Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And additional al or si containing component
Patent
1998-08-14
2000-06-13
Dunn, Tom
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
And additional al or si containing component
502 63, 502416, 502417, B01J 2906
Patent
active
060749741
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of manufacturing granulated complex molecular sieve compositions having multi-functions, which can be used, for example, to remove harmful gases that are emitted from cigarettes or as a treatment agent in water purification. The present molecular sieve compositions also have a multi-adsorption capacity, an excellent anti-abrasion property and can be conveniently processed. In particular, the inventive method comprises granulating an alkali metal silicate aqueous solution with a mixture of zeolites of various types and active carbon powder, and treating the mixture with an aqueous solution of alkali earth metal salt without calcination and drying.
DESCRIPTION OF THE RELATED ART
Zeolite is a crystalline alumino silicate salt generally represented by the following formula (I).
wherein, M is a cation,
n is the cation valence,
w is the number of water molecules.
The rate of y/x usually has values of 1.about.5 depending upon the structure.
The minute pore diameter of approximately 3 to 10 .ANG., that is characteristic of most zeolites, results in molecular sieving properties. Zeolites are especially useful as a hydrophilic adsorbent, because they have a strong adsorption capacity with polar molecules such as water. In addition, their adsorption capacity is great even under low partial pressures and at high temperatures.
An active carbon is manufactured by a method comprising the carbonization of materials that include coconut husk, coal or wood. Activation is then carried out under a reduction atmosphere. The resulting active carbon has a granule, fragment or powder morphology, and a pore diameter of 1 to 100 nm, with most pores being below 2 nm. Active carbon is a hydrophobic adsorbent and has strong adsorption power with non-polar molecule. The specific surface area of the active carbon may exceed 1200 m.sup.2 /g.
To assist in the adsorption capacity of the hydrophilic adsorbent of zeolite and the hydrophobic adsorbent active carbon, methods of manufacturing such adsorbents having multi-functions have been recently reported. These methods include mixing zeolite and active carbon, combining active carbonization substance and substance of zeolite type, and mixing a silicate compound and active carbon.
For example, Japanese non-examination patent sho 54-53669 discloses a method of manufacturing a composition for ozon degradation by adding bentonite and sugar to a mixture of zeolite and active carbon, which is then formed, dried and calcined. This method uses a natural clay such as bentonite as an inorganic binder. Consequently, the final product includes adulterated impurities. In addition, because the natural clay binder is a water-insoluble compound, its plasticity becomes low when it is mixed with water. To form a desired pattern, therefore, its plasticity must be maintained by adding water-soluble compounds such as polymers as an organic binder. Furthermore, due to the swelling of bentonite in water, the composition readily dissolves in water. To prevent the composition from dissolving and to carbonize sugar as an organic binder, a drying process and a calcination process under reduction atmosphere is required.
Therefore, this method needs complex calcination equipment which results in enormous costs. This method also produces dust, because of the contraction of bentonite during calcination, which leads to a decrease in the anti-abrasion capability and in the adsorption capability (because of the decrease in specific surface area) of the product. Use of an organic binder also necessarily results in contamination to the atmosphere from the volatile oils that are produced during the carbonization of the organic binder. Accordingly, this method requires a system to remove such contaminative substances.
Japanese non-examination Patent Pyong 4-4039 discloses a method of manufacturing a wastewater treatment agent using oil-adsorption capability by adding blast furnace slag powder to zeolite. This method gives rise to ecological safety problem of u
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Japanese Non-Examination Patent Sho 54-53669 dated Apr. 27, 1979.
Jeong Soon-Yong
Jin Hang-Kyo
Kim Jong-An
Kim Si-Wang
Lee Jung-Min
Dunn Tom
Korea Research Institute of Chemical Technology
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