A major breakthrough has been made in the study of ethylene ethane separation

China Chemical News reporter october 29 from Taiyuan University of Technology learned that the international top academic journal Science magazine on October 26 online published Taiyuan University of Technology as the first unit of research paper "metal organic framework with iron-peroxy anion bit for ethane / ethylene separation." The results not only realize the reversal of ethane-ethylene adsorption, but also produce high-efficiency ethane adsorbents, which can be separated from different concentrations of ethylene mixture in one step to obtain polymerized grade ethylene.
research results were completed under the leadership of Professor Li Jinping, Vice President of Taiyuan University of Technology and Professor of the School of Chemistry
Chemical
. Li Jinping in an interview with reporters, said that the level of ethylene production technology is an important symbol of a country's petrochemical development level. The industrial preparation of traditional ethylene is carried out through ethane high-temperature cracking, the product of which is a mixture of ethane and ethylene. Industrially, multi-step, multi-level low-temperature distillation separation technology is commonly used to separate the mixture to obtain industrial standard ethylene with a purity of more than 99.95%. This process requires a lot of energy, and about 75% of the cost of ethylene is used in this process.
Li Jinping's team used oxygen molecules to bind to unsaturated voids in Fe-MOF materials for the first time in the world, effectively blocking the π-bond interaction between unsaturated metal voids and ethylene, and significantly reducing ethylene adsorption. At the same time, the newly constructed Fe-O2 group can show a stronger adsorption affinity to ethane, and achieve the goal of adsorption of ethane stronger than ethylene, and achieve the goal of selective removal of impurities in ethylene. This result not only subtly reverses ethane-ethylene adsorption, but also produces the most efficient ethane selection adsorbent to date, allowing different concentrations of ethane ethylene mixtures to be separated in one step to obtain polymerized grade ethylene. What's more, this simple and ingenious idea is expected to be applied to other MOFs, opening up a new way for the selection of ethane ethylene separation adsorbents.
Li Jinping, the main highlight of the current study is the discovery of iron-hyperoxygenation point MOF adsorption capacity of ethane is stronger than ethylene. The second is to achieve an efficient separation of 99.99% purity of ethylene at room temperature. Their team has developed a new type of MOF material and found Fe-O2 adsorbable ethane activity based on diffraction of the nil powder and theoretical calculations. MOF is a hole structure through which ethylene and ethane molecules pass well, increasing the chance of adsorption.
in recent years, the ethylene industry is still in a period of rapid development, as the world's second largest producer of ethylene, China's ethylene production and yield has also been increasing, in 2017 China's ethylene production of 1.8463 million tons, the average yield of ethylene 32.9%. In the next few years, with the completion of large-scale new ethylene plants in China, coupled with the momentum of coal olefin production capacity construction, ethylene production capacity will be released centrally. Industry insiders said that the promotion and application of the research results will bring revolutionary impact on the development of China's ethylene industry.
。