In order to better guide the design of industrial process for purification and recovery of VOCs

temperature swing adsorption (TSA) and temperature vacuum swing adsorption (TVSA) process for VOCs purification and recovery were studied systematically with activated carbon adsorbent. The adsorption and desorption behaviors of benzene on activated carbon in above two processes were investigated systematically. Effects of operating parameters on process performances were further analyzed

including as regeneration temperature

purging feed ratio and hot–cold purging ratio. The results showed that the increase of hot–cold purging ratio (HP/CP) could obtain the same regeneration effect as the increase of desorption temperature. Increasing the feed purge ratio without increasing the hot–cold purging ratio is not conducive to bed regeneration

because a large number of cold purge gases cannot utilize the residual heat of temperature wave

thus reducing the desorption effect of the cooling step on the bed. In addition

the vacuum step can enhance the regeneration ability of hot nitrogen to the bed at the same regeneration temperature

making the bed regeneration of TVSA process more thorough. Temperature in the middle and lower part of the bed in TVSA process was higher and the regeneration was more thorough. In conclusion

TVSA has more obvious advantages than TSA in terms of energy consumption

hot or cold purge volume and bed regeneration.