CN1105598C - Manufacturing method of granulated complex molecular sieve composition having multi-functions - Google Patents
Manufacturing method of granulated complex molecular sieve composition having multi-functions Download PDFInfo
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- CN1105598C CN1105598C CN96123200A CN96123200A CN1105598C CN 1105598 C CN1105598 C CN 1105598C CN 96123200 A CN96123200 A CN 96123200A CN 96123200 A CN96123200 A CN 96123200A CN 1105598 C CN1105598 C CN 1105598C
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Abstract
The present invention relates to a manufacturing method of a multifunctional granular compound molecular sieve composition. Since the composition has the advantages of various adsorption capacities, favorable abrasion resistance and convenient processing, the composition is used as a removing agent for harmful gas in cigarettes or as a purifying agent for water purification, etc. The present invention particularly relates to a preparing method which comprises: the composition is granulated by mixing an alkali metal silicate water solution and various types of mixtures of zeolite and active carbon; the composition is treated by an alkaline earth metal brine solution without being calcinated, and the composition is dried.
Description
The present invention relates to a method for preparing a multifunctional granular composite molecular sieve composition useful as a remover of harmful gases of cigarettes or a purifier for water purification, etc. due to various adsorption capacities, good abrasion resistance and convenient processing, and more particularly, to a method for preparing the same, which comprises: granulating by mixing an aqueous solution of alkali metal silicate with a mixture of various types of zeolite and activated carbon powder, treating with an aqueous solution of an alkaline earth metal salt without calcination, and drying.
The zeolite is a crystalline aluminosilicate of the following formula (I):
Mx/n[(A1O2)x(SiO2)y]wH2o (I) wherein M is a cation,
n is the valence of the cation,
w is the number of water molecules and the ratio y/x is generally from 1 to 5, depending on the structure.
Since the zeolite has a minute pore size of about 3 to 10 Å, it functions as a molecular sieve.
Particularly as a hydrophilic adsorbent, which has a strong adsorption capacity for polar molecules such as water and whose adsorption capacity is large even at a low partial pressure and high temperature.
The activated carbon is prepared by carbonizing coconut shell, coal or wood, etc. and activating under reduced pressure.
The particles are in the form of granules, chips or powders, and have a pore size of 1-100nm, mostly below 2 nm. The active carbon is hydrophobic adsorbent, has strong adsorption force to nonpolar molecules, and has a specific surface area of 1200m2More than g.
As described above, zeolite is a hydrophilic adsorbent and activated carbon is hydrophobic, and a method of preparing a multifunctional adsorbent by mixing zeolite and activated carbon and a method of preparing a composition by combining an active carbonized substance and a zeolite-type substance or mixing a silicate compound and activated carbon have been frequently reported recently in order to mutually promote their adsorption capacities.
In this connection, Japanese unexamined patent publication No. 54-53669 discloses a method of producing zeolite by adding bentonite and sugar to a mixture of zeolite and activated carbon. Followed by shaping, drying and calcining to prepare the composition for ozonolysis.
However, this method uses natural clay such as bentonite as an inorganic binder, and therefore, the final product includes impurities.
And since the natural clay binder is a water-insoluble compound, its plasticity becomes low when mixed with water, and therefore, in order to form a desired shape, it is necessary to maintain its plasticity by adding a water-soluble polymer-based compound as an organic binder.
Since bentonite swells in water and the composition dissolves, drying and calcination under reduced pressure are necessary to prevent this and to carbonize the sugar as an organic binder.
Therefore, this method requires complicated calcination equipment and great expense, and has a problem in that abrasion resistance and adsorption capacity are reduced as the specific surface area is reduced due to shrinkage of bentonite during calcination, thereby generating large dust.
Since volatile oil generated during the carbonization of the organic binder pollutes the air, the method requires a set of system for removing the pollutants.
Japanese unexamined patent No. 4-4039 discloses a method for producing a wastewater treatment agent utilizing oil adsorption capacity by adding blast furnace slag powder to zeolite. This method causes an ecological safety problem due to the blast furnace slag component and is difficult in granulation processing and low in hydrophobic adsorption capacity due to poor plasticity.
Japanese unexamined patent publication No. 59-69146 discloses a method for producing a filtration phase adsorbent by adding bentonite and a silicate compound to activated carbon. This method also has a problem that pores of the activated carbon are clogged with bentonite and silicate compounds and hydrophilic adsorption capacity thereof by the action of molecular sieves is also low.
In order to overcome the problems of the prior art, the present inventors have studied a technology for improving the plasticity and wear resistance of a product by adding alkaline earth metal silicate as an inorganic binder and syrup as an organic binder to a mixture of zeolite and activated carbon (korean patent application 94-18327). However, this method also causes the problems due to the calcination process and thus limits the increase of the adsorption capacity and the specific surface area.
Accordingly, the present inventors have endeavored to solve the problems of the prior art. As a result, the present inventors have studied a composition manufacturing method comprising: (a) preparing a granular composition by adding an aqueous alkali metal silicate solution having good plasticity to a mixture of zeolite and activated carbon, (b) directly adding the composition to an aqueous alkaline earth metal salt solution without calcination, and drying.
In this manner, in the present invention, the water-soluble alkali metal silicate used is converted into the water-insoluble alkaline earth metal silicate without using an organic binder alone, and therefore, the abrasion resistance of the granular composition becomes high and its dissolution in water is suppressed, while the inorganic binder also has an adsorption ability, and the specific surface area of the granular composition can be greatly increased since the zeolite contained in the granular composition is converted into the alkaline earth metal type zeolite.
The present invention aims to provide a process for producing a multifunctional granular composite molecular sieve composition which can be used for adsorption of water and an organic solvent, separation of substances by molecular sieve action, and the like.
The invention relates to a method for preparing a granular composite molecular sieve composition, which is characterized by comprising the following steps: an aqueous alkali metal silicate solution is added to a mixture of zeolite and activated carbon powder, which is then granulated and impregnated with an aqueous alkaline earth metal salt solution.
The present invention is described in more detail below.
The present invention relates to a method for preparing a granular composite molecular sieve composition having various absorption capacities by generating micropores.
First, after mixing the zeolite a powder and the activated carbon powder, they were put into a plow mixer and then mixed well.
Then, an aqueous alkali metal silicate solution was sprayed and mixed with a nozzle to produce 0.2 to 5mm particles.
Besides the a-type zeolite, X, Y, ZSM-type zeolite, natural zeolite, or the like can be used.
In the present invention, the activated carbon is made of coconut shell, and is in the form of powder, and its specific surface area is greater than 1000m2(ii) in terms of/g. It is also possible to use lignite-based, bituminous, wood-based activated carbon.
An aqueous solution of sodium silicate or an aqueous solution of potassium silicate is used as the aqueous solution of the alkali metal silicate, and an aqueous solution containing 15 to 38% by weight of sodium silicate is used as the aqueous solution of sodium silicate. In addition to the plowshare mixer as the granulating device, a rotary granulator, an extruder, a fluid bed granulator or a tablet press can be used.
By adding said granular composition to an aqueous alkaline earth metal salt solution, the alkali metal silicate component contained as a binder is converted into an insoluble alkaline earth metal silicate, and at the same time, said type 4A zeolite is converted into type A alkaline earth metal zeolite. Then, if it is to be used thereinRemoving the fluidized component and drying with a fluidized bed dryer to obtain the granular composite molecular sieve groupA compound (I) is provided. Calcium chloride (CaCl)2) Aqueous solution or magnesium chloride (MgCl)2) As the aqueous solution of an alkaline earth metal used in the present invention, an aqueous solution containing 10 to 45% by weight of calcium chloride may be used as the calcium chloride solution. When using alkaline earth metal salts such as (CaCl)2) The specific chemical reactions that take place on the zeolite and silicate are as follows:
(1) zeolite
Na12[(AlO2)12·(SiO2)12]·27H2O+6CaCl2+3H2O
Type 4A (specific surface area: less than 10 m)2/g)。
→Ca6[(AlO2)12·(SiO2)12]·30H2O+12NaCl
5A type (specific surface area: more than 500 m)2/g)
(2) Silicates of acid or alkali
Calcium silicate
(Water-soluble) (Water-insoluble)
As mentioned above, one advantage of the present invention is the omission of the known pretreatment process of converting zeolite powder to alkaline earth metal zeolite powder. And by preparing the water-insoluble alkaline earth metal silicate by this method, the binding power and water resistance of the granular composition are greatly improved, and therefore, the high-temperature calcination process which is inevitably carried out in the known production method is not required in the present invention.
The granular composite molecular sieve composition prepared according to the present invention contains 20 to 60% by weight of zeolite, 15 to 50% by weight of activated carbon and 10 to 35% by weight of alkaline earth metal silicate as solid components. When the content of the above components is less than or exceeds these ranges, it is difficult to obtain hydrophobic/hydrophilic adsorption capacity and to obtain a granular composition having desired attrition resistance, and there is a problem in that the adsorption capacity is low because the micropores of the adsorbent are severely clogged.
Said granular composition having a number of characteristics, such as a specific surface area greater than 500m2Iodine absorption of more than 320mg/g has a decolorizing capacity of more than 65mg/g for methylene blue and an abrasion resistance of more than 99.5%.
Therefore, the granular composition of the present invention has good moldability and wear resistance and does not require calcination processing, and its adsorption capacity is not reduced by the binder.
Therefore, the granular composition can be used for absorption of water, organic solvents and toxic gases, treatment of industrial water and sewage, and material separation using molecular sieve characteristics, and in particular, can be used as a harmful gas remover in cigarettes, a purifier for water purification, an air purifier, a deodorant, a catalyst, an adsorbent carrier, and the like. The invention is represented by the following examples, which are intended to be exemplary only.
Example 1:
13.0kg of 4A type zeolite powder (water content: 5.6% by weight) and 6.5kg of activated carbon powder (water content: 6.2% by weight) were put into a 1301 volume ploughshare mixer (Lodige, Germany) and mixed for 6 minutes at a spindle speed of 200 rpm and a chopper speed of 3600 rpm.
A solution prepared by mixing 12.5kg of an aqueous sodium silicate solution (K, S standard, No. 3 water glass) with 2.5kg of water was injected into the mixture through a nozzle for 8 minutes and stirred, followed by granulation for 15 minutes. Thus, a granular composition having an average diameter of 1.2mm was obtained. The granular composition was added to an aqueous solution of 6.2kg of calcium chloride in 16.0kg of water and dissolved at 75 ℃ for 1 hour. Then filtered through a 60 mesh screen and the filtrate removed. 15.0kg of moisture were added twice to the residual material at 70 ℃ and washed, followed by drying at 90 ℃ with a fluidized bed dryer.
Finally, 24.1kg of a granular composite molecular sieve composition (water content: 4.3% by weight) was obtained. The physical properties of the composition are shown in the following table.
Example 2:
10.0kg of 4A type zeolite powder (water content: 5.6% by weight) and 9.5kg of activated carbon powder (water content: 6.2% by weight) were put into a 130l capacity plowshare mixer (Lodige, Germany) and mixed for 6 minutes at a spindle speed of 200 rpm and a chopper speed of 3600 rpm.
A solution prepared by mixing 13.0kg of an aqueous sodium silicate solution (K.S standard, No. 3 water glass) and 3.2kg of water was injected into the mixture through a nozzle for 8 minutes and mixed, followed by granulation for 15 minutes. This gave a granular composition having an average diameter of 1.3 mm. The granular composition was added to 5.6kg of calcium chloride in 16.0kg of water and the resulting aqueous solution at 75 ℃ was dissolved and treated for 1 hour. Then filtered through a 60 mesh screen and the filtrate removed. 15.0kg of moisture were added twice to the residual mass at 70 ℃ and rinsed, after which it was dried at 90 ℃ with a fluidized bed dryer.
Finally, 24.3kg of a granular composite molecular sieve composition (water content: 4.5% by weight) was obtained. The physical properties of the composition are shown in the following table.
Example 3:
15.0kg of 4A type zeolite powder (water content: 5.6% by weight) and 4.5kg of activated carbon powder (water content: 6.2% by weight) were put into a 1301 volume ploughshare mixer (Lodige, Germany) and mixed for 6 minutes at a spindle speed of 200 rpm and a chopper speed of 3600 rpm.
A solution prepared by mixing 11.3kg of an aqueous sodium silicate solution (K.S standard, No. 3 water glass) with 2.3kg of water was injected into the mixture through a nozzle for 8 minutes and stirred, followed by granulation for 15 minutes. Thus, a granular composition having an average diameter of 1.1mm was obtained. The granular composition was added to an aqueous solution of 6.5kg of calcium chloride in 16.0kg of water and dissolved at 75 ℃ for 1 hour. Then filtered through a 60 mesh screen and the filtrate removed. 15.0kg of water were added twice to the residual mass at 70 ℃ and rinsed, after which it was dried at 90 ℃ with a fluidized bed dryer.
Finally, 23.8kg of a granular composite molecular sieve composition (water content: 4.1% by weight) was obtained. The physical properties of the composition are shown in the following table.
Comparative example 1:
9.9kg of zeolite powder type 4A was added to 25.0kg of an aqueous calcium chloride solution containing 18% by weight of calcium chloride and stirred at 70 ℃ for 2 hours to effect ion exchange. After filtration and washing, dry spraying was carried out at 120 ℃ to obtain 10.0kg of zeolite 5A type. The pretreated zeolite type 5A, 7.5kg of activated carbon powder and 7.5kg of magnesium silicate powder were added to a plowshare mixer and mixed for 6 minutes. The prepared solution, in which 2.5kg of syrup was added to 5.0kg of water, was injected into the mixture by a spray nozzle for 1-3 minutes, and treated for 30 minutes. Thus, 24.2kg of a granular composition having an average diameter of 1.5mm was obtained.
The composition was dried at 120 ℃ for 3 hours with a conventional type dryer and calcined at 650 ℃ for 2 hours under nitrogen atmosphere. Thereby producing a particulate composite molecular sieve composition. The physical properties of the compositions are shown in the following table.
Comparative example 2:
example 2 was conducted in the same manner as in comparative example 1, except that calcium silicate was used instead of magnesium silicate. The physical properties of the compositions are shown in the following table.
Comparative example 3:
10kg of zeolite powder type 5A, which was treated in the same manner as in comparative example 1, 7.5kg of activated carbon powder and 7.5kg of magnesium silicate powder were put into a plowshare mixer and mixed for 6 minutes. A solution prepared by mixing 2.0kg of syrup with 4.9kg of water was injected into the mixture through a nozzle for 30 minutes. This gave a granular composition having an average diameter of 1.1 mm.
The composition was injected by spraying through a nozzle a solution prepared by mixing 0.5kg of syrup and 0.13kg of water, so that the surface of the granular composition was coated.
The remaining steps were carried out in the same manner as in comparative example 1. The physical properties of the compositions are shown in the following table.
Comparative example 4:
example 4 was conducted in the same manner as in comparative example 1, except that bentonite was used instead of the magnesium silicate powder and sugar was used instead of the syrup, respectively. The physical properties of the compositions are shown in the following table.
Table:note: (1) ratio ofThe surface area sample is fully degassed at about 350 ℃, and then nitrogen adsorption is obtained at the temperature of liquid nitrogenTemperature line, calculating specific surface area from BET equation.
(2) Adsorption capacity of iodine
After the aqueous iodine solution was added to the sample, it was sucked into the sample, and then the liquid was separated by filtration. Starch solution was added to the filtrate as an indicator. The amount of iodine adsorbed in the sample was calculated from the concentration of iodine in the filtrate by titration with sodium thiosulfate.
(3) Decolorizing capability on methylene blue
An aqueous methylene blue solution was added to the sample, which was then shaken and filtered. The chromaticity of the filtrate was compared with that of a standard methylene blue solution, and the decoloring ability of methylene blue was calculated from the required amount of methylene blue when the filtrate color was consistent with that of the standard methylene blue solution.
(4) Wear resistance
A1 kg sample was added to an attrition-attrition tester and rotated at 60 rpm for 30 minutes and sieved through a 100 mesh standard sieve. The weight (w) of the dispersed particles was obtained and the abrasion resistance was calculated from the following equation.
Abrasion resistance (%) - (1-w). times.100
Claims (4)
1. A method for preparing a multifunctional granular composite molecular sieve composition is characterized by comprising the following steps: an aqueous alkali metal silicate solution is sprayed into a mixture of zeolite and activated carbon powder, granulated, then treated with an aqueous alkaline earth metal salt solution without calcination, and dried.
2. The process of claim 1 wherein the zeolite is form 4A.
3. The method according to claim 1, wherein the aqueous alkali metal silicate solution contains 15 to 38% by weight of sodium silicate.
4. The process according to claim 1, wherein said aqueous alkaline earth metal salt solution contains 10 to 45% by weight of calcium chloride.
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| Application Number | Priority Date | Filing Date | Title |
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| CN96123200A CN1105598C (en) | 1996-12-27 | 1996-12-27 | Manufacturing method of granulated complex molecular sieve composition having multi-functions |
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| CN96123200A CN1105598C (en) | 1996-12-27 | 1996-12-27 | Manufacturing method of granulated complex molecular sieve composition having multi-functions |
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| CN1185991A CN1185991A (en) | 1998-07-01 |
| CN1105598C true CN1105598C (en) | 2003-04-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101585563B (en) * | 2009-06-06 | 2011-06-22 | 吕安平 | New composite water purifying agent and a preparation method thereof |
| CN102806074A (en) * | 2011-06-01 | 2012-12-05 | 张跟满 | Manufacturing method of natural deodorant |
| CN104307472B (en) * | 2014-10-17 | 2016-05-11 | 甘成模 | A kind of for cigarette filter modified molecular screen and preparation method |
| CN109248708A (en) * | 2017-07-15 | 2019-01-22 | 吴月兵 | A kind of room temperature antichlor and preparation method thereof |
| CN108129339B (en) * | 2018-01-12 | 2020-05-12 | 河北华旭化工有限公司 | Decolorizing agent for producing L-phenylglycine |
| CN108191687B (en) * | 2018-01-12 | 2020-05-12 | 河北华旭化工有限公司 | Process for decoloring L-phenylglycine |
| CN113713760A (en) * | 2020-11-24 | 2021-11-30 | 宁夏银建卡奔活性炭有限公司 | Special carbon for efficiently adsorbing automobile exhaust |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59227701A (en) * | 1983-06-09 | 1984-12-21 | Nippon Denshi Zairyo Kk | Method for selective concentration and separative purification of hydrogen gas |
| JPH041039A (en) * | 1990-04-18 | 1992-01-06 | Toyobo Co Ltd | Coated polyester film and metallized film using the same |
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1996
- 1996-12-27 CN CN96123200A patent/CN1105598C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59227701A (en) * | 1983-06-09 | 1984-12-21 | Nippon Denshi Zairyo Kk | Method for selective concentration and separative purification of hydrogen gas |
| JPH041039A (en) * | 1990-04-18 | 1992-01-06 | Toyobo Co Ltd | Coated polyester film and metallized film using the same |
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| CN1185991A (en) | 1998-07-01 |
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