CN107159104B - Method for compression molding of Chabazite molecular sieve - Google Patents
Method for compression molding of Chabazite molecular sieve Download PDFInfo
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- CN107159104B CN107159104B CN201710334464.XA CN201710334464A CN107159104B CN 107159104 B CN107159104 B CN 107159104B CN 201710334464 A CN201710334464 A CN 201710334464A CN 107159104 B CN107159104 B CN 107159104B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
- B01J20/183—Physical conditioning without chemical treatment, e.g. drying, granulating, coating, irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
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Abstract
The invention relates to the field of Chabazite molecular sieve molding, in particular to a method for compression molding of a Chabazite molecular sieve. The inventors propose to use water as a structural proppant during the compression molding process. The method for compressing the Chabazite molecular sieve can reduce the damage of pressure to the Chabazite molecular sieve, maintain the adsorption performance of the Chabazite molecular sieve, and solve the problem that the adsorption performance of the Chabazite molecular sieve on certain gases such as methane, carbon dioxide and the like is reduced after compression molding. The compression molding method of the Chabazite molecular sieve adopted by the invention has the advantages of simple process, low cost and excellent effect, and can be applied to large-scale production.
Description
Technical Field
The invention relates to the field of Chabazite molecular sieve molding, in particular to a method for compression molding of a Chabazite molecular sieve.
Background
The Chabazite molecular sieve belongs to a rhombohedral system, has a three-dimensional eight-membered ring channel structure, contains a cage column consisting of six-membered rings and Chabazite cages which are alternately arranged, has an eight-membered ring orifice diameter of 0.38nm of × 0.38.38 nm, belongs to a small pore molecular sieve, can be used for adsorbing and storing gases such as carbon dioxide, methane and the like, can also be used for adsorbing and separating VOCs, and is an excellent adsorbent.
The forming processing of the Chabazite molecular sieve is an important link in the application thereof. Regardless of the method used to prepare the adsorbent, the adsorbent must be finally used in the adsorbent bed in a certain size and form, and the adsorbent can be formed into particles with proper shape, size and mechanical strength according to the requirements of the adsorbent bed through shaping processing, so as to fully exert the adsorption performance and selectivity of the adsorbent. Meanwhile, the pressure drop generated by fluid flow can be reduced, channeling is prevented, and uniform fluid flow is obtained.
Compression molding is the earliest and most common molding method used in industry. Compression molding is to place the adsorbent powder into a mold of a certain volume and shape and to compress the adsorbent powder to form the molded adsorbent. The adsorbent with uniform quality, higher bulk density and good strength can be obtained by compression molding, and the method has the advantages of time saving, energy saving, simple and convenient process and the like. However, the compressive strength of the Chabazite molecular sieve is poor, and the framework structure of the Chabazite molecular sieve subjected to compression molding is damaged, so that the adsorption performance is seriously reduced.
Disclosure of Invention
The invention provides a method for compression molding of a Chabazite molecular sieve, aiming at solving the problems that the framework structure of the Chabazite molecular sieve subjected to compression molding is damaged and the adsorption performance is seriously reduced.
The invention is realized by the following technical scheme: a method for compression molding of a Chabazite molecular sieve comprises the following steps:
(1) chabazite molecular sieve water absorption treatment
Adding a structural propping agent into the prepared Chabazite molecular sieve, and fully mixing and standing, wherein the structural propping agent is water or a mixture containing water;
(2) chabazite molecular sieve tablet
Placing the treated Chabazite molecular sieve in a mold, and compressing to obtain a molded Chabazite molecular sieve;
(3) and (3) drying the formed Chabazite molecular sieve obtained in the step (2) to obtain a formed adsorbent.
The invention has the beneficial effects that: the water is used as a structural propping agent in the compression molding process, so that the damage of pressure to the Chabazite molecular sieve can be reduced, the crystal structure of the Chabazite molecular sieve is supported, the adsorption performance of the Chabazite molecular sieve is kept, and the problem that the adsorption performance of the Chabazite molecular sieve on certain gases such as methane, carbon dioxide and the like is greatly reduced after compression molding is solved.
Drawings
FIG. 1 is a schematic view of a shaped adsorbent according to example 1.
Figure 2 is a water adsorption isotherm for the Chabazite molecular sieve. The chart shows that the adsorption capacity of the Chabazite molecular sieve to water vapor is 186.17cm at 0.9bar3The,/g, shows that the Chabazite molecular sieve has stronger adsorption capacity to water.
FIG. 3 is an X-ray diffraction pattern analysis of example 1, example 2 and comparative example 1 and comparative example 2. The figure shows that the main diffraction peak positions of the XRD diffraction peaks of the example 1 and the example 2 are completely consistent with those of the comparative example 1, and the heights of the main diffraction peaks are not obviously changed, which indicates that the formed adsorbent prepared by the invention is not damaged; the major diffraction peak of comparative example 2 was significantly reduced in height compared to comparative example 1, indicating a more severe disruption of the crystal structure of comparative example 2.
FIG. 4 is a 273K methane isothermal adsorption curve for example 1, example 2 and comparative example 1, comparative example 2. The graphs show that the methane adsorption amounts of example 1 and example 2 and comparative example 1 and 2 at 273K and 1bar are 20.53cm3/g、16.86cm3/g、22.42cm3/g、9.86cm3(ii) in terms of/g. The methane adsorption capacity of the samples 1 and 2 prepared by the method of the invention at 273K and 1bar is reduced less than that of the sample 1(Chabazite molecular sieve raw powder); compared with comparative example 2 (without adding structural proppant and directly molding), the composite material is improved by 115 percent and 70 percent respectively.
FIG. 5 is a 273K carbon dioxide isothermal adsorption curve for example 1, example 2 and comparative example 1, comparative example 2. The figure shows that the carbon dioxide adsorption amounts at 273K and 1bar of example 1 and example 2 and comparative example 1 and comparative example 2 are respectively: 64.01cm3/g、62.08cm3/g、64.57cm3/g、56.13cm3(ii) in terms of/g. The carbon dioxide adsorption capacity of the carbon dioxide prepared by the method of the invention in the embodiment 1 and the embodiment 2 under 273K and 1bar is reduced less than that of the carbon dioxide adsorbed by the carbon dioxide prepared by the method of the invention in the comparative example 1(Chabazite molecular sieve raw powder); compared with comparative example 2 (without adding structural proppant and directly molded), the weight is respectively improved by 14 percent and 11 percent.
Fig. 6 is a graph of pore size distribution for example 1, example 2 and comparative example 1, comparative example 2. As can be seen from the figure: the pore volumes of examples 1 and 2 prepared by the method of the present invention were significantly improved compared to comparative example 2, which was directly compression molded without the addition of structural proppant.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The method for the Chabazite molecular sieve compression molding process of the present invention is described in detail below.
A method for compression molding of a Chabazite molecular sieve comprises the following steps:
(1) chabazite molecular sieve water absorption treatment
Adding a structural propping agent into the prepared Chabazite molecular sieve, and fully mixing and standing, wherein the structural propping agent is water or a mixture containing water;
(2) chabazite molecular sieve tablet
Placing the treated Chabazite molecular sieve in a mold, and compressing to obtain a molded Chabazite molecular sieve;
(3) and (3) drying the formed Chabazite molecular sieve obtained in the step (2) to obtain a formed adsorbent.
The Chabazite molecular sieve is an excellent adsorbent, but due to the poor compressive strength, after compression molding, the crystal structure collapses, the pore channels are damaged, and the specific surface area and the adsorption capacity are reduced. The inventors propose to use water as a structural proppant during the compression molding process. The method for compressing the Chabazite molecular sieve can reduce the damage of pressure to the Chabazite molecular sieve, maintain the adsorption performance of the Chabazite molecular sieve, and solve the problem that the adsorption performance of the Chabazite molecular sieve on certain gases such as methane, carbon dioxide and the like is reduced after compression molding. The compression molding method of the Chabazite molecular sieve adopted by the invention has the advantages of simple process, low cost and excellent effect, and can be applied to large-scale production.
The structural proppant of the present invention is water or a mixture containing water. In practice, one skilled in the art can add any aqueous solution, such as potassium chloride solution, sodium chloride solution, etc., depending on the need for the adsorbent.
Specifically, in order to further reduce the damage of the pressure to the Chabazite molecular sieve, the addition amount of water is preferably 10 to 50 percent of the mass of the formed Chabazite molecular sieve, and more preferably 30 percent.
In specific implementation, the adding mode of the water comprises an impregnation method and a water vapor absorption method. Of course, the water addition method of the present invention is by no means only two methods, and the skilled person can select the appropriate water addition method according to the actual needs. Specifically, the impregnation method is to take the prepared Chabazite molecular sieve, add a certain amount of structural proppant, fully mix, seal and stand for a period of time at room temperature. The steam absorption method comprises placing the prepared Chabazite molecular sieve in a container, placing in a vacuum drier with distilled water at the bottom, covering the vacuum drier, and standing for a certain time.
In order to ensure that water can be fully and uniformly mixed with the Chabazite molecular sieve, the standing time is 1-24 h. The preferred standing time is 12 h.
In specific applications, those skilled in the art can select appropriate pressure and pressure holding time according to the requirements of the adsorption bed (shape, size and mechanical strength of adsorbent required) based on the concept of the present invention. Preferably, the pressure of the compression is 5-15MPa, and the holding time of the pressure is 0.5-5 min. More preferably, the pressure is 10MPa and the dwell time is 1 min.
The technical scheme provided by the invention can be suitable for various Chabazite molecular sieves, such as K-Chabazite, Na-Chabazite, Ca-Chabazite, L i-Chabazite, Cs-Chabazite or H-Chabazite, preferably, the silicon-aluminum ratio of the Chabazite molecular sieves is between 1.6 and 3.
In some cases, one skilled in the art may, depending on the actual situation, subject the shaped Chabazite molecular sieve to crushing of the block shaped Chabazite molecular sieve (close to granular form, as shown in FIG. 1), followed by drying to obtain the shaped adsorbent (alternative to step (3) above). The block-shaped adsorbent can be directly placed in adsorption beds of various shapes and sizes in a pile.
In the preparation method, the Chabazite molecular sieve or the blocky formed Chabazite molecular sieve is formed, preferably, the drying temperature is 150 ℃, and the drying time is 6 hours.
Further, the invention provides application of the formed adsorbent obtained by the method for the Chabazite molecular sieve compression molding in methane and carbon dioxide gas adsorption.
Comparative example 1
The preparation method of the Chabazite molecular sieve raw powder comprises the following steps:
heating a mixture of distilled water, potassium hydroxide and distilled water in a molar ratio of 18:3.6:1 until the solution becomes clear and transparent (the amount of the distilled water is kept unchanged all the time), and cooling at room temperature for standby.
Mixing the clear and transparent solution with water, adding silica sol, stirring (about 10 min) until the mixture becomes homogeneous, and adding Sr (NO)3)2Continuously stirring for 10min, wherein the molar ratio of the added raw materials is KOH: Sr (NO)3)2:SiO2:Al2O3:H2O ═ 3.6:0.1:6:1: 130. Transferring the mixture into a 23ml high-pressure reaction kettle with a polytetrafluoroethylene lining, reacting for 5 days at 423K (150 ℃), after crystallization is finished, washing and filtering the mixture for many times by using distilled water, and drying the mixture for 5 hours under 423K in vacuum to obtain K-Chabazite.
Example 1
A method for compression molding of a Chabazite molecular sieve comprises the following steps:
(1) chabazite molecular sieve water absorption treatment
The 1g K-Chabazite molecular sieve prepared in comparative example 1 was taken, 1ml of distilled water (50 wt%) was added, and mixed well. The mixture was sealed and allowed to stand at room temperature for 12 hours.
(2) Chabazite molecular sieve tabletting and crushing
The treated powder of Chabazite molecular sieve was placed in a mold and compressed at 10MPa using a tablet press, maintaining the pressure for 1 minute. And taking out the formed flaky Chabazite molecular sieve, crushing and screening to obtain the blocky formed Chabazite molecular sieve. (3) And (3) putting the blocky formed Chabazite molecular sieve prepared in the step (2) into an oven at 150 ℃ for drying for 6 hours to obtain a formed adsorbent.
The tablet press used in this example was a model 769YP-15A model of tianjin kojiu high and new technology limited, and a model MJ common cylindrical die. The following examples and comparative examples were carried out using the same equipment as in example 1.
Example 2
A forming method for a Chabazite molecular sieve comprises the following steps:
(1) chabazite molecular sieve water absorption treatment
The 1g K-Chabazite molecular sieve prepared in comparative example 1 was taken and placed in a weighing bottle, and then in a vacuum drier with distilled water at the bottom, the vacuum drier was covered, and the mixture was allowed to stand for 12 hours, and the weight of the mixture was 1.3g (23 wt% water) after the Chabazite molecular sieve was measured to absorb water.
(2) Same as in step (2) of example 1.
(3) The same procedure as in step (3) of example 1.
Comparative example 2
The 1gK-Chabazite prepared in comparative example 1 was placed in a mold and compressed at 10MPa using a tablet press for 1 minute. And taking out the formed flaky Chabazite molecular sieve, crushing and screening to obtain the blocky formed Chabazite molecular sieve.
The specific surface area of examples 1 to 2 and comparative examples 1 to 2 was measured, and the results are shown in the following table:
as can be seen from the table, the specific surface areas of the example 1 and the example 2 prepared by the method of the invention are not changed much compared with the comparative example 1(Chabazite molecular sieve raw powder); compared with comparative example 2 (without adding structural proppant and directly molding) by 14 percent and 10 percent respectively.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A method for compression molding of a Chabazite molecular sieve is characterized by comprising the following steps:
(1) chabazite molecular sieve water absorption treatment
Taking the prepared Chabazite molecular sieve, adding a structural propping agent, fully mixing and standing, wherein the structural propping agent is water, and the adding amount of the water accounts for 30-50% of the mass of the formed Chabazite molecular sieve;
(2) chabazite molecular sieve tablet
Placing the treated Chabazite molecular sieve in a mold, and compressing to obtain a molded Chabazite molecular sieve;
(3) and (3) drying the formed Chabazite molecular sieve obtained in the step (2) to obtain a formed adsorbent.
2. The method for Chabazite molecular sieve molding according to claim 1, wherein the water is added by a method comprising an immersion method and a water vapor absorption method.
3. The method for Chabazite molecular sieve compression molding according to claim 2, wherein the standing time is 1-24 h.
4. The method for Chabazite molecular sieve compression molding according to claim 3, wherein the pressure of the compression is 5-15MPa, and the retention time of the pressure is 0.5-5 min.
5. The method as claimed in claim 4, wherein the Chabazite molecular sieve is K-Chabazite, Na-Chabazite, Ca-Chabazite, L i-Chabazite, Cs-Chabazite or H-Chabazite.
6. The method as claimed in claim 5, wherein the Chabazite molecular sieve has a Si/Al ratio of 1.6-3.
7. The method as claimed in claim 6, wherein the formed Chabazite molecular sieve is crushed to form a block-shaped Chabazite molecular sieve, and then dried to obtain the formed adsorbent.
8. Use of a shaped adsorbent obtained by a method for the compression molding of a Chabazite molecular sieve according to any one of claims 1 to 7 in the adsorption of methane and carbon dioxide gas.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1802214A (en) * | 2003-06-06 | 2006-07-12 | 巴斯福股份公司 | Method for increasing the cutting hardness of a molded body |
| JP2012091997A (en) * | 2010-09-28 | 2012-05-17 | Jgc Catalysts & Chemicals Ltd | Crystalline silica aluminophosphate and method of synthesizing the same |
| CN103635248A (en) * | 2011-05-09 | 2014-03-12 | 日立造船株式会社 | Zeolite-membrane separation/recovery system for CO2 |
| JP2015187064A (en) * | 2014-03-13 | 2015-10-29 | 三菱化学株式会社 | Zeolite molding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4380859B2 (en) * | 1999-11-29 | 2009-12-09 | 三菱瓦斯化学株式会社 | Catalyst molded body |
| JP4182330B2 (en) * | 2002-07-17 | 2008-11-19 | 三菱瓦斯化学株式会社 | Shabasite-type crystalline silicoaluminophosphate molecular sieve compression compression molding and molding method |
| CN103028374B (en) * | 2012-12-28 | 2014-12-17 | 天津众智科技有限公司 | 5A molecular sieve with high adsorption rate |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1802214A (en) * | 2003-06-06 | 2006-07-12 | 巴斯福股份公司 | Method for increasing the cutting hardness of a molded body |
| JP2012091997A (en) * | 2010-09-28 | 2012-05-17 | Jgc Catalysts & Chemicals Ltd | Crystalline silica aluminophosphate and method of synthesizing the same |
| CN103635248A (en) * | 2011-05-09 | 2014-03-12 | 日立造船株式会社 | Zeolite-membrane separation/recovery system for CO2 |
| JP2015187064A (en) * | 2014-03-13 | 2015-10-29 | 三菱化学株式会社 | Zeolite molding |
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