Basalt planar sorbents successfully were used for the uptake of acid gases, organic vapours and water vapours from the air or natural gas streams, respectively.
The adsorption active filters made of the porous basalt fibers have advantages in comparison to traditional granulated sorbents as they possess lower diffusion resistance and higher sorption ability Consecutive chemical leaching of the basalt fibers by hydrochloric acids was used in the development of porous active surface of the basalt fibers. New sorbents were prepared from non-porous basalt fibers by means of chemical leaching in two steps. The sorption properties of the basalt-based sorbents for 2-butanol were measured and the respective sorption capacities were determined. The nitrogen sorption method and the BET model were used for the determination of the sample specific surface area; the BJH calculation yields the pore size distribution. It was established, that the sorption capacity on the porous, chemically leached basalt fibers is comparable with natural zeolites and industrial silicogels. Methods of thermal analysis (such as thermogravimetry, differential thermal analysis and evolved gas detection), were used for the characterization of the sorbent. The temperature necessary for the regeneration of the basaltic porous felt is by 2000 lower than for natural zeolites. Consequently, the significant energy saving can be achieved in the industrial scale, when using in the sorption modules the active filters made of the chemically leached basalt fibers.
- I.N. Beckman, Moscow State University, Division of Radiochemistry