CN1032044C - High-efficiency serbent for adsorbing CO2 and prodn. method thereof - Google Patents
High-efficiency serbent for adsorbing CO2 and prodn. method thereof Download PDFInfo
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- CN1032044C CN1032044C CN92108508A CN92108508A CN1032044C CN 1032044 C CN1032044 C CN 1032044C CN 92108508 A CN92108508 A CN 92108508A CN 92108508 A CN92108508 A CN 92108508A CN 1032044 C CN1032044 C CN 1032044C
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- Prior art keywords
- absorbent
- carrier
- perlite
- dioxide absorbent
- dioxide
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- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a carbon dioxide absorbent and a preparation method thereof, which belongs to a solid absorbent for absorbing gas. 20 to 40% of expanded perlite as a carrier is mixed with solution of 60 to 80% of sodium hydroxide and dewatered in vacuum for preparing the carbon dioxide absorbent. Phenolphthalein or a phenolphthalein acid base indicator as color development indication can also be added in the present invention. The absorbent of the present invention has the advantages of strong sustained load capability, high absorption efficiency, large capacity, small air resistance, convenient preparation, low cost, no poison, obvious color development and wide application to gas purification and gas analysis.
Description
The present invention is a kind of effective carbon-dioxide absorbent and preparation method thereof, belongs to the solid absorbent that absorbs gas, and the degree of depth that is mainly used in carbon dioxide absorbs.
Many productions and scientific domain, for example aerospace, diving, medicine, chemical industry, microelectronics, food, metallurgy etc. need to remove the carbon dioxide in the gas.The absorbent that absorbs carbon dioxide in the gas has liquid and solid two big classes.Liquid-absorbant such as alkali hydroxide soln, alkali metal carbonate solution and various hydramine etc., their absorptivity is not high, generally is used for the absorption of constant carbon dioxide, and the fusing point or the boiling point of its serviceability temperature liquid body limit, some liquid-absorbant also is corrosive, and uses inconvenience.Oxide, hydroxide or the carbonate of solid absorbent such as alkali (soil) metal, their specific area is little, and absorptive capacity is little, and can form compacted zone behind the absorbing carbon dioxide, reduces absorption efficiency.Molecular sieve also can absorbing carbon dioxide, but also adsorbs other gas.Be to improve absorption efficiency, increase absorptive capacity, usually absorbing material is held and be loaded on the carrier, form to hold and carry a type solid absorbent.For example, NaOH is held and is loaded on calcium oxide, the calcium hydroxide, and sodium carbonate is held and is loaded on the asbestos, and Japanese kokai publication sho 58-177137 holds calcium hydroxide and is loaded on the active carbon, and the spy opens clear 55-158933 and calcium hydroxide held to be loaded in plastics package paper first-class.But above-mentioned absorbent absorption efficiency is not high, is used for the absorption of constant carbon dioxide mostly.The traces of carbon dioxide absorbent that the degree of depth commonly used absorbs is NaOH to be held be loaded on the asbestos, i.e. the alkali asbestos.Czech patents CS103680, U.S. Pat 3909206 are held NaOH respectively and are stated from float stone and the polytetrafluoroethylene (PTFE), and U.S. Pat 4433981 is held metal carbonate and is loaded on the Woelm Alumina.Carrier asbestos in the above-mentioned carbon-dioxide absorbent are poisonous, and porous is poor, and the absorbing carbon dioxide rear surface forms the sodium carbonate thin layer, and influence further absorbs, and vapour lock increases even stops up gas circuit, and the price of polytetrafluoroethylene (PTFE) and Woelm Alumina is higher.
The objective of the invention is to prepare a kind of constant carbon dioxide that absorbs, also can absorb the absorbent of traces of carbon dioxide, select carrier cheap and easy to get for use, has high absorption efficiency, absorptive capacity is big, vapour lock is little, can add color indicator, makes carbon-dioxide absorbent of the present invention be specially adapted to use in purification for gas and the gas analysis.
The present invention is a kind of effective carbon-dioxide absorbent, comprises NaOH, and feature of the present invention is to be carrier with the expanded perlite, and its prescription (percentage by weight) is: expanded perlite 20-40%, NaOH 60-80%.
The optimum weight ratio of perlite carrier of the present invention and NaOH is 1: 2.
Carbon-dioxide absorbent of the present invention also can add acid-base indicator, and its percentage by weight is 0.02-0.20%, is preferably 0.05-0.10%.
The acid-base indicator that the present invention uses can be phenolphthalein or phenolphthalein, the mixture of dawn Huang, chromazurine etc.
The present invention also comprises the preparation method of above-mentioned carbon-dioxide absorbent, comprise the sieving of carrier, with absorbent hybrid infusion and dehydration, it is characterized in that:
A. with after the expanded perlite flotation, dry, sieve;
B. by proportioning configuration sodium hydrate aqueous solution, mix, be stirred to even dipping with the perlite carrier of proportional quantity;
C. thermal dehydration in vacuum drying oven.
The optimum condition of heating in vacuum dehydration is: vacuum 5-20 torr, temperature are 100-200 ℃, handle 4-12 hour.
Best granularity after perlite carrier is sieved is the 10-30 order.
Be preparation variable color carbon-dioxide absorbent, can be in the preparation method in above-mentioned b step, the acid-base indicator of proportional quantity with after sodium hydrate aqueous solution mixes, is mixed with the perlite carrier of proportional quantity together, be stirred to even dipping.
Carbon-dioxide absorbent of the present invention adopts that porous is good, Stability Analysis of Structures, cheap perlite be as carrier, improved the specific area of NaOH, it is strong to have the loading capability of holding, absorption efficiency height, advantage capacious, still keep porous preferably behind the absorbing carbon dioxide, vapour lock is low, and vapour lock changes little.Compare with the asbestos carrier, dust is little, and avirulence is easy to prepare, cost is low.The present invention can add acid-base indicator, can clearly show the operating position of absorbent.
Below be embodiments of the invention:
Embodiment 1:
With get granularity after the commercially available expanded perlite flotation after drying, sieve under 120-180 ℃ is 10-30 purpose carrier 100 grams, in 100 ml waters, add NaOH 200 grams, heated solution is to dissolving fully, be mixed into semi-finished product with perlite carrier, with these semi-finished product at 120-130 ℃, vacuum (5-10 torr) was handled 8 hours down, got effective carbon-dioxide absorbent of the present invention after the cooling.
Embodiment 2:
In the sodium hydroxide solution of embodiment 1, add phenolphthalein 0.15 gram, make variable color effective carbon-dioxide absorbent equally with the method for embodiment 1, behind absorbing carbon dioxide, become rose from original khaki.
Embodiment 3:
The expanded perlite granularity is 10-30 order 100 grams, adds NaOH 200 grams, phenolphthalein 0.15 gram in 100 ml waters, yellow 0.10 gram of ground dawn, chrome azurol S 0.05 gram, make efficient variable color carbon-dioxide absorbent similarly to Example 2, behind the absorbing carbon dioxide, become rose from original purple.
Embodiment 4:
Add NaOH 200 grams in 100 ml waters, phenolphthalein 0.2 gram, chromazurine 0.05 gram, all the other compositions and preparation method are with embodiment 2, and the color behind this absorbent absorbing carbon dioxide becomes rose from blue look.
The foregoing description has been done the test that absorptive capacity, vapour lock change, absorb usefulness.
Absorptive capacity is represented with the percentage of the carbon dioxide weight that the Unit Weight absorbent is absorbed.With flow velocity is in the absorption tube of 10% carbon dioxide mix gas of 200 ml/min 15 * 100 millimeters of φ feeding filling arbon dioxide, calculates its absorptive capacity when absorbent is entirely ineffective from weightening finish, and its value is between the 25-38%.For example, embodiment 1 and 2 is that 31.6% embodiment 3 is 28.6%, and embodiment 4 is 28.9%.Compare with commercially available carbon-dioxide absorbent, Carbosorb AS as Britain BDH company, though its nominal absorptive capacity is no less than 35%, but because following vapour lock increases problem, the absorbent that is contained in the absorption tube can't be used fully, therefore, actual absorption Capacity Ratio of the present invention commercially available prod is much better.
The vapour lock of absorbent represents with the gas pressure in the system before the absorbent usually, and it is relevant with factors such as the tightness degree of absorption tube internal diameter, absorbent packed height, filling and gas flow rates.(15 millimeters of absorption tube internal diameters, 50 millimeters of packed heights are knocked closely knit naturally) compares the present invention and commercially available prod under identical conditions.Measure with the U-shaped mercury gage.The result shows that absorbent vapour lock of the present invention is little, changes also little.For example, gas flow rate is almost constant from 0.5 liter of/minute pressure that is increased to 2 liters/time-sharing system, is the 5-6 mm Hg.And the Carbodorb AS of Britain BDH company, the Soda Asbestos of German Merck company and the Ascarite of U.S. Leco company etc. exist vapour lock to increase phenomenon behind absorbing carbon dioxide.As Carbosorb, 10 millimeters of packed heights, gas flow rate is 0.5 liter/timesharing, and system's internal pressure just reaches 820 mm Hg.
Absorb usefulness and be with concentrate the chromatography determination absorbent in the absorbing carbon dioxide gaseous mixture in the tail gas behind the carbon dioxide content of carbon dioxide represent.The measurement result of (15 * 100 millimeters of absorption tube φ, the hydrogen of 4.2% carbon dioxide-carbon dioxide mix gas, gas flow rate 400 ml/min) is as shown in table 1 under similarity condition.By table as seen, its absorption usefulness of absorbent of the present invention is better than commercially available products such as alkali asbestos.
Table 1
| Absorbent | The present invention | The alkali asbestos | Soda lime | ||
| Germany Merck company | U.S. Leco company | Britain BDH company | Shanghai chemical reagent work | ||
| Amount of carbon dioxide in the tail gas (ppb) | 3.3 | 3.5 | 11.9 | 7.2 | 365 |
Claims (9)
1. an effective carbon-dioxide absorbent belongs to the solid absorbent that absorbs gas, and it comprises NaOH, and feature of the present invention is to be carrier with the expanded perlite, and its prescription (percentage by weight) is:
Expanded perlite 20-40%, NaOH 60-80%.
2. by the described carbon-dioxide absorbent of claim 1, the optimum weight ratio that it is characterized in that expanded perlite carrier and NaOH is 1: 2.
3. by claim 1 or 2 described carbon-dioxide absorbents, it is characterized in that adding acid-base indicator as the colour developing indication, its percentage by weight is 0.02-0.20%.
4. by the described carbon-dioxide absorbent of claim 3, it is characterized in that the acid-base indicator that adds, its percentage by weight is 0.05-0.10%.
5. by the described carbon-dioxide absorbent of claim 3, it is characterized in that said acid-base indicator can be phenolphthalein or phenolphthalein, the mixture of dawn Huang, chromazurine.
6. the preparation method of the described carbon-dioxide absorbent of claim 1 comprises sieving, mixing, flood and dewater with absorbent of carrier, it is characterized in that:
A. with after the expanded perlite flotation, dry, sieve;
B. by proportioning configuration sodium hydrate aqueous solution, mix, be stirred to even dipping with the perlite carrier of proportional quantity;
C. thermal dehydration in vacuum drying oven.
7. by the described preparation method of claim 6, it is characterized in that in the said b one step preparation method, the acid-base indicator of proportional quantity with after sodium hydrate aqueous solution mixes, is mixed with the perlite carrier of proportional quantity together, be stirred to even dipping.
8. by claim 6 or 7 described preparation methods, the best granularity that it is characterized in that said perlite carrier is the 10-30 order.
9. by claim 6 or 7 described preparation methods, the optimum condition of wherein said heating in vacuum dehydration is a vacuum 5-20 torr, and temperature is 100-200 ℃, and the processing time is 4-12 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92108508A CN1032044C (en) | 1992-07-20 | 1992-07-20 | High-efficiency serbent for adsorbing CO2 and prodn. method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92108508A CN1032044C (en) | 1992-07-20 | 1992-07-20 | High-efficiency serbent for adsorbing CO2 and prodn. method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1081398A CN1081398A (en) | 1994-02-02 |
| CN1032044C true CN1032044C (en) | 1996-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92108508A Expired - Fee Related CN1032044C (en) | 1992-07-20 | 1992-07-20 | High-efficiency serbent for adsorbing CO2 and prodn. method thereof |
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| CN (1) | CN1032044C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1795979B (en) * | 2004-12-23 | 2010-11-10 | 韩国电力公社 | High strength drying regeneration CO2 adsorbent |
| CN102686298A (en) * | 2009-12-14 | 2012-09-19 | Vm3国际私人有限公司 | Humidity sensitive compositions |
| CN102949863A (en) * | 2012-11-15 | 2013-03-06 | 沈阳理工大学 | Palladium solid phase extraction column with color rendering and indicating functions |
| CN103920381A (en) * | 2013-09-30 | 2014-07-16 | 安徽养和医疗器械设备有限公司 | Carbon dioxide absorbent |
| CN103638895A (en) * | 2013-11-19 | 2014-03-19 | 苏州丹百利电子材料有限公司 | Preparation method of supported acid gas absorbent |
| CN109504268B (en) * | 2017-09-15 | 2021-02-09 | 山西四方恒泰防水材料有限公司 | Preparation method of single-component polyurethane waterproof coating |
| CN114247435B (en) * | 2021-12-25 | 2022-07-22 | 盐城工学院 | A kind of preparation method of organic color-changing material that adsorbs VOCs efficiently |
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1992
- 1992-07-20 CN CN92108508A patent/CN1032044C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1081398A (en) | 1994-02-02 |
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