CN101642698B - Adsorbent used for separating formaldehyde from air and preparation method thereof - Google Patents
Adsorbent used for separating formaldehyde from air and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an adsorbent used for efficiently separating formaldehyde from air and a preparation method thereof. An adsorbent carrier is active carbon, the surface of which is attached with one or more of -NH, -NH2 and -NH3. The precursor of -NH, -NH2 and -NH3 is one of salvolatile, ammonium bicarbonate, ammonium sulfate, ammonium nitrate, ammonium chloride, ethene diamine, hexamethylenediamine, aniline and urea. The adsorbent can absorb and separate formaldehyde in air when space velocity is 20000-80000h-1 at room temperature. Especially when the formaldehyde and benzene seriesin the air coexist, the adsorbent not only can absorb and separate formaldehyde but also can absorb and separate the benzene series. Therefore, the adsorbent can be widely applied to the purifying treatment of air in hermetic and semi-hermetic limited spaces, such as building interiors, spacecrafts, submarines, undergrounds and the like.
Description
Technical field
The invention belongs to technical field of air purification processing, be specifically related to a kind of from air high efficiency separation formaldehyde, and can not produce adsorbent of secondary pollution and preparation method thereof.
Technical background
Formaldehyde extensively is present among the air ambient, and especially building is indoor, and airtight, semi-hermetic cabin such as spacecraft, submarine, subway, is one of main air pollutants of confined space environment.The source more complicated of formaldehyde mainly comprises urea aldehyde/phenolic resin glue wood-based plate, like glued board, core-board, medium density fibre board (MDF) and particieboard; The ornament materials that contains formaldehyde is like wallpaper, coating, adhesive, urea-formaldehyde foam insulating materials and plastic floor; Distribute display and adornment in the indoor and cabin of formaldehyde, like furniture, chemical fibre carpet and foamed plastics; The material of formaldehyde is distributed in burning, like domestic fuel burning, cigarette combustion; Daily necessities is like cosmetics, cleaning agent, anticorrisive agent, printing ink and textile fabric.
Formaldehyde mainly shows aspects such as allotriosmia, stimulation, allergy, abnormal pulmonary function, dysfunction of liver and immunologic dysfunction to health effects.Long-term contact low concentration formaldehyde can cause chronic respiratory disease, degradation under nasopharyngeal carcinoma, colon cancer, the cancer of the brain, paramenia, nuclear gene mutation, pregnancy syndrome, leukaemia, memory and the intelligence.In all contactees, children, pregnant woman and old man's PARA FORMALDEHYDE PRILLS(91,95) are particularly responsive, endanger also bigger.International cancer research organization has advised it is treated as suspect carcinogen.
At present, for the processing of low concentration formaldehyde in the Air and Water in Limited Space, mainly adopt methods such as low-temperature catalytic oxidation, absorption, photocatalysis and low temperature plasma oxidation to handle.Research shows; But low-temperature catalytic oxidation the efficient oxidation formaldehyde is carbon dioxide and water; But when formaldehyde and the coexistence of benzene series thing, other method outside the needs employing is low-temperature catalyzed solves the purified treatment problem of benzene series thing; This certainly will make the investment of treatment system and operating cost increase, and the maintenance management difficulty increases.
Absorption is main adopts the metal oxide of porous and the formaldehyde that the nonmetal oxide material comes adsorbing separation gas phase low concentration, because these sorbing material pore volumes and specific area are limited, thereby adsorption capacity is lower, and service life is very short.Simultaneously, when the coexistence of formaldehyde and benzene series thing, need equally to adopt other method solve the purified treatment problem of benzene series thing, thereby bring that treatment system is complicated, investment and problem such as operating cost is high, the maintenance management difficulty is big.
The low temperature plasma oxidation has the effect that purifies formaldehyde and benzene series thing concurrently, and still, it is higher to handle energy consumption; And when only relying on the low temperature plasma oxidation processes; Because oxidation is not thorough, can form harmful intermediate product, simultaneously; If adopt charging method to produce low temperature plasma, also can form harmful discharging product such as ozone and nitrogen dioxide.
Photochemical catalytic oxidation efficient is lower, and oxidation is not thorough, also can generate other harmful incomplete oxidation products, causes secondary pollution.In addition, when the coexistence of formaldehyde and benzene series thing, not only need adopt other method to solve the purified treatment problem of benzene series thing, and the benzene series thing possibly cause that also photochemical catalyst poisons.
As everyone knows, active carbon has huge inner surface and adsorption capacity, is the ideal material of adsorbing separation gas phase low concentration, macromolecular organic compound.Yet, without the poor-performing of the Activated Carbon Adsorption Separation gas phase low concentration formaldehyde of special disposal.Contain low concentration formaldehyde or low concentration formaldehyde and the coexistence of benzene series thing mostly in indoor airtight, the semi-hermetic cabin air with spacecraft, submarine, subway of building; Develop suitable scavenging material or method, remove the extensive concern that these harmful substances receive various countries' researcher always.
Summary of the invention
The object of the present invention is to provide a kind of being used for from adsorbent of air separating formaldehyde and preparation method thereof, under high-speed, adsorbent provided by the invention is the formaldehyde in the separation of air effectively, and adsorption capacity is big, long service life.Particularly in air, contain formaldehyde and benzene series thing simultaneously, said adsorbent PARA FORMALDEHYDE PRILLS(91,95) and benzene series thing all have efficient adsorbing separation effect.
The adsorbent that the present invention relates to is made carrier with active carbon, its surface attachment-NH ,-NH
2With-NH
3In one or more ,-NH ,-NH
2With-NH
3Precursor be a kind of in ammonium carbonate, carbonic hydroammonium, ammonium sulfate, ammonium nitrate, ammonium chloride, ethylenediamine, hexamethylene diamine, aniline, the urea, when preparing said adsorbent, the weight ratio of used precursor and carrier is (3～25): 100.
Described absorbent charcoal carrier can be particle, fiber or Powdered.
Adsorbent of the present invention can adopt any method in following solution soaking method or the gas phase adsorption method to prepare.When adopting the solution soaking legal system to be equipped with, its preparation process may further comprise the steps:
1) use the dissolution with solvents precursor, the weight ratio of precursor and solvent is (1～3.2): 100.
2) carrier is added in the solution of solvent and precursor formation;
3) solution that is dissolved with precursor evenly mixes with carrier;
4) utilize Rotary Evaporators to remove solvent composition;
5) oven dry is handled in the drying box;
6) naturally cool to room temperature, promptly get required adsorbent.
When adopting gas phase adsorption method to prepare, its preparation process may further comprise the steps:
1) precursor is put into a small-sized open containers;
The small-sized open containers and the carrier that 2) will fill precursor place in the same closed container;
3) heating closed container decomposes precursor and gasification;
4) naturally cool to room temperature, promptly get required adsorbent.
Under normal pressure, room temperature condition, be 20000～80000h in air speed
-1In the scope, the adsorbent of the present invention's preparation and the absorption property of untreated active carbon (promptly the present invention relates to the carrier of adsorbent) are compared, the result shows that formaldehyde and benzene series substrate concentration are respectively 0.8～3.1mg/m in air
3With 2.5～7.3mg/m
3, (corresponding reactor outlet concentration of formaldehyde is 0.1mg/m to the time of break-through of untreated active carbon
3Adsorption time, down with) less than 0.1h, the time of break-through of the adsorbent of the present invention's preparation is 3～42h.
Said adsorbent directly is placed in the air maybe this adsorbent placed in the cleaning equipment, can be used in the clean room or the formaldehyde of air in closed space, and the mixture of formaldehyde and benzene series thing.
Advantage of the present invention shows:
1) compare with the catalytic purification material with existing formaldehyde absorption, the adsorbent that the present invention relates to is under high-speed, and ability is adsorbing separation gas phase low concentration formaldehyde efficiently, and adsorption capacity is big, long service life.When particularly formaldehyde and benzene series thing coexist as gas phase, adopt this adsorbent can be, thereby simplify cleaning equipment, reduce the cost and the operating cost of cleaning equipment simultaneously with formaldehyde and benzene series thing purification separation from air.
2) with compared with techniques such as existing photochemical catalytic oxidation, low-temperature plasma oxidations, utilize adsorbent provided by the invention to carry out adsorption cleaning and handle, purify thoroughly, can not produce new pollutant, can not cause secondary pollution.
3) adsorbent provided by the invention is particularly useful for containing the room or the air cleaning processing airtight, the semi-hermetic cabin of low concentration formaldehyde or low concentration formaldehyde and the coexistence of other VOC.
The specific embodiment
In order to be illustrated more clearly in the present invention, enumerate following examples, but it there is not any restriction to scope of the present invention.
The present invention provides a kind of adsorbent that is used for adsorbing separation air formaldehyde, and described adsorbent prepares through solution soaking method or gas phase adsorption method, provides the instance of several adsorbent preparations below:
Embodiment 1,The preparation of solution soaking method is numbered 1～9 adsorbent, and the preparation method is following:
(1) with ethanol as solvent, the dissolving precursor.
In the 500mL beaker, add earlier the 100mL absolute ethyl alcohol, add 1 gram ammonium carbonate again, make ammonium carbonate dissolve fully and mix.
(2) carrier is added in the solution of ethanol and precursor formation;
With 30 gram particle degree is that the granular activated carbon of 2mm adds in the solution that ethanol and precursor constitute.
(3) ethanolic solution that is dissolved with precursor evenly mixes with carrier.
Stir gently with glass bar, make the ethanolic solution that is dissolved with precursor evenly mix with carrier.
(4) mixture in the beaker is transferred to evaporative flask, and utilizes Rotary Evaporators vacuum evaporation, remove solvent composition.
(5) in 90 ℃ of drying boxes dry 12 hours.
(6) naturally cool to room temperature after, promptly obtain being numbered 1 adsorbent.
In like manner; Be numbered 1 preparation of adsorbent method preparation numbering according to above-mentioned preparation and be respectively 2～9 adsorbent; Only need will above-mentioned 1 gram ammonium carbonate to restrain the urea replacement with restrain oneself diamines, 3mL aniline and 1 of 1.6 gram carbonic hydroammonium, 1.4 gram ammonium sulfate, 1.6 gram ammonium nitrate, 1 gram ammonium chloride, 1mL ethylenediamine, 2 respectively, promptly call number is respectively 2～9 adsorbent.
According to the adsorbent of above-mentioned solution soaking method preparation, the surface adsorption of carrier active carbon has-NH ,-NH
2With-NH
3In one or more.
Get and be numbered 1 adsorbent and reference adsorbent (carrier active carbon of handling with precursor of the present invention does not comprise granular activated carbon, fiber-reactive charcoal and Powdered Activated Carbon) to place internal diameter be the glass tube reactor of 10mm, feed to contain formaldehyde 2.1mg/m
3Air, tolerance is 3L/min, under atmospheric pressure at room (22 ℃), carries out the absorption property evaluation, records under the different air speeds, (adsorption bed outlet concentration of formaldehyde reaches 0.1mg/m to time of break-through
3Pairing adsorption time) as shown in table 1:
Time of break-through contrast table under the different air speeds of table 1
| Air speed, h -1 | ?20000 | 50000 | 80000 |
| The granular activated carbon time of break-through, h | ?＜0.1 | ＜0.1 | ＜0.1 |
| Fiber-reactive charcoal time of break-through, h | ?＜0.1 | ＜0.1 | ＜0.1 |
| The Powdered Activated Carbon time of break-through, h | ?＜0.1 | ＜0.1 | ＜0.1 |
| Be numbered 1 adsorbent time of break-through, h | ?34 | 18.5 | 8 |
Visible from table 1, the time of break-through of adsorbent provided by the invention is far longer than carrier active carbon, has good adsorption property.
Get and be numbered 1 adsorbent and the reference adsorbent (carrier active carbon of not handling with precursor of the present invention; Comprise granular activated carbon, fiber-reactive charcoal and Powdered Activated Carbon) to place internal diameter respectively be the glass tube reactor of 10mm, feeds formaldehyde respectively and benzene series thing content is respectively 2.1mg/m
3And 2.5mg/m
3Air, tolerance is 3L/min, under atmospheric pressure at room (22 ℃), carries out the absorption property evaluation, records under the different air speeds, (adsorption bed outlet concentration of formaldehyde reaches 0.1mg/m to time of break-through
3Pairing adsorption time) as shown in table 2:
Time of break-through contrast table under the different air speeds of table 2
| Air speed, h -1 | 20000 | 50000 | 80000 |
| The granular activated carbon time of break-through, h | ＜0.1 | ＜0.1 | ＜0.1 |
| Fiber-reactive charcoal time of break-through, h | ＜0.1 | ＜0.1 | ＜0.1 |
| The Powdered Activated Carbon time of break-through, h | ＜0.1 | ＜0.1 | ＜0.1 |
| Be numbered 1 adsorbent time of break-through, h | 29.5 | 15 | 6.4 |
Data can obtain from table 2; The time of break-through of the adsorbent that the inventive method prepares is far longer than the time of break-through of common acticarbon; Has good adsorption property for formaldehyde and benzene series thing; Can from air, formaldehyde and benzene series thing be separated, described adsorbent can be placed directly in the air use separately and also can be placed in the cleaning equipment and use.
Embodiment 2,The preparation of solution soaking method is numbered 10～18 adsorbent.
Choose the carrier of 20 gram fiber-reactive charcoals (being cut into the length of side is the square of 2 ± 0.5mm) as the preparation adsorbent, remaining preparation process, process conditions and material obtain being numbered 10～18 adsorbent successively with embodiment 1.According to the adsorbent of above-mentioned solution soaking method preparation, the surface adsorption of carrier active carbon has-NH ,-NH
2With-NH
3In one or more.
Embodiment 3,The preparation of solution soaking method is numbered 19～27 adsorbent.
Replace 100mL ethanol with 100mL water; And choose 10 gram Powdered Activated Carbons as the carrier for preparing adsorbent; Drying condition is in 110 ℃ of drying boxes dry 6 hours, and remaining preparation process, process conditions and material obtain being numbered 19～27 adsorbent successively with embodiment 1.According to the adsorbent of above-mentioned solution soaking method preparation, the surface adsorption of carrier active carbon has-NH ,-NH
2With-NH
3In one or more.
Embodiment 4,Adopt the gas phase adsorption method preparation to be numbered 28～36 adsorbent, preparation method's step is following:
(1) precursor 1 gram ammonium carbonate is put into a miniature beaker of small-sized open containers;
(2) in the 500mL boiling flask, adding 30 gram particle degree earlier is the granular activated carbon of 2mm, and the miniature beaker that will fill precursor 1 gram ammonium carbonate is again put down the surface at active carbon gently, and with rubber stopper seal flask mouth.Described miniature beaker volume is 5mL.
(3) heating closed container flask places 180 ℃ of oil baths to heat 1h in flask, makes ammonium carbonate decompose, gasify.
(4) from oil bath, take out flask, naturally cool to room temperature, promptly obtain being numbered 28 adsorbent.
Respectively with 1.6 gram carbonic hydroammonium, 1.4 gram ammonium sulfate, 1.6 gram ammonium nitrate, 1 gram ammonium chloride, 1mL ethylenediamine, 2 restrain oneself diamines, 3mL aniline and 1 gram urea replacement, promptly call number is 29～36 adsorbent with above-mentioned 1 gram ammonium carbonate.The adsorbent surface that adopts method for preparing to obtain is adsorbed with-NH ,-NH
2With-NH
3In one or more.
Embodiment 5,Adopt the gas phase adsorption method preparation to be numbered 37～45 adsorbents.
Choose the carrier of 20 gram fiber-reactive charcoals (being cut into the length of side is the square of 2 ± 0.5mm) as the preparation adsorbent, remaining preparation process, process conditions and material obtain being numbered 37～45 adsorbent successively with embodiment 4.The adsorbent surface that adopts method for preparing to obtain is adsorbed with-NH ,-NH
2With-NH
3In one or more.
Embodiment 6,Adopt the gas phase adsorption method preparation to be numbered 46～54 adsorbent.
Choose the carrier of 10 gram Powdered Activated Carbons as the preparation adsorbent, flask places 240 ℃ of oil baths to heat 0.5h, and remaining preparation process, process conditions and material obtain being numbered 46～54 adsorbent successively with embodiment 4.The adsorbent surface that adopts method for preparing to obtain is adsorbed with-NH ,-NH
2With-NH
3In one or more.
Get and be numbered 2～54 adsorbent to place internal diameter respectively be the glass tube reactor of 10mm, feed respectively to contain formaldehyde 2.2mg/m
3Air, tolerance is 3L/min, is 50000h in atmospheric pressure at room (22 ℃), air speed
-1Under the condition, carry out the absorption property evaluation, (adsorption bed outlet concentration of formaldehyde reaches 0.1mg/m to record time of break-through
3Pairing adsorption time) as shown in table 3.
Table 3 different adsorbent butt joints provided by the invention contain the adsorption penetration timetable of formaldehyde air
| The adsorbent numbering | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Time of break-through, h | 17.5 | 16.4 | 13.5 | 19 | 20.3 | 14.2 | 18.3 | 14.6 | 13.8 |
| The adsorbent numbering | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| Time of break-through, h | 15.3 | 20 | 17.4 | 14 | 15.3 | 12.6 | 15.6 | 16.3 | 28.5 |
| The adsorbent numbering | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| Time of break-through, h | 28.3 | 25.4 | 29.7 | 28 | 27.4 | 27.1 | 23.3 | 24.2 | 16.9 |
| The adsorbent numbering | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 |
| Time of break-through, h | 18 | 16.4 | 19.9 | 18.4 | 15.6 | 18.4 | 20.3 | 18 | 18.4 |
| The adsorbent numbering | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 |
| Time of break-through, h | 20.5 | 21.4 | 19 | 18.3 | 20.5 | 19.2 | 17.2 | 14.3 | 30.3 |
| The adsorbent numbering | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | |
| Time of break-through, h | 33.4 | 32.1 | 30.4 | 29.4 | 27.3 | 31.3 | 30 | 29.4 |
Get and be numbered 2～54 adsorbent to place internal diameter respectively be the glass tube reactor of 10mm, feed formaldehyde and benzene series thing content 2.3mg/m respectively respectively
3And 3.9mg/m
3Air, tolerance is 3L/min, is 50000h in atmospheric pressure at room (22 ℃), air speed
-1Under the condition, carry out the absorption property evaluation, (adsorption bed outlet concentration of formaldehyde reaches 0.1mg/m to record time of break-through
3Pairing adsorption time) as shown in table 4.
Table 4 different adsorbents provided by the invention are for the adsorption penetration timetable of the air that contains formaldehyde and benzene series thing
| The adsorbent numbering | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Time of break-through, h | 12 | 9.4 | 10.1 | 11.4 | 15 | 11.5 | 12.8 | 11.9 | 9 |
| The adsorbent numbering | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| Time of break-through, h | 12.5 | 11.8 | 13.6 | 13 | 12.1 | 11.3 | 13.3 | 14 | 19.4 |
| The adsorbent numbering | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| Time of break-through, h | 19.3 | 20 | 22.1 | 22.1 | 23 | 22.9 | 18.3 | 20.3 | 15.8 |
| The adsorbent numbering | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 |
| Time of break-through, h | 13.9 | 12.7 | 15 | 11.3 | 13.2 | 13.9 | 14.2 | 15.3 | 13.1 |
| The adsorbent numbering | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 |
| Time of break-through, h | 17.1 | 17 | 13.5 | 16.3 | 17 | 15.7 | 14.2 | 14.8 | 18.8 |
| The adsorbent numbering | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | |
| Time of break-through, h | 21.9 | 20 | 24.7 | 22.8 | 23.7 | 26 | 24.9 | 21.6 |
Get and be numbered 2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53 adsorbent to place internal diameter respectively be the glass tube reactor of 10mm, feed to contain formaldehyde 0.8mg/m
3Air, tolerance is 3L/min, is 50000h in atmospheric pressure at room (22 ℃), air speed
-1Under the condition, carry out the absorption property evaluation, (adsorption bed outlet concentration of formaldehyde reaches 0.1mg/m to record time of break-through
3Pairing adsorption time) as shown in table 5.
The different adsorbents adsorb of table 5 contain the time of break-through table of formaldehyde air
| The adsorbent numbering | 2 | 5 | 8 | 11 | 14 | 17 | 20 | 23 | 26 |
| Time of break-through, h | 29 | 25.6 | 27.7 | 30 | 31.5 | 28.2 | 37.2 | 36 | 37.2 |
| The adsorbent numbering | 29 | 32 | 35 | 38 | 41 | 44 | 47 | 50 | 53 |
| Time of break-through, h | 28 | 27.3 | 28.3 | 27.2 | 27.6 | 24.3 | 34.2 | 38.2 | 33.4 |
Get and be numbered 2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53 adsorbent to place internal diameter respectively be the glass tube reactor of 10mm, feed to contain formaldehyde 1.4mg/m
3Air, tolerance is 3L/min, is 20000h in atmospheric pressure at room (22 ℃), air speed
-1Under the condition, carry out the absorption property evaluation, (adsorption bed outlet concentration of formaldehyde reaches 0.1mg/m to record time of break-through
3Pairing adsorption time) as shown in table 6.
The different adsorbents adsorb of table 6 contain the time of break-through table of formaldehyde air
| The adsorbent numbering | 2 | 5 | 8 | 11 | 14 | 17 | 20 | 23 | 26 |
| Time of break-through, h | 32.1 | 28.7 | 34.1 | 30 | 37.5 | 32.2 | 41.2 | 42 | 40.2 |
| The adsorbent numbering | 29 | 32 | 35 | 38 | 41 | 44 | 47 | 50 | 53 |
| Time of break-through, h | 34.2 | 31.3 | 32.3 | 31.9 | 32.3 | 29.7 | 39.9 | 41.2 | 42 |
Get and be numbered 2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47,50 and 53 adsorbent to place internal diameter respectively be the glass tube reactor of 10mm, and feed respectively and contain formaldehyde 3.1mg/m
3Air, tolerance is 3L/min, is 80000h in atmospheric pressure at room (22 ℃), air speed
-1Under the condition, carry out the absorption property evaluation, (adsorption bed outlet concentration of formaldehyde reaches 0.1mg/m to record time of break-through
3Pairing adsorption time) as shown in table 7.
The different adsorbents adsorb of table 7 contain the time of break-through table of formaldehyde air
| The adsorbent numbering | 2 | 5 | 8 | 11 | 14 | 17 | 20 | 23 | 26 |
| Time of break-through, h | 6.1 | 4.6 | 5.1 | 4.8 | 5.1 | 6.2 | 8.2 | 7.3 | 7.2 |
| The adsorbent numbering | 29 | 32 | 35 | 38 | 41 | 44 | 47 | 50 | 53 |
| Time of break-through, h | 4.9 | 5.3 | 4.9 | 5.5 | 5.6 | 4.3 | 7.2 | 8.1 | 7.9 |
Get and be numbered 2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47,50 and 53 adsorbent to place internal diameter respectively be the glass tube reactor of 10mm, and feed formaldehyde respectively and the benzene series substrate concentration is respectively 3.1mg/m
3And 7.3mg/m
3Air, tolerance is 3L/min, is 80000h in atmospheric pressure at room (22 ℃), air speed
-1Under the condition, carry out the absorption property evaluation, (adsorption bed outlet concentration of formaldehyde reaches 0.1mg/m to record time of break-through
3Pairing adsorption time) as shown in table 8.
The different adsorbents adsorb of table 8 contain the time of break-through table of formaldehyde air
| The adsorbent numbering | 2 | 5 | 8 | 11 | 14 | 17 | 20 | 23 | 26 |
| Time of break-through, h | 5.5 | 3 | 5.1 | 4.3 | 5.8 | 4.2 | 5.2 | 4.9 | 5.1 |
| The adsorbent numbering | 29 | 32 | 35 | 38 | 41 | 44 | 47 | 50 | 53 |
| Time of break-through, h | 3.4 | 3.9 | 4 | 4.5 | 3.7 | 3.7 | 5.2 | 5.7 | 5.2 |
Claims (3)
1. one kind is used for it is characterized in that from the adsorbent of air separating formaldehyde: the carrier of this adsorbent is an active carbon, its surface attachment-NH ,-NH
2With-NH
3In one or more ,-NH ,-NH
2With-NH
3Precursor be a kind of in ethylenediamine, hexamethylene diamine, aniline, the urea, under normal pressure, room temperature condition, be 20000～80000h in air speed
-1In the scope, formaldehyde and benzene series substrate concentration are respectively 0.8～3.1mg/m in air
3With 2.5～7.3mg/m
3, the time of break-through of adsorbent is 3～42h; Adopt gas phase adsorption method to prepare described adsorbent, may further comprise the steps:
1) precursor is put into a small-sized open containers;
The container and the carrier that 2) will fill precursor place in the same closed container; The weight ratio of precursor and carrier is (3～25): 100;
3) heating closed container decomposes precursor and gasification; Adopting heating-up temperature is 180～240 ℃, 0.5～1 hour time;
4) naturally cool to room temperature, promptly get required adsorbent.
2. a kind of being used for as claimed in claim 1 is characterized in that from the adsorbent of air separating formaldehyde, and said active carbon is particle, fiber or Powdered.
3. the application of the described adsorbent of claim 1; It is characterized in that: said adsorbent directly is placed in the air maybe this adsorbent is placed in the cleaning equipment; Be used in the clean room or the formaldehyde of air in closed space, and the mixture of formaldehyde and benzene series thing.
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