| With the rapid development of industry, the environmental pollution has become a serious world’s problem. And the excessive CO2is the main gas that caused the "greenhouse effect". The carbon dioxide emission of our country is the second largest in the world, but the utilization rate of carbon dioxide is less than1%. The purification and recovery of CO2is significant.The Utilization of carbon dioxide includes industrial grade CO2and food grade CO2. As a widely used food additives, the quality of CO2affects the health of consumers directly, so the demand of food grade CO2is higher. It requires the total hydrocarbon content is less than or equal to20parts per million (ppm) besides methane. The removal of ethane is very difficult and this paper is about the study of developing efficient adsorbents to remove trace amount of C2H6.Firstly, different kinds of adsorbents were investigated to find the best adsorbent on ethane adsorption performance. It provided a certain technical parameters for the industrial application. The paper shows that the high area, abundance of micropore, and a few mesopore and nonpolar surface that the activated carbon has are more conductive to the adsorption performance.Then, four methods were used to modify activated carbon, including acid and alkali alternating modification, oxidizing and reduction modification, and metal ions modification. The study found that the appropriate treatment concentration and time of acid-base, redox modification is advantageous to the adsorption of ethane.Lastly, the adsorption effects of different preparation conditions on the properties of activated carbon were investigated by using orthogonal design. It was found that the KOH/coke, activation temperature, activation time and the origin of petroleum coke affect the adsorption performance and yield. Choosing proper preparation technology is helpful to improve its adsorption performance. |
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