CN105617885A - Device and method for continuously preparing forward osmosis composite membrane - Google Patents
Device and method for continuously preparing forward osmosis composite membrane Download PDFInfo
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- CN105617885A CN105617885A CN201610176635.6A CN201610176635A CN105617885A CN 105617885 A CN105617885 A CN 105617885A CN 201610176635 A CN201610176635 A CN 201610176635A CN 105617885 A CN105617885 A CN 105617885A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
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- 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
- B01D67/0002—Organic membrane manufacture
- B01D67/0006—Organic membrane manufacture by chemical reactions
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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
- B01D69/12—Composite membranes; Ultra-thin membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
- B01D71/42—Polymers of nitriles, e.g. polyacrylonitrile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a device and a method for continuously preparing a forward osmosis composite membrane. Compared with an existing reported continuous preparation method, the method is high in operational reliability and good in repeatability, and can more effectively reduce the influence caused by an internal concentration polarization phenomenon and increase the water flux of the forward osmosis membrane. According to the method, the problem of permeation of a casting membrane solution into a supporting body in a continuous preparation process is solved in a double-sided membrane casting manner, and other supporting materials separated from the supporting body are not introduced, so that the device complexity is lowered and the operational reliability is improved.
Description
Technical field
The invention belongs to preparative separation film composite material field, it is specifically related to a kind of method of continuous production thin layer composite type forward osmosis membrane, namely by the high performance forward osmosis membrane of mode continuous production of two-sided casting film.
Background technology
Forward osmosis membrane process utilizes the permeable pressure head of semi-permeable membranes both sides for cross-film impellent, drives water by semi-permeable membranes, and other molecules or ion are efficiently retained. The process driving lower water molecules to pass through semi-permeable membranes due to osmotic pressure is spontaneous process, thus without the need to additional impellent and energy input, so that it may to realize being separated of water and pollutent. But different from traditional reverse osmosis membrane, forward osmosis membrane is while possessing selective penetrated property, and its supporting layer structure needs to be optimized the internal concentration polarization phenomenon reduced wherein. The supporting layer of high performance forward osmosis membrane should possess thinner thickness, higher porosity and lower hole tortuosity.
The forward osmosis membrane having These characteristics to obtain, in the preparation process of a support group film, it is necessary to adopts low density supporting layer, prepares the film-casting liquid of lower concentration simultaneously, and the cooperation of the two can cause film-casting liquid to infiltrate even through supporting layer, finally makes base film produce defect. In order to address this problem, US Patent No. 8181794B2 mentions and adopts two-layer nonwoven to prevent film-casting liquid seepage, international monopoly WO2014/071238A1 then adopts the dense film of polypropylene or polyethylene material prevent film-casting liquid seepage bottom supporting layer. But these two kinds of modes all introduce the base material outside supporting layer, in actually operating, the synchronous problem of the two is very high to equipment requirements, adds operation easier.
Summary of the invention
For above problem, technical problem to be solved by this invention is method and the equipment thereof of a kind of continuous production thin layer composite type forward osmosis membrane. The method is simple, effectively reduces the total thickness of the final forward osmosis membrane formed, weakens the internal concentration polarization phenomenon in supporting layer, it is to increase the permeation flux of forward osmosis membrane and efficiency.
A method for the compound forward osmosis membrane of continuous production, the method specifically comprises:
1) apply the first polymers soln in propping material first side, under coagulation bath environment, form the first polymer layer;
2) by step 1) propping material with the first polymer layer that formed dries, and forms the composite supporting layer with more high strength;
3) in described composite supporting layer, the 2nd side of the first polymer layer applies second layer polymers soln, forms the 2nd polymer layer under coagulation bath environment;
4) carry out interfacial polymerization on the 2nd surface, side of described 2nd polymer layer, form the desalination layer with crosslinking structure;
5) described first polymer layer is peeled off from composite structure, obtain forward osmosis membrane.
The introducing of propping material, it is possible to strengthen the physical strength of composite membrane, keeps planeness with mechanical tension force and the pyroprocessing born in continous way coating process. The key parameter of supporter mainly comprises thickness, weight per unit area and ventilative rate or order number. For non-woven fabric type supporter, further, the material of described non-woven fabrics includes but not limited to polyethylene terephthalate, polypropylene or polyethylene or its mixture; Further, described nonwoven thickness is not more than 50 ��m, and weight per unit area is less than 50g/m2, ventilative rate is greater than 100mL/cm2/ s; For woven type supporter, its thickness requirement requires between 5-50 ��m, and weight per unit area requires between 5-50g/m2, order number requires between 20-200 order.
Further, described first polymers soln is formulated by polymkeric substance, solvent, nonsolvent additive, wherein polymkeric substance massfraction in the solution is 5-45%, and the massfraction in the solution of solvent is 30-90%, and the massfraction in nonsolvent additive solution is 5-25%; Further, described polymkeric substance comprises: polyvinyl chloride, polyacrylonitrile, polysulfones, polyethersulfone, polyimide, polyetherimide, polymeric amide or wherein two or more mixture; Described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N-Methyl pyrrolidone, dimethyl sulfoxide (DMSO) etc. or wherein two or more mixture; Described nonsolvent additive, comprising: methyl alcohol, ethanol, ethylene glycol, propylene glycol, glycerol, polyoxyethylene glycol, acetone, polyvinylpyrrolidone, lithium chloride, lithium perchlorate etc. or wherein two or more mixture.
Further, described 2nd polymers soln is formulated by polymkeric substance, solvent, nonsolvent additive, wherein polymkeric substance massfraction in the solution is 5-45%, and the massfraction in the solution of solvent is 30-90%, and the massfraction in nonsolvent additive solution is 5-25%; Described polymkeric substance comprises: polysulfones, polyethersulfone, polyimide, polyetherimide, polymeric amide or wherein two or more mixture; Described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N, N-dimethyl pyrrolidone, dimethyl sulfoxide (DMSO) etc. or wherein two or more mixture; Described nonsolvent additive comprises: methyl alcohol, ethanol, ethylene glycol, propylene glycol, glycerol, polyoxyethylene glycol, acetone, polyvinylpyrrolidone, lithium chloride, lithium perchlorate etc. or wherein two or more mixture.
Further, described coagulation bath consists of deionized water and solvent mixture, wherein solvent ratios is 0-15%, and described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N, N-dimethyl pyrrolidone, dimethyl sulfoxide (DMSO) wherein two or more mixture.
Further, in described interfacial polymerization process, comprising aqueous phase solution and oil-phase solution, in aqueous phase solution, reaction monomers is mphenylenediamine, and in oil-phase solution, reaction monomers is pyromellitic trimethylsilyl chloride; Described aqueous phase solution is characterized in that: mphenylenediamine concentration is 0.5-5%; Described oil-phase solution, it is characterised in that: oil phase solvent comprises Skellysolve A, normal hexane, hexanaphthene or sherwood oil, and pyromellitic trimethylsilyl chloride concentration is 0.03-0.3%.
The invention also discloses the equipment of the compound forward osmosis membrane of a kind of continuous production, comprise supporter and put volume rotary drum, the first film-casting machine structure, the first gel groove, drying oven, the 2nd film-casting machine structure, the 2nd gel groove, interfacial polymerization mechanism, the first rolling rotary drum collection, the 2nd rolling rotary drum;
Described first film-casting machine structure is arranged on described supporter and puts volume rotary drum upper outlet place, and described first gel groove is arranged on described supporter and puts volume rotary drum bottom; Propping material is put after volume rotary drum transmits through supporter and is entered described first gel groove after the first polymers soln is smeared at described first film-casting machine structure place; Propping material surface is imported into described drying oven after forming the first polymer layer and dries; Smear the described 2nd gel groove entering after the 2nd polymers soln and being arranged on described 2nd film-casting machine structure bottom through the 2nd film-casting machine structure after oven dry; Propping material imports described interfacial polymerization mechanism after forming the 2nd polymeric layer and carries out interfacial polymerization, after described first polymer layer is peeled off from composite structure, collect compound forward osmosis membrane in described first rolling rotary drum collection place, collect, at described 2nd rolling rotary drum place, the first polymer layer peeled off.
Further, described first film-casting machine structure comprises the hopper of splendid attire polymers soln and the dispense tip sprawled in supporting body surface by polymers soln or scraper.
Further, described 2nd film-casting machine structure comprises the hopper of splendid attire polymers soln and the dispense tip sprawled in supporting body surface by polymers soln or scraper.
The useful effect of the present invention is: the method for the present invention is simple, first loose supporting body surface with full-bodied first film-casting liquid coating and in coagulation bath curing molding, the compound support obtained has higher physical strength, is conducive to the operability improved in continous way coating process. During curing molding, due to the existence of the first polymer layer, effectively prevent the seepage of low viscosity the 2nd film-casting liquid, ensure that the integrity of the 2nd polymer layer in coagulation bath after the 2nd film-casting liquid of the another side coating low viscosity of compound support. In the surface enforcement interfacial polymerization of the 2nd polymer layer, form the desalination layer of the aromatic polyamides structure with selective penetrated property. Finally the first polymer layer is peeled off from composite structure, can effectively reduce the total thickness of the forward osmosis membrane of final formation, weaken the internal concentration polarization phenomenon in supporting layer, it is to increase the permeation flux of forward osmosis membrane and efficiency.
Accompanying drawing explanation
Fig. 1 is the compound forward osmosis membrane continuous production equipment flowsheet schematic diagram that the present invention relates to. Wherein
1 for putting volume rotary drum, in order to transfer in system by supporter;
2 is the first film-casting machine structure, in order to apply the first film-casting liquid;
3 is the first gel groove, in order to gel first film-casting liquid;
4 is drying oven, in order to dry compound support;
5 is the 2nd film-casting machine structure, in order to apply the 2nd film-casting liquid;
6 is the 2nd gel groove, in order to gel the 2nd film-casting liquid;
7 is interfacial polymerization mechanism, in order to compound aromatic polyamides desalination layer;
8 is the first rolling rotary drum, in order to collect positive osmosis composite membrane;
9 is the 2nd rolling rotary drum, in order to collect the first polymer layer peeled off.
Embodiment
The specific embodiment of the present invention being further described below in conjunction with accompanying drawing, following examples are only for clearly illustrating the technical scheme of the present invention, and can not limit the scope of the invention with this.
The concrete technical scheme of the present invention is as follows:
Propping material is put volume rotary drum 1 through supporter and is passed to the first film-casting machine structure 2; Side applies the first polymers soln, and the coagulation bath immersing the first gel groove 3 forms the first polymer layer; After dry to be formed through drying oven 4 there is the composite supporting layer of more high strength; Dried composite supporting layer is transported to the 2nd film-casting machine structure 5 subsequently, another side coating second layer polymers soln of the first polymer layer in described composite supporting layer; The coagulation bath entering the 2nd gel groove 6 forms the 2nd polymer layer; Enter interfacial polymerization mechanism 7 subsequently and carry out interfacial polymerization, form the desalination layer with crosslinking structure on its surface; Being peeled off from composite structure by described first polymer layer, obtain forward osmosis membrane, formation subtracts thin composite membrane and is final compound forward osmosis membrane, collects 8 by the first rolling rotary drum; The first polymer layer being stripped collects 9 by the 2nd rolling rotary drum.
Further, described propping material is non-woven fabrics or woven; Further, the material of described non-woven fabrics includes but not limited to polyethylene terephthalate, polypropylene or polyethylene or its mixture; Further, described nonwoven thickness is not more than 50 ��m, and weight per unit area is less than 50g/m2, ventilative rate is greater than 100mL/cm2/ s; For woven type supporter, its thickness requirement requires between 5-50 ��m, and weight per unit area requires between 5-50g/m2, order number requires between 20-200 order.
Further, described first polymers soln is formulated by polymkeric substance, solvent, nonsolvent additive, wherein polymkeric substance massfraction in the solution is 5-45%, and the massfraction in the solution of solvent is 30-90%, and the massfraction in nonsolvent additive solution is 5-25%. Further, described polymkeric substance comprises: polyvinyl chloride, polyacrylonitrile, polysulfones, polyethersulfone, polyimide, polyetherimide, polymeric amide or wherein two or more mixture; Described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N-Methyl pyrrolidone, dimethyl sulfoxide (DMSO) etc. or wherein two or more mixture; Described nonsolvent additive, comprising: methyl alcohol, ethanol, ethylene glycol, propylene glycol, glycerol, polyoxyethylene glycol, acetone, polyvinylpyrrolidone, lithium chloride, lithium perchlorate etc. or wherein two or more mixture.
Further, described 2nd polymers soln is formulated by polymkeric substance, solvent, nonsolvent additive, wherein polymkeric substance massfraction in the solution is 5-45%, and the massfraction in the solution of solvent is 30-90%, and the massfraction in nonsolvent additive solution is 5-25%; Described polymkeric substance comprises: polysulfones, polyethersulfone, polyimide, polyetherimide, polymeric amide or wherein two or more mixture; Described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N, N-dimethyl pyrrolidone, dimethyl sulfoxide (DMSO) etc. or wherein two or more mixture; Described nonsolvent additive comprises: methyl alcohol, ethanol, ethylene glycol, propylene glycol, glycerol, polyoxyethylene glycol, acetone, polyvinylpyrrolidone, lithium chloride, lithium perchlorate etc. or wherein two or more mixture.
Further, described coagulation bath consists of deionized water and solvent mixture, wherein solvent ratios is 0-15%, and described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N, N-dimethyl pyrrolidone, dimethyl sulfoxide (DMSO) wherein two or more mixture.
Further, in described interfacial polymerization process, comprising aqueous phase solution and oil-phase solution, in aqueous phase solution, reaction monomers is mphenylenediamine, and in oil-phase solution, reaction monomers is pyromellitic trimethylsilyl chloride; Described aqueous phase solution is characterized in that: mphenylenediamine concentration is 0.5-5%; Described oil-phase solution, it is characterised in that: oil phase solvent comprises Skellysolve A, normal hexane, hexanaphthene or sherwood oil, and pyromellitic trimethylsilyl chloride concentration is 0.03-0.3%.
The invention also discloses the equipment of the compound forward osmosis membrane of a kind of continuous production, comprise supporter and put volume rotary drum 1, first film-casting machine structure 2, first gel groove 3, drying oven 4, the 2nd film-casting machine structure 5, the 2nd gel groove 6, interfacial polymerization mechanism 7, first rolling rotary drum collection the 8, the 2nd rolling rotary drum 9;
Described first film-casting machine structure 2 is arranged on described supporter and puts volume rotary drum 1 upper outlet place, and described first gel groove 3 is arranged on described supporter and puts volume rotary drum 1 bottom; Propping material is put after volume rotary drum 1 transmits through supporter and is entered described first gel groove 3 after the first polymers soln is smeared at described first film-casting machine structure 2 place; Propping material surface is imported into described drying oven 4 after forming the first polymer layer and dries; Smear the described 2nd gel groove 6 entering after the 2nd polymers soln and being arranged on described 2nd film-casting machine structure 5 bottom through the 2nd film-casting machine structure 5 after oven dry; Propping material imports described interfacial polymerization mechanism 7 after forming the 2nd polymeric layer and carries out interfacial polymerization, after described first polymer layer is peeled off from composite structure, collect 8 places at described first rolling rotary drum and collect compound forward osmosis membrane, collect, at described 2nd rolling rotary drum 9 place, the first polymer layer peeled off.
Further, described first film-casting machine structure 2 comprises the hopper of splendid attire polymers soln and the dispense tip sprawled in supporting body surface by polymers soln or scraper.
Further, the 2nd film-casting machine structure 5 comprises the hopper of splendid attire polymers soln and the dispense tip sprawled in supporting body surface by polymers soln or scraper.
The above is only the preferred embodiments of the present invention; it is noted that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also making some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a method for the compound forward osmosis membrane of continuous production, described method comprises:
1) apply the first polymers soln in propping material first side, under coagulation bath environment, form the first polymer layer;
2) by step 1) propping material with the first polymer layer that formed dries, and forms the composite supporting layer with more high strength;
3) in described composite supporting layer, the 2nd side of the first polymer layer applies second layer polymers soln, forms the 2nd polymer layer under coagulation bath environment;
4) carry out interfacial polymerization on the 2nd surface, side of described 2nd polymer layer, form the desalination layer with crosslinking structure;
5) described first polymer layer is peeled off from composite structure, obtain forward osmosis membrane.
2. the method for continuous production forward osmosis membrane according to claim 1, it is characterised in that: described propping material is non-woven fabrics; The material of described non-woven fabrics includes but not limited to polyethylene terephthalate, polypropylene or polyethylene or its mixture.
3. according to the method for the continuous production forward osmosis membrane described in claim 1, it is characterized in that: described first polymers soln is formulated by polymkeric substance, solvent, nonsolvent additive, wherein polymkeric substance massfraction in the solution is 5-45%, the massfraction in the solution of solvent is 30-90%, and the massfraction in nonsolvent additive solution is 5-25%.
4. the method for continuous production forward osmosis membrane according to claim 1, affiliated polymkeric substance comprises: polyvinyl chloride, polyacrylonitrile, polysulfones, polyethersulfone, polyimide, polyetherimide, polymeric amide or wherein two or more mixture; Described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N-Methyl pyrrolidone, dimethyl sulfoxide (DMSO) or wherein two or more mixture; Described nonsolvent additive, comprising: methyl alcohol, ethanol, ethylene glycol, propylene glycol, glycerol, polyoxyethylene glycol, acetone, polyvinylpyrrolidone, lithium chloride, lithium perchlorate or wherein two or more mixture.
5. according to the method for the continuous production forward osmosis membrane described in claim 1, it is characterised in that: described coagulation bath consists of deionized water and solvent mixture, and wherein solvent ratios is 0-15%.
6. the method for continuous production forward osmosis membrane according to claim 1, described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N, N-dimethyl pyrrolidone, dimethyl sulfoxide (DMSO) wherein two or more mixture; Described 2nd polymers soln is formulated by polymkeric substance, solvent, nonsolvent additive, wherein polymkeric substance massfraction in the solution is 5-45%, the massfraction in the solution of solvent is 30-90%, and the massfraction in nonsolvent additive solution is 5-25%; Described polymkeric substance comprises: polysulfones, polyethersulfone, polyimide, polyetherimide, polymeric amide or wherein two or more mixture; Described solvent comprises: dimethyl formamide, N,N-DIMETHYLACETAMIDE, N, N-dimethyl pyrrolidone, dimethyl sulfoxide (DMSO) or wherein two or more mixture; Described nonsolvent additive comprises: methyl alcohol, ethanol, ethylene glycol, propylene glycol, glycerol, polyoxyethylene glycol, acetone, polyvinylpyrrolidone, lithium chloride, lithium perchlorate or wherein two or more mixture.
7. according to the method for the continuous production forward osmosis membrane described in claim 1, it is characterized in that: in described interfacial polymerization process, comprising aqueous phase solution and oil-phase solution, in aqueous phase solution, reaction monomers is mphenylenediamine, and in oil-phase solution, reaction monomers is pyromellitic trimethylsilyl chloride; Described aqueous phase solution is characterized in that: mphenylenediamine concentration is 0.5-5%; Described oil-phase solution is characterized in that: oil phase solvent comprises Skellysolve A, normal hexane, hexanaphthene or sherwood oil, and pyromellitic trimethylsilyl chloride concentration is 0.03-0.3%.
8. an equipment for the compound forward osmosis membrane of continuous production, comprises supporter and puts volume rotary drum (1), the first film-casting machine structure (2), the first gel groove (3), drying oven (4), the 2nd film-casting machine structure (5), the 2nd gel groove (6), interfacial polymerization mechanism (7), the first rolling rotary drum collection (8), the 2nd rolling rotary drum (9);
Described first film-casting machine structure (2) is arranged on described supporter and puts volume rotary drum (1) upper outlet place, and described first gel groove (3) is arranged on described supporter and puts volume rotary drum (1) bottom; Propping material is put after volume rotary drum (1) transmits through supporter and is entered described first gel groove (3) after the first polymers soln is smeared at described first film-casting machine structure (2) place; Propping material surface is imported into described drying oven (4) after forming the first polymer layer and dries; After the 2nd film-casting machine structure (5) smears the 2nd polymers soln, the described 2nd gel groove (6) being arranged on described 2nd film-casting machine structure (5) bottom is entered after oven dry; Propping material imports described interfacial polymerization mechanism (7) after forming the 2nd polymeric layer and carries out interfacial polymerization, after described first polymer layer is peeled off from composite structure, collect (8) place at described first rolling rotary drum and collect compound forward osmosis membrane, collect, at described 2nd rolling rotary drum (9) place, the first polymer layer peeled off.
9., according to the equipment of the compound forward osmosis membrane of the continuous production described in claim 8, described first film-casting machine structure (2) comprises the hopper of splendid attire polymers soln and the dispense tip sprawled in supporting body surface by polymers soln or scraper.
10., according to the equipment of the compound forward osmosis membrane of the continuous production described in claim 8, described 2nd film-casting machine structure (5) comprises the hopper of splendid attire polymers soln and the dispense tip sprawled in supporting body surface by polymers soln or scraper.
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| CN106362599A (en) * | 2016-08-29 | 2017-02-01 | 无锡零界净化设备有限公司 | Preparation method of supporting-layer-free micro-porous flat plate filter membrane |
| CN106823826A (en) * | 2017-02-15 | 2017-06-13 | 北京新源国能科技集团股份有限公司 | A kind of continuous preparation method of the compound forward osmosis membrane of high flux |
| CN106975368A (en) * | 2016-10-20 | 2017-07-25 | 北京碧水源膜科技有限公司 | A kind of continuous method and its equipment for preparing SPSF composite nanometer filtering film |
| CN107715703A (en) * | 2017-11-08 | 2018-02-23 | 厦门世脉科技有限公司 | A kind of process units and method of MULTILAYER COMPOSITE Flat Membrane |
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| CN114797493A (en) * | 2022-04-26 | 2022-07-29 | 西南石油大学 | Temperature-resistant composite separation membrane and preparation method thereof |
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Application publication date: 20160601 |