Comparison of the Absorption and Desorption Characters of Activated Carbon Fiber and Granular Activated Carbon on Benzene, Toluene and Xylene Mixed Gas

The atmospheric pollution and indoor environment pollution generated from benzene, toluene and xylene (BTX) of widely used in paint and coating had been widely concerned with. Adsorption and recycling treatment technologies as effective means of pollution control and solvent recovery were still the research focus. To explore simple, low-energy consuming and easy-to-disseminate test means for evaluating absorption and regeneration performance of adsorption materials was in favour of their industrial applications and dissemination in indoor air cleansing. Based on the simple, low-energy consuming and easy-to-disseminate principle, the experiment used self-made glass adsorption tube to perform tube adsorption and thermal desorption, and to carry out comparative tests on desorption and regeneration characters of BTX mixture with Viscose-based activated carbon fiber (VACF) and Granular coconut-shell activated carbon (GAC) as the adsorptive material, in combination with the analysis of thermal desorption and gas chromatography. The results showed that under room temperature, the adsorption rate of VACF was much better than that of GAC, with the usage of VACF less than that of GAC. Under constant temperature 120 ℃ and nitrogen purge rate of 50mL/min, the VACF showed a superior desorption rate with Benzene and Toluene than GAC. Moreover, it showed a lower desorption rate of Xylene from VACF than that from GAC.