Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – Including organic component
Patent
1992-11-13
1994-01-11
Dees, Carl F.
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
Including organic component
502 60, B01J 2904, B01J 3702
Patent
active
052781127
ABSTRACT:
A process for impregnating zeolite with permanganate, such as potassium permanganate, and a product of such process. The process preferably includes the steps of dehydrating zeolite crystals to have about 5% moisture content, mixing the dehydrated zeolite crystals with solid permanganate (preferably potassium permanganate crystals), immersing the solid mixture in, or spraying the solid mixture with, water at about 190.degree. F. and mixing the resulting slurry, and then drying the mixed slurry to produce permanganate-impregnated zeolite crystals having about 15% moisture content. In other preferred embodiments, the inventive method includes the steps of impregnating zeolite with a quaternary ammonium cation (QAC) and then coating the impregnated zeolite with permanganate, or impregnating zeolite with permanganate and then coating the impregnated zeolite with a QAC. Either coating acts as a protective agent for the impregnating substance in each zeolite crystal's interior, and allows regulated time release control of the impregnating substance, thus permitting a controlled diffusion (or absorption) rate in applications in which the coated, impregnated zeolite is employed to absorb contaminants from air or water. Combinations of coated and uncoated zeolite crystals can be chosen to match specific environmental circumstances calculable by analysis of the air or water to be treated. Mixtures of coated and uncoated QAC-impregnated zeolite can be used to react with organics such as benzene, toluene, and xylene, and mixtures of coated and uncoated permanganate-impregnated zeolite can be used to react with hydrogen sulfide, acetone, ethylene glycols, formaldehyde, and other contaminants.
REFERENCES:
patent: 3049399 (1962-08-01), Gamson et al.
Material Safety Data Sheet (5 pages), Chemax, Inc. (Jan. 30, 1992).
Cadena, et al., Treatment of Waters Contaminated with BTX and Heavy Metals Using Tailored Zeolites, Feb. 1992, New Mexico Waste-Management Education and Research Consortium, Technical Completion Report (Project No. WERC-91-41), 22 pages.
Gao, et al., Use of Tailored Zeolites for Removal of Benzene and Toluene from Water, 45th Purdue Industrial Waste Conference Proceedings, pp. 509-515, Lewis Publishers, Inc. Chelsea, Mich., 1991.
Brochure entitled "Carusorb.RTM. 200," by Carus (1 page).
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