CN1122641C - Hydrophilic penetrating and evaporating film for desalting sea water - Google Patents
Hydrophilic penetrating and evaporating film for desalting sea water Download PDFInfo
- Publication number
- CN1122641C CN1122641C CN00113269A CN00113269A CN1122641C CN 1122641 C CN1122641 C CN 1122641C CN 00113269 A CN00113269 A CN 00113269A CN 00113269 A CN00113269 A CN 00113269A CN 1122641 C CN1122641 C CN 1122641C
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- CN
- China
- Prior art keywords
- film
- water
- hydrophilic
- penetrating
- freshwater
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention discloses a hydrophilic penetrating and evaporating film for desalting sea water. A film forming feed solution adopts hydrophilic film substrate. When the temperature of salt water is from 50 DEG C to 70 DEG C, the vacuum degree of a freshwater collecting side is from 5 to 10KPa and ice water with the temperature of 3 DEG C to 25 DEG C or flowing tap water is used, the flux of the penetrating and evaporating film is more than 10 to 20 Kg/m, and the primary separation rate is greater than 99% (or the electric conductivity of freshwater is less than 100 mu s/cm). When the concentration of an NaCl solution is improved to 8%, the film still has unchanged performance. The present invention can be made into an independent film as well as a composite film, and can be made into desalting film separating devices in different forms as required. The present invention can utilize natural heat sources and manual power in various forms to prepare the freshwater without the need of adopting electric power so as to be adapted to the emergency of special environment.
Description
Technical field: the present invention relates to hydrophilic penetrating and evaporating film for desalting sea water.
Background technology: in the sea water desalination method, traditional direct distillation is low because of energy utilization rate, device is complicated, floor space is big, have problem such as heat exchanger surface fouling, replaced by membrane separation process gradually.More sophisticated in the embrane method have reverse osmosis and an electrodialytic technique.But the former needs high pressure, has the stability problem of film, and to the equipment requirements height, water pretreatment expense height often need carry out multistage desalination and handle.The latter then consumes a large amount of electric energy, the equipment complexity, and be difficult to reach high separation.People combine hydrophilic film and vaporization and carry out the salt water sepn in recent years, and it can utilize low-temperature heat source and used heat, moves under negative pressure, and is simple to operate, is easy to amplify.This method is based on water molecules can see through swollen hydrophilic macromolecule network, do not need the physics hole, thereby this film is good to the selectivity of water molecules, long service life.But the water flux of this film of report is generally less both at home and abroad so far, is used for removing minor amount of water in organism and the biomolecules more, and is not successfully used to the report of sea water desalinization.
Summary of the invention: the object of the present invention is to provide big, the flash liberation degree height of a kind of flux, can enlarge pervaporation Application Areas and hydrophilic penetrating and evaporating film for desalting sea water with low cost.
Film forming feed liquid of the present invention adopts hydrophilic film matrix: (1) 2～14% polyvinyl alcohol water solution; (2) the 1-15% polyoxyethylene glycol aqueous solution and the 2-20% basic metal aqueous solution; (3) 2～15% acidic aqueous solution; (4) 1～30% C
1-C
5The aldehyde aqueous solution; (1): (2): (3): (4)=100: 15-150: 0.1-3.0: 0.1-2.
This osmotic evaporation film is 50～70 ℃ at brine temp, and it is 5-10KPa that fresh water is collected side vacuum tightness, and when temperature was 3～25 ℃ frozen water or mobile tap water, flux reached 10～20Kg/m
2More than the h, flash liberation degree＞99% (or fresh water specific conductivity＜100 μ s/cm).When the NaCl strength of solution brought up to 8%, film properties was still constant.When being used for sea water desaltination, only need to be equipped with simple pre-processing devices such as sand filtration.This polymeric membrane both can be made into independent film, also can be used as the isolating active layer and was coated in and makes composite membrane on the porous material, all can obtain above separation performance when adjusting corresponding technology, thereby can make multi-form desalination membrane separating device according to needs.When design during appropriate device, can utilize various forms of natural thermals source and man power to prepare fresh water and need not to adopt electric power, be badly in need of with unusual environment.Film properties of the present invention has been broken the little limitation of traditional hydrophilic penetrating and evaporating film water flux, expanded the practical application area of pervaporation membrane process, make the pervaporation membrane process be used for sea water desaltination, brackish water desalination, remove fields such as drinking-water harmful heavy metal ion, boiler of power plant moisturizing, also be expected to be used for blood plasma etc. and need to keep fields such as bioactive material dehydration and dehydration of organic solvent.
Embodiment:
Embodiment 1:
(1), claim 2g polyvinyl alcohol, add 98g distilled water, under 80 ℃ of constant temperatures, constantly stir, treat that PVA dissolves fully after, continue to stir 30min, add moisture content to original concentration, strainer filtering is removed insolubles.(2), in the time of 50 ℃, preparation contains the aqueous solution of the sodium-chlor of 10% polyoxyethylene glycol and 8.5%, behind the dissolving 30min, room temperature leave standstill 24 hours stand-by.(3), preparation contains 5% the sulfuric acid and nitric acid (volume ratio is 1: the 1) aqueous solution.(4), compound concentration is 2% glyoxal water solution.
With solution (1), (2), (3), (4) were in 100: 15: 2: 2 ratio reaction, when obtaining to suit viscosity, standing and defoaming promptly gets stand-by preparation liquid.
Knifing: the exsiccant plastics film is affixed on the moistening sheet glass, adjust to complete level after, the film liquid after the standing and defoaming scraped equably on plastic basis material, makes independent flat sheet membrane.
Film liquid drying: the wet film that coats is indoor at the system film, and with the infrared lamp irradiation, controlled temperature is 30～50 ℃, makes film liquid drying, crosslinked.
The application of film: prepared independent flat sheet membrane is peeled off from matrix carefully, and put to soak after 24 hours in the water and take out, it is close on the porous ceramics back up pad, on flat tripping device, implement the pervaporation demineralising process, behind the operation 50min, film properties is stable.
Separation condition is: 55 ℃ of brine temps, and it is 5KPa that fresh water is collected side vacuum tightness, temperature is 5 ℃ a frozen water.
Claims (1)
1, hydrophilic penetrating and evaporating film for desalting sea water is characterized in that the film forming feed liquid adopts hydrophilic film matrix:
(1) 2～14% polyvinyl alcohol water solution;
(2) the 1-15% polyoxyethylene glycol aqueous solution and the 2-20% basic metal aqueous solution;
(3) 2～15% acidic aqueous solution;
(4) 1～30% C
1-C
5The aldehyde aqueous solution;
Wherein (1): (2): (3): (4)=100: 15-150: 0.1-3.0: 0.1-2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00113269A CN1122641C (en) | 2000-02-02 | 2000-02-02 | Hydrophilic penetrating and evaporating film for desalting sea water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00113269A CN1122641C (en) | 2000-02-02 | 2000-02-02 | Hydrophilic penetrating and evaporating film for desalting sea water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1258646A CN1258646A (en) | 2000-07-05 |
| CN1122641C true CN1122641C (en) | 2003-10-01 |
Family
ID=4583071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00113269A Expired - Fee Related CN1122641C (en) | 2000-02-02 | 2000-02-02 | Hydrophilic penetrating and evaporating film for desalting sea water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1122641C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6383391B1 (en) * | 2000-07-28 | 2002-05-07 | Dais-Analytic Corporation | Water-and ion-conducting membranes and uses thereof |
| JP5151152B2 (en) * | 2006-03-29 | 2013-02-27 | 栗田工業株式会社 | Nanofiltration membrane or reverse osmosis membrane rejection rate improver, rejection rate improvement method, nanofiltration membrane or reverse osmosis membrane, water treatment method, and water treatment apparatus |
| US20180169589A1 (en) * | 2015-06-15 | 2018-06-21 | Dmac Ip Pty Ltd | Water treatment system and method |
| CN110479102A (en) * | 2019-09-03 | 2019-11-22 | 盐城海普润膜科技有限公司 | Pervaporation desalination anisotropic membrane and preparation method thereof |
-
2000
- 2000-02-02 CN CN00113269A patent/CN1122641C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1258646A (en) | 2000-07-05 |
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| CF01 | Termination of patent right due to non-payment of annual fee |