CN1157185A - Solvent-resisting hollow fibre ultrafiltration membrane module - Google Patents
Solvent-resisting hollow fibre ultrafiltration membrane module Download PDFInfo
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- CN1157185A CN1157185A CN 96116260 CN96116260A CN1157185A CN 1157185 A CN1157185 A CN 1157185A CN 96116260 CN96116260 CN 96116260 CN 96116260 A CN96116260 A CN 96116260A CN 1157185 A CN1157185 A CN 1157185A
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Abstract
The present invention relates to a solvent-resisting hollow fibre ultrafiltration membrane module made of PVDF (polyvinylidene fluoride) membrane. Its formula composition mainly is composed of PVDF, strong orgnaic solvent and inorganic salt with weight ratio of 15-30:60-80:6.5-9.5. Said strong organic solvent is composed of dimethylacetamide and dimethylformamide. The invented product can be prepared by solution spinning process, and can be compared favourably with PP membrane, not only possesses large trapped molecular weight range and extensive separation range, but also can be used for recovering various organic solvents and making temrinal filtration.
Description
The invention belongs to the hyperfiltration technique field that utilizes film to separate, particularly a kind of hollow fiber ultrafiltration membrane material group (device) part that adopts the solvent-resisting that new material makes.
In recent years, hyperfiltration technique makes significant progress at home, and China has become the country that has membrane separation technique after the U.S., Japan, the former Soviet Union.The characteristics of membrane separation technique are: the film separation process does not undergo phase transition, energy consumption is low, can carry out at normal temperatures, be applicable to from virus, bacterium to the extensive separating ranges of particulate, and membrane separation device is simple, easy to operate, control and safeguard the separative efficiency height.For the various film separation processes of better realization, each state is all developing various types of films material (mainly being to adopt polymeric membrane), but owing to be subjected to filming technology (often adopting the preparation of solution spinning or melt spinning method) the especially restriction of material of preparing kind (the material therefor kind is very narrow), the range of application of made various hollow-fibre membranes is restricted, except that being used for common water treatment, to some non-aqueous system, the purification that comprises drinks and other solvents etc. separates, and is but often powerless because of the poor performance such as anti-chemistry of existing membrane material.For example: use CA hollow membrane material (CAM) to make ultrafiltration module, its manufacture process is simple, and cost is lower, but its pH value accommodation narrow (5.5～7), thereby has restricted the development of this film.PS hollow membrane material (PS membrane), though the energy acid and alkali-resistance, intensity is also better, but when contacting,, produced swelling effect owing to itself molecular structure with ethanol, surface micropore is sharply dwindled, thereby the unit interval liquid flux sharply descends, drainage 2T/h equipment is done turbidity removal at 25 degree wine, urge old when going the anti-precipitation of macromolecule and going bacterium, the ultrafiltration effect of having only 100kg/h, when alcoholic strength was higher than 42 °, cortina began distortion, do not go out wine, even fracture of wire.And because itself structures shape, end-filtration equipment is made in the back that can not be used for ozone devices in water treatment, as does end-filtration and can not produce a desired effect, and oxidized easily the causing of film itself peel off, and has a strong impact on water quality.And, calling the exploitation of embrane method ultimate filter of new generation along with the development of bottled mineral water, ultra-pure water, space water.Developed at present the microporous polypropylene membrane (PP film) in addition of use, it is the supermicro filtration membrane of latest generation.China's Zhejiang University's polymer science and Materials Research Laboratories have taken the lead in trial-produceing successfully at home the hydrophilic polypropylene hollow fiber membrane; realize large-scale industrial production and successfully used the ultra filtration process; hydrophilic PP membrane micropore is evenly distributed; porosity is big; water flux is big; nonpoisonous and tasteless; acid and alkali-resistance; anti-bacterial corrosion; anti-high temperature more than 100 ℃; the surface is nonpolar; there is not any suction-operated; specific area is big; volume is little after becoming device; it is deserved to be called a kind of product of update as the milipore filter device, and (preparation cost is low; adopt conventional melt spinning method technology; by common plastics; need not add any additives or solvent promptly can be made into, pass through hydrophilicity-imparting treatment again, just can be used for the hyperfiltration film of water treatment).The PP hollow membrane has high intensity, adopts PP doughnut membrane type ultrafiltration cleaning equipment, can be widely used in the separation of material, concentrated and purification.As mineral water, the aseptic filtration of industry such as drinks, medicine, food material; The terminal ultrafiltration of space water, the ultrapure engineering of water treatment of electronics industry; Medication chemistry, food, brewage etc. industrial products separation, concentrate; The purification of industrial wastewater and the recovery of material.The PP film is used for also not producing when ethanolic solution (drinks) filters swelling effect, but also there is some defective in the PP film: this kind material is difficult to make＜and the film of 0.2 μ m micropore, so when doing the vinosity treatment facility, there is not aging effect, and by its surface micropore decision, though filter back wine normal temperature does not precipitate, do still having the floccule precipitation after cooling is handled, filter back wine liquid light transmittance is not very good yet.Do end-filtration (equipment) after the ozone devices and handle and be used in to be contained in equally in the water treatment, so also restricted its range of application and development.
By Given this, the objective of the invention is at above-mentioned deficiency, thereby a kind of polysulfone hollow fiber ultrafiltration membrane system of trendy solvent-resisting is provided, it is bigger to make it to have the molecular cut off scope, the effect that range of application is also wider.
The present invention realizes with following technical scheme: this hollow fiber ultrafiltration membrane group (device) part mainly is to make (adopting conventional solution spinning process preparation) by pvdf membrane (being PVDF membrane), during preparation, the constituent raw material mainly comprises in its prescription: PVDF, strong organic solvent and inorganic salts (can be selected monovalence or divalent salts for use, as potassium chloride or magnesium sulfate), the ratio of each parts by weight of raw materials of constituent is: PVDF: strong organic solvent: inorganic salts=15～30: 60～80: 6.5～9.5.(annotate: the PVDF molecular formula is:
Below in conjunction with embodiment the present invention is described in further detail.
The present invention is when concrete preparation, and the strong organic solvent that is used to transfer micropore to use is made up of dimethylacetylamide and dimethyl formamide again, and the ratio of weight portion between the two is: dimethylacetylamide: dimethyl formic acid acid amides=20～40: 60～80.
In addition, the present invention also is added with an amount of modifier that makes pvdf membrane have the hydrophiling performance and (annotates: the poly ethyldiol modified agent material that available routine is used) in preparation process.
Below be a kind of concrete processing instance of the present invention: get 20 parts of PVDF (polyvinylidene fluoride) raw materials by formulation weight part, 70 parts of the strong organic solvents (wherein dimethylacetylamide is 40: 60 with the ratio of dimethyl formamide weight portion between the two) of transferring micropore to use, about 8 parts in inorganic salts potassium chloride (working the pore-foaming agent that quickens gelatification uses), and add an amount of modifier (adopting conventional hydrophilic high molecular polymer polyethylene glycol) that hydrophiling is used that rises again, adopt conventional membrane equipment and solution spinning to be prepared.In the processing and preparing process, as long as adjust content, the molecular weight of inorganic salts pore-foaming agent, can adjust the aperture film of 0.2 μ m micropore (can make＜) of membrane micropore, realize various film separation processes so that be used in different fields.
The present invention adopts the PVDF material as hydrophiling solvent-resisting hollow fiber ultrafiltration membrane group (device) part can compare favourably with hydrophiling polypropylene hollow fiber milipore filter, can be widely used in The separation of the various materials of liquid one solid, liquid, one liquid, concentrated and purification, it not only has separating ranges Extensively (the molecular cut off scope is bigger), membrane separation device is simple, easy operation control, purifies the worker Skill is simple, safeguards easily, and the separative efficiency high, and in water treatment facilities, also can be contained in Do end-filtration after the ozone devices, do various organic solvents reclaim and do urging of various wine old go turbid The tip device use that anti-precipitation is namely done the vinosity processing (can increase substantially the grade of alcohol product Class).
Claims (3)
1, a kind of solvent-resisting polysulfone hollow fiber ultrafiltration membrane system is characterized in that this polysulfone hollow fiber ultrafiltration membrane system mainly is to be made by pvdf membrane (being PVDF membrane) that (its molecule is
, during preparation, the constituent raw material mainly comprises in its prescription: PVDF, strong organic solvent and inorganic salts, the ratio of each parts by weight of raw materials of constituent is: PVDF: strong organic solvent: inorganic salts=15～30: 60～80: 6.5～9.5.
2, solvent-resisting polysulfone hollow fiber ultrafiltration membrane system according to claim 1, it is characterized in that described strong organic solvent is made up of dimethylacetylamide and dimethyl formamide, the ratio of weight portion between the two is: dimethylacetylamide: dimethyl formamide=20～40: 60～80.
3, solvent-resisting polysulfone hollow fiber ultrafiltration membrane system according to claim 1 is characterized in that also being added with an amount of pvdf membrane that makes and has the modifier of hydrophiling performance in preparation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96116260 CN1157185A (en) | 1996-02-15 | 1996-02-15 | Solvent-resisting hollow fibre ultrafiltration membrane module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96116260 CN1157185A (en) | 1996-02-15 | 1996-02-15 | Solvent-resisting hollow fibre ultrafiltration membrane module |
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| Publication Number | Publication Date |
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| CN1157185A true CN1157185A (en) | 1997-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 96116260 Pending CN1157185A (en) | 1996-02-15 | 1996-02-15 | Solvent-resisting hollow fibre ultrafiltration membrane module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100450598C (en) * | 2007-03-06 | 2009-01-14 | 天津大学 | Method for preparing PVDF super-fine fiber film with good mechanics-performance |
| CN101053784B (en) * | 2007-02-05 | 2010-04-14 | 哈尔滨工业大学 | Polymetafluoroethylene/organic clay nanometer composite ultra-low pressure ultrafiltering membrane |
| CN114653229A (en) * | 2022-03-17 | 2022-06-24 | 福州福龙膜科技开发有限公司 | Preparation method of PVDF hydrophilic membrane |
-
1996
- 1996-02-15 CN CN 96116260 patent/CN1157185A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053784B (en) * | 2007-02-05 | 2010-04-14 | 哈尔滨工业大学 | Polymetafluoroethylene/organic clay nanometer composite ultra-low pressure ultrafiltering membrane |
| CN100450598C (en) * | 2007-03-06 | 2009-01-14 | 天津大学 | Method for preparing PVDF super-fine fiber film with good mechanics-performance |
| CN114653229A (en) * | 2022-03-17 | 2022-06-24 | 福州福龙膜科技开发有限公司 | Preparation method of PVDF hydrophilic membrane |
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