CN101934194A - Formaldehyde waste gas high-efficiency membrane absorbent - Google Patents
Formaldehyde waste gas high-efficiency membrane absorbent Download PDFInfo
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- CN101934194A CN101934194A CN 201010501281 CN201010501281A CN101934194A CN 101934194 A CN101934194 A CN 101934194A CN 201010501281 CN201010501281 CN 201010501281 CN 201010501281 A CN201010501281 A CN 201010501281A CN 101934194 A CN101934194 A CN 101934194A
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Abstract
The invention discloses a formaldehyde waste gas high-efficiency membrane absorbent and relates to an absorbent used for processing formaldehyde waste gas in a reclamation mode, which belongs to the technical fields of membrane separation and waste reclamation processing. The adopted absorbent is saturated monohydric alcohol of a straight-chain or branched-chain structure with 2-10 carbon atoms and adopts a hollow fiber membrane contactor (the diameter height ratio is 0.1-0.3, the loading density is 0.1-0.6, the membrane microporous aperture is 0.01-0.3mu m, and the porosity is 0.1-0.6) to process the formaldehyde gas by adopting a membrane absorption method, after the formaldehyde gas is absorbed by the absorbent, acetal and the absorbent are separated according to the difference of the boiling points of the absorption reaction product acetal and the absorbent alcohol by rectifying or regulating the acidity, the reaction product after the separation can be utilized as an organic industrial raw material or product, and the absorbent after the separation can be recycled, thus basically realizing the reclamation processing of the formaldehyde waste gas.
Description
Technical field
A kind of formaldehyde exhaust-gas efficient film absorbent the present invention relates to a kind of absorbent that is used for the recycling treatment formaldehyde exhaust-gas, belongs to membrane separation technique and changing rejected material to useful resource processing technology field.
Background technology
Formaldehyde gas is a kind of wide material sources and to the great pollutant of human health damage, it not only has the intense stimulus effect to skin and respiratory apparatus mucous membrane, and can generate the nitrogen methylene compound with the human body protein qualitative response and make the human body protein sex change, cause slow poisoning, pathology, allergic reaction and nervous system lesion, formaldehyde also has strong short cancer and carcinogenesis in addition, so the improvement of PARA FORMALDEHYDE PRILLS(91,95) waste gas is very urgent.PARA FORMALDEHYDE PRILLS(91,95) treatment of waste gas method mainly contains both at home and abroad at present: absorption method, biofiltration process, plasma processing method and photocatalytic oxidation etc.But these methods are to handle low concentration formaldehyde waste gas (as indoor air and atmosphere) mostly, when handling high-concentration formaldehyde exhaust-gas, not only have long processing period, efficient is low, cost is higher, be easy to produce secondary pollution problems, and substantially all be that formaldehyde branch (falling) is separated, can not effectively utilize this resource of formaldehyde.
Hollow fiber membrane contactors is a kind of novel gas/liquid, liquid/liquid reaction unit, have low power consuming, mass transfer area big, be easy to realize many advantages such as industrialization, the at present existing report that adopts hollow fiber membrane contactors to handle high-concentration formaldehyde exhaust-gas, but the separation of absorption reaction product or when decomposing operating condition comparatively harsh.
Summary of the invention
The purpose of this invention is to provide a kind of absorbent that is used for the recycling treatment formaldehyde exhaust-gas.This absorbent is that the carbon number with straight or branched structure is 2～10 saturated monohydroxy alcohols, adopt membrane absorption method to handle formaldehyde exhaust-gas, product after the separation can be used as the organic industry raw material or product obtains utilizing, unreacted absorbent can be recycled, thereby realizes the recycling treatment of formaldehyde exhaust-gas.
Basic principle:
Formaldehyde and alcohol generate hemiacetal (acetal) under certain condition:
Technical scheme of the present invention: a kind of absorbent that is used for the recycling treatment formaldehyde exhaust-gas, this absorbent are that the carbon number with straight or branched structure is 2～10 saturated monohydroxy alcohols.
This absorbent is used for film and absorbs formaldehyde gas, formaldehyde gas is after described absorbent absorbs, by the method for rectifying or adjusting acidity they are separated with the difference of absorbent alcohol boiling point according to the absorption reaction product, product after the separation can be used as the organic industry raw material or product obtains utilizing, and the absorbent after the separation still can be recycled.
Hollow fiber membrane contactors used in the present invention, its blade diameter length ratio are 0.1～0.3, and loading density is 10%～60%, and the membrane micropore aperture is 0.01～0.3 μ m, porosity 10%～60%.Handle formaldehyde exhaust-gas.Formaldehyde gas imports tube side by the lower end (or upper end) of hollow-fibre membrane, flow to the other end along tube chamber, and its concentration is 5～2500mgm
-3, flow is 1 * 10
-6m
3S
-1～10 * 10
-6m
3S
-1).Tail gas back emptying up to standard after testing; Absorbent drives the shell side that is entered hollow fiber membrane contactors by side by peristaltic pump, returns the absorbent storage tank after flow out in the hollow-fibre membrane tube chamber outside, and its flow velocity is 0.5 * 10
-6m
3S
-1～5 * 10
-6m
3S
-1, temperature is 0～50 ℃, two-phase and stream or counter-current operation are circulated to the absorption reaction product so repeatedly and reach till the predetermined concentration (or saturated).Experimental rig as shown in Figure 1.
The all online detection of import and export temperature and pressure in the experimentation, concentration of formaldehyde are measured and are adopted acetylacetone,2,4-pentanedione AAS (GB/13197-1991), and the absorption reaction product analysis adopts gas chromatography.
Beneficial effect of the present invention:
1, the present invention cleverly traditional chemical absorbing processing method and efficiently membrane separation technique combine, operating condition gentleness (under normal temperature, condition of normal pressure, operating), the processing cycle is short, the treatment effeciency height can the effective recycling formaldehyde in exhaust gas.
When 2, the present invention handled formaldehyde exhaust-gas, resulting absorption product can be used as relevant prepared using, and the straight or branched saturated monohydroxy alcohol after the separation still can be used as absorbent and recycles, thereby realized the recycling treatment of formaldehyde exhaust-gas.
3, application of the present invention is wide.Can handle the formaldehyde exhaust-gas of high concentration, also can handle the formaldehyde exhaust-gas of low concentration; Can be used for the improvement of formaldehyde exhaust-gas, also can be used for formaldehyde waste water and handle; Both be applicable to industrial production, also be applicable to local-style dwelling houses.
Description of drawings
Fig. 1 handles formaldehyde exhaust-gas device schematic diagram with described absorbent membrane absorption method.1., formaldehyde exhaust-gas, 2., membrane contactor, 3., peristaltic pump, 4. absorbent, FIC control flow dial gauge, PI pressure indicator, TI temperature dial gauge.
The specific embodiment
Adopting hollow polypropylene fibre membrane contactor (its blade diameter length ratio is 0.15, and loading density is 23%, and the membrane micropore aperture is 0.2 μ m, porosity 35%), is absorbent with ethanol, and the gas-liquid two-phase cocurrent cooling operation is when the formaldehyde exhaust-gas inlet gas concentration is 1646.8 mgm
-3, induction air flow ratio is 5 * 10
-6m
3S
-1, absorbent flow rates is 6.9 * 10
-7m
3S
-1, the absorbent temperature is 5.8 ℃, and concentration of formaldehyde is 2.1 mg/L in the outlet tail gas, and clearance is 99.87%.
Adopting hollow polypropylene fibre membrane contactor (its blade diameter length ratio is 0.15, and loading density is 23%, and the membrane micropore aperture is 0.2 μ m, porosity 35%), is absorbent with the isoamyl alcohol, and the gas-liquid two-phase cocurrent cooling operation is when the formaldehyde exhaust-gas inlet gas concentration is 780.8 mgm
-3, induction air flow ratio is 6 * 10
-6m
3S
-1, absorbent flow rates is 6.9 * 10
-7m
3S
-1, the absorbent temperature is 5.7 ℃, and concentration of formaldehyde is 1.5mg/L in the outlet tail gas, and clearance is 99.81%.
Adopting hollow polypropylene fibre membrane contactor (its blade diameter length ratio is 0.15, and loading density is 23%, and the membrane micropore aperture is 0.2 μ m, porosity 35%), is absorbent with ethanol, and the gas-liquid two-phase cocurrent cooling operation is when the formaldehyde exhaust-gas inlet gas concentration is 1228.8mgm
-3, induction air flow ratio is 6.7 * 10
-6m
3S
-1, absorbent flow rates is 6.9 * 10
-7m
3S
-1, the absorbent temperature is 5.8 ℃, and concentration of formaldehyde is 1.7 mg/L in the outlet tail gas, and clearance is 99.86%.
When film absorption reaction continued operation certain hour, after the product in the absorbent (acetal) reaches finite concentration, can they be separated by the method for rectifying or adjusting acidity with the difference of acetal boiling point according to absorbent.The unreacted alcohol that reclaims can continue to recycle.The gas chromatographic analysis result shows that the absorption reaction product can separate fully with absorbent, and the rate of recovery can reach 99.5%.
Claims (2)
1. formaldehyde exhaust-gas efficient film absorbent is characterized in that this absorbent is that the carbon number with straight or branched structure is 2～10 saturated monohydroxy alcohols.
2. the application of the described formaldehyde exhaust-gas efficient film absorbent of claim 1, it is characterized in that this absorbent is used for film and absorbs formaldehyde gas, formaldehyde gas is after described absorbent absorbs, by the method for rectifying or adjusting acidity they are separated with the difference of absorbent alcohol boiling point according to the absorption reaction product, product after the separation can be used as the organic industry raw material or product obtains utilizing, and the absorbent after the separation still can be recycled.
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| CN 201010501281 CN101934194A (en) | 2010-10-09 | 2010-10-09 | Formaldehyde waste gas high-efficiency membrane absorbent |
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|---|---|---|---|
| CN 201010501281 CN101934194A (en) | 2010-10-09 | 2010-10-09 | Formaldehyde waste gas high-efficiency membrane absorbent |
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| CN101934194A true CN101934194A (en) | 2011-01-05 |
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| CN 201010501281 Pending CN101934194A (en) | 2010-10-09 | 2010-10-09 | Formaldehyde waste gas high-efficiency membrane absorbent |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104740977A (en) * | 2015-03-02 | 2015-07-01 | 江苏汇维特新材料科技有限公司 | Treatment device and method for coating waste gas |
| CN105879630A (en) * | 2014-12-05 | 2016-08-24 | 江南大学 | Efficient absorbing and treating method for formaldehyde exhaust gas |
| CN108114673A (en) * | 2016-11-29 | 2018-06-05 | 中国科学院大连化学物理研究所 | A kind of hollow-fibre membrane contact reactor and the application in gas-liquid two-phase reaction |
| CN112028371A (en) * | 2020-10-08 | 2020-12-04 | 江苏电科环保有限公司 | System for utilize BOE waste liquid preparation ammonium bifluoride |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362044A (en) * | 2008-09-08 | 2009-02-11 | 江南大学 | Formaldehyde exhaust-gas efficient film absorption technique |
-
2010
- 2010-10-09 CN CN 201010501281 patent/CN101934194A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362044A (en) * | 2008-09-08 | 2009-02-11 | 江南大学 | Formaldehyde exhaust-gas efficient film absorption technique |
Non-Patent Citations (3)
| Title |
|---|
| 《Journal of Membrane Science》 19961231 Huseni A.Rangwala Absorption of carbon dioxide into aqueous solutions using hollow fiber membrane contactors 第231页第2节 1-2 第112卷, 2 * |
| 《有机化学》 19930630 徐寿昌 《有机化学》 高等教育出版社 第214、230、280-281页 1-2 , 1 * |
| 《环境工程学报》 20090831 朱振中等 膜吸收法处理高浓度甲醛废气资源化技术研究 第1474页 2 第3卷, 第8期 2 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879630A (en) * | 2014-12-05 | 2016-08-24 | 江南大学 | Efficient absorbing and treating method for formaldehyde exhaust gas |
| CN104740977A (en) * | 2015-03-02 | 2015-07-01 | 江苏汇维特新材料科技有限公司 | Treatment device and method for coating waste gas |
| CN108114673A (en) * | 2016-11-29 | 2018-06-05 | 中国科学院大连化学物理研究所 | A kind of hollow-fibre membrane contact reactor and the application in gas-liquid two-phase reaction |
| CN112028371A (en) * | 2020-10-08 | 2020-12-04 | 江苏电科环保有限公司 | System for utilize BOE waste liquid preparation ammonium bifluoride |
| CN112028371B (en) * | 2020-10-08 | 2023-10-24 | 江苏电科环保有限公司 | System for utilize BOE waste liquid preparation ammonium bifluoride |
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Application publication date: 20110105 |