CN102872733A - High-desalinization rate aromatic polyamide compound nanofiltration membrane and manufacturing method thereof - Google Patents
High-desalinization rate aromatic polyamide compound nanofiltration membrane and manufacturing method thereof Download PDFInfo
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- CN102872733A CN102872733A CN2012104058869A CN201210405886A CN102872733A CN 102872733 A CN102872733 A CN 102872733A CN 2012104058869 A CN2012104058869 A CN 2012104058869A CN 201210405886 A CN201210405886 A CN 201210405886A CN 102872733 A CN102872733 A CN 102872733A
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Abstract
The invention discloses a high-desalinization rate aromatic polyamide compound nanofiltration membrane, which is prepared from raw materials in weight ratio by means of a manufacturing method for the high-desalinization rate aromatic polyamide compound nanofiltration membrane, wherein raw materials refer to 93.90-94.40 percent of non-woven fabric, 4.00-4.50 percent of dimethylformamide, 0.60-1.10 percent of polysulfone, 0.50-1.00 percent of piperazine, 0.02 percent of m-phenylenediamine and 0.03 percent of trimesic formamide. The desalinization rate is high.
Description
Technical field
The present invention relates to a kind of NF membrane and manufacture method thereof, relate in particular to a kind of equipment with high desalinization aromatic polyamides composite nanofiltration membrane and manufacture method thereof.
Background technology
Nanofiltration (NF, Nanofiltration), it is a kind of new membrane isolation technics that grows up phase late 1980s, nanofiltration equally belongs to the pressure drive membrane separation process with counter-infiltration, it is by the promotion of outside energy or chemical potential difference, and the osmosis by film realizes two components or multicomponent mist or liquid separates, classification, purification and enrichment.The aperture, top layer of NF membrane is in the nanoscale scope, and rejection is about 1nm greater than 90% smallest molecule diameter in process of osmosis, therefore is referred to as NF membrane.Nanofiltration is because low, the cost of investment of operating pressure and easy to operate, the advantage such as maintenance cost is relatively low, has been widely used in recent years removing and the fields such as concentrated, the organic classification of different molecular weight and concentrated, waste water decoloring at water softening, small organic molecule.
Generally by the top layer of playing centrifugation and the compound diffusion barrier that passive bottom forms, the compactness extent of its mesexine is the key that affects membrane separating property to NF membrane.At present, the preparation method of NF membrane mainly contains phase inversion, interfacial polymerization, surperficial cladding process and chemic modified method etc.The commercialization NF membrane mainly contains cellulose acetate class, polyamide-based and sulfonated polyether sulfone class etc., and these films are generally 20%～50% to the rejection of monovalence inorganic salts, is about 90% to the rejection of divalence and above valence state inorganic salts thereof.
And in separation process of nanofiltration membrane, the effect of desalination is particularly important, and for this reason, the NF membrane of seeking equipment with high desalinization is the target that pursue for a long time this area.
Summary of the invention
Problem for prior art exists the object of the invention is to propose a kind of equipment with high desalinization aromatic polyamides composite nanofiltration membrane and manufacture method thereof.
A kind of equipment with high desalinization aromatic polyamides composite nanofiltration membrane provided by the invention is prepared from by the raw material by following mass ratio:
Nonwoven, 93.90%～94.40%;
Dimethyl formamide, 4.00%～4.50%;
Polysulfones, 0.60%～1.10%;
Piperazine, 0.50%～1.00%;
M-phenylene diamine (MPD), 0.02%;
The benzene trimethamide, 0.03%.
Preferably, the main component of described nonwoven is PET.
In the manufacture method of a kind of equipment with high desalinization aromatic polyamides composite nanofiltration membrane provided by the invention, following raw material is pressed following mass ratio: nonwoven, 93.90%～94.40%; Dimethyl formamide, 4.00%～4.50%; Polysulfones, 0.60%～1.10%; Piperazine, 0.50%～1.00%; M-phenylene diamine (MPD), 0.02%; The benzene trimethamide, 0.03%, the manufacture method of described equipment with high desalinization aromatic polyamides composite nanofiltration membrane may further comprise the steps:
(a) provide by described polysulfones and the outer formulated casting solution of doping of described dimethyl formamide;
(b) in film-casting machine, described casting solution is coated on makes the polysulfones ultrafiltration membranes on the described nonwoven, described nonwoven and described polysulfones ultrafiltration membranes are compounded to form the support counterdie;
(c) clean (b) step products;
(d) in film applicator, described piperazine, described m-phenylene diamine (MPD) and described benzene trimethamide are coated on generation interfacial polymerization chemical reaction on the described support counterdie surface, and generate the aromatic polyamides composite membrane: described nonwoven, described polysulfones ultrafiltration membranes and described aromatic polyamides composite membrane are compounded to form described equipment with high desalinization aromatic polyamides composite nanofiltration membrane;
(e) clean and dry (d) step products.
Based on disclosing of above technical scheme, the present invention possesses following beneficial effect:
In the present invention, described equipment with high desalinization aromatic polyamides composite nanofiltration membrane is respectively the raw material of 93.90%～94.40% nonwoven, 4.00%～4.50% dimethyl formamide, 0.60%～1.10% polysulfones, 0.50%～1.00% piperazine, 0.02% m-phenylene diamine (MPD), 0.03% benzene trimethamide by mass ratio, by the preparation of the manufacture method of described equipment with high desalinization aromatic polyamides composite nanofiltration membrane provided by the invention and get the salt rejection rate height.
Description of drawings
Fig. 1 is the flow chart of the manufacture method of equipment with high desalinization aromatic polyamides composite nanofiltration membrane provided by the invention.
The specific embodiment
For the deficiencies in the prior art, the invention provides a kind of equipment with high desalinization aromatic polyamides composite nanofiltration membrane.
See also Fig. 1, in the manufacture method of a kind of equipment with high desalinization aromatic polyamides composite nanofiltration membrane provided by the invention, following raw material is pressed following mass ratio: nonwoven, 93.90%～94.40%; Dimethyl formamide, 4.00%～4.50%; Polysulfones, 0.60%～1.10%; Piperazine, 0.50%～1.00%; M-phenylene diamine (MPD), 0.02%; The benzene trimethamide, 0.03%, the manufacture method of described equipment with high desalinization aromatic polyamides composite nanofiltration membrane may further comprise the steps:
(a) provide casting solution: provide by described polysulfones, the outer formulated casting solution of doping of described dimethyl formamide, wherein, described additive can be polyvinyl alcohol, methyl cellosolve, polyacrylic acid, carboxymethyl cellulose, aldehyde, phenol, acid anhydrides, carboxylic acid etc., described dimethyl formamide is as solvent, and described polysulfones is solute.
(b) casting film in film-casting machine: in film-casting machine, described casting solution is coated on makes the polysulfones ultrafiltration membranes on the described nonwoven, described nonwoven and described polysulfones ultrafiltration membranes are compounded to form the support counterdie: wherein, the main component of described nonwoven is PET;
(c) clean: cleaning step (b) product;
(d) in film applicator, film: in film applicator, described piperazine, described m-phenylene diamine (MPD) and described benzene trimethamide are coated on generation interfacial polymerization chemical reaction on the described support counterdie surface, and generate the aromatic polyamides composite membrane: described nonwoven, described polysulfones ultrafiltration membranes and described aromatic polyamides composite membrane are compounded to form described equipment with high desalinization aromatic polyamides composite nanofiltration membrane;
(e) clean and dry: clean and baking step (d) product.
Wherein, in the manufacture method of above-mentioned equipment with high desalinization aromatic polyamides composite nanofiltration membrane, described equipment with high desalinization aromatic polyamides composite nanofiltration membrane forms by three layers and is specially nonwoven layer, polysulfones ultrafiltration membranes and aromatic polyamides composite membrane, wherein, described polysulfones ultrafiltration membranes is to be formed in described nonwoven layer in described film-casting machine by described casting solution, and described polysulfones ultrafiltration membranes and described nonwoven layer form the support counterdie jointly.
A kind of equipment with high desalinization aromatic polyamides composite nanofiltration membrane provided by the invention is prepared from by the raw material by following part by weight:
Nonwoven, 93.90%～94.40%;
Dimethyl formamide, 4.00%～4.50%;
Polysulfones, 0.60%～1.10%;
Piperazine, 0.50%～1.00%;
M-phenylene diamine (MPD), 0.02%;
The benzene trimethamide, 0.03%.
Below introduce the salt rejection rate test of described equipment with high desalinization aromatic polyamides composite nanofiltration membrane:
1) the MgSO4 salt rejection rate of No. 1 equipment with high desalinization aromatic polyamides composite nanofiltration membrane (NF1) is 98%, and the salt rejection rate error is not more than 2%, is 70% to the salt rejection rate of NaCl, and the error amount of salt rejection rate all is not more than 10%(and is in the internationally recognized scope).The water yield per day of its 8040 specification product is 34 tons (9000gpd), and the error of single membrane component aquifer yield is no more than 15% of setting, and the salt rejection rate of single element (MgSO4) is minimum to be not less than 93%.
2) the MgSO4 salt rejection rate of No. 2 equipment with high desalinization aromatic polyamides composite nanofiltration membranes (NF2) is 96%, and the salt rejection rate error is not more than 2%, is 65% to the salt rejection rate of NaCl, and the error amount of salt rejection rate is not more than 10%(and is in the internationally recognized scope).The water yield per day of its 8040 specification product is 36 tons (9529gpd), and the error of single membrane component aquifer yield is no more than 15% of setting, and the salt rejection rate of single element (MgSO4) is minimum to be not less than 93%.
More than the test condition of two kinds of equipment with high desalinization aromatic polyamides composite nanofiltration membranes as follows:
The test condition of NaCl salt rejection rate: 500ppm NaCl solution (SDI15＜2), 70psi, 25 ° of C, pH 7.5～8, and 15% rate of recovery, the test data of element are to obtain under element stable operation.
The test condition of MgSO4 salt rejection rate: 2000ppmMgSO4 solution (SDI15＜2), 70psi, 25 ° of C, pH 7.5～8, and 15% rate of recovery, the test data of element are to obtain under element stable operation.
Salt rejection rate by equipment with high desalinization aromatic polyamides composite nanofiltration membrane described above is tested as can be known, by the raw material by following part by weight, and by the preparation of the manufacture method of described equipment with high desalinization aromatic polyamides composite nanofiltration membrane provided by the invention and the salt rejection rate of described equipment with high desalinization aromatic polyamides composite nanofiltration membrane high, described each raw material weight proportioning is specific as follows: 93.90%～94.40% nonwoven, 4.00%～4.50% dimethyl formamide, 0.60%～1.10% polysulfones, 0.50%～1.00% piperazine, 0.02% m-phenylene diamine (MPD), 0.03% benzene trimethamide.
The above has carried out exemplary description to the present invention; obvious realization of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the method design of invention and the various improvement that technical scheme is carried out; or directly apply to other occasion without improving the design that will invent and technical scheme, all in protection scope of the present invention.
Claims (3)
1. an equipment with high desalinization aromatic polyamides composite nanofiltration membrane is characterized in that, is prepared from by the raw material by following mass ratio:
Nonwoven, 93.90%～94.40%;
Dimethyl formamide, 4.00%～4.50%;
Polysulfones, 0.60%～1.10%;
Piperazine, 0.50%～1.00%;
M-phenylene diamine (MPD), 0.02%;
The benzene trimethamide, 0.03%.
2. equipment with high desalinization aromatic polyamides composite nanofiltration membrane according to claim 1 is characterized in that, the main component of described nonwoven is PET.
3. the manufacture method of an equipment with high desalinization aromatic polyamides composite nanofiltration membrane is characterized in that, following raw material is by mass ratio claimed in claim 1, and it may further comprise the steps:
(a) provide by described polysulfones and the outer formulated casting solution of doping of described dimethyl formamide;
(b) in film-casting machine, described casting solution is coated on makes the polysulfones ultrafiltration membranes on the described nonwoven, described nonwoven and described polysulfones ultrafiltration membranes are compounded to form the support counterdie;
(c) clean (b) step products;
(d) in film applicator, described piperazine, described m-phenylene diamine (MPD) and described benzene trimethamide are coated on generation interfacial polymerization chemical reaction on the described support counterdie surface, generate the aromatic polyamides composite membrane;
(e) clean also baking step (d) product.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240005A (en) * | 2013-04-28 | 2013-08-14 | 泉州索爱膜科技开发有限公司 | Tubular composite nanofiltration membrane and preparation method thereof |
| CN103252178A (en) * | 2013-05-31 | 2013-08-21 | 杭州水处理技术研究开发中心有限公司 | Method for improving ion rejection rate of charged nano-filtration membrane |
| CN105597574A (en) * | 2016-02-03 | 2016-05-25 | 东华大学 | Preparation method of composite positive osmosis membrane |
| CN110270235A (en) * | 2019-05-06 | 2019-09-24 | 埃姆媞（无锡）分离技术有限公司 | The composite nanometer filtering film that a kind of pair of monovalence, divalent salts efficiently separate |
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| CN101732998A (en) * | 2010-01-25 | 2010-06-16 | 杭州水处理技术研究开发中心有限公司 | Preparation method for cross-linking polyvinyl alcohol furfural nanofiltration membrane |
| CN102716681A (en) * | 2012-06-01 | 2012-10-10 | 森泰环保（湖南）科技有限公司 | Reverse osmosis membrane and manufacturing method for reverse osmosis membrane |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101732998A (en) * | 2010-01-25 | 2010-06-16 | 杭州水处理技术研究开发中心有限公司 | Preparation method for cross-linking polyvinyl alcohol furfural nanofiltration membrane |
| CN102716681A (en) * | 2012-06-01 | 2012-10-10 | 森泰环保（湖南）科技有限公司 | Reverse osmosis membrane and manufacturing method for reverse osmosis membrane |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240005A (en) * | 2013-04-28 | 2013-08-14 | 泉州索爱膜科技开发有限公司 | Tubular composite nanofiltration membrane and preparation method thereof |
| CN103240005B (en) * | 2013-04-28 | 2015-03-25 | 泉州索爱膜科技开发有限公司 | Tubular composite nanofiltration membrane and preparation method thereof |
| CN103252178A (en) * | 2013-05-31 | 2013-08-21 | 杭州水处理技术研究开发中心有限公司 | Method for improving ion rejection rate of charged nano-filtration membrane |
| CN105597574A (en) * | 2016-02-03 | 2016-05-25 | 东华大学 | Preparation method of composite positive osmosis membrane |
| CN105597574B (en) * | 2016-02-03 | 2018-02-23 | 东华大学 | A kind of preparation method of compound forward osmosis membrane |
| CN110270235A (en) * | 2019-05-06 | 2019-09-24 | 埃姆媞（无锡）分离技术有限公司 | The composite nanometer filtering film that a kind of pair of monovalence, divalent salts efficiently separate |
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Application publication date: 20130116 |