CN102284404A - Preparation method of tubular membrane for membrane distillation - Google Patents
Preparation method of tubular membrane for membrane distillation Download PDFInfo
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- CN102284404A CN102284404A CN2010102020321A CN201010202032A CN102284404A CN 102284404 A CN102284404 A CN 102284404A CN 2010102020321 A CN2010102020321 A CN 2010102020321A CN 201010202032 A CN201010202032 A CN 201010202032A CN 102284404 A CN102284404 A CN 102284404A
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- tubular film
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Abstract
The invention relates to a preparation method of a tubular membrane for membrane distillation, in particular to a preparation method of a nano fiber tubular membrane. Aiming at the defects in the conventional preparation method of the tubular membrane, the invention provides a membrane-preparing scheme of the tubular membrane with high porosity, which has the advantages of less equipment investment, simple process and simplicity in operation. The scheme is as follows: a high polymer material solution suitable for membrane distillation is sprayed on a tubular support by adopting an electrostatic spinning membrane-preparing method so as to form a uniform tubular membrane layer. Equipment is an electrostatic spinning tubular membrane-preparing device, and a membrane receiving system comprises a plurality of respectively-rotating supporting tubes. The supporting tubes are arranged around the surface of a central circular roll and are attached on the surface. A circular bracket is used for supporting and limiting two ends of the supporting tubes. The central circular roll rotates and drives the supporting tubes to rotate relative to the circular bracket, the circular bracket makes a concentric rotation relative to the central circular roll, and a uniform nano fiber tubular membrane is formed on the supporting tubes through electrostatic spinning.
Description
Technical field
The present invention relates to a kind of tubular film preparation method who is used for the film distillation, relate to a kind of electrostatic spinning tubular film preparation method, relate to a kind of nano-fiber tubular membrane preparation method, belong to preparation of membrane science and membrane material and film distillation field.
Technical background
Membrane technology is with industry and science and technology development, and purposes more and more widely in a lot of fields.Membrane module has plate and frame, tubular type, doughnut formula, screw winding formula etc.The tubular film assembly is owing to can control concentration polarization effectively, and flow regime is good, can regulate flow velocity on a large scale; Film cleans after generating dirt easily; Less demanding to the feed liquid preliminary treatment, be widely used.Conventional tubular film preparation method can see that in textbook " study course of membrane science technical application " Chemical Industry Press in February, 2005 version of editing as An Shusheng has detailed narration for the 22nd to 24 page.It is the macromolecular material of coating last layer suitable thickness on the circular support body of porous that its method is mainly put, and drying and forming-film forms.This method one straight edge there is no breakthrough change with so far.The shortcoming of conventional preparation tubular process: 1, equipment investment height, operating cost are big.2, with the plate type membrane component ratio, the difficult control of the preparation condition of film, and also ferrule is difficult.3, the tubular film porosity is low, and wayward.
The content of invention
The present invention is directed to the shortcoming that the conventional preparation method of tubular film exists, propose a system film scheme that the tubular film porosity that equipment investment is few, technology is simple to operation, make is high.This programme is that the macromolecule material solution that adopts electrostatic spinning system embrane method will be suitable for the film distillation is sprayed on the tubular support, forms the uniform rete of tubulose.Its equipment is electrostatic spinning tubular film preparation facilities, and the receiving system of film is the stay pipe of a plurality of each spinning.
2 some of the stay pipes of selection making tubular film, its diameter of phi 10-20mm.Indicate that as figure 2b is the screen cloth pipe, length is 300-1000mm.2a is two sections metal tubes that are connected with screen cloth pipe 2b, and length is decided on demand.In order to make the needs of vacuum membrane distillation device, wherein one section metal tube top is sealed.Stay pipe is arranged around a center circle roller 1 surface, and is close to the surface.Design the center circle roller 1 that length and screen cloth pipe 2b are complementary, diameter of phi 400-600mm, the one layer of polymeric material is enclosed on the surface, to increase skin-friction force.Its effect is to drive stay pipe 2 to rotate when center circle roller 1 rotates, and simultaneously the film that forms on stay pipe is played opsonic action.Design a circular support 3, its effect is the two ends of supporting and limit stay pipe 2, and its diameter requires to make the stay pipe surface to contact with center circle roller surface.Circular support 3 should be to be slidingly matched with stay pipe 2, when center circle roller 1 rotates, can drive stay pipe 2 and rotate relative to circular support 3.Center circle roller 1 velocity of rotation can be regulated, and regulates according to shower nozzle 4 Polymer Solution discharge rates, center circle roller diameter and stay pipe diameter proportion relation, and purpose is that the film of requirement stay pipe 2 receptions is even.Circular support 3 is done to rotate with one heart relative to center circle roller 1 simultaneously, so that each stay pipe can both receive the spray cortina equably.Its rotating speed is adjustable, and generally the rotating speed than center circle roller is low.The rotating speed of circular support has determined stay pipe time of staying in spray silk scope, is related to the thickness of tubular film, regulates the rotating speed of circular support 3 according to the tubular film thickness requirement.
Description of drawings
Fig. 1 is the tubular film preparation facilities schematic diagram of film distillation, and 1 is the center circle roller, and 2 is stay pipe, and 3 is circular support, and 4 is electrostatic spinning nozzle.
Fig. 2 is the stay pipe schematic diagram of tubular film, and 2a is two sections metal tubes that are connected with the screen cloth pipe, and 2b is the screen cloth pipe.
The specific embodiment
Before making tubular film, at first select to be suitable for the material of film distillation.The membrane material of film distillation should be to have hydrophobic property, if it is better to have super-hydrophobicity.In hydrophobic material, be preferred material with polytetrafluoroethylene (PTFE), Kynoar, polypropylene.For making things convenient for electrostatic spinning, selecting Kynoar (PVDF) molecular weight is suitable at 60-80 ten thousand.PVDF is dissolved in the mixed solvent of methyl pyrrolidone or dimethyl formamide (DMF) or DMF and acetone, is made into the solution of 8-10%.Owing to be electrostatic spinning system film, for the PVDF solution system, shower nozzle should connect the negative high voltage dc source, and positive ending grounding.The tubulose film forming apparatus connect all ground connection well of a system, center circle roller, circular support.Will control electrospinning environment temperature and humidity simultaneously, temperature is crossed and low easily caused the electrospinning cortina not do and fiber is bonded together, and reflects the porous of ringing film.The too high long beard of shower nozzle that easily makes of temperature influences electrospinning stability, easily causes flyings simultaneously.General temperature is controlled at 30-50 ℃, decides on electrospinning liquid solvent evaporates degree.When humidity was too big, because the heat absorption of electrospinning process solvent evaporates, the condensation of water in air steam formed water.Destroyed the current field condition of electrospinning thus, and film can not be attached on the supporter well.Therefore, preferably humidity is controlled at below 40%.
Example
With molecular weight is that 600,000 PVDF is dissolved in the mixed solvent of DMF and acetone, and concentration is 10gPVDF in every 100ml mixed solvent.In order to obtain the film of high porosity, select the volume ratio DMF of mixed solvent to account for 60%.Constant temperature stirs down for 40 ℃, makes the PVDF molecule obtain best stretching, extension in mixed solvent.Use the rotary viscosity measuring solution viscosity, when viscosity reaches maximum, show that macromolecule PVDF molecule obtains best stretching, extension in mixed solvent.This moment, solution can be stand-by, enters the electrostatic spinning operation.When the operating room temperature reaches 30 ℃, humidity is carried out electrostatic spinning below 40%.Regulate the rotating speed of center circle roller 1, make the film that is deposited on the stay pipe even.Regulate the rotating speed of circular support 3, make the thickness that deposits on each stay pipe identical.When the thicknesses of layers that is used for film distillation when the stay pipe skin reaches requirement, stop the electrostatic spinning operation.Take off the film pipe from circular support 3,, the most important thing is metal tube 2a good seal rete two ends and stay pipe through suitably arrangement.Encapsulating method can be used PVDF solution, also available heat melten gel etc.By the film distillation tubular film that this method makes, rete is made of a kind of nanofiber, therefore can be called film distillation nano-fiber tubular film.The porosity of film can reach 50-80%.
Industrial applicibility
The preparation method of electrostatic spinning tubular film not only is suitable for preparing film distillation tubular film, also can be suitable for preparing tubular ultrafiltration, tubulose NF membrane, tubulose micro-filtration membrane.Compare with the traditional preparation process method, have that equipment investment is few, technology is simple to operation, ferrule is easy, the porosity advantages of higher of film.
Claims (8)
1. one kind is used for the tubular film preparation method that film distills, and its equipment is electrostatic spinning tubular film preparation facilities, and the receiving system that it is characterized in that film is the stay pipe of a plurality of each spinning.
2. tubular film preparation facilities according to claim 1 is characterized in that stay pipe (2) diameter of phi 10-20mm, and screen cloth pipe (2b) length is 300-1000mm.
3. tubular film preparation facilities according to claim 1 is characterized in that (2a) two sections of stay pipe (2) is the metal tubes that are connected with screen cloth, and length is decided on demand, and wherein one section metal tube top is sealed.
4. tubular film preparation facilities according to claim 1 is characterized in that stay pipe (2) around the arrangement of a center circle roller (1) surface, and is close to the surface.
5. tubular film preparation facilities according to claim 1 is characterized in that the two ends of stay pipe (2) are supported and limited by circular support (3), and the diameter of (3) requires to make the stay pipe surface to contact with center circle roller surface.
6. tubular film preparation facilities according to claim 1 is characterized in that center circle roller (1) length and screen cloth pipe (2b) are complementary, diameter of phi 400-600mm, and the one layer of polymeric material is enclosed on the surface.
7. tubular film preparation facilities according to claim 1, it is characterized in that center circle roller (1) rotates drive stay pipe (2) and rotates relative to circular support (3), velocity of rotation is regulated according to shower nozzle (4) Polymer Solution discharge rate, center circle roller diameter and stay pipe diameter proportion relation.
8. tubular film preparation facilities according to claim 1 is characterized in that circular support (3) rotates with one heart relative to center circle roller (1), and rotating speed is regulated according to the tubular film thickness requirement, and is generally low than center circle roller rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102020321A CN102284404A (en) | 2010-06-18 | 2010-06-18 | Preparation method of tubular membrane for membrane distillation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102020321A CN102284404A (en) | 2010-06-18 | 2010-06-18 | Preparation method of tubular membrane for membrane distillation |
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| CN102284404A true CN102284404A (en) | 2011-12-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103239992A (en) * | 2012-02-02 | 2013-08-14 | 刘冉 | Simple membrane distillation apparatus |
| CN103263856A (en) * | 2013-05-28 | 2013-08-28 | 东华大学 | Preparation method of electrostatic spinning hydrophobic nanofiber porous membrane for membrane distillation |
| CN104001345A (en) * | 2013-02-25 | 2014-08-27 | 刘钢 | Nano-fibrous tubular membrane extraction apparatus |
| CN109175880A (en) * | 2018-11-17 | 2019-01-11 | 中国二十二冶集团有限公司 | Large-diameter pipeline contra-aperture device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62177235A (en) * | 1986-01-30 | 1987-08-04 | Mitsubishi Heavy Ind Ltd | Apparatus for spinning carbon fiber |
| WO2005123995A1 (en) * | 2004-06-17 | 2005-12-29 | Korea Research Institute Of Chemical Technology | Filament bundle type nano fiber and manufacturing method thereof |
| CN200999274Y (en) * | 2007-01-24 | 2008-01-02 | 大连振邦集团有限公司 | Multi-sprayer static spinning film producing apparatus |
| CN101474105A (en) * | 2008-12-10 | 2009-07-08 | 同济大学 | Parallel type electrostatic filature blood vessel support collector |
-
2010
- 2010-06-18 CN CN2010102020321A patent/CN102284404A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62177235A (en) * | 1986-01-30 | 1987-08-04 | Mitsubishi Heavy Ind Ltd | Apparatus for spinning carbon fiber |
| WO2005123995A1 (en) * | 2004-06-17 | 2005-12-29 | Korea Research Institute Of Chemical Technology | Filament bundle type nano fiber and manufacturing method thereof |
| CN200999274Y (en) * | 2007-01-24 | 2008-01-02 | 大连振邦集团有限公司 | Multi-sprayer static spinning film producing apparatus |
| CN101474105A (en) * | 2008-12-10 | 2009-07-08 | 同济大学 | Parallel type electrostatic filature blood vessel support collector |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103239992A (en) * | 2012-02-02 | 2013-08-14 | 刘冉 | Simple membrane distillation apparatus |
| CN104001345A (en) * | 2013-02-25 | 2014-08-27 | 刘钢 | Nano-fibrous tubular membrane extraction apparatus |
| CN103263856A (en) * | 2013-05-28 | 2013-08-28 | 东华大学 | Preparation method of electrostatic spinning hydrophobic nanofiber porous membrane for membrane distillation |
| CN109175880A (en) * | 2018-11-17 | 2019-01-11 | 中国二十二冶集团有限公司 | Large-diameter pipeline contra-aperture device |
| CN109175880B (en) * | 2018-11-17 | 2024-02-23 | 中国二十二冶集团有限公司 | Large-diameter pipeline aligning device |
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Application publication date: 20111221 |