CN102247801A - Application of sodium form low-silicon X-type molecular sieve raw powder to preparation of adsorbent - Google Patents
Application of sodium form low-silicon X-type molecular sieve raw powder to preparation of adsorbent Download PDFInfo
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- CN102247801A CN102247801A CN2011101377336A CN201110137733A CN102247801A CN 102247801 A CN102247801 A CN 102247801A CN 2011101377336 A CN2011101377336 A CN 2011101377336A CN 201110137733 A CN201110137733 A CN 201110137733A CN 102247801 A CN102247801 A CN 102247801A
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- molecular sieve
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention discloses an application of sodium form low-silicon X-type molecular sieve raw powder to the preparation of an adsorbent. The molar ratios of components of the molecular sieve raw powder are as follow: the molar ratio of K2O to Al2O3 is equal to 0-0.05; the molar ratio of Na2O to Al2O3 is equal to 0.95-1.00; the molar ratio of SiO2 to Al2O3 is equal to 2.0-2.1; the molar ratio of (K2O+Na2O) to Al2O3 is equal to 1.00; the molecular sieve raw powder is used for preparing the adsorbent in an oxygen generation process; and H2O and CO2 in raw material air are removed by purifying the raw material air. The adsorption capacities of the NaLSX raw powder to water and CO2 are increased by 6-8 percent and 10-15 percent compared with the adsorption of a synthetic KNaLSX molecular sieve; the adsorption rate is high and the cost is low; and the molecular sieve raw powder is more superior for preparing the adsorbent in the oxygen generation process.
Description
Technical field
The present invention relates to a kind of sieve technology, relate to the application of a kind of sodium-type low-silicon X-type molecular sieve raw powder on the preparation adsorbent specifically.
Technical background
Low-silicon X-shaped molecular screen is called for short LSX, works as SiO
2/ Al
2O
3Mol ratio is 2.0-2.1, and its cation-bit reaches maximum, has maximum adsorption sites.Common sodium-type low-silicon X-type molecular sieve is called for short NaLSX.The low-silicon X-shaped molecular screen that molecular sieve synthesizes in the K-Na mixed system contains Na
+And K
+Two kinds of cations also can be called for short KNaLSX, wherein K
+Account for 25%, Na
+Account for 75%.At present, the existing lot of documents report of the preparation method of KNaLSX molecular sieve, but synthesis type low-silicon X-shaped molecular screen KNaLSX is also not obvious to the superiority of the absorption of water and carbon dioxide.From cation absorption property is influenced consideration, sodium-type low-silicon X-type molecular sieve, the performance more superior to being adsorbed with of water and carbon dioxide.But with the sodium type X type molecular sieve of synthetic method preparation, its SiO
2/ Al
2O
3Mol ratio is at 2.35-2.55, and directly synthetic method can not prepare SiO
2/ Al
2O
3Mol ratio is the sodium-type low-silicon X-type molecular sieve NaLSX of (2.0-2.1).
The technical current demand that the raising low-silicon X-shaped molecular screen is arranged the adsorption capacity of water and carbon dioxide.But, also directly not synthetic at present SiO
2/ Al
2O
3Mol ratio is the technology of the higher low-silicon X-shaped molecular screen of the adsorption capacity to water and carbon dioxide of 2.0-2.1.
Summary of the invention
Technical problem to be solved of the present invention is to provide a kind of sodium-type low-silicon X-type molecular sieve raw powder, can have than the high-adsorption-capacity and the rate of adsorption water and carbon dioxide.
The technical problem that the present invention further solves provides a kind of preparation method of above-mentioned molecular screen primary powder.
The technical problem that the present invention further solves provides the application of a kind of above-mentioned molecular screen primary powder on the preparation adsorbent.
In order to reach the purpose that solves the problems of the technologies described above, a kind of sodium-type low-silicon X-type molecular sieve raw powder of the present invention, the mol ratio of each component is: K
2O/Al
2O
3=0-0.05; Na
2O/Al
2O
3=0.95-1.00; SiO
2/ Al
2O
3=2.0-2.1, wherein (K
2O+Na
2O)/Al
2O
3=1.00.
Described a kind of sodium-type low-silicon X-type molecular sieve raw powder, its further the mol ratio of preferred each component can be K
2O/Al
2O
3=0-0.02; Na
2O/Al
2O
3=0.98-1.00.
Described a kind of sodium-type low-silicon X-type molecular sieve raw powder, its further the mol ratio of preferred each component can also be SiO
2/ Al
2O
3=2.0.
A kind of sodium-type low-silicon X-type molecular sieve raw powder, preparation method thereof of the present invention, its step is as follows:
1, according to preparation mol ratio SiO
2/ Al
2O
3The potassium sodium-type low-silicon X-type molecular sieve KNaLSX prior art of=2.0-2.1, preparation SiO
2/ Al
2O
3The potassium sodium-type low-silicon X-type molecular sieve KNaLSX of=2.0-2.1.Concrete technology of preparing scheme can be according to Gunter H.Kuhl in Zeoliters(1987) method that provides for " Crystallization of low-silica Faujasite " paper of 7 phase the 451st page heads.
2, use NaCl, the NaNO of 0.5-1.5M
3And Na
2SO
4A kind of solution in the solution or its mixed solution and KNaLSX molecular sieve carry out Na
+Exchange is pressed NaCl and is calculated, butt KNaLSX/ butt NaCl mass ratio=(1.5-2.3)/1, Na
+The exchange temperature is 70-75 ℃, time 1-2 hour, filter, and repeat 2-3 time, be washed till no Cl
-, the NaLSX molecular sieve is made in oven dry.
A kind of sodium-type low-silicon X-type molecular sieve raw powder, preparation method thereof of the present invention, further concrete technical scheme can be: described NaCl, NaNO
3And Na
2SO
4The used Na that contains in a kind of solution in the solution or its mixed solution
+The CaO/MgO mass content is less than 0.02% in the salt, and PH is 6.5-8.5.
A kind of sodium-type low-silicon X-type molecular sieve raw powder, preparation method thereof of the present invention, further concrete technical scheme can also be: described NaCl, NaNO
3And Na
2SO
4Used deionized water and washing process deionized water in a kind of solution in the solution or its mixed solution, its CaO/MgO content calculate by CaO and are lower than 5mg/l.
A kind of sodium-type low-silicon X-type molecular sieve raw powder, preparation method thereof of the present invention, further concrete technical scheme can also be: described NaCl, NaNO
3And Na
2SO
4A kind of solution in the solution or its mixed solution with KNaLSX molecular sieve exchange process in repeatedly recycle, the method that recycles is for containing Na through exchange
+Measure low NaCl, NaNO
3And Na
2SO
4A kind of solution in the solution or its mixed solution with contain K
+Measure the contact earlier of high molecular sieve, then the K that contains through replacing
+Measure low molecular sieve again with contain Na
+Measure high NaCl, NaNO
3And Na
2SO
4A kind of solution or its mixed solution in the solution further exchange.
NaLSX molecular screen primary powder of the present invention, its application comprise the adsorbent that is used for preparing oxygen technology and as the raw material of preparation LiLSX molecular sieve making oxygen by air separation adsorbent.The consumption maximum be the adsorbent that is used for preparing oxygen technology, raw air is purified, remove H wherein
2O and CO
2, its adsorbance and the rate of adsorption compare SiO
2/ Al
2O
3The common X molecular sieve and the KNaLSX molecular screen primary powder of=2.35-2.55 molar ratio are more superior; When conduct prepares the raw material of LiLSX molecular sieve making oxygen by air separation adsorbent, at Li
+Make raw material ratio with NaLSX in the exchange process and make raw material with KNaLSX, the process that reclaims Li in the filtrate is easier, can improve the utilization rate of Li, reduces the LiLSX manufacturing cost.
The KNaLSX molecular sieve of preparation in its step 1, at 25 ℃, P/P
0Under=0.21 the situation, the cyclohexane saturated extent of adsorption is 17.0%, and at 25 ℃, under the situation of relative humidity 50%, water absorption is 30.0%, at 25 ℃, and under the situation of pressure 250mmHg, CO
2Adsorbance is 20.0%.
Sodium-type low-silicon X-type provided by the invention (NaLSX) molecular sieve than synthesis type KNaLSX molecular sieve to water and CO
2Adsorption capacity improve 6-8% and 10-15% respectively.
By adopting above-mentioned technical scheme, the former powder of the NaLSX that a kind of sodium-type low-silicon X-type molecular sieve raw powder of the present invention and preparation method thereof provides, its Na
+Exchange degree height, molecular sieve crystallinity height, adsorption capacity is big, the rate of adsorption is fast, cost is low, has better to remove H in the air
2O and CO
2Ability; Raw material as preparation LiLSX molecular sieve making oxygen by air separation adsorbent is more superior.
The specific embodiment
Below by example technology of the present invention is awarded further instruction, but the claimed content of the present invention is not limited to these examples.
Raw material used in following examples is:
KNaLSX(is low-silicon X-shaped) molecular sieve: by Gunter H.Kuhl in Zeoliters(1987) method that provides for " Crystallization of low-silica Faujasite " paper of 7 phase the 451st page heads, preparation mol ratio SiO
2/ Al
2O
3=2.0 potassium sodium-type low-silicon X-type molecular sieve KNaLSX, during its mol ratio is formed, SiO
2/ Al
2O
3=2.0, K
2O/(K
2O+Na
2O)=and 0.20-0.25, (K
2O+Na
2O)/Al
2O
3=1.00.At 25 ℃, P/P
0Under=0.21 the situation, the cyclohexane saturated extent of adsorption is 17.0%; At 25 ℃, under the situation of relative humidity 50%, water absorption is 30.0%; At 25 ℃, under the situation of pressure 250mmHg, CO
2Adsorbance is 20.0%.
Contain Na salt and select refining NaCl for use, the NaCl mass content is greater than 99.5%, and the CaO/MgO mass content is less than 0.02%.
Deionized water: CaO/MgO content is less than 5mg/l.
Embodiment 1:
The NaCl solution that with 600ml concentration is 1.1M earlier adds in the exchange still, under agitation the former powder of 38 gram KNaLSX is slowly added in the still, is warming up to 70 ℃ gradually, constant temperature 45 minutes filters, with the washing of 600ml deionized water, the triplicate exchange is washed till no Cl for the last time
-, dry under 110 ℃, promptly get the NaLSX product, record Na
+Exchange degree is 98.60%, and water absorption is 31.77%, CO
2Adsorbance is 22.51%.
Embodiment 2:
60 liters of NaCl solution with 1.1M add in the exchange still earlier, under agitation the former powder of 3.8kg KNaLSX are slowly added in the still, are warming up to 75 ℃ gradually, and constant temperature 1 hour filters, and with 60 liters of deionized water washings, the triplicate exchange is washed till no Cl for the last time
-, dry under 110 ℃, promptly get the NaLSX product, record Na
+Exchange degree is 98.48%, and water absorption is 31.80%, CO
2Adsorbance is 22.56%.
Embodiment 3:
As the operation of embodiment 2, be the Na first time
+The filtrate that exchanges for the third time in the exchange use-case 2, twice Na in back
+Exchange with fresh NaCl solution, product Na
+Exchange degree is 98.45%, and water absorption is 31.80%, CO
2Adsorbance is 22.50%.
Claims (3)
1. the application of sodium-type low-silicon X-type molecular sieve raw powder on the preparation adsorbent, it is characterized in that: the mol ratio of each component of molecular screen primary powder is: K
2O/Al
2O
3=0-0.05, Na
2O/Al
2O
3=0.95-1.00, SiO
2/ Al
2O
3=2.0-2.1, (K
2O+Na
2O)/Al
2O
3=1.00; Molecular screen primary powder is used for preparing the adsorbent of oxygen technology, and raw air is purified, and removes H wherein
2O and CO
2
2. the application of sodium-type low-silicon X-type molecular sieve raw powder on the preparation adsorbent according to claim 1, it is characterized in that: the mol ratio of described each component of molecular screen primary powder is: K
2O/Al
2O
3=0-0.02; Na
2O/Al
2O
3=0.98-1.00.
3. the application of sodium-type low-silicon X-type molecular sieve raw powder on the preparation adsorbent according to claim 1, it is characterized in that: the mol ratio of described each component of molecular screen primary powder is: SiO
2/ Al
2O
3=2.0.
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|---|---|---|---|
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174356A (en) * | 2014-08-20 | 2014-12-03 | 洛阳市建龙化工有限公司 | Preparation method of potassium-free low-aluminum-silicon-ratio X-type molecular sieve adsorbent |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717094A (en) * | 2009-11-23 | 2010-06-02 | 洛阳市建龙化工有限公司 | Sodium-type low-silicon X-type molecular sieve raw powder and preparation method thereof |
-
2011
- 2011-05-26 CN CN2011101377336A patent/CN102247801A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101717094A (en) * | 2009-11-23 | 2010-06-02 | 洛阳市建龙化工有限公司 | Sodium-type low-silicon X-type molecular sieve raw powder and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174356A (en) * | 2014-08-20 | 2014-12-03 | 洛阳市建龙化工有限公司 | Preparation method of potassium-free low-aluminum-silicon-ratio X-type molecular sieve adsorbent |
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Application publication date: 20111123 |