Adsorption and desorption characteristics of CF4 on fixed bed column

Abstract

Adsorption and desorption characteristics of CF 4 , which is considered a significant global warming compound, were experimentally investigated. Dynamic behavior of feed gas mixture of CF 4 and N 2 was observed by breakthrough curve. Effects of CF 4 concentrations in the feed gas were investigated, and three pressurization methods were compared. Desorption experiments were carried out using vacuum blowdown and purge. Desorption curves with various N 2 flow rates, feed compositions, and purge time were obtained. The enrichment factor was high for low concentration of CF 4 . However, the time required for complete desorption was independent of CF 4 concentration. In the operation of separate vacuum blowdown and purge steps, a short period of vacuum blowdown followed by the purge step was effective.

High throughput screening of pure silica zeolites for CF4 capture from electronics industry gas

“…Commonly employed techniques include condensation, membrane separation, and adsorption. 16 Adsorption technology, in particular, stands out for its high selectivity, regenerability, efficient separation of gas components, low energy consumption, and ease of operation. Hence, the selection of suitable adsorbents is crucial for developing highly efficient adsorption processes.…”

Separation of CF4/N2, C2F6/N2, and SF6/N2 Mixtures in Amorphous Activated Carbons Using Molecular Simulations

“…For example, the GWP (global warming potential) of PFCs is 6500−9200 times higher than that of carbon dioxide, and the lifetime of PFCs is 50−200 times longer than that of carbon dioxide. 1 Because of the chief impact of environmental concern (global climate change), the Clean Air Act regulations are being made to evaluate and reduce emissions of PFCs and SF 6 . Currently, recovery/recycle methods are the most available and cost-efficient ways for treating these gases from emissions of industrial processes.…”

“…Common technologies for recovery/ recycle of these gases are condensation, membrane separation, and adsorption. 1 Condensation needs high power consumption to liquefy the gases at very low temperature, while the surface of the membrane can be deteriorated or the pores can be plugged after a long time. Adsorption offers some recognized advantages, including relatively low energy consumption and excellent operability without maintenance for the long adsorbent lifetime.…”

“…However, PFCs and sulfur hexafluoride are among the most potent and longest-lasting type of greenhouse gases emitted by human activities because of their characteristics of strong infrared (IR) absorption and very long atmospheric lifetimes. For example, the GWP (global warming potential) of PFCs is 6500–9200 times higher than that of carbon dioxide, and the lifetime of PFCs is 50–200 times longer than that of carbon dioxide . Because of the chief impact of environmental concern (global climate change), the Clean Air Act regulations are being made to evaluate and reduce emissions of PFCs and SF 6 .…”

“…Currently, recovery/recycle methods are the most available and cost-efficient ways for treating these gases from emissions of industrial processes. Common technologies for recovery/recycle of these gases are condensation, membrane separation, and adsorption . Condensation needs high power consumption to liquefy the gases at very low temperature, while the surface of the membrane can be deteriorated or the pores can be plugged after a long time.…”