Natalia Chepel

The use of gas chromatography in determining the sorption capacity of the adsorbent

The study specifies the characteristics of adsorbents for their subsequent use in adsorbers that are intended to trap aromatics from the juice vapour at the temperature and vacuum concentration of juices and extracts of plant materials. The paper presents our findings on the specific sorption capacities for aromatics of activated carbon BAC-A and porous polymers, such as polisorb-1, polisorb-10 and GC tenax. The experimental studies employed the dynamic method of gas chromatography with the use of the flame ionization detector. The trace curve of the adsorbate substance in the chromatogram allowed plotting adsorption isotherms and, consequently, calculating the specific capacities of adsorbents for camphor and isoamylol, as well as revealing that polysorb-1 is selective to isoamylol, whereas tenax and BAC-A – to camphor. The experiment findings have proved the applicability of this method for different adsorbents intended for adsorption of substances in the gas phase. The obtained data on the sorption capacities of the selected adsorbents are essential to calculate adsorption systems for trapping aromatics during the concentration of juices and extracts.

THE METHOD OF DETERMINATION OF THE SORPTION CAPACITY OF ACTIVATED CARBON BY GAS CHROMATOGRAPHY

The article analyzes the possibility of gas chromatography use for determination of sorption capacity of adsorbents on the example of activated carbon BAC-A. The offered method provides the use of gas chromatograph with flame-ionizing detector and with nozzle geyser that is filled with studied adsorbent. At that the isotherms of absorption of substance are constructed by manifestation curve – desorption branch of substance peak on chromatogram. As a result the isotherms of absorption of isoamylol and camphor on activated carbon were constructed and the values of specific sorption capacity for these substances were calculated. This method allows receive fast and precisely the data about absorption characteristics of adsorbent and also adapt the conditions of the study using gas chromatography to the real conditions of adsorption of substances by studied adsorbent (temperature, adsorbent concentration in vapor phase and so on).