关键词: 乙烷, 二氧化碳, 活性炭, 吸附

Abstract: The removal of ethane from food grade CO2 is the bottleneck in the food processing industry. This paper focused on finding the best adsorbent for ethane from food grade CO2 and the optimal adsorption conditions. Molecular sieve，coconut shell，coal based activated carbon，and resin were selected as the adsorbents. Activated carbon was modified using different methods，including hydrochloric acid and sodium hydroxide alkali modification，hydrogen peroxide oxidizing and ammonia reduction modification. The results showed that the activated carbon performed well in the CO2 adsorption at high specific surface area，abundance of micropores，a few mesopores and nonpolar surface were more conductive to the adsorption performance. Activated carbon impregnated by a concentration of 1% hydrochloric acid solution for 3 hours adsorbed more ethane. The best condition of the alkaline solution modified activated carbon was at the concentration of 3% and absorption time of 6 hours. Weak oxidant modification could increase the ethane adsorption to a certain point. Weak reducer modification did not have obvious effects on the adsorption of ethane.

Key words: ethane, carbon dioxide, activated carbon, adsorption