CN116531931A - Formaldehyde purifying agent and preparation method thereof - Google Patents
Formaldehyde purifying agent and preparation method thereof Download PDFInfo
- Publication number
- CN116531931A CN116531931A CN202310337509.4A CN202310337509A CN116531931A CN 116531931 A CN116531931 A CN 116531931A CN 202310337509 A CN202310337509 A CN 202310337509A CN 116531931 A CN116531931 A CN 116531931A
- Authority
- CN
- China
- Prior art keywords
- carrier
- formaldehyde
- active substance
- formaldehyde scavenger
- purifying agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000012629 purifying agent Substances 0.000 title abstract description 23
- 239000013543 active substance Substances 0.000 claims abstract description 22
- HVBSAKJJOYLTQU-UHFFFAOYSA-N 4-aminobenzenesulfonic acid Chemical compound NC1=CC=C(S(O)(=O)=O)C=C1 HVBSAKJJOYLTQU-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229950000244 sulfanilic acid Drugs 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 22
- 238000001179 sorption measurement Methods 0.000 claims description 16
- 239000002516 radical scavenger Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 10
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- 150000007514 bases Chemical class 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000011149 active material Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000005909 Kieselgur Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910021536 Zeolite Inorganic materials 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 239000010457 zeolite Substances 0.000 claims description 2
- 238000004887 air purification Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 238000012360 testing method Methods 0.000 description 11
- 238000003756 stirring Methods 0.000 description 8
- KSVSZLXDULFGDQ-UHFFFAOYSA-M sodium;4-aminobenzenesulfonate Chemical compound [Na+].NC1=CC=C(S([O-])(=O)=O)C=C1 KSVSZLXDULFGDQ-UHFFFAOYSA-M 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000005303 weighing Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- DAXJNUBSBFUTRP-RTQNCGMRSA-N (8r,9s,10r,13s,14s)-6-(hydroxymethyl)-10,13-dimethyl-7,8,9,11,12,14,15,16-octahydro-6h-cyclopenta[a]phenanthrene-3,17-dione Chemical compound O=C1C=C[C@]2(C)[C@H]3CC[C@](C)(C(CC4)=O)[C@@H]4[C@@H]3CC(CO)C2=C1 DAXJNUBSBFUTRP-RTQNCGMRSA-N 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 206010020751 Hypersensitivity Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 208000026935 allergic disease Diseases 0.000 description 1
- 230000007815 allergy Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000036737 immune function Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000003905 indoor air pollution Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000004199 lung function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000051 modifying effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- LDZHTQSBXDDUFB-UHFFFAOYSA-M potassium;4-aminobenzenesulfonate Chemical compound [K+].NC1=CC=C(S([O-])(=O)=O)C=C1 LDZHTQSBXDDUFB-UHFFFAOYSA-M 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000378 teratogenic Toxicity 0.000 description 1
- 230000003390 teratogenic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a formaldehyde purifying agent and a preparation method thereof, and relates to the field of air purification. The formaldehyde purifying agent comprises: a carrier; an active substance distributed on the carrier, the active substance comprising at least one of sulfanilic acid and sulfanilic acid salt. The formaldehyde purifying agent can quickly and effectively adsorb and remove formaldehyde at normal temperature, and can also effectively remove VOC gas.
Description
Technical Field
The invention relates to the field of air purification, in particular to a formaldehyde purifying agent and a preparation method thereof.
Background
Formaldehyde is one of the main pollutants for indoor air pollution, has the characteristics of large toxicity, wide sources, long release time and the like, and has the effects on human health, such as abnormal smell, stimulation, allergy, abnormal lung function, abnormal immune function, influenced central nervous system and damaged genetic materials in cells, and is determined to be carcinogenic and teratogenic materials by the world health organization.
In the related art, methods for treating formaldehyde mainly include a physical adsorption method, a chemical reaction method, a photocatalysis technology and the like. The physical adsorption method has the defects of saturated adsorption, easy desorption and the like. The chemical reaction method has the defects of secondary pollution, limited service life and the like. Photocatalytic technology typically requires ultraviolet light for illumination, which is costly and presents an unsafe factor for people and objects in the room.
Therefore, a material capable of effectively solving the problem of indoor formaldehyde pollution is needed.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the formaldehyde purifying agent which can effectively remove formaldehyde at normal temperature.
The invention also provides a preparation method of the formaldehyde purifying agent.
The invention also provides a filter screen comprising the formaldehyde scavenger.
The invention also provides application of the formaldehyde purifying agent or the filter screen.
A formaldehyde scavenger according to an embodiment of the first aspect of the present invention, the formaldehyde scavenger comprising:
a carrier;
an active substance distributed on the carrier, the active substance comprising at least one of sulfanilic acid and sulfanilic acid salt.
The formaldehyde purifying agent provided by the embodiment of the invention has at least the following beneficial effects:
the formaldehyde purifying agent can quickly and effectively adsorb and remove formaldehyde at normal temperature through physical adsorption and chemical reaction, can effectively remove VOC gas, and can be used as an effective formaldehyde adsorption and decomposition material. Active substances can be well adsorbed on the surface of the carrier, and the carrier is modified. The active substance is capable of reacting with formaldehyde and adsorbing it on a carrier (formaldehyde can react with-NH on the active substance 2 Combine to form-NH-CH 2 OH or-N (CH) 2 -OH) 2 And the hydroxymethyl derivative and water), thereby effectively improving the formaldehyde removal efficiency of the carrier, being not easy to generate secondary pollution, and effectively prolonging the service life of the formaldehyde purifying agent by 15-20 percent compared with the prior other formaldehyde purifying agents. According to some embodiments of the invention, the active substance is 1% to 25% of the mass of the carrier. Preferably 5% -15%; more preferably 8 to 12%.
According to some embodiments of the invention, the sulfanilic acid salt includes at least one of sodium sulfanilic acid salt, potassium sulfanilic acid salt.
According to some embodiments of the invention, the carrier comprises at least one of activated carbon, zeolite, diatomaceous earth.
According to some embodiments of the invention, the specific surface area of the carrier is greater than or equal to 1000m 2 And/g. Preferably 1000m 2 /g～1500m 2 /g。
According to some embodiments of the invention, the carrier has a particle size of 10 mesh to 20 mesh.
According to some embodiments of the invention, the formaldehyde scavenger has a water content of no more than 20%. Preferably 8 to 20%. More preferably 8 to 16%. Thus, the baking time can be reduced, and the formaldehyde removal is facilitated, and the storage and the use of the formaldehyde remover are facilitated.
According to some embodiments of the invention, the activated carbon includes, but is not limited to, coal activated carbon, wood activated carbon, fruit shell activated carbon, coconut shell activated carbon.
A method for preparing a formaldehyde scavenger according to an embodiment of the second aspect of the present invention includes the steps of:
impregnating the carrier with an aqueous solution containing the active substance and baking.
The preparation method provided by the embodiment of the invention has at least the following beneficial effects:
the preparation method of the embodiment modifies the activated carbon by an isovolumetric impregnation method, has simple and feasible process, and has low-cost and easily-obtained raw materials, good application value and application prospect.
According to some embodiments of the invention, the amount of water in the aqueous solution is not higher than the water saturation adsorption volume of the carrier. The volume ratio of water in the aqueous solution to the water saturation adsorption volume of the carrier is 0.5-1: 1.
according to some embodiments of the invention, the water saturated adsorption volume is 50% to 100% of the support volume. The water solution containing the active substances is measured according to the water saturation adsorption volume, so that the waste water generated in the production process can be reduced.
According to some embodiments of the invention, the preparation method may specifically comprise the steps of:
s1, measuring the water saturation adsorption volume of the carrier, and weighing the carrier;
s2, measuring an aqueous solution containing active substances according to the water saturation adsorption volume measured in the step S1;
s3, mixing the aqueous solution with the carrier, standing and baking.
According to some embodiments of the invention, in step S1, the method for measuring the water saturation adsorption volume is: and adding V1 mL of water into the carrier, immersing, uniformly stirring, pouring out the water after water absorption is saturated, and weighing the volume V2 mL of the poured water, wherein V1-V2 is the water saturation adsorption volume of the carrier.
According to some embodiments of the invention, the aqueous solution further comprises a basic compound. The basic compound has strong basicity.
According to some embodiments of the invention, the alkaline compound comprises at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide.
According to some embodiments of the invention, the mass ratio of the basic compound to the active substance is 1:5 to 15. Thus, the dissolution of the active material is facilitated, and the modifying effect of the active material on the carrier can be improved. The basic compound is used to promote dissolution of the active substance, facilitating the binding between the active substance and the carrier.
According to some embodiments of the invention, the stirring time is between 10min and 30min.
According to some embodiments of the invention, the time of resting is 20min to 40min.
According to some embodiments of the invention, the baking time is 1h to 2h.
According to some embodiments of the invention, the baking temperature is 80-120 ℃.
According to a third aspect of the invention, a filter screen is provided, comprising a formaldehyde scavenger according to the first aspect of the invention. The filter screen adopts all the technical schemes of the formaldehyde purifying agent in the embodiment, so that the formaldehyde purifying agent has at least all the beneficial effects brought by the technical schemes in the embodiment.
The use of the formaldehyde scavenger or filter screen described above in the purification of air according to the fourth aspect of the present invention.
According to some embodiments of the invention, the purifying the air includes at least one of purifying formaldehyde, purifying VOC gas.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the description of the present invention, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
If not specified, the normal temperature in the invention means 25+/-5 ℃.
In the following examples, the columnar porous activated carbon used was HES series activated carbon available from Fujian Yuan Lian activated carbon Co., ltd., and had a specific surface area of 1000m 2 And/g, particle size of 2mm. Per 100g columnar porous ActivityThe water adsorption volume of the char was 60mL.
Example 1
The embodiment provides a formaldehyde purifying agent, which comprises a carrier and an active substance, wherein the carrier is columnar porous active carbon, and the active substance is sulfanilic acid; the sulfanilic acid accounts for 10 weight percent of the columnar porous active carbon. The preparation method of the formaldehyde purifying agent comprises the following steps:
s1, weighing 10g of sulfanilic acid, adding 50g of water, and stirring until the sulfanilic acid is completely dissolved to obtain a sulfanilic acid solution.
S2, pouring the sulfanilic acid solution into a container filled with 100g of columnar porous active carbon while stirring, stirring for 30min, and standing for 30min.
And S3, taking out the columnar porous activated carbon treated in the step S2, tiling, and baking at 105 ℃ for 1h to obtain the formaldehyde purifying agent (the water content is 12%).
Example 2
The embodiment provides a formaldehyde purifying agent, which comprises a carrier and an active substance, wherein the carrier is columnar porous active carbon, and the active substance is sodium sulfanilate; the sodium sulfanilate is 10wt% of the columnar porous active carbon. The preparation method of the formaldehyde purifying agent comprises the following steps:
s1, weighing 10g of sodium sulfanilate and 1g of sodium hydroxide, adding 50g of water, and stirring until the sodium sulfanilate and the sodium hydroxide are completely dissolved to obtain a sodium sulfanilate solution.
S2, pouring the sodium sulfanilate solution into a container filled with 100g of columnar porous active carbon while stirring, stirring for 30min, and standing for 30min.
And S3, taking out the columnar porous activated carbon treated in the step S2, tiling, and baking at 105 ℃ for 1h to obtain the formaldehyde purifying agent (the water content is 14%).
Test case
The formaldehyde purifying agent prepared in the embodiment 1-2 is prepared into a filter screen (specifically, the formaldehyde purifying agent is stuck on a plastic honeycomb to be made into a flat filter core), and the method is characterized in that according to the national standard GB/T18801-2015 air purifier and GB/T18204.2-2014 public place sanitation inspection method part 2: the method in chemical pollutant was used to measure the formaldehyde filtration efficiency of the filter screen and the air purifier high efficiency filter element (modified activated carbon filter element, product number 6110100076, provided by Jieding filtration products Co., ltd.). The test method is as follows:
the volume of the test cabin is 30m 3 The temperature of the test cabin is (25+/-2), the humidity of the test cabin is (50+/-10)% RH, and the test process starts the 'highest wind speed' and the 'negative ion' for detection.
Filtration efficiency of formaldehyde= (initial concentration of formaldehyde-concentration of formaldehyde after test)/initial concentration of formaldehyde.
And testing the corresponding VOC gas removal rate. The test method is as follows:
5mg/m of the mixture was injected into a 30L sealed chamber 3 Is prepared by adding a test sample containing 1g of modified activated carbon to the cabin, testing the residual VOC gas concentration after 1h, and recording the data.
VOC gas removal rate= (VOC initial concentration-post-test VOC concentration)/VOC initial concentration.
The test results are shown in Table 1.
TABLE 1
The embodiments of the present invention have been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (10)
1. A formaldehyde scavenger, the formaldehyde scavenger comprising:
a carrier;
an active substance distributed on the carrier, the active substance comprising at least one of sulfanilic acid and sulfanilic acid salt.
2. The formaldehyde scavenger according to claim 1, wherein the active substance is 1% -25% of the mass of the carrier.
3. The formaldehyde scavenger according to claim 1, wherein the carrier comprises at least one of activated carbon, zeolite, diatomaceous earth;
preferably, the specific surface area of the carrier is more than or equal to 1000m 2 /g。
4. A process for the preparation of a formaldehyde scavenger according to any one of claims 1 to 3, characterized by comprising the steps of:
impregnating the carrier with an aqueous solution containing the active substance and baking.
5. The method according to claim 4, wherein the aqueous solution is used in an amount not higher than the water-saturated adsorption volume of the carrier;
preferably, the volume ratio of the aqueous solution to the water-saturated adsorption volume of the carrier is 0.5 to 1:1.
6. the method of claim 4, wherein the aqueous solution further comprises a basic compound;
preferably, the alkaline compound includes at least one of sodium hydroxide, potassium hydroxide, and lithium hydroxide.
7. The method according to claim 6, wherein the mass ratio of the alkaline compound to the active material is 1:5 to 15.
8. The method according to claim 4, wherein the baking temperature is 80 to 120 ℃.
9. A filter screen comprising the formaldehyde scavenger according to any one of claims 1 to 3.
10. Use of a formaldehyde scavenger according to any one of claims 1 to 3 or a filter screen according to claim 9 for purifying air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310337509.4A CN116531931A (en) | 2023-03-31 | 2023-03-31 | Formaldehyde purifying agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310337509.4A CN116531931A (en) | 2023-03-31 | 2023-03-31 | Formaldehyde purifying agent and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116531931A true CN116531931A (en) | 2023-08-04 |
Family
ID=87444303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310337509.4A Pending CN116531931A (en) | 2023-03-31 | 2023-03-31 | Formaldehyde purifying agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116531931A (en) |
-
2023
- 2023-03-31 CN CN202310337509.4A patent/CN116531931A/en active Pending
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