CN104741002A - Method for removing formaldehyde in air at room temperature by regenerating invalid oxidant in situ - Google Patents
Method for removing formaldehyde in air at room temperature by regenerating invalid oxidant in situ Download PDFInfo
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- CN104741002A CN104741002A CN201510163025.8A CN201510163025A CN104741002A CN 104741002 A CN104741002 A CN 104741002A CN 201510163025 A CN201510163025 A CN 201510163025A CN 104741002 A CN104741002 A CN 104741002A
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- formaldehyde
- air
- oxidant
- metal oxide
- room temperature
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Abstract
The invention discloses a method for removing formaldehyde in air at a room temperature by regenerating an invalid oxidant in situ. The method comprises the following steps sequentially and circularly: a, enabling the air containing the formaldehyde to pass through a metal oxide purification layer used as a formaldehyde removing oxidant; b, detecting the purified air and judging whether the air contains the formaldehyde or not; and c, if the purified air contains the formaldehyde, stopping the air containing the formaldehyde from passing through the metal oxide purification layer and enabling ozone gas to flow through the metal oxide purification layer for 5-100 minutes, wherein the ozone volume percent concentration of the ozone gas is 0.01%-1%, the relative humidity is 20%-90% and the airspeed is 5000/h-100000/h. The oxidant can be used circularly and the formaldehyde removing cost is reduced.
Description
Technical field
The invention belongs to technical field of air purification, particularly relate to a kind of oxidant can be recycled, reduce room temperature of methanal removing cost and remove the method for formaldehyde in air.
Background technology
Formaldehyde is generally acknowledged allergen, is also one of potential strong mutagen, very harmful to human body, is classified as carcinogenic by the World Health Organization and causes deformed material.Because formaldehyde can constantly slowly release in decorating and renovating material indoor, release period generally reaches 15 years, there is the feature of extended residual, therefore the concentration of countries in the world to formaldehyde in indoor air has made very strict regulation, and in China's regulation indoor air, concentration of formaldehyde permissible value is 0.08 mg/m
3.
Formaldehyde molecule has the chemical property of strong reducing property, be therefore harmless carbon dioxide and water by formaldehyde complete oxidation is the effective method of one removing formaldehyde.But, if at room temperature utilize oxygen molecule in air oxidation of formaldehyde to be removed, only could realize under the catalytic action of precious metals pt or Au (
catalysis Communications, 2005,6:211-214;
applied Catalysis B:Environmental, 2013,132-133:245-255), the expensive cost of noble metal catalyst limits applying of this method.At present, some metal oxide (as manganese dioxide, cupric oxide, ceria, iron oxide etc.) also can be used as the oxidant removing formaldehyde, at room temperature oxidation of formaldehyde is removed (Atmospheric Environment, 2002,36:5543-5547).One of concrete processing method is with active A l
2o
3, SiO
2or the porous material such as molecular sieve is carrier, the shape of carrier can adopt graininess or foam, honeycomb monolith structures.Infusion process, ion-exchange or oxidation-reduction method is adopted to obtain the support type oxidant removing formaldehyde.Support type oxidant being placed in clarifier as purifying layer, making containing formaldehyde air initiatively or be additionally related to multi-functional passive entry oxidizing agent scavenging layer, is harmless carbon dioxide and water by the formaldehyde complete oxidation flowed through in air then.But along with the carrying out of reaction, metal oxide will be reduced and lose efficacy after shorter service time, can only add new metal oxide by abandoned well, cause methanal removing cost higher.
Summary of the invention
The present invention is the above-mentioned technical problem in order to solve existing for prior art, provides a kind of oxidant can be recycled, reduces the method that the room temperature of methanal removing cost removes formaldehyde in air.
Technical solution of the present invention is: a kind of method making the room temperature of deactivated oxidizing agent in-situ regeneration remove formaldehyde in air, it is characterized in that circulating successively and carries out following steps:
A. make to pass as the metal oxide purifying layer removing oxidation of formaldehyde agent containing formaldehyde air;
B. the air through purification is detected, judge whether containing formaldehyde?
C. as contained formaldehyde through the air of purification, then stop containing formaldehyde air through metal oxide purifying layer, the ozone concentration of volume percent simultaneously ozone gas being flowed through metal oxide purifying layer 5 ~ 100 minutes described ozone gas is 0.01 ~ 1%, relative humidity is 20% ~ 90%, and air speed is 5000 ~ 100000 h
-1.
The present invention not only can utilize metal oxide to remove formaldehyde in air pollutant at ambient temperature, and the oxidant in-situ regeneration of inefficacy is made at ambient temperature by ozone, ozone decomposed is oxygen simultaneously, do not produce secondary pollution, achieve recycling of metal oxide, simple to operate, reduce the cost removing formaldehyde.
Detailed description of the invention
Embodiment 1:
A., equi-volume impregnating is adopted volume required manganese nitrate solution to be impregnated in the spherical active A l of diameter 1 mm
2o
3on carrier, hold over night.Then, through 110 DEG C of dry 6h and 500 DEG C roasting 4h, obtained percentage by weight is the 10% support type MnO removing formaldehyde
2/ Al
2o
3oxidant.Measure above-mentioned made support type MnO
2/ Al
2o
3oxidant 1ml, fills in the quartz glass tube type clarifier of internal diameter 8mm.At room temperature, by containing the air draught of 15 ppm formaldehyde with the traffic flow of 450ml/min through clarifier;
B. in clarifier outlet, by the air of infrared gas analyser on-line checkingi through purification, judge whether containing formaldehyde? as only CO detected
2, formaldehyde do not detected, support type MnO be described
2/ Al
2o
3oxidant is effective; Otherwise support type MnO is described
2/ Al
2o
3oxidant lost efficacy;
C. after testing result shows reaction 120 min, in clarifier exit gas, there is formaldehyde to detect, show support type MnO
2/ Al
2o
3oxidant starts to lose efficacy, and stops containing formaldehyde air through support type MnO
2/ Al
2o
3oxidizing agent scavenging layer, switches to ozone gas by the inlet gas of clarifier simultaneously, makes ozone gas with the flow of 300ml/min, flows through support type MnO
2/ Al
2o
3oxidizing agent scavenging layer 30 minutes, described ozone gas take air as Balance Air, and ozone concentration is 0.015%, and relative humidity is 50%, and air speed is 18000 h
-1.
Then, the inlet gas of clarifier is switched to the above-mentioned air draught containing formaldehyde, then by the air of infrared gas analyser on-line checkingi through purification, testing result only CO detected
2,formaldehyde do not detected, show support type MnO
2/ Al
2o
3the performance that removes of oxidant is restored.
Embodiment 2:
A., equi-volume impregnating is adopted volume required copper nitrate solution to be impregnated in the spherical SiO of diameter 1 mm
2on carrier, hold over night.Then, through 110 DEG C of dry 6h and 400 DEG C roasting 4h, obtained percentage by weight is the 15% support type CuO/SiO removing formaldehyde
2oxidant.Measure above-mentioned made support type CuO/SiO
2oxidant 1ml, fills in the quartz glass tube type clarifier of internal diameter 8mm.At room temperature, by containing the air draught of 15 ppm formaldehyde with the traffic flow of 450ml/min through clarifier;
B. in clarifier outlet, by the air of infrared gas analyser on-line checkingi through purification, judge whether containing formaldehyde? as only CO detected
2, formaldehyde do not detected, support type CuO/SiO be described
2oxidant is effective; Otherwise support type CuO/SiO is described
2oxidant lost efficacy;
C. after testing result shows reaction 100 min, in clarifier exit gas, there is formaldehyde to detect, show support type CuO/SiO
2oxidant starts to lose efficacy, and stops containing formaldehyde air through support type MnO
2/ Al
2o
3oxidizing agent scavenging layer, switches to ozone gas by the inlet gas of clarifier simultaneously, makes ozone gas with the flow of 300ml/min, flows through support type CuO/SiO
2oxidizing agent scavenging layer 20 minutes, described ozone gas take oxygen as Balance Air, and ozone concentration of volume percent is 0.01%, and relative humidity is 90%, and air speed is 5000 h
-1.
Then, the inlet gas of clarifier is switched to the above-mentioned air draught containing formaldehyde, then by the air of infrared gas analyser on-line checkingi through purification, testing result only CO detected
2, formaldehyde do not detected, show support type CuO/SiO
2the performance that removes of oxidant is restored.
Embodiment 3:
A., equi-volume impregnating is adopted to be impregnated in by volume required iron nitrate solution on the spherical HZSM-5 molecular sieve carrier of diameter 1 mm, hold over night.Then, through 110 DEG C of dry 6h and 300 DEG C roasting 4h, obtained percentage by weight is the 12% support type Fe removing formaldehyde
2o
3/ HZSM-5 oxidant.Measure above-mentioned made support type Fe
2o
3/ HZSM-5 oxidant 1ml, fills in the quartz glass tube type clarifier of internal diameter 8mm.At room temperature, by containing the air draught of 15 ppm formaldehyde with the traffic flow of 450ml/min through clarifier;
B. in clarifier outlet, by the air of infrared gas analyser on-line checkingi through purification, judge whether containing formaldehyde? as only CO detected
2, formaldehyde do not detected, support type Fe be described
2o
3/ HZSM-5 oxidant is effective; Otherwise support type Fe is described
2o
3/ HZSM-5 oxidant lost efficacy;
C. after testing result shows reaction 110 min, in clarifier exit gas, there is formaldehyde to detect, show support type Fe
2o
3/ HZSM-5 oxidant starts to lose efficacy, and stops containing formaldehyde air through support type Fe
2o
3the oxidizing agent scavenging layer of/HZSM-5, switches to ozone gas by the inlet gas of clarifier simultaneously, makes ozone gas with the flow of 300ml/min, flows through support type Fe
2o
3the oxidizing agent scavenging layer of/HZSM-5 40 minutes, described ozone gas take nitrogen as Balance Air, and ozone concentration of volume percent is 1%, and relative humidity is 20%, and air speed is 100000 h
-1.
Then, the inlet gas of clarifier is switched to the above-mentioned air draught containing formaldehyde, then by the air of infrared gas analyser on-line checkingi through purification, testing result only CO detected
2, formaldehyde do not detected, show support type Fe
2o
3the performance that removes of/HZSM-5 oxidant is restored.
Claims (1)
1. the room temperature of deactivated oxidizing agent in-situ regeneration can be made to remove a method for formaldehyde in air, it is characterized in that circulating successively and carry out following steps:
A. make to pass as the metal oxide purifying layer removing oxidation of formaldehyde agent containing formaldehyde air;
B. the air through purification is detected, judge whether containing formaldehyde?
C. as contained formaldehyde through the air of purification, then stop containing formaldehyde air through metal oxide purifying layer, ozone gas is flowed through metal oxide purifying layer 5 ~ 100 minutes simultaneously, the ozone concentration of volume percent of described ozone gas is 0.01 ~ 1%, relative humidity is 20% ~ 90%, and air speed is 5000 ~ 100000 h
-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510163025.8A CN104741002A (en) | 2015-04-08 | 2015-04-08 | Method for removing formaldehyde in air at room temperature by regenerating invalid oxidant in situ |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510163025.8A CN104741002A (en) | 2015-04-08 | 2015-04-08 | Method for removing formaldehyde in air at room temperature by regenerating invalid oxidant in situ |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104741002A true CN104741002A (en) | 2015-07-01 |
Family
ID=53581596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510163025.8A Pending CN104741002A (en) | 2015-04-08 | 2015-04-08 | Method for removing formaldehyde in air at room temperature by regenerating invalid oxidant in situ |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04161251A (en) * | 1990-10-26 | 1992-06-04 | Mitsubishi Heavy Ind Ltd | Regeneration of exhaust gas purification catalyst |
| CN1410148A (en) * | 2001-09-26 | 2003-04-16 | 区峰 | Regeneration type harmful gas filter and its filtering material |
| CN101314101A (en) * | 2008-07-21 | 2008-12-03 | 北京航空航天大学 | Air purification method combined of adsorption and heat catalytic oxidation regeneration in situ |
| CN101474521A (en) * | 2008-12-30 | 2009-07-08 | 中国科学院长春应用化学研究所 | Indoor air purification method |
| US20110158872A1 (en) * | 2009-11-03 | 2011-06-30 | Ariya Parisa A | Method and System for Adsorbing Pollutants and/or Contaminants |
| CN103349962A (en) * | 2013-07-12 | 2013-10-16 | 北京航空航天大学 | Ozonation-resistant low-concentration organic compound adsorption catalysis material and a preparation method thereof |
| CN104190251A (en) * | 2014-09-09 | 2014-12-10 | 清华大学 | Air purification material and preparation method and application thereof |
-
2015
- 2015-04-08 CN CN201510163025.8A patent/CN104741002A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04161251A (en) * | 1990-10-26 | 1992-06-04 | Mitsubishi Heavy Ind Ltd | Regeneration of exhaust gas purification catalyst |
| CN1410148A (en) * | 2001-09-26 | 2003-04-16 | 区峰 | Regeneration type harmful gas filter and its filtering material |
| CN101314101A (en) * | 2008-07-21 | 2008-12-03 | 北京航空航天大学 | Air purification method combined of adsorption and heat catalytic oxidation regeneration in situ |
| CN101474521A (en) * | 2008-12-30 | 2009-07-08 | 中国科学院长春应用化学研究所 | Indoor air purification method |
| US20110158872A1 (en) * | 2009-11-03 | 2011-06-30 | Ariya Parisa A | Method and System for Adsorbing Pollutants and/or Contaminants |
| CN103349962A (en) * | 2013-07-12 | 2013-10-16 | 北京航空航天大学 | Ozonation-resistant low-concentration organic compound adsorption catalysis material and a preparation method thereof |
| CN104190251A (en) * | 2014-09-09 | 2014-12-10 | 清华大学 | Air purification material and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| DE-ZHI ZHAO ET AL: "Enhanced effect of water vapor on complete oxidation of formaldehyde in air with ozone over MnOx catalysts at room temperature", 《JOURNAL OF HAZARDOUS MATERIALS》 * |
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Application publication date: 20150701 |