CN102068960B - Regeneration method of honeycomb activated carbon absorbent for absorbing nitric oxide - Google Patents
Regeneration method of honeycomb activated carbon absorbent for absorbing nitric oxide Download PDFInfo
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- CN102068960B CN102068960B CN2010105836469A CN201010583646A CN102068960B CN 102068960 B CN102068960 B CN 102068960B CN 2010105836469 A CN2010105836469 A CN 2010105836469A CN 201010583646 A CN201010583646 A CN 201010583646A CN 102068960 B CN102068960 B CN 102068960B
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Abstract
The invention discloses a regeneration method of a honeycomb activated carbon absorbent for absorbing nitric oxide. In the regeneration method, the technology combining vacuum analysis and redox is adopted to achieve the regeneration of the honeycomb activated carbon absorbent for absorbing the nitric oxide; neutralization absorption processing is carried out on the nitric oxide adsorbate in honeycomb activated carbon by using weak alkaline solution containing NH3; and the impregnated urea solution is used as reductant-oxidant, roasting is performed in a vacuum oven so as to achieve the regeneration of activated carbon. The regeneration method has the advantages that the regeneration process is convenient and efficient, and the property of the absorbent is basically not influenced, so that the absorbent can be repeatedly recycled.
Description
Technical field
The present invention relates to a kind of renovation process of acticarbon, particularly relate to a kind of renovation process of nitric oxide adsorption cellular activated carbon adsorbent.
Background technology
Adsorbent reactivation, exactly the itself structure do not take place or the situation of rare variation under, with from adsorbent, removing adsorbate someway, recover its adsorption capacity, to reach the purpose of recycling.
The regeneration of gas active carbon mainly contains following several method:
(1) thermal regeneration method: through the rising adsorbent temperature, make the adsorbate desorption, adsorbent obtains regeneration.Almost various adsorbents all available heat method of reproduction recover adsorption capacity.Different adsorption process need different temperature, suction-operated is strong more, and the temperature that need heat during desorption is high more.
(2) chemical regeneration method:, can make adsorbate be converted into material soluble in water and desorb is got off through chemical reaction.Like, the active carbon of adsorbing phenol, the regeneration of available hydrogen oxidation strength makes the water-soluble and desorb of its form with sodium phenolate.The chemical regeneration method also comprises uses certain solvent to be got off by the material desorb of charcoal absorption.
(3) displacement regeneration
This method is to select suitable gas (desorbing agent), and the adsorbate displacement is come out with stripping.This renovation process need add one procedure, i.e. the desorption again of desorbing agent is so that adsorbent recovers adsorption capacity.Desorbing agent and adsorbate to be adsorbed performance approaching more, then the desorbing agent consumption is economized more.If desorbing agent is adsorbed degree when stronger than adsorbate, belong to displacement regeneration, otherwise stripping and metathesis have all concurrently.This method is applicable to thermally sensitive material.
(4) capacity extraction
Select suitable volume, make the solubility property of adsorbate in this solvent, adsorbate is dissolved the method for getting off much larger than the suction-operated of adsorbent to adsorbate.For example: behind the charcoal absorption SO2, use water washing, carry out suitable drying again and just can recover adsorption capacity.
In the production reality, above-mentioned several kinds of renovation process can use separately, but also several method uses simultaneously.Behind the charcoal absorption organic vapor, available feeding high-temperature steam regeneration, also available heating and the method regeneration that vacuumizes.
Document discloses a kind of renovation process that is applicable to the desulfurization removing nitric activated carbon adsorbent.The adsorbent adding that this method will have been adsorbed organic sulfur compound and organic nitrogen compound contains the water of desulfurization removing nitric microbial cell and the mixed system of oil phase, at 30 ℃ of reaction regenerations, and the adsorbent that filtration, drying, roasting obtain regenerating.This method belongs to bio-regeneration, and complex process and cost are higher.Document is announced the renovation process of relevant activated carbon, but all regeneration of the cellular activated carbon adsorbent of inapplicable nitric oxide adsorption.
Summary of the invention
The object of the present invention is to provide a kind of renovation process that is directed against the cellular activated carbon adsorbent of nitric oxide adsorption.Cellular activated carbon through this method regeneration has characteristics such as the conversion of nitrogen oxides adsorption rate is high, adsorption capacity is big, cost is low, technology is simple, and can recycle.
The objective of the invention is to realize through following technical scheme:
The cellular activated carbon that at first will adsorb nitrogen oxide places 100 ℃ of vacuum drying ovens, and (0.1mpa) vacuum desorption is 3～5 times;
With the activated carbon of desorb at 3～5% the NH that contains
3Soak 0.5h in the weakly alkaline solution, use clear water slowly after the flushing 3～5 times, then active carbon forced air drying 8～12h in 80～100 ℃ of baking ovens;
Dried activated carbon is soaked 20～40min in 3～8% urea liquid, take out in 180～200 ℃ of vacuum drying ovens the regeneration that dry 2～3h has promptly realized cellular activated carbon then.
Compared with prior art; The technology that the present invention adopts vacuum analysis and redox to combine realizes the regeneration of nitric oxide adsorption cellular activated carbon; The advantage of this method is that regenerative process is convenient, efficient; Basically can not influence the character of adsorbent, make adsorbent repeatedly to recycle.
The evaluation of regeneration cellular activated carbon absorption property is being carried out in Φ 16mm, the straight type glass tube of long 300mm reactor, and reaction gas volume air speed (GHSV) is 15000h
-1, adsorbent consumption 10ml is reflected under the normal temperature and pressure environment and carries out.Unstripped gas NOx concentration 35ppm, NO and NO
2Ratio is about 9: 1, and all the other are air.
The present invention serves as the contrast adsorbent with new preparation cellular activated carbon, and unstripped gas NOx concentration is 35ppm, NO and NO
2Ratio is about 9: 1, and all the other are air.
The specific embodiment
Embodiment 1
The saturated cellular activated carbon adsorbent of absorption is placed 100 ℃ of vacuum drying ovens, and (0.1mpa) the normal temperature vacuum desorption is 5 times;
The cellular activated carbon adsorbent of desorb was soaked 0.5 hour in 5% ammonia spirit, use clear water slowly after the flushing 5 times then, with active carbon forced air drying 8 hours in 100 ℃ of baking ovens;
Dried activated carbon was soaked 40 minutes in 8% urea liquid, took out then in 200 ℃ of vacuum drying ovens dry 2 hours, realize cellular activated carbon regeneration.
Embodiment 2
The cellular activated carbon that at first will adsorb nitrogen oxide places 100 ℃ of vacuum drying ovens, and (0.1mpa) the normal temperature vacuum desorption is 5 times;
The activated carbon of desorb was soaked 0.5 hour in 5% ammonia spirit, use clear water slowly after the flushing 5 times then, with active carbon forced air drying 8 hours in 100 ℃ of baking ovens;
Dried activated carbon was soaked 40 minutes in 3% urea liquid, took out then in 200 ℃ of vacuum drying ovens dry 2 hours, realize the regeneration of cellular activated carbon.
Embodiment 3
The cellular activated carbon that at first will adsorb nitrogen oxide places 100 ℃ of vacuum drying ovens, and (0.1mpa) the normal temperature vacuum desorption is 5 times;
The activated carbon of desorb was soaked 0.5 hour in 5% ammonium bicarbonate soln, use clear water slowly after the flushing 3 times then, with active carbon forced air drying 8 hours in 100 ℃ of baking ovens;
Dried activated carbon was soaked 20 minutes in 8% urea liquid, took out then in 180 ℃ of vacuum drying ovens dry 3 hours, realize the regeneration of cellular activated carbon.
Embodiment 4
The cellular activated carbon that at first will adsorb nitrogen oxide places 100 ℃ of vacuum drying ovens, and (0.1mpa) the normal temperature vacuum desorption is 3 times;
The activated carbon of desorb was soaked 0.5 hour in 5% ammonia spirit, use clear water slowly after the flushing 5 times then, with active carbon forced air drying 12 hours in 80 ℃ of baking ovens;
Dried activated carbon was soaked 20 minutes in 8% urea liquid, took out then in 180 ℃ of vacuum drying ovens dry 3 hours, realize the regeneration of cellular activated carbon.
Embodiment 5
The cellular activated carbon that at first will adsorb nitrogen oxide places 100 ℃ of vacuum drying ovens, and (0.1mpa) the normal temperature vacuum desorption is 3 times;
The activated carbon of desorb was soaked 0.5 hour in 3% ammonium bicarbonate soln, use clear water slowly after the flushing 5 times then, with active carbon forced air drying 12 hours in 80 ℃ of baking ovens;
Dried activated carbon was soaked 20 minutes in 8% urea liquid, took out then in 200 ℃ of vacuum drying ovens dry 2 hours, realize the regeneration of cellular activated carbon.
Embodiment 6
The cellular activated carbon that at first will adsorb nitrogen oxide places 100 ℃ of vacuum drying ovens, and (0.1mpa) the normal temperature vacuum desorption is 5 times;
The activated carbon of desorb was soaked 0.5 hour in 3% ammonia spirit, use clear water slowly after the flushing 5 times then, with active carbon forced air drying 6 hours in 100 ℃ of baking ovens;
Dried activated carbon was soaked 30 minutes in 5% urea liquid, took out then in 200 ℃ of vacuum drying ovens dry 2 hours, realize the regeneration of cellular activated carbon.
Table 1 embodiment and comparative example are to NO clean-up effect contrast table
Claims (3)
1. the renovation process of the cellular activated carbon adsorbent of nitric oxide adsorption adopts vacuum desorption and the redox technology of combining to realize the regeneration of nitric oxide adsorption cellular activated carbon, it is characterized in that may further comprise the steps:
The cellular activated carbon adsorbent that 1) will adsorb nitrogen oxide places the vacuum drying oven vacuum desorption;
2) place weakly alkaline solution to soak 30 minutes the honeycomb activated carbon adsorbent of step 1) desorb, then with clear water slowly after the flushing, with active carbon forced air drying 8～12 hours in baking oven;
3) with step 2) dried honeycomb activated carbon adsorbent soaked in urea liquid 20～40 minutes, took out in 180～200 ℃ of vacuum drying ovens dry 2～3 hours, promptly realized the regeneration of the cellular activated carbon adsorbent of nitric oxide adsorption,
Described vacuum desorption is desorb 3～5 times in 100 ℃ vacuum drying oven, and the vacuum of vacuum drying oven is-0.1MPa.
2. the renovation process of the cellular activated carbon adsorbent of nitric oxide adsorption according to claim 1 is characterized in that, described weakly alkaline solution is ammoniacal liquor or ammonium bicarbonate soln, and mass content is 3～5%.
3. the renovation process of the cellular activated carbon adsorbent of nitric oxide adsorption according to claim 1 is characterized in that, described urea liquid mass content is 3～8%.
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| CN104667703B (en) * | 2015-02-02 | 2016-09-07 | 河海大学 | The combined system of sulfur dioxide in a kind of charcoal absorption stack gases |
| CN107413166B (en) * | 2017-03-27 | 2020-04-28 | 郑经堂 | Method for treating nitrogen oxide waste gas by recycling carbon-based microporous material |
| CN109621929B (en) * | 2019-01-22 | 2021-06-04 | 北方民族大学 | Regeneration method and application of waste activated carbon |
| CN111284910B (en) * | 2020-02-10 | 2021-07-30 | 湖南大学 | Double-layer sealing box with connecting piece module |
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| CN1287893C (en) * | 2003-12-11 | 2006-12-06 | 中国科学院山西煤炭化学研究所 | Method of regenerating activated charcoal for processing phenolic waste water |
| CN101884906B (en) * | 2010-07-06 | 2012-05-23 | 上海纳米技术及应用国家工程研究中心有限公司 | Modified honeycomb activated carbon with nitric oxide adsorption function and preparation method thereof |
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