CN105502774A - Carbon dioxide functional water preparation system - Google Patents
Carbon dioxide functional water preparation system Download PDFInfo
- Publication number
- CN105502774A CN105502774A CN201610034703.5A CN201610034703A CN105502774A CN 105502774 A CN105502774 A CN 105502774A CN 201610034703 A CN201610034703 A CN 201610034703A CN 105502774 A CN105502774 A CN 105502774A
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- Prior art keywords
- carbonic acid
- acid gas
- pure water
- functional water
- preparation system
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a carbon dioxide functional water preparation system. The carbon dioxide functional water is applied to an industrial manufacturing system. The carbon dioxide functional water preparation system comprises a pure water polishing system, a dissolver, an ultrafilter unit and a degasser, wherein the dissolver is connected between the pure water polishing system and the ultrafilter unit; the ultrafilter unit is connected with the industrial manufacturing system through a pipeline; the degasser is connected between the pure water polishing system and the industrial manufacturing system; and water used by the industrial manufacturing system is degassed by the degasser and flows back to the pure water polishing system. The carbon dioxide functional water preparation system can avoid waste of water resources and lower the cost.
Description
Technical field
The present invention relates to water treatment field, particularly relate to a kind of carbonic acid gas functional water preparation system of reusable edible.
Background technology
Carbonic acid gas functional water is dissolved in ultrapure water by carbon dioxide and obtains.The especially consumer electronics such as display screen, touch-screen field in industry manufactures, often need to clean glass substrate, and usually with electrostatic on glass substrate, in carbonic acid gas functional water, there is carbonic acid, ionization can be there is and produce ion in carbonic acid, clean described sheet glass with carbonic acid gas functional water, the electrostatic on described glass substrate can be neutralized.In prior art, prepare carbonic acid gas functional water, normally adopt independently pure water polishing system to be stored in ultrapure water storage tank after obtaining ultrapure water, then obtain carbonic acid gas functional water through independently carbonic acid gas functional water preparation system.
Refer to Fig. 1 a, independently pure water polishing system is connected in sequence by pure water storage tank, heat exchanger, sterilizing unit, burnishing device and ultra-filtration filters device usually, obtained ultrapure water, be stored in ultrapure water storage tank, wherein, the former water of preparation as ultrapure water be pure water, described pure water is provided by pure water making system, and is stored in described pure water storage tank.Ultrapure resistivity of water is greater than 18M Ω * cm.Refer to Fig. 1 b, independently carbonic acid gas functional water preparation system is connected in sequence by ultrapure water storage tank, dissolver and ultra-filtration filters device, finally for glass substrate provides carbonic acid gas functional water.
Carbonic acid gas functional water can also as pure water recycle after having washed glass substrate, pure water storage tank is flowed back to by glass substrate washing procedure, again through independently pure water polishing system and independently carbonic acid gas functional water preparation system, and then for the washing of glass substrate.But, when carbonic acid gas functional water circulation number of times and/or the water yield many time, carbonic acid gas and other impurity get more and more, and easily cause carbon dioxide content defective, contaminant overstandard, thus cause deteriorating water quality, pure water can not be re-used as after deteriorating water quality directly flow back in the pure water storage tank of pure water polishing system, but will emit or flow back in pure water making system and again process, if emit, then can waste a large amount of water resourcess, and cause cost significantly to improve; If flow back into pure water making system again to process, then make the treatment capacity of pure water making system greatly increase, and pure water making system comprises a series of plant and instrument, this significantly can increase equipment cost.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of carbonic acid gas functional water preparation system, and described carbonic acid gas functional water preparation system can avoid water resource waste, and reduces costs.
In order to solve the problems of the technologies described above, the present invention by the following technical solutions:
The invention provides a kind of carbonic acid gas functional water preparation system, described carbonic acid gas functional water is applied to industrial manufacturing system, described carbonic acid gas functional water preparation system comprises pure water polishing system, dissolver, ultra-filtration filters device and de-gassing vessel, described dissolver is connected between described pure water polishing system and described ultra-filtration filters device, described ultra-filtration filters device is connected with described industrial manufacturing system by pipeline, described de-gassing vessel is connected between described pure water polishing system and described industrial manufacturing system, the water that described industrial manufacturing system is crossed carries out flowing back to described pure water polishing system after degassed process through described de-gassing vessel.
Wherein, described pure water polishing system comprises the pure water storage tank, sterilizing unit and the burnishing device that connect successively, and described de-gassing vessel is connected between described pure water storage tank and described industrial manufacturing system.
Wherein, described pure water polishing system also comprises temperature regulating device, and described temperature regulating device is connected between described pure water storage tank and described sterilizing unit.
Wherein, described pure water polishing system also comprises auxiliary ultra-filtration filters device, and described auxiliary ultra-filtration filters device is connected between described dissolver and described burnishing device.
Wherein, described pure water polishing system also comprises pretreatment unit, and described pretreatment unit is connected between described pure water storage tank and described temperature regulating device.
Wherein, described pretreatment unit is more medium filter or absorbent charcoal adsorber.
Wherein, described carbonic acid gas functional water preparation system also comprises pretreatment unit, and described pretreatment unit is connected between described de-gassing vessel and described pure water polishing system.
Wherein, described carbonic acid gas functional water preparation system also comprises pretreatment unit, and described pretreatment unit is connected between described de-gassing vessel and described industrial manufacturing system.
Compared with prior art, technical scheme of the present invention at least has following beneficial effect:
In technical scheme of the present invention, because described carbonic acid gas functional water preparation system comprises pure water polishing system, dissolver, ultra-filtration filters device and de-gassing vessel, described dissolver is connected between described pure water polishing system and described ultra-filtration filters device, described ultra-filtration filters device is connected with described industrial manufacturing system by pipeline, described de-gassing vessel is connected between described pure water polishing system and industrial manufacturing system, thus the preparation process of pure water polishing process and carbonic acid gas functional water is integrated, described de-gassing vessel is made to be connected between described pure water polishing system and industrial manufacturing system, so, the water that industrial manufacturing system can be made to flow out flows back to described pure water polishing system again after described de-gassing vessel, thus prevent the deteriorating water quality of the water flowing back to described pure water polishing system, and then avoid being emitted by water or allow current return in pure water making system, stop the waste of water resources, and avoid the equipment cost of pure water making system to increase, thus reduce water resources cost and equipment cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other variant can also be obtained according to these accompanying drawings.
Fig. 1 a is the structured flowchart of independently pure water polishing system in prior art;
Fig. 1 b is the block diagram of independently carbonic acid gas functional water preparation system and industrial manufacturing system in prior art;
Fig. 2 is the structured flowchart of carbonic acid gas functional water preparation system in first embodiment of the invention;
Fig. 3 is the structured flowchart of the carbonic acid gas functional water preparation system of an embodiment in first embodiment of the invention;
Fig. 4 is the structured flowchart of carbonic acid gas functional water preparation system in second embodiment of the invention;
Fig. 5 is the structured flowchart of carbonic acid gas functional water preparation system in third embodiment of the invention;
Fig. 6 is the structured flowchart of carbonic acid gas functional water preparation system in fourth embodiment of the invention;
Fig. 7 is the structured flowchart of carbonic acid gas functional water preparation system in fifth embodiment of the invention; And
Fig. 8 is the structured flowchart of carbonic acid gas functional water preparation system in sixth embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 2, Fig. 2 is the structured flowchart of carbonic acid gas functional water preparation system in first embodiment of the invention.Described carbonic acid gas functional water is applied to industrial manufacturing system 500, such as, and the manufacturing system in the consumer electronics such as display screen, touch-screen field.In the present embodiment (the first embodiment), carbonic acid gas functional water preparation system comprises pure water polishing system 100, dissolver 200, ultra-filtration filters device 300 and de-gassing vessel 400.Described dissolver 200 is connected between described pure water polishing system 100 and described ultra-filtration filters device 300, described ultra-filtration filters device 300 is connected with described industrial manufacturing system 500 by pipeline, described de-gassing vessel 400 is connected between described pure water polishing system 100 and described industrial manufacturing system 500, and described industrial manufacturing system 500 water crossed flows back to described pure water polishing system 100 after described de-gassing vessel 400 carries out degassed process.
Described pure water polishing system 100 is for providing ultrapure water for described carbonic acid gas functional water preparation system, and described ultrapure resistivity of water is greater than 18M Ω * cm.
The ultrapure water that dissolver 200 provides for carbon dioxide being dissolved in pure water polishing system 100, forms carbonic acid gas functional water.Dissolver 200 can be dissolving film or other dissolver, described dissolver 200 can be hollow fiber right cylinder, there is gas molecule can by described dissolver 200, and water is not by described dissolver 200, right cylinder built with high-pressure carbon dioxide gas, current when described right cylinder, because carbon dioxide is in high pressure conditions, so flow outward and be dissolved in the water, thus form carbonic acid gas functional water.
Then, the carbonic acid gas functional water formed is again through ultra-filtration filters device 300, by the molecule filtering in described carbonic acid gas functional water, obtain purer carbonic acid gas functional water, again described carbonic acid gas functional water is delivered to described industrial manufacturing system, cleans the substrate of this kind of static electrification of such as glass substrate.Described ultra-filtration filters device 300 can be ultra-filtration membrane or other ultra-filtration filters device, described ultra-filtration membrane is asymmetry ultra-filtration membrane, there is finer and close top layer and the bottom based on dactylitic texture, skin depth is less than or equal to 0.1 micron, and there is the orderly micropore of arrangement, underlayer thickness is 200 ~ 250 microns.The ultra-filtration membrane of industrial application is generally asymmetric membrane.The mould material of ultra-filtration membrane can be cellulose and its derivates, polycarbonate, polyvinyl chloride, polyvinylidene difluoride (PVDF), polysulfones, polyacrylonitrile, polymeric amide, polysulfonamides, SPSF, the polyvinyl alcohol of interlinkage or modified acrylic polymer.
Described de-gassing vessel 400 is for carrying out degassed process to the industrial manufacturing system 500 carbonic acid gas functional water crossed, by the carbon dioxide in carbonic acid gas functional water and other gas (such as, oxygen, ammonia etc.) remove, and then conveying is got back in described pure water polishing system 100, again utilizes.Like this, each carbonic acid gas all removes and flows back to pure water polishing system 100 again, and water quality is not easy to decline, and avoids emitting water resources or again flow back to pure water making system (not shown) and again prepares, thus reduce costs.Described de-gassing vessel 400 can be degassing film or other degassed device.Degassing film utilizes the principle of diffusion by the gas in water, as the membrane sepn product of carbonic acid gas, oxygen, ammonia nitrogen removal.Degassing film, built with a large amount of tubular fibres, the wall of fiber has small hole, and water molecules is not by this aperture, and gas molecule can pass.During work, current pass through from the inside of tubular fibre under pressure, and gas is constantly taken away by the outside of tubular fibre under the effect of vacuum pump, and form certain negative pressure, gas in such water is just continuous outwards to be overflowed through tubular fibre from water, thus reach the object removing gas in water, the area that a large amount of tubular fibres can expand liquid-gas interface is housed in degassing film, thus degassing rate is accelerated.The material of described degassing film can be polypropylene macromolecule polymer material or tetrafluoroethylene macromolecule polymer material.Degassing membrane component can be customized according to treatment capacity.
Refer to Fig. 3, Fig. 3 is the structured flowchart of the carbonic acid gas functional water preparation system of an embodiment in first embodiment of the invention.In an embodiment of the present embodiment (the first embodiment), described pure water polishing system 100 comprises the pure water storage tank 110, sterilizing unit 120 and the burnishing device 130 that connect successively, and described de-gassing vessel 400 is connected between described pure water storage tank 110 and described industrial manufacturing system 500.
The pure water that described pure water storage tank 110 provides for storing pure water making system (not shown).Described sterilizing unit 120 can be ultraviolet lamp or other sterilization devices, what described sterilizing unit 120 played act as sterilization, sterilization, photolysis degraded and other photochmeical reaction, the life bacterium of the class such as pathogen enterobacteria, pyococcus, acarid and virus etc. can be killed, and macromole molecular substance is degraded into small molecules goods and materials, described sterilizing unit 120 can be immersion or overflow-type, the sterilizing unit 120 of immersion relatively simple for structure, directly can be inserted in water and use; The fluorescent tube of the sterilizing unit 120 of overflow-type is contained in sleeve pipe usually, and the original paper such as electric control box combination (not shown) uses.Described burnishing device 130 can be polishing resin and other polishing device, and described burnishing device 130 is for reducing TOC total value and SiO
2content.
In the present embodiment, because described carbonic acid gas functional water preparation system comprises pure water polishing system, dissolver, ultra-filtration filters device and de-gassing vessel, described dissolver is connected between described pure water polishing system and described ultra-filtration filters device, described ultra-filtration filters device is connected with described industrial manufacturing system by pipeline, described de-gassing vessel is connected between described pure water polishing system and described industrial manufacturing system, thus the preparation process of pure water polishing process and carbonic acid gas functional water is integrated, in addition, described de-gassing vessel is made to be connected between described pure water polishing system and industrial manufacturing system, so, the water that industrial manufacturing system can be made to flow out flows back to described pure water storage tank again after described de-gassing vessel, thus prevent the deteriorating water quality of the water flowing back to described pure water storage tank, and then avoid being emitted by water or allow current return in pure water making system, stop the waste of water resources, and avoid the equipment cost of pure water making system to increase, thus reduce water resources cost and equipment cost.
Refer to Fig. 4, Fig. 4 is the structured flowchart of carbonic acid gas functional water preparation system in second embodiment of the invention.The structure of the carbonic acid gas functional water preparation system in the present embodiment (the second embodiment) is substantially identical with the structure and function of the preparation system of carbonic acid gas functional water described in the first embodiment, difference is: the pure water polishing system 100 of the present embodiment also comprises temperature regulating device 140, and described temperature regulating device 140 is connected between described pure water storage tank 110 and described sterilizing unit 120.Described temperature control unit 140 can be heat exchanger or other temperature regulator.Described temperature control unit 140 for maintaining the temperature of water in described carbonic acid gas functional water preparation system in a certain temperature range, such as, in the scope of 22 DEG C to 24 DEG C.
In the present embodiment, the pure water polishing system of described carbonic acid gas functional water preparation system also comprises temperature regulating device, in order to keep the constant of water temperature, thus all water can be carried out at the same temperature in treating processes, keeps the consistence of water quality.
Refer to Fig. 5, Fig. 5 is the structured flowchart of carbonic acid gas functional water preparation system in third embodiment of the invention.The structure of the carbonic acid gas functional water preparation system in the present embodiment (the 3rd embodiment) is substantially identical with the structure and function of the preparation system of carbonic acid gas functional water described in the second embodiment, difference is: in the present embodiment, the described pure water polishing system of described carbonic acid gas functional water preparation system also comprises auxiliary ultra-filtration filters device 150, and described auxiliary ultra-filtration filters device 150 is connected between described dissolver 200 and described burnishing device 130.Described auxiliary ultra-filtration filters device 150 can be symmetry ultra-filtration membrane or asymmetry ultra-filtration membrane, can certainly be other equivalence ultrafiltration device.
In the present embodiment, the described pure water polishing system of described carbonic acid gas functional water preparation system also comprises auxiliary ultra-filtration filters device 150, thus before preparing carbonic acid gas functional water, pre-ultrafiltration has been done to water, make follow-up ultra-filtration filters device 300 filter more thorough to the particulate etc. in described carbonic acid gas functional water.
Refer to Fig. 6, Fig. 6 is the structured flowchart of carbonic acid gas functional water preparation system in fourth embodiment of the invention.The structure of the carbonic acid gas functional water preparation system in the present embodiment (the 4th embodiment) is substantially identical with the structure and function of the preparation system of carbonic acid gas functional water described in the second embodiment, difference is: in the present embodiment, the described pure water polishing system of described carbonic acid gas functional water preparation system also comprises pretreatment unit 160, and described pretreatment unit 160 is connected between described pure water storage tank 110 and described temperature regulating device 140.Described pretreatment unit 160 can be more medium filter or absorbent charcoal adsorber, when causing deteriorating water quality for preventing from occurring in described pure water storage tank surprisingly, to the pre-treatment of water, to ensure water quality reaching standard.
In the present embodiment, the described pure water polishing system of described carbonic acid gas functional water preparation system also comprises pretreatment unit 160, ensures the quality of the carbonic acid gas functional water of described carbonic acid gas functional water preparation system further.
Refer to Fig. 7, Fig. 7 is the structured flowchart of carbonic acid gas functional water preparation system in fifth embodiment of the invention.The structure of the carbonic acid gas functional water preparation system in the present embodiment (the 5th embodiment) is substantially identical with the structure and function of carbonic acid gas functional water preparation system described in the 4th embodiment, difference is: in the present embodiment, described carbonic acid gas functional water preparation system comprises pretreatment unit 160, described pretreatment unit 160 is connected between described de-gassing vessel 400 and described pure water polishing system 110, particularly, described pretreatment unit 160 is connected between the pure water storage tank of described de-gassing vessel 400 and described pure water polishing system 100.
Refer to Fig. 8, Fig. 8 is the structured flowchart of carbonic acid gas functional water preparation system in sixth embodiment of the invention.The structure of the carbonic acid gas functional water preparation system in the present embodiment (the 6th embodiment) is substantially identical with the structure and function of carbonic acid gas functional water preparation system described in the 5th embodiment, difference is: in the present embodiment, described carbonic acid gas functional water preparation system also comprises pretreatment unit 160, and described pretreatment unit 160 is connected between described de-gassing vessel 400 and described industrial manufacturing system 500.
In the present embodiment, described carbonic acid gas functional water preparation system comprises pretreatment unit 160, ensures the quality of the carbonic acid gas functional water of described carbonic acid gas functional water preparation system further.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Above-described embodiment, does not form the restriction to this technical scheme protection domain.The amendment done within any spirit at above-mentioned embodiment and principle, equivalently to replace and improvement etc., within the protection domain that all should be included in this technical scheme.
Claims (8)
1. a carbonic acid gas functional water preparation system, it is characterized in that, described carbonic acid gas functional water preparation system comprises pure water polishing system, dissolver, ultra-filtration filters device and de-gassing vessel, described dissolver is connected between described pure water polishing system and described ultra-filtration filters device, described ultra-filtration filters device is connected with industrial manufacturing system by pipeline, described de-gassing vessel is connected between described pure water polishing system and described industrial manufacturing system, the water that described industrial manufacturing system is crossed carries out flowing back to described pure water polishing system after degassed process through described de-gassing vessel.
2. carbonic acid gas functional water preparation system as claimed in claim 1, it is characterized in that, described pure water polishing system comprises the pure water storage tank, sterilizing unit and the burnishing device that connect successively, and described de-gassing vessel is connected between described pure water storage tank and described industrial manufacturing system.
3. carbonic acid gas functional water preparation system as claimed in claim 2, it is characterized in that, described pure water polishing system also comprises temperature regulating device, and described temperature regulating device is connected between described pure water storage tank and described sterilizing unit.
4. carbonic acid gas functional water preparation system as claimed in claim 3, it is characterized in that, described pure water polishing system also comprises auxiliary ultra-filtration filters device, and described auxiliary ultra-filtration filters device is connected between described dissolver and described burnishing device.
5. carbonic acid gas functional water preparation system as claimed in claim 3, it is characterized in that, described pure water polishing system also comprises pretreatment unit, and described pretreatment unit is connected between described pure water storage tank and described temperature regulating device.
6. carbonic acid gas functional water preparation system as claimed in claim 5, it is characterized in that, described pretreatment unit is more medium filter or absorbent charcoal adsorber.
7. the carbonic acid gas functional water preparation system as described in any one of Claims 1-4, it is characterized in that, described carbonic acid gas functional water preparation system also comprises pretreatment unit, and described pretreatment unit is connected between described de-gassing vessel and described pure water polishing system.
8. the carbonic acid gas functional water preparation system as described in any one of Claims 1-4, it is characterized in that, described carbonic acid gas functional water preparation system also comprises pretreatment unit, and described pretreatment unit is connected between described de-gassing vessel and described industrial manufacturing system.
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| CN201610034703.5A CN105502774B (en) | 2016-01-19 | 2016-01-19 | Carbon dioxide functional water preparation system |
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| CN201610034703.5A CN105502774B (en) | 2016-01-19 | 2016-01-19 | Carbon dioxide functional water preparation system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4698153A (en) * | 1984-02-08 | 1987-10-06 | Hitachi, Ltd. | Apparatus for producing ultra-pure water by ion exchange resin |
| CN103359850A (en) * | 2012-04-09 | 2013-10-23 | 野村微科学股份有限公司 | Ultrapure water manufacturing apparatus |
| CN103588276A (en) * | 2013-10-15 | 2014-02-19 | 苏州斯尔特微电子有限公司 | CO2 foaming machine |
-
2016
- 2016-01-19 CN CN201610034703.5A patent/CN105502774B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4698153A (en) * | 1984-02-08 | 1987-10-06 | Hitachi, Ltd. | Apparatus for producing ultra-pure water by ion exchange resin |
| CN103359850A (en) * | 2012-04-09 | 2013-10-23 | 野村微科学股份有限公司 | Ultrapure water manufacturing apparatus |
| CN103588276A (en) * | 2013-10-15 | 2014-02-19 | 苏州斯尔特微电子有限公司 | CO2 foaming machine |
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