CN108939937A - A kind of method of polyvinyl alcohol hydrogel enhancing membrane distillation flux system - Google Patents
A kind of method of polyvinyl alcohol hydrogel enhancing membrane distillation flux system Download PDFInfo
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- CN108939937A CN108939937A CN201811057891.9A CN201811057891A CN108939937A CN 108939937 A CN108939937 A CN 108939937A CN 201811057891 A CN201811057891 A CN 201811057891A CN 108939937 A CN108939937 A CN 108939937A
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- Prior art keywords
- membrane distillation
- membrane
- polyvinyl alcohol
- hydrogel
- alcohol hydrogel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
- B01D61/364—Membrane distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/22—Thermal or heat-resistance properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/30—Chemical resistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/38—Hydrophobic membranes
Abstract
The present invention provides a kind of methods of polyvinyl alcohol hydrogel enhancing membrane distillation flux system, are related to membrane distillation separation technology field.Specifically, this method covers layer of polyethylene alcohol hydrogel by hydrophobic membrane, lowers the evaporation latent heat of feed liquid in membrane distillation system, enhances the evaporation capacity of feed liquid, and then improve the flux of membrane distillation system.
Description
Technical field
The present invention relates to membrane distillation separation technology fields.More specifically, the present invention relates to for increasing in membrane distillation field
Hydrophobicity/hydrophilic complex film applications of strong membrane flux.
Background technique
Membrane distillation belongs to a kind of thermal distillation technology, drives substance to separate using thermal evaporation process, is now widely used for
And be not limited to water desalination, water devolatility organic matter and food processing etc..
In membrane distillation, it will generally be separated using porous hydrophobic film and separated object matter separate, the evaporation of heating one end
And then realize the separation of substance.Compared with other desalinating process, membrane distillation can be run at a lower temperature, for nonvolatile matter
Matter has 100% selectivity, is capable of handling the waste brine solution of high concentration, or even directly salt can be made to crystallize.Membrane distillation at present
The difficulty faced is that the flux of film is lower, and weatherability is poor, and then limits its application in commercialization.
The membrane distillation research come in mainly changes structure, the film thickness of film from film by changing the preparation method of film
And how hydrophilic and hydrophobic, research increase the flux and weatherability of film.Its principle is mainly to reduce the thermal conductivity of film and lead to
It crosses change structure and increases membrane flux.
Summary of the invention
For the demand that film distillation technology enhances flux, the present invention proposes a kind of method for enhancing flux of membrane distillation, can
To be combined with existing membrane distillation equipment；It in the hydrophobic membrane of feed liquid one end mainly by modifying layer of polyethylene alcohol water-setting
Glue is realized.
When it is this load have the hydrophobic membrane of polyvinyl alcohol hydrogel for membrane distillation system when, polyvinyl alcohol hydrogel with to
Evaporation solution directly contacts.For water from when polyvinyl alcohol hydrogel surface evaporation, partial moisture leaves water-setting in a manner of cluster
The evaporation latent heat on glue surface, water reduces, and additional issue amount increases, and then increases flux system.Meanwhile hydrogel completely cut off hydrophobic membrane with
The contact of water can be avoided pollution of some oils organic matters to hydrophobic membrane in water, and then the weatherability of the seperation film enhanced.
Hydrophobic membrane and the specific operation process of the compound film preparation of polyvinyl alcohol hydrogel are as follows:
(1) it configures polyvinyl alcohol water solution: being that 5-25% is dissolved polyvinyl alcohol in water according to mass fraction；
(2) poly-vinyl alcohol solution is coated in hydrophobic film surface, and makes water-setting adhesive curing.
The usage mode of composite membrane: when by above-mentioned composite membrane be applied to membrane distillation when, by hydrogel side with it is to be evaporated molten
Liquid contact.
Preferably, above-mentioned curing method can be to be added crosslinking agent, such as aldehydes, boric acid, epoxy in poly-vinyl alcohol solution
Chloropropane, the heavy metallic salt that gel can be formed by ligand complex with polyvinyl alcohol；It can also be made by freezing or radiating repeatedly
It is polyvinyl alcohol crosslinked；Or the method that combination is chemically and physically crosslinked.
Preferably, hydrophobic membrane can be intrinsic hydrophobic high molecular material, such as polyvinylidene fluoride, polypropylene, polytetrafluoro
Ethylene, it is poly- (vinylidene fluoride-copolymerization-hexafluoropropene)；Or the hydrophilic film of surface-modified molecules such as fluorine modification, Huo Zhewei
The composite membrane of intrinsic hydrophobic material and water wetted material.
Preferably, above-mentioned hydrophobic membrane is not limited to structure and is not limited to film, can also be pipe structure.
Preferably, above-mentioned coating method can be blade coating, spin coating, or prolong stream naturally.
Preferably, membrane distillation system can be direct contact membranes Distallation systm, can be air-gap membrane distillation system, can be with
For pressure reducing film distillation system, membrane distillation system can be swept for gas, can for absorb membrane distillation (Osmotic distillation,
OMD) system.
Preferably, the feed liquid of above-mentioned membrane distillation system can be water/salting liquid, or water/organic matter mixed solution.
Beneficial effects of the present invention: (1) most of existing membrane distillation systems are can be applied to.Hydrogel can reduce water evaporation
One to four times of latent heat, after hydrophobic film surface covers hydrogel, for membrane distillation system compared with original system, flux can be improved one
To four times.(2) due to the reduction of hydrogel surface evaporation latent heat, it is possible to reduce the series or unnecessary of recovery of latent heat equipment
It is equipped using recovery of latent heat.(3) hydrogel can protect hydrophobic membrane from contacting the organic matters such as the oil in feed liquid, Jin Erti simultaneously
The weatherability of high hydrophobic membrane.
Detailed description of the invention
Attached drawing 1 is hydrogel and the compound rear sectional view for film unit in membrane distillation system of hydrophobic membrane in embodiment.1,
Hydrophobic membrane；2, hydrogel；3, material liquid tank；4, condensation chamber.The film unit itself can be planar film, or tubular film.
Attached drawing 2 is the schematic diagram that the polyvinyl alcohol hydrogel that mass fraction is 10% in embodiment enhances water evaporation, corresponding
Measuring temperature is 26oC, relative humidity 60%.
Specific embodiment
In order to make the purpose of the present invention, technical solution and advantage are more clearly understood, below in conjunction with attached drawing and case study on implementation,
The present invention is described in more detail；It should be understood that particular embodiments described herein is only used to explain the present invention, and do not have to
It is of the invention in limiting.
Embodiment 1, load have polyvinylidene fluoride (PVDF) film of polyvinyl alcohol (PVA) hydrogel to fill for membrane distillation
It sets:
(1) the hydrophobic film preparation of PVDF: 1.5 g PVDF are dissolved in 8.5 g DMF, are stirred overnight；On glass slide blade coating at
150 μm of thick films；Immerse 20oIn C anti-solvent water, 2h；Again duck in drink 24 h, is finally cleaned with ethyl alcohol；60oC's
Dry 24 h in baking oven；
(2) preparation of polyvinyl alcohol hydrogel mother liquor: 1g is added in 10 mL water by taking 10 wt% as an example in configuration PVA solution first
PVA, after heating for dissolving, it is 1.2 mol/L that glutaraldehyde that 250 μ L mass fractions are 25% and 50 μ L substance withdrawl syndromes, which is added,
Hydrochloric acid；
(3) modification of the hydrogel to hydrophobic membrane: above-mentioned configured PVA solution is coated in the one side of PVDF, with a thickness of 200 μ
M is sealed static so that PVA water-setting adhesive curing, can obtain the good composite membrane of caking property；
(4) above-mentioned composite membrane is applied in distillation device unit as shown in Fig. 1, wherein hydrogel directly connects with feeding liquid
Touching.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within the scope of the present invention.
Claims (2)
1. a kind of method of polyvinyl alcohol hydrogel enhancing membrane distillation flux system, which is characterized in that dredged in membrane distillation system
The one side of moisture film carries out function sex modification, covers layer of polyethylene alcohol hydrogel.
2. in a kind of method of polyvinyl alcohol hydrogel enhancing membrane distillation flux system as described in right 1, which is characterized in that will
When hydrophobic membrane after modification is used in membrane distillation system, the hydrogel being supported in hydrophobic membrane is contacted with solution to be evaporated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811057891.9A CN108939937A (en) | 2018-09-11 | 2018-09-11 | A kind of method of polyvinyl alcohol hydrogel enhancing membrane distillation flux system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811057891.9A CN108939937A (en) | 2018-09-11 | 2018-09-11 | A kind of method of polyvinyl alcohol hydrogel enhancing membrane distillation flux system |
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| CN108939937A true CN108939937A (en) | 2018-12-07 |
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| CN201811057891.9A Pending CN108939937A (en) | 2018-09-11 | 2018-09-11 | A kind of method of polyvinyl alcohol hydrogel enhancing membrane distillation flux system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666245A (en) * | 2020-12-18 | 2021-04-16 | 中国科学院地球环境研究所 | Preparation method of ammonium nitrogen adsorption bag in natural water and detection method of isotope thereof |
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| CN1276262A (en) * | 1999-06-08 | 2000-12-13 | 中国科学院生态环境研究中心 | Process and special equipment for preparing anti-pollution compound plyvinyl alcohol film |
| CN1459326A (en) * | 2002-05-24 | 2003-12-03 | 中国科学院化学研究所 | Method for prepn. of high flux polyvinyl alcohol permeation vaporization film |
| CN1978036A (en) * | 2005-12-06 | 2007-06-13 | 浙江工商大学 | Method for preparing polyuinyl alcohol/polyamide |
| CN103446898A (en) * | 2013-09-13 | 2013-12-18 | 天津工业大学 | Alginate-base organic-inorganic composite hydrogel filtering membrane and preparation method thereof |
| CN104841279A (en) * | 2015-05-15 | 2015-08-19 | 山西大学 | Method and device for low-temperature membrane distillation by using heat-sensitive hydrogel as absorbing agent |
| CN105080354A (en) * | 2014-05-09 | 2015-11-25 | 财团法人纺织产业综合研究所 | composite membrane for membrane distillation |
| CN105214519A (en) * | 2015-10-27 | 2016-01-06 | 北京碧水源膜科技有限公司 | The preparation method of polyvinyl alcohol composite nanometer filtering film |
| CN106000117A (en) * | 2016-05-24 | 2016-10-12 | 华南理工大学 | Low thermal conductivity hydrophilic-hydrophobic bipolar composite membrane as well as preparation method and application thereof |
| CN205914032U (en) * | 2016-06-22 | 2017-02-01 | 湖南万净环保科技有限公司 | Little nanofiltration membrane |
| CN106621841A (en) * | 2016-12-30 | 2017-05-10 | 北京碧水源膜科技有限公司 | Preparation method of positively charged nanofiltration membrane |
-
2018
- 2018-09-11 CN CN201811057891.9A patent/CN108939937A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276262A (en) * | 1999-06-08 | 2000-12-13 | 中国科学院生态环境研究中心 | Process and special equipment for preparing anti-pollution compound plyvinyl alcohol film |
| CN1459326A (en) * | 2002-05-24 | 2003-12-03 | 中国科学院化学研究所 | Method for prepn. of high flux polyvinyl alcohol permeation vaporization film |
| CN1978036A (en) * | 2005-12-06 | 2007-06-13 | 浙江工商大学 | Method for preparing polyuinyl alcohol/polyamide |
| CN103446898A (en) * | 2013-09-13 | 2013-12-18 | 天津工业大学 | Alginate-base organic-inorganic composite hydrogel filtering membrane and preparation method thereof |
| CN105080354A (en) * | 2014-05-09 | 2015-11-25 | 财团法人纺织产业综合研究所 | composite membrane for membrane distillation |
| CN104841279A (en) * | 2015-05-15 | 2015-08-19 | 山西大学 | Method and device for low-temperature membrane distillation by using heat-sensitive hydrogel as absorbing agent |
| CN105214519A (en) * | 2015-10-27 | 2016-01-06 | 北京碧水源膜科技有限公司 | The preparation method of polyvinyl alcohol composite nanometer filtering film |
| CN106000117A (en) * | 2016-05-24 | 2016-10-12 | 华南理工大学 | Low thermal conductivity hydrophilic-hydrophobic bipolar composite membrane as well as preparation method and application thereof |
| CN205914032U (en) * | 2016-06-22 | 2017-02-01 | 湖南万净环保科技有限公司 | Little nanofiltration membrane |
| CN106621841A (en) * | 2016-12-30 | 2017-05-10 | 北京碧水源膜科技有限公司 | Preparation method of positively charged nanofiltration membrane |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666245A (en) * | 2020-12-18 | 2021-04-16 | 中国科学院地球环境研究所 | Preparation method of ammonium nitrogen adsorption bag in natural water and detection method of isotope thereof |
| CN112666245B (en) * | 2020-12-18 | 2024-01-09 | 中国科学院地球环境研究所 | Preparation method of ammonium nitrogen adsorption package in natural water and detection method of isotopes thereof |
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Application publication date: 20181207 |