels are obliquely arranged, the inclination angle of the rinsing channels is 0-90 degrees (the included angle between the rinsing channels and the normal line of the horizontal plane), the number of the rinsing channels can be cylindrical or square, the two ends of the rinsing channels are open, the number of the rinsing channels is 1-100, 1-300 membrane wires can be passed through each rinsing channel, and the diameter of the rinsing channels is 5-200mm.
Because the membrane silk is firstly subjected to preliminary high-strength cleaning through the water outlet of the rinsing tank, and then enters the rinsing tank 2 for rear-section cleaning, on one hand, more solvent is removed through the channel cleaning of the front section by utilizing the characteristic of fluid, and the DMAC solvent on the membrane silk can be deeply removed through the rinsing action of the rear section, so that the cleaning effect is good, the quality of the membrane silk is improved, meanwhile, the cleaning liquid replacement frequency in the rinsing tank is effectively reduced, and the water is saved. In the embodiment of fig. 2, a vacuum-pumping port 15 is further arranged at the water outlet 11 of the rinsing shaft, and the opening position of the water outlet 11 is downward, so that negative pressure is formed in the rinsing shaft 3 through the action of the vacuum-pumping port 15, and residual DMAC in the membrane wires is more favorably oozed outwards into the rinsing liquid, thereby improving the cleaning effect.
Example 1
The specific operation process is as follows:
1. threading: about 140 hollow fiber membrane filaments extruded by a spinneret with the diameter of 0.8-1.5mm enter a rinsing channel from a filament inlet of the rinsing channel, the cross section of the rinsing channel is circular, the inner diameter is 90mm, the length is about 1m, the membrane filaments pass through the rinsing channel and pass through the filament outlet to pass out, the membrane filaments sequentially pass through the upper part of a driving roller, and the membrane filaments are horizontally moved from one end to the other end by the rotation of the driving roller, wherein the moving speed is about 0.4m/s.
2. Pre-rinsing: the lifting pump is started, cleaning liquid (controlling the water temperature to be 40-45 ℃) enters the rinsing channel from the outlet of the rinsing channel through the water inlet of the rinsing channel, the flow velocity of the cleaning liquid in the channel is about 0.4m/s, the movement direction of the film wire is opposite to the flow direction of the cleaning liquid, cross-flow cleaning is formed, and most of the solvent can be removed from the film wire in the efficient rinsing module.
3. Rinsing: and starting a yarn pressing wheel motor, and enabling the yarn pressing wheel to bring the film yarn into the bottom of the rinsing tank, so that the film yarn moves up and down in the rinsing tank to be rinsed further.
Example 2
In comparison with example 1, a negative pressure of-0.05 MPa was simultaneously applied to the rinsing shaft via the negative pressure suction port.
Comparative example 1
In comparison with example 1, the rinsing tank was directly used for cleaning.
After the rinsing process was run continuously for 2 hours, the DMAC concentration was measured from the water sample in the rinse tank and compared with the direct rinse tank cleaning without the rinse shaft, as follows:
it can be seen that the residual organic solvent on the surface of the membrane filaments can be removed more rapidly by the method of the invention, so that the solvent is more dissolved in the rinsing liquid, and the rapid dissolution of the solvent from the surface of the membrane filaments in the channel can be improved by the negative pressure method.
The membrane rinsing method can be used for rinsing hollow fiber membranes, flat plate membranes and tubular membranes.
The cleaning liquid for rinsing the channel is sourced from the rinsing tank, and the cleaning liquid is further cleaned through the rinsing tank, so that the concentration of the solvent in the cleaning liquid can be effectively increased, the subsequent treatment of cleaning wastewater is facilitated, the load of the distillation tower is relieved, the energy consumption is saved, and the investment cost is saved.
Claims (2)
1. A method for reducing the treatment load of a distillation tower for treating waste water, wherein the waste water is waste water after rinsing hollow fiber membrane filaments, and the method is characterized by comprising the following steps:
the membrane silk firstly enters through a silk inlet (13) of a rinsing channel, passes through a silk outlet (14), and after entering through a water inlet of a rinsing tank, the rinsing liquid flows in from a water outlet (9) of the rinsing tank and then enters into a water inlet (4) of the rinsing channel, and enters from the water inlet and flows out from the water outlet, and a driving wheel (5) pulls out a membrane silk (7) from the rinsing channel (3) into the rinsing tank (2), so that the movement direction of the membrane silk in the rinsing channel (3) is opposite to the water flow direction, and cross flow cleaning is formed;
the rinsing channel is tubular; negative pressure is applied to the rinsing channel in the process of contact washing; the flow rate of the rinsing liquid in the rinsing channel is 0.2-1m/s;
the rinsing liquid is water-based rinsing liquid;
a rinsing device for hollow fiber membranes, comprising:
a rinsing tank (2);
a tubular rinsing shaft (3);
and a rinsing channel (3) is provided with a rinsing channel water inlet (4) and a rinsing channel water outlet (11), the rinsing channel water inlet
(4) Is connected with a rinsing tank water outlet (9) of the rinsing tank (2);
a driving wheel (5) for pulling the hollow fiber membrane filaments from the rinsing channel (3) into the rinsing tank (2); the diameter of the rinsing channel is 5-90mm, and 1-300 hollow fiber membrane wires with the diameter of 0.1-2mm can be accommodated in the rinsing channel, and the device further comprises: a vacuumizing port (15) connected with the rinsing channel water outlet (11) and used for applying negative pressure to the rinsing channel (3); the included angle between the rinsing channel and the normal line of the horizontal plane is 0-90 degrees.
2. The method for reducing the treatment load of a wastewater treatment distillation column according to claim 1 wherein the temperature of the rinse liquid is 0 to 150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111234924.4A CN113856475B (en) | 2021-10-22 | 2021-10-22 | Rinsing method and device for hollow fiber membrane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111234924.4A CN113856475B (en) | 2021-10-22 | 2021-10-22 | Rinsing method and device for hollow fiber membrane |
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| CN113856475A CN113856475A (en) | 2021-12-31 |
| CN113856475B true CN113856475B (en) | 2024-02-09 |
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| CN114377553B (en) * | 2022-01-14 | 2024-04-02 | 南宁市生升膜分离技术应用研究所 | Preparation method of hollow fiber ultrafiltration membrane |
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| CN113856475A (en) | 2021-12-31 |
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