Investigation Of Removal Of Trace Amount Of C₂H₆by Adsorption Method

The rapid industrial development leads to the higher consumption of the world’s three major energy resources——coal, oil, and natural gas, and result in the badly serious air pollution. The "greenhouse effect" and "ozone depletion" caused by the excessive CO2emissions have become a serious world problem, which causes environmental pollution and a great waste of carbon resources, and then, the recovery of CO2shows much important.This present research focused on purification and recovery of CO2resource. With the improvement of the people’s living standard, the demand of CO2from beer, carbonated beverage and other food industry is reaching to a higher standard. In2006, China adopted a new standard of food grade CO2, and the corresponding standard exhibits higher, hence the more importance for the recovery of CO2. In this thesis, the issue is removal of trace amount of C2H6from CO2by adsorption method.In this study, Two kinds of standard gases provided by Dalian Guangming Chemical Research Institute——C2H6/N2and C2H6/CO2, were used to investigated the performance of the adsorbent for the adsorption of C2H6, the concentration of C2H6is100ppm. Using different types of selected adsorbent to adsorb the ethane from N2, we found that active-carbons exhibited a better performance. One of the ACs(HSAAC) in the study is made in our lab using coke, shows a high specific surface area(HAS). Study results showed better adsorptive selectivity of ethane as compared to that of CO2.In this study, core-based AC, coal-based AC and HSAAC are the main adsorbent for removal of C2H6from different gases resource. The investigation results proved that the adsorption is physical adsorption. With the increase of temperature, the breakthrough time become shorter and the adsorption capacity decreased. With the increase of flowing rate of the raw gas, and the increase of particle diameter of ACs, the breakthrough time shortened gradually, while the adsorption capacity showed little change, and they all exist the best value in under these two conditions. CO2showed the strong competition as compared to C2H6in removal of ethane by adsorption method, which decreased the adsorption capacity over these three ACs. The ACs modified by5%HC1shows hardly higher selectivity and exhibits the lower adsorption of C2H6.Characterization of these three activated carbon results show that the HSAAC exhibits a higher specific surface area of2238m2/g, coal-based AC and core AC show1092m2/g and 929.5m2/g, respectively. The adsorption capacity of HSAAC shows weaker than the other two, while it shows a higher selectivity. So a good ethane adsorbent should have both a high specific surface area, suitable pore size and surface chemical property.