CN1064935C - Method and equipment for preparing oxygen-rich water - Google Patents
Method and equipment for preparing oxygen-rich water Download PDFInfo
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- CN1064935C CN1064935C CN 97125836 CN97125836A CN1064935C CN 1064935 C CN1064935 C CN 1064935C CN 97125836 CN97125836 CN 97125836 CN 97125836 A CN97125836 A CN 97125836A CN 1064935 C CN1064935 C CN 1064935C
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Abstract
The present invention provides a preparation method of oxygen enrichment water, which comprises that a membrane of hydrophobic microporous polymer is adopted to make oxygen pass through one side of the membrane under pressure and water pass through the other side of the membrane. The present invention provides a device for the method, which comprises a casing, an air inlet, an air outlet, a water inlet, a water outlet and a microporous membrane. The device is characterized in that the microporous membrane is made from hydrophobic polymers. The method of the present invention is completely different from the method of the prior art of preparing the oxygen enrichment water, and has the advantages of convenient method and low cost; the method can be operated at normal temperature, and the products have a high oxygen content.
Description
Technical field
The present invention relates to a kind of gas-liquid mixed method, be specifically related to the blending means of a kind of oxygen and water, that is a kind of method for preparing heavy-oxygen-enriched water, also relate to the used device of this method.
Technical background
Common Liqiud-gas mixing device is an absorption column of gas.In the absorption tower, liquid through grid distributor from top to bottom in tower filling surface evenly flow down, and gas from bottom to top is blown in the tower, by inner-tower filling material, for gas-to-liquid contact provides huge surface-area.The operation on absorption tower has strict requirement to gas, liquor ratio, and liquid measure is little can to form liquid flooding, and narrow-minded liquid can form channel, and the two all can make operation worsen.In actual applications, a large amount of a small amount of gases of liquid-absorbent or small amount of liquid absorb the process of a large amount of gases, because of vapour-liquid ratio differs greatly, are difficult to realize in the absorption tower.
In recent years, a kind of " heavy-oxygen-enriched water " appears in developed countries such as the U.S., Canada, now reached China.This is a kind of healthy drinking water that injects high-purity oxygen in pure water or mineral water.The content of oxygen enrichment water oxygen is generally high 2～3 times than natural water, for about 20mg/L.Suppose that former water oxygen level is 6mg/L, charging into the oxygen amount is 14mg/L, after being converted into the gas volume under the standard state, vapour-liquid ratio is 1: 100, low tolerance like this, liquid will form channel in the absorption tower, and the gas-to-liquid contact situation worsens, gas absorbed efficiency is low, and therefore preparing heavy-oxygen-enriched water can't use the absorption tower.The preparation heavy-oxygen-enriched water generally adopts Bubbling method, spraying process, mechanical stirring hybrid system now ..., its main drawback is that the gas-to-liquid contact area is little, and oxygen utilization rate is low, and the heavy-oxygen-enriched water oxygen level is low.
Because Gas Solubility and water temperature are inversely proportional to, (for example: 30mg/L), current methods need be given water for cooling, and the acquisition of water at low temperature needs refrigeration system in order to make the higher heavy-oxygen-enriched water of oxygen level, not only increasing energy consumption has also increased facility investment and has brought many inconvenience to operation.In addition, for increasing the solubleness of oxygen, need sometimes to gas, liquid pressurization, for example, increase to 0.2～0.3MPa, the not only same increasing energy consumption of pressurization and make troubles to operation, then, can not the normal pressure can, need isobar filling, isobar filling machine equipment manufacturing cost height, the energy consumption height brings many inconvenience to operation equally.
Summary of the invention
Purpose of the present invention provides a kind of heavy-oxygen-enriched water preparation method who is different from above-mentioned prior art fully, for overcoming above-mentioned shortcoming, adopts hydrophobic porous film as gas-liquid contact media, with gas and liquid mixing.In specific words, oxygen can be mixed with water, prepare heavy-oxygen-enriched water with this.This method comprises uses a kind of polymer microporous film, passes through low-pressure water in a side of microporous membrane by low oxygen and at opposite side.Oxygen sees through fenestra, and high dispersing is evenly soluble in water apace, thereby obtains the heavy-oxygen-enriched water of elevated oxygen level.The present invention also provides a kind of Liqiud-gas mixing device, and this device comprises a shell, a kind of polymer microporous film, oxygen inlet, oxygen outlet, water inlet and water out.
Description of drawings
Fig. 1 is the hollow fiber film assembly structural representation.In Fig. 1,1 is tackiness agent, and 2 is hollow-fibre membrane, and 3 is outer tube, and 4 is water-in, and 5 is inlet mouth.Among the 1-A and 1-B of Fig. 1, the parts that identical digitized representation is identical.
Fig. 2, Fig. 3 are heavy-oxygen-enriched water preparation facilities synoptic diagram of the present invention, the parts that wherein identical digitized representation is identical.
Detailed Description Of The Invention
In conjunction with example in detail the present invention is described in detail referring now to accompanying drawing, certainly, described embodiment and embodiment are only for explanation absolutely not Restriction.
Design of the present invention mainly provides a kind of new gas-liquid contact media, make gas can high dispersing among liquid, increase the gas-to-liquid contact area as wide as possible, contact area is big more, the dissolution rate of gas in liquid is fast more, meltage is big more.In view of the hydrophobicity of film, as long as it is enough little to touch the aperture, for example: less than 0.1 μ m, under the pressure below the 1.1MPa, liquid, for example water just can not see through fenestra and move to opposite side from a side of film; But gas then can enter fenestra, migrates to opposite side from a side of film.Like this gas-liquid two-phase with the film by contact medium again tunicle isolated, can be by the operation of given separately flow velocity (or flow) and pressure, by film gas high dispersing among liquid, and thorough mixing, thereby obtain the liquid of high gas dissolving amount, in specific words, can make the heavy-oxygen-enriched water of elevated oxygen level.
Present heavy-oxygen-enriched water preparation method subject matter is that the gas-to-liquid contact area is little, if the bubble diameter of the drop of spraying process or Bubbling method can be less than 1mm, and every cm
3Liquid (or gas) body can be separated into 1.9 * 10
3Individual small droplets (or small bubbles), surface-area only are 60cm
2So little contact area is lowly just not at all surprising in order to its usefulness of preparation heavy-oxygen-enriched water.Owing to there is not better gas-liquid mixed method, for making the heavy-oxygen-enriched water of high oxygen content, the reinforcement means that adopt pressurization, give water for cooling of having to have not only increased facility investment and energy consumption, give to operate and have also brought many inconvenience.Both made like this, the heavy-oxygen-enriched water oxygen level that is obtained also is no more than 30mg/L.
According to the present invention, make the aqueous solution, for example: pure water, a side of the film of flowing through is at the opposite side feeding pure oxygen of film.For example selecting the equivalent aperture for use is the film of 0.05 μ m, if it is suitable with the equivalent aperture of film to see through the bubble size of fenestra ingoing stream, and every cm
3Gas will be separated into 1.5 * 10
16Individual small bubbles, than high 13 orders of magnitude of aforesaid method, its surface-area reaches 1.2 * 10
6Cm
2Big contact area like this, for the rapid absorption of gas provides favourable condition, so little bubble provides favourable condition for instantaneous the absorption fully, thereby the utilization ratio of oxygen is improved greatly, this is with regard to making the heavy-oxygen-enriched water for preparing rich oxygen content under the normal temperature and pressure expeditiously become possibility, and under the same operation condition, the heavy-oxygen-enriched water oxygen level that makes with method of the present invention is than in the past the high 200-300% of method.
Gas-liquid contact apparatus provided by the present invention is made of one or many contact assemblies, and the contact material in the gas-to-liquid contact assembly is a hydrophobic microporous membrane, and this is the essential characteristic of apparatus of the present invention.With polyethylene and polypropylene hollow fiber microporous membrane apparatus of the present invention accompanying drawing is illustrated below, but this illustrates limitation of the present invention absolutely not.Hollow-fibre membrane figuratively speaking is a thin-walled plastic pipe one by one, and external diameter is generally 0.3～0.5mm, wall thickness 0.02～0.05mm, the distribute aperture of 0.001～1.0 μ m of even tube wall, porosity 30～80%.
The effect of tackiness agent shown in Figure 1 is adhered to one another with reaching between fiber and the outer tube between fiber and the fiber, guarantees not seep water each other.Only represent with a hollow-fibre membrane schematically among Fig. 1 that in the practical application, an internal diameter is in the outer tube of 80mm, can encapsulate 2～30,000 hollow-fibre membranes, the membrane module that its huge specific surface area is other type hardly matches.Therefore, in many optional membrane modules, hollow fiber film assembly is selected in special recommendation of the present invention for use.Among Fig. 1-A, outer tube is a perforated tube.The effect one of perforated tube is the outline body of membrane module, the 2nd, and can make gas freely pass through.Perforated tube can be any metal tube, engineering plastics pipe that food sanitation requires that meet, also can be 5～200 μ m apertures macromolecular materials such as polyethylene, polyvinyl chloride sintered pipes or melt jet pipe.Among Fig. 1-B, outer tube is a non-perforated pipe.Material can be any metal tube, engineering plastics pipe that food sanitation requires that meet.The 1-A assembly, limit 4 is a liquid entrance.The 1-B assembly, 4 or 5 all can be used as liquid or gas inlet and outlet, are that liquid entrance is advisable with 4.
In Fig. 2, the external member material is a stainless steel, and 3 is the assembly shown in Fig. 1-A, with the sealing of " O " type circle, is plugged in the cylindrical shell many assembly parallel connections.1 is water intaking valve, and 8 is outlet valve, and 9 is water pressure gauge, regulates flooding quantity and hydraulic pressure with valve 1 and 8.2 is the oxygen supply valve, and 7 is purging valve, and the two is in order to regulate oxygen supply pressure.When oxygen supply pressure during greater than designated value, variable valve 7 suitable pressure releases.4 is oxygen manometer, and 5,6 is water drain valve, and 10 is stainless steel cylinder.In actual applications, valve 1 and service pump are linked, valve 8 can link with filling machine, and the water that valve 8 is discharged is heavy-oxygen-enriched water.Valve 2 is linked through oxygen surge tank and oxygen bottle.The adjustment water yield, hydraulic pressure, oxygen are depressed into required value, and device just can enter running status.When needing to stop, as long as shut-off valve 1,8 and oxygen bottle main valve get final product.
In Fig. 3, all pipe fittings are and meet the ABS pipe fitting that food sanitation requires, and support is a bar section of stainless steel, and 1 is water intaking valve, and 2 is the oxygen supply valve, and 3 is the membrane module shown in Fig. 1-B.In actual applications, can arrange the quantity of membrane module in parallel by the treatment capacity requirement.4 is oxygen manometer, and 5,6 is water drain valve, and 7 is purging valve, and 8 is outlet valve, and 9 is water pressure gauge.
Equipment shown in Figure 2, treatment capacity is with≤3m
3/ h is advisable.
Equipment shown in Figure 3 is suitable for the heavy-oxygen-enriched water factory of any treatment capacity.
The invention provides a kind of device for preparing heavy-oxygen-enriched water, comprise shell, inlet mouth, air outlet, fluid inlet, liquid outlet, microporous membrane, its characteristic is that microporous membrane made by hydrophobic material, is gas-liquid contact media with the film.
Microporous membrane is a membrane module described in the device provided by the invention, and this membrane module can be selected from hollow fiber film assembly, plate and frame membrane stack, rolling (or claiming wound form) assembly, collapsible assembly, tubular type or capillary type assembly.In addition, can connect by one or many membrane modules and constitute apparatus of the present invention according to the gas handled of require and/or amount of liquid.
The used porous-film of the present invention, material itself there is not strict restriction, as long as have hydrophobicity, nonpoisonous and tasteless when being used for drinkable water, there is good film forming characteristics to get final product, for example, can be selected from tetrafluoroethylene, polyvinylidene difluoride (PVDF), polysulfones, polyethersulfone, polyether sulphone, polyester, organo-silicone rubber, polyvinyl chloride, polyethylene, polypropylene or two or more polymer blending material.The present invention preferentially selects the polyethylene or the polypropylene of food grade for use, compares with other material, and low price not only, intensity is good, need not any additives promptly can be made into the microporous membrane that the present invention uses that is suitable for of high porosity.
The pore diameter range of film can be advisable with 0.01～1.0 μ m between 0.001～2.0 μ m.Membrane pore size is too big, and film strength is poor, sees through the bubble increase that film enters solution, and the gas-to-liquid contact area diminishes, and bigger bubble was difficult to dissolve fully in the moment that solution stream is crossed, and the utilization ratio of gas can reduce.The aperture of film too hour is difficult to make the film of high porosity, and porosity is the per-cent that the total area of fenestra accounts for the film total area, and porosity reduces can make the gas-to-liquid contact area reduce equally, unfavorable in gas-liquid mixed.
The porosity of film can be advisable with 30～50% between 10～80%.It is unfavorable when as mentioned above, porosity is low to gas-liquid mixed; Porosity is high more, and film strength is poor more, when porosity is too high, need add propping material, and this has increased trouble just for the system film.
The thickness of film can be between 20～1000 μ m, but are advisable with low.As long as available intensity can be arranged.For example, polyethylene film, polypropylene screen thickness can be between 20～50 μ m, and the thickness of film increases, and intensity improves, but the path of air penetrating film increases the resistance increase.
The geometrical shape of film can be selected from tubular fibre formula, board-like, capillary type or tubular type, has or not propping material all can.Wherein, with hollow-fibre membrane tamped density maximum, the equipment of unit volume can be gas-to-liquid contact maximum contact area is provided.Board-like film can be processed into rolling (claiming wound form again) assembly, also by bigger tamped density, but between film and the film separation net must be arranged, and difficulty of processing is bigger.Capillary type, tubular membrane tamped density are little, also can obtain than present method therefor effect preferably though use in the method for the invention, and be poor than hollow-fibre membrane.
The method for preparing microporous membrane is varied, for example, melt spun or be blow molded into basement membrane back draft pore, thermally induced phase separation, energetic ray punctures method, by behind mould material, membrane solvent, perforating agent and miscible spinning of other additive or the knifing in precipitation bath phase separation method or the like, these all are well-known to those skilled in the art.
The inventive method meets the basic law of gas dissolving fully.
Under low pressure, meet Henry's law, Gas Solubility is directly proportional with the pressure of gas.Pressure increases, and the solubleness of gas in solution increases.The present invention does not have any restriction to gaseous tension, desires to make the liquid of high gas content, and for example, the carbonated beverage can be brought up to 0.3～0.6MPa with air pressure.Be used to prepare heavy-oxygen-enriched water, oxygen pressure is brought up to 0.2MPa, oxygen level can be up to more than the 100mg/L.And current methods, for example use beverage mixer to carry out gas-liquid mixed, even pressure is increased to 0.2MPa equally, also need water temperature is reduced to 10 ℃, the oxygen level of gained heavy-oxygen-enriched water is 30mg/L only, it is worthy of note that the inventive method requires the gentle pressure of film two side hydraulic pressures in a basic balance, hydraulic pressure can be slightly larger than air pressure, but air pressure can not be greater than hydraulic pressure, otherwise after high pressure gas entered low pressure liquid, bubble volume can expand, gas density can reduce, be unfavorable for the absorption of liquid, still have not dissolved bubble, can reduce the concentration of dissolved gas in the solution and the effective rate of utilization of gas at liquid outlet to gas.
Along with increasing of temperature, the solubleness of gas in liquid can reduce, and this is in the certain methods that adopts now, sometimes for to make the heavy-oxygen-enriched water of oxygen level near 30mg/L, needs refrigerating apparatus to give the reason of water for cooling.The inventive method does not have strict restriction to fluid temperature, though also follow the temperature high more basic law of low solubility more, because this law has solved the well-mixed key issue of gas-liquid, therefore, under natural temperature, also can obtain satisfied result, for example, be used to prepare heavy-oxygen-enriched water, be under the condition of 0.1MPa at oxygen pressure, hydraulic pressure, it is 34.5 ℃ the oxygenation of purifying waste water, gained heavy-oxygen-enriched water oxygen level is 34.0mg/L, if seek out the more water of rich oxygen content, suitably supercharging gets final product.In like manner, if the temperature of natural water is higher, also can adopt the method for supercharging to improve dissolved oxygen amount.
Obviously, method and device that the present invention prepares heavy-oxygen-enriched water are different from prior art fully, and its advantage is that method is easy, and is with low cost, and oxygen content height in the product can be in normal-temperature operation.Certainly, those skilled in the art are not deviating from the present invention's spirit and are not exceeding under the scope of the invention situation, can do many improvement and variation, for example other selections of microporous membrane material, other selections of aperture and thickness, natural water or tap water and industrial oxygen are used in other changes of pressure and temperature, and the liquids and gases of other kinds or the like.
Embodiment
Embodiment one:
With external diameter is 0.4mm, wall thickness 0.035mm, and equivalent aperture 0.08 μ m, 7000 of the polyethylene hollow fiber microporous membranes of porosity 45% are packaged in the external diameter 65mm shown in Fig. 1-A, and wall thickness 8mm in the polyethylene sintered pipes of aperture 50 μ m, makes membrane module.With four parallel connections of above-mentioned membrane module,, be plugged in φ 300 * 1200mm stainless steel cylinder shown in Figure 2 with the sealing of " O " type circle.Water is by pump input hollow-fibre membrane inner chamber, and in the outside of film oxygen supply, two side hydraulic pressures of controlling diaphragm and oxygen press (gauge pressure, as follows) to be 0.1MPa, 32 ℃ of water temperatures, discharge 1m
3/ h, former water oxygen level 5.4mg/L, determinator exit heavy-oxygen-enriched water oxygen level is 52.4mg/L, is 9.7 times of former water.
Embodiment two:
Equipment is with example one, former water oxygen level 5.7mg/L, and 20 ℃ of water temperatures, all the other conditions are with example one, and it is 64.5mg/L that determinator goes out the saliva oxygen level, and more former water oxygen level improves 10.3 times.
Embodiment three:
It is external diameter 0.48mm that the used film of the membrane module of example one is changed, wall thickness 0.05mm, equivalent aperture 0.05 μ m, the polypropylene hollow fiber microporous membrane of porosity 38%.All the other conditions are with example two, and prepared heavy-oxygen-enriched water oxygen level is 60.5mg/L, and more former water improves 9.6 times.
Embodiment four:
Equipment is with example three, 17 ℃ of water temperatures, discharge 1.3m
3/ h, former water oxygen level 6.2mg/L, hydraulic pressure 0.1MPa, oxygen press 0.05MPa, and going out the saliva oxygen level is 43.0mg/L, is 6.9 times of former water.
Embodiment five:
In the ABS pipe that meets the food grade hygienic requirements of φ 90 * 1000mm, 25000 of the used hollow-fibre membranes of package example one are made membrane module, and the parallel connection of four this kind assemblies is assembled into as shown in Figure 3 heavy-oxygen-enriched water preparation facilities.Water intaking valve 1 is linked to each other with working shaft, advance oxygen valve 2 and link to each other with the oxygen surge tank, with 17 ℃ of water temperatures, the purifying waste water of oxygen level 6.2mg/L pumps in four assemblies in parallel, current in the hollow-fibre membrane cavity, variable valve 1 and valve 8, discharge is 6.4m
3/ h, hydraulic pressure are 0.05MPa, regulate oxygen and are depressed into 0.04MPa, and by outlet valve 8 sampling analysis, the water outlet oxygen level is 29.8mg/L, are 4.8 times of former water oxygen level.
Embodiment six:
With external diameter 0.4mm, wall thickness 0.03mm, equivalent aperture 0.03 μ m, 25000 of the polypropylene hollow fiber microporous membrane of porosity 40% are packaged in the ABS pipe identical with example five, make membrane module and identical heavy-oxygen-enriched water preparation facilities.With 19 ℃, the former water of oxygen level 6.0mg/L is under the 0.1MPa gauge pressure, with 3m
3The flow of/h pumps in the hollow-fibre membrane cavity, film outside oxygen supply, and oxygen is pressed 0.1MPa, and determining the saliva oxygen level is 59.4mg/L.
Embodiment seven:
Equipment therefor and test condition be with example six, and unique difference is that intake-outlet and air inlet/outlet are exchanged, i.e. aerating oxygen in the hollow-fibre membrane cavity, and outer water flowing, determining the saliva oxygen level is 42.1mg/L.
Embodiment eight:
Encapsulation external diameter 0.48mm in the identical ABS pipe of what and example five, wall thickness 0.05mm, equivalent aperture 0.05 μ m, 20000 of the polypropylene hollow fiber microporous membrane of porosity 38%, four identical membrane modules are assembled into heavy-oxygen-enriched water preparation facilities shown in Figure 3.With 19 ℃, the former water of oxygen level 6.0mg/L is with 2.06m
3The flow of/h pumps into the hollow-fibre membrane inboard, hydraulic pressure 0.05MPa.The outside oxygen supply of what film, oxygen are pressed and are 0.02MPa, and determining the saliva oxygen level is 37.0mg/L.
The method and apparatus that proposes with the present invention prepares heavy-oxygen-enriched water, and the oxygen level of water is higher by 100～200% than current methods.This law is simple to operate, is example with the preparation heavy-oxygen-enriched water, as long as a side oxygen supply of what film, current have just been realized the oxygen enrichmentization of water through the opposite side of film.
Use this law oxygenation, gas phase is disperseed at the liquid phase camber, and the gas-to-liquid contact area is big, and absorption rate is fast, as long as controlling diaphragm two side hydraulic pressures are pressed more than or equal to oxygen, does not just have the naked eyes visible bubble in bubble in the water and generates, and the utilization ratio of oxygen is near 100%; Use this law oxygenation, water temperature as long as suitable lifting oxygen is pressed, can keep water oxygen level constant during with the season lifting; Existing heavy-oxygen-enriched water preparation method is for the oxygen level that increases water need be given water for cooling, energy consumption height.Use this law to need not to reach identical or higher oxygen enrichment value to water for cooling.
Present device is totally-enclosed, and being absorbed gas can only move by film, and membrane pore size is far smaller than the bacterium size, therefore to the water non-secondary pollution.
Through the heavy-oxygen-enriched water of this law preparation, dissolved oxygen stable is good.For example: the heavy-oxygen-enriched water of can this law preparation in the polyester bottles of what 600ml, measure oxygen level 39mg/L during unpacking, drink half up after, the uncovered placement of room temperature (20 ℃) 3.5 hours measures that the water residual oxygen is 32mg/L in the bottle.The heavy-oxygen-enriched water of oxygen level 27.3mg/L is poured in the big bottle of 5 gallons of water dispensers and drink, after 24 hours, measure that the surplus water oxygen level is 20.1mg/L in the bottle, be equivalent to the oxygen level of present commercially available most heavy-oxygen-enriched waters.
Claims (7)
1. the preparation method of a heavy-oxygen-enriched water comprises and adopts the hydrophobic polymer microporous membrane, it is characterized in that making oxygen side by film under pressure, the opposite side of the film water of flowing through, the gentle pressing weighing apparatus of film two side hydraulic pressures.
2. according to the method for claim 1, it is characterized in that the hydrophobic film material is selected from the blended membrane material of tetrafluoroethylene, polyvinylidene difluoride (PVDF), polysulfones, polyethersulfone, polyether sulphone, polyester, silicon rubber, polyvinyl chloride, polypropylene and two or more polymkeric substance thereof.
3. according to the method for claim 1, the pore diameter range that it is characterized in that porous-film is 0.001-2.0 μ m, and thickness range is that porosity ranges is 10-80% between 20-1000 μ m.
4. according to the method for claim 1, it is characterized in that the geometrical configuration of film is selected from tubular fibre formula, board-like, capillary type.
5. device that adopts claim 1 method, this device is elementary cell with the membrane module, connect and compose this device by one or more membrane modules, described membrane module comprises shell, inlet mouth, air outlet, fluid inlet, liquid outlet, film, and inlet mouth connects source of oxygen, and the air outlet connects valve, fluid inlet connects water pump, liquid outlet connects the product filling machine, it is characterized in that described film is the hydrophobic polymer microporous membrane, is gas-liquid contact media with this film.
6. according to the device of claim 5, it is characterized in that described membrane module is selected from hollow fiber film assembly, plate and frame module, rolling assembly, collapsible assembly, tubular type or capillary type assembly.
7. according to the device of claim 5, it is characterized in that a plurality of membrane module parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97125836 CN1064935C (en) | 1997-12-25 | 1997-12-25 | Method and equipment for preparing oxygen-rich water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97125836 CN1064935C (en) | 1997-12-25 | 1997-12-25 | Method and equipment for preparing oxygen-rich water |
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|---|---|
| CN1200355A CN1200355A (en) | 1998-12-02 |
| CN1064935C true CN1064935C (en) | 2001-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 97125836 Expired - Fee Related CN1064935C (en) | 1997-12-25 | 1997-12-25 | Method and equipment for preparing oxygen-rich water |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1781362B (en) * | 2004-12-04 | 2010-09-08 | 福建省新视界环保科技发展有限公司 | New use of oxygen-enriched ecological active water in dry zero discharging cultivating high quality pig and dry pig pen structure |
| CN102908334A (en) * | 2012-11-15 | 2013-02-06 | 马克松 | Oxygen-contained capsule |
| CA2966886A1 (en) * | 2014-11-05 | 2016-05-12 | Max Mackenzie | Gas-infused fluids and methods of making and using same |
| JP2020175343A (en) * | 2019-04-19 | 2020-10-29 | 株式会社超微細科学研究所 | Aerator |
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Addressee: Yihua Oxygen-Enriched Water Equipment Co., Ltd., Huizhou City Document name: Notification of Termination of Patent Right |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |