Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1990-05-10
1991-07-02
Hruskoci, Peter
Liquid purification or separation
Processes
Ion exchange or selective sorption
210690, 210691, 210751, 210908, 210909, B01D 1508
Patent
active
050283383
ABSTRACT:
A process is disclosed for immobilizing environmentally noxious organic, particularly aromatic, substances by absorbing them on a layered clay mineral modified by exchange with a quaternary ammonium compound, thereby increasing the spacing between the layers and rendering the adsorption surfaces hydrophobic.
After adsorption of the organic compounds the spacing between the layers of the layered clay mineral is reduced by a layer spacing reducing agent, and subsequently the clay mineral containing the organic compounds is mixed with a hardenable inorganic binder and the whole is hardened.
A typical example of a modifying agent is a quanternary ammonium compound, and of a layer spacing reducing agent an alkaline substance, such as sodium hydroxide.
Typical clay minerals are chosen among the smectite minerals, tectosilicates and phyllosilicates; preferably montmorillonite clay is used.
The inorganic binder may be a calcium hydroxide compound or a calcium containing cement, preferably containing fly ash.
REFERENCES:
patent: 4028130 (1977-06-01), Webster et al.
patent: 4650590 (1987-03-01), Beall
patent: 4740488 (1988-04-01), Fogler et al.
Hruskoci Peter
Jaskiewicz Edmund M.
Pelt & Hooykaas
Shideler Krisanne
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