CN113929226A - Oxalic acid waste liquid recovery system and recovery method - Google Patents
Oxalic acid waste liquid recovery system and recovery method Download PDFInfo
- Publication number
- CN113929226A CN113929226A CN202111268973.XA CN202111268973A CN113929226A CN 113929226 A CN113929226 A CN 113929226A CN 202111268973 A CN202111268973 A CN 202111268973A CN 113929226 A CN113929226 A CN 113929226A
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- oxalic acid
- nanofiltration
- acid waste
- filter
- waste liquid
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- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 title claims abstract description 328
- 235000006408 oxalic acid Nutrition 0.000 title claims abstract description 109
- 239000007788 liquid Substances 0.000 title claims abstract description 48
- 239000002699 waste material Substances 0.000 title claims abstract description 40
- 238000011084 recovery Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001728 nano-filtration Methods 0.000 claims abstract description 78
- 238000004064 recycling Methods 0.000 claims abstract description 23
- 239000002351 wastewater Substances 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000010936 titanium Substances 0.000 claims abstract description 12
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 13
- 238000011010 flushing procedure Methods 0.000 claims description 10
- 208000021302 gastroesophageal reflux disease Diseases 0.000 claims description 7
- 238000001223 reverse osmosis Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 20
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 239000010431 corundum Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- PIJPYDMVFNTHIP-UHFFFAOYSA-L lead sulfate Chemical compound [PbH4+2].[O-]S([O-])(=O)=O PIJPYDMVFNTHIP-UHFFFAOYSA-L 0.000 description 3
- BBJSDUUHGVDNKL-UHFFFAOYSA-J oxalate;titanium(4+) Chemical compound [Ti+4].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O BBJSDUUHGVDNKL-UHFFFAOYSA-J 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- QXDMQSPYEZFLGF-UHFFFAOYSA-L calcium oxalate Chemical compound [Ca+2].[O-]C(=O)C([O-])=O QXDMQSPYEZFLGF-UHFFFAOYSA-L 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- -1 titanium ions Chemical class 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The invention relates to an oxalic acid waste liquid recovery system, wherein oxalic acid is used for treating the surface of titanium, the oxalic acid waste liquid recovery system comprises an oxalic acid waste water collecting device, the output end of the oxalic acid waste water collecting device is connected with a booster pump, the booster pump is connected with a primary filtering device, the primary filtering device is connected with a nanofiltration high-pressure pump, the nanofiltration high-pressure pump is connected with a nanofiltration device, and the output end of the nanofiltration device is connected with the nanofiltration collecting device. A recovery system and a recovery method for oxalic acid waste liquid replace the traditional chemical method, have short process chain, avoid secondary pollution, and improve the recycling efficiency of oxalic acid by quickly recycling oxalic acid and using the technology in the field.
Description
Technical Field
The invention belongs to the technical field of waste liquid treatment, and relates to a system and a method for recovering oxalic acid waste liquid.
Background
Oxalic acid, is one of the simplest organic diacids. The structure is simplified as HOOCCOOH. It is colorless transparent crystal, harmful to human body, and can make the pH value in human body lose balance, and can affect development of children. Oxalic acid is often used for surface treatment of titanium substrates, the effect is superior to that of traditional inorganic acid, oxalic acid wastewater etched on the titanium substrates is an acidic mixed solution of oxalic acid and titanium oxalate, the content of organic matters is high, direct discharge has great impact on the environment, and huge economic and social values can be realized if an effective method is adopted for recycling the oxalic acid wastewater. At present, the conventional methods for recovering oxalic acid from oxalic acid wastewater are a lead sulfate method and a lime-gypsum method. The method for recovering oxalic acid by taking lead sulfate as an intermediate has the greatest defect that lead in oxalic acid recovery wastewater causes environmental pollution. In addition, the activity of lead sulfate is gradually reduced along with the increase of the use times, so that the yield of oxalic acid is low, and the production cost is increased. Although the problem of heavy metal lead pollution is solved by recovering oxalic acid by a lime-gypsum method, the obtained mixture of calcium oxalate and calcium sulfate is complex in the process of separating and recovering oxalic acid from the mixture of calcium oxalate and calcium sulfate, the recovery rate of oxalic acid is low, the recovery cost is high, and a large amount of waste water and waste residues are generated.
The traditional oxalic acid recovery process has many problems, and a new technology is urgently needed to be found to solve the defects. Therefore, the invention firstly proposes that the membrane technology is applied to the recycling of oxalic acid in the oxalic acid wastewater of titanium surface treatment, and the technology has short process chain and high recovery efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a system and a method for recovering oxalic acid waste liquid, replaces the traditional chemical method, has short process chain, avoids secondary pollution, quickly realizes the recycling of oxalic acid, is used for preparation at present and improves the recycling efficiency of oxalic acid.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an oxalic acid waste liquid recovery system, oxalic acid is used for handling the titanium surface, its characterized in that, oxalic acid waste liquid recovery system includes oxalic acid waste water collection device, oxalic acid waste water collection device's output is connected with the booster pump, the booster pump is connected with elementary filter equipment, elementary filter equipment is connected with the high-pressure pump of receiving nanofiltration, it is connected with the device of receiving nanofiltration to receive the high-pressure pump, receive the device output and receive the collection device and be connected with receiving nanofiltration.
Further, the primary filtering device comprises a bag filter, a safety filter and a precision filter which are connected in sequence; the filter material adopted by the bag filter, the cartridge filter and the precision filter is one of PP, UPVC, PVDF and FRP.
Furthermore, a nanofiltration membrane of the nanofiltration device is made of polypiperazine, and the membrane aperture of the nanofiltration membrane is 1 nm.
Furthermore, the nanofiltration collection device comprises a nanofiltration concentrated solution collection device and a nanofiltration recycling solution collection device.
Further, a cleaning device is connected between the nanofiltration device and the nanofiltration high-pressure pump, the cleaning device comprises a reverse osmosis device, and RO pure water prepared by the reverse osmosis device washes a high-molecular membrane of the nanofiltration device.
Further, the cleaning device also comprises a chemical cleaning tank.
Further, the nanofiltration device comprises at least two elements, and the output end of the nanofiltration device is also connected with an oxalic acid wastewater collection device.
The method for recovering the oxalic acid waste liquid is characterized by comprising the following steps of:
step 1, feeding oxalic acid waste liquid into a primary filter through a booster pump, and filtering out substances with the diameter larger than 0.1 mu m;
and 2, the oxalic acid liquid filtered by the primary filter enters a nanofiltration device through a nanofiltration high-pressure pump, and an oxalic acid concentrated solution, an oxalic acid recycling solution and an oxalic acid reflux solution are filtered after the oxalic acid liquid is filtered by the nanofiltration device.
Further, the step 1 specifically includes the following steps:
the oxalic acid waste liquid enters a bag filter through a booster pump, the filtering precision of the bag filter is 5 microns, and impurities with the diameter of more than 5 microns are intercepted; then entering a security filter, wherein the filtering precision of the security filter is 1-5 μm; and finally, the mixture enters a precision filter, and the filtering precision of the precision filter is 0.1-1 mu m.
Further, the recovery method also comprises a washing nanofiltration device, and specifically comprises the following steps:
closing the oxalic acid waste liquid inlet valve, opening a flushing valve and a flushing pump, and flushing the nanofiltration device by RO water prepared by the RO device; and when the quality of the oxalic acid reflux liquid is reduced to be below the standard value during operation, the nano-filtration device is washed by HCl solution in the chemical cleaning tank.
Compared with the prior art, the invention has the following beneficial effects:
a recovery system and a recovery method for oxalic acid waste liquid replace the traditional chemical method, have short process chain, avoid secondary pollution, and improve the recycling efficiency of oxalic acid by quickly recycling oxalic acid and using the technology in the field.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a structural diagram of an oxalic acid waste liquid recovery system of the present invention;
FIG. 2 is a working block diagram of an oxalic acid waste liquid recovery system of the present invention;
wherein: 1. an oxalic acid wastewater collection device; 2. a booster pump; 3. a bag filter; 4. a cartridge filter; 5. a precision filter; 6. a nanofiltration high-pressure pump; 7. a cleaning device; 8. a nanofiltration device; 9. a nanofiltration concentrate collection device; 10. nanofiltration recycling liquid collecting device.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.
Examples
The utility model provides an oxalic acid waste liquid recovery system, oxalic acid is used for handling the titanium surface, and oxalic acid waste liquid recovery system includes oxalic acid waste water collection device 1, and oxalic acid waste water collection device 1's output is connected with booster pump 2, and booster pump 2 is connected with elementary filter equipment, and elementary filter equipment is connected with nanofiltration high-pressure pump 6, and nanofiltration high-pressure pump 6 is connected with nanofiltration device 8, and nanofiltration device 8 output is connected with nanofiltration collection device. The primary filtration device comprises a bag filter 3, a security filter 4 and a precision filter 5 which are connected in sequence. The nanofiltration device 8 comprises at least two elements, and the output end of the nanofiltration device is also connected with the oxalic acid wastewater collection device 1. The filter material adopted by the bag filter 3, the cartridge filter 4 and the precision filter 5 is one of PP, UPVC, PVDF and FRP.
Preferably, the nanofiltration membrane of the nanofiltration device is made of polypiperazine, and the membrane aperture of the nanofiltration membrane is 1 nm.
The nanofiltration collecting device comprises a nanofiltration concentrated solution collecting device 9 and a nanofiltration recycling solution collecting device 10. And a cleaning device 7 is connected between the nanofiltration device 8 and the nanofiltration high-pressure pump 6, the cleaning device 7 comprises a reverse osmosis device, RO pure water prepared by the reverse osmosis device is used for washing a high molecular membrane of the nanofiltration device 8, and the cleaning device further comprises a chemical cleaning tank.
The recovery of the oxalic acid waste liquid is realized by the following steps:
step 1, the oxalic acid waste liquid enters a bag filter through a booster pump, the filtering precision of the bag filter is 5 microns, impurities with the diameter of more than 5 microns are intercepted, specifically steel sand particles, brown corundum particles, white corundum particles, titanium slag particles, oil stains and the like, the bag filter is made of PP, and a PP filter bag is arranged in the bag filter;
then the mixture enters a security filter, the filtering precision of the security filter is 1-5 mu m, and the fine steel grit powder, brown corundum powder, white corundum powder, titanium slag powder, oil stain and the like are specifically filtered, the security filter is made of FRP, and a folding PP filter element is arranged in the security filter;
and then entering a precision filter, wherein the filtering precision of the precision filter is 0.1-1 mu m, oil stains, titanium ions and titanium oxalate suspended matters are specifically filtered, the filter is made of FRP, and a folding PP filter element is arranged in the filter.
The nanofiltration system comprises 0-600L/h of oxalic acid concentrated solution and 0-4 m of oxalic acid recycling solution3H, 0-16 m of oxalic acid reflux3And h, controlling the flow of the oxalic acid recycling liquid by regulating and controlling the flow of the oxalic acid concentrated solution and the oxalic acid circulating liquid.
And 2, the oxalic acid liquid filtered by the primary filter enters a nanofiltration device 8 through a nanofiltration high-pressure pump 6, and an oxalic acid concentrated solution, an oxalic acid recycling solution and an oxalic acid reflux solution are filtered out after the filtration treatment of the nanofiltration device 8. One part of the oxalic acid concentrated solution is collected in the nanofiltration concentrated solution collecting device, and the other part of the oxalic acid concentrated solution flows into the oxalic acid wastewater collecting device as circulating liquid.
The data pair ratio before and after the oxalic acid recycling is shown in table 1, and the operating parameters of the oxalic acid recycling system are shown in table 2:
TABLE 1 comparison of data before and after oxalic acid recycle
TABLE 2 oxalic acid Recycling System operating parameters
From the table 1, the nano-filtration system can realize the separation of titanium oxalate in the oxalic acid waste liquid, more than 65% of oxalic acid is recycled, and the content of titanium ions in the recycled oxalic acid is reduced to 110mg/L (1200 mg/L of the oxalic acid waste liquid), so that the etching capacity of the recycled oxalic acid on the titanium plate is ensured. Meanwhile, as can be seen from the table 2, the system runs stably, the existing preparation of oxalic acid is realized, and the recycling efficiency is improved.
The recovery method also comprises a flushing nanofiltration device, which comprises the following steps:
after the operation of the nanofiltration system is finished, closing the oxalic acid waste liquid inlet valve, opening the flushing valve and the flushing pump until the oxalic acid waste liquid inlet valve is flushed completely, performing RO pure water flushing on the nanofiltration system after each operation, and preparing RO water by the reverse osmosis device to flush the nanofiltration device to prevent pollutants from fouling the surface of the membrane; when the quality of the oxalic acid reflux liquid drops below a standard value during operation, the nanofiltration device is washed by 5 percent HCl solution in a chemical cleaning tank.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The utility model provides an oxalic acid waste liquid recovery system, the oxalic acid is used for handling the titanium surface, its characterized in that, oxalic acid waste liquid recovery system includes oxalic acid waste water collection device (1), the output and booster pump (2) of oxalic acid waste water collection device (1) are connected, booster pump (2) are connected with elementary filter equipment, elementary filter equipment is connected with nanofiltration high-pressure pump (6), nanofiltration high-pressure pump (6) are connected with nanofiltration device (8), nanofiltration device (8) output is connected with nanofiltration collection device.
2. An oxalic acid waste liquor recovery system according to claim 1, characterized in that, the primary filtering device comprises a bag filter (3), a security filter (4) and a precision filter (5) which are connected in sequence.
3. The system for recycling the oxalic acid waste liquid according to the claim 2, characterized in that the filter material adopted by the bag filter (3), the cartridge filter (4) and the precise filter (5) is one of PP, UPVC, PVDF and FRP; the nanofiltration collection device comprises a nanofiltration concentrated solution collection device (9) and a nanofiltration recycling solution collection device (10).
4. The oxalic acid waste liquid recovery system according to claim 1, wherein the nanofiltration membrane of the nanofiltration device (8) is made of polypiperazine, and the pore diameter of the nanofiltration membrane is 1 nm.
5. An oxalic acid waste liquid recovery system according to claim 1, characterized in that between the nanofiltration device (8) and the nanofiltration high pressure pump (6) is connected a cleaning device (7), the cleaning device (7) comprises a reverse osmosis device, the reverse osmosis device uses RO pure water to wash the polymeric membrane of the nanofiltration device (8).
6. The system for recycling waste oxalic acid solution according to claim 5, wherein said cleaning device further comprises a chemical cleaning tank.
7. An oxalic acid waste liquid recovery system according to claim 1, characterized in that, the nanofiltration device (8) comprises at least two components, and the output end of the nanofiltration device is connected with the oxalic acid waste water collection device (1).
8. The method for recovering the oxalic acid waste liquid according to claim 1, comprising the steps of:
step 1, feeding oxalic acid waste liquid into a primary filter through a booster pump, and filtering out substances with the diameter larger than 0.1 mu m;
and 2, the oxalic acid liquid filtered by the primary filter enters a nanofiltration device (8) through a nanofiltration high-pressure pump (6), and is filtered by the nanofiltration device (8) to obtain an oxalic acid concentrated solution, an oxalic acid recycling solution and an oxalic acid reflux solution.
9. The method for recovering the oxalic acid waste liquid according to claim 8, wherein the step 1 specifically comprises the following steps:
the oxalic acid waste liquid enters a bag filter through a booster pump, the filtering precision of the bag filter is 5 microns, and impurities with the diameter of more than 5 microns are intercepted; then entering a security filter, wherein the filtering precision of the security filter is 1-5 μm; and finally, the mixture enters a precision filter, and the filtering precision of the precision filter is 0.1-1 mu m.
10. The method for recovering the oxalic acid waste liquid according to claim 9, wherein the method further comprises a washing and nanofiltration device, which comprises the following steps:
closing the oxalic acid waste liquid inlet valve, opening a flushing valve and a flushing pump, and flushing the nanofiltration device by RO water prepared by the RO device; and when the quality of the oxalic acid reflux liquid is reduced to be below the standard value during operation, the nano-filtration device is washed by HCl solution in the chemical cleaning tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111268973.XA CN113929226A (en) | 2021-10-29 | 2021-10-29 | Oxalic acid waste liquid recovery system and recovery method |
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| CN202111268973.XA CN113929226A (en) | 2021-10-29 | 2021-10-29 | Oxalic acid waste liquid recovery system and recovery method |
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| CN1524841A (en) * | 2003-09-18 | 2004-09-01 | 周建华 | Method for reclaiming calcium oxalate from sewage comprising oxalic acid |
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| JP2005325082A (en) * | 2004-05-17 | 2005-11-24 | Nippon Rensui Co Ltd | Method for recovering highly pure oxalic acid aqueous solution |
| CN102935298A (en) * | 2012-11-28 | 2013-02-20 | 湖北益泰药业有限公司 | Method for recovering refined oxalate mother liquor |
| CN108774125A (en) * | 2018-05-28 | 2018-11-09 | 苏州澄江环境科技有限公司 | A kind of technique recycling raw material from gulonic acid mother solution |
| CN113045054A (en) * | 2021-04-27 | 2021-06-29 | 西安泰瑞环保技术有限公司 | Device and method for efficiently recovering oxalic acid from titanium oxalate waste liquid |
-
2021
- 2021-10-29 CN CN202111268973.XA patent/CN113929226A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005034749A (en) * | 2003-07-15 | 2005-02-10 | Jfe Engineering Kk | Treatment method of acid washing waste liquid for filter membrane module and treatment facility |
| CN1524841A (en) * | 2003-09-18 | 2004-09-01 | 周建华 | Method for reclaiming calcium oxalate from sewage comprising oxalic acid |
| JP2005325082A (en) * | 2004-05-17 | 2005-11-24 | Nippon Rensui Co Ltd | Method for recovering highly pure oxalic acid aqueous solution |
| CN102935298A (en) * | 2012-11-28 | 2013-02-20 | 湖北益泰药业有限公司 | Method for recovering refined oxalate mother liquor |
| CN108774125A (en) * | 2018-05-28 | 2018-11-09 | 苏州澄江环境科技有限公司 | A kind of technique recycling raw material from gulonic acid mother solution |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 710299 No. 15, west section of Xijin Road, Jingwei Industrial Park, Xi'an Economic and Technological Development Zone, Xi'an City, Shaanxi Province Applicant after: Xi'an Taijin Xinneng Technology Co.,Ltd. Applicant after: Xi'an Tairui Environmental Protection Technology Co.,Ltd. Address before: No.15, west section of Xijin Road, Jingwei Industrial Park, Xi'an Economic and Technological Development Zone, Xi'an City, Shaanxi Province 710201 Applicant before: XI'AN TAIJIN INDUSTRIAL ELECTROCHEMICAL TECHNOLOGY Co.,Ltd. Applicant before: Xi'an Tairui Environmental Protection Technology Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220114 |