【摘要】 为了得到聚合物级纯度的乙烯，工业上通常采用低温高压精馏方式去除共存的乙烷等杂质，这种分离过程的能耗非常大.基于多孔材料的吸附分离技术，因其绿色节能的优点受到了广泛关注.目前已见报道的绝大多数多孔材料，对乙烯吸附能力要强于乙烷，随之而来的额外解吸过程和吸附剂用量大等问题增加了纯化成本.相比之下，优先吸附乙烷的多孔材料成为更为理想的吸附剂.文中通过替换中心金属，得到了两种同构多孔金属有机框架材料Qc-5-Cu-dia和Qc-5-Ni-dia,并探究了其分离纯化乙烷/乙烯的行为.其中，Qc-5-Ni-dia在室温下的乙烷吸附量达到了2.6 mmol/g,乙烷/乙烯吸附选择比达到了2.3,说明该材料在乙烷/乙烯分离纯化中的巨大潜能.更多还原

【Abstract】 In order to obtain polymer-grade pure ethylene, the industry uses low-temperature and high-pressure distillation to remove ethane impurities. This process is energy-intensive and has a low energy utilization rate. Adsorption separation technology based on porous materials has received much attention for its green and energy-saving advantages. Most of the materials reported so far exhibit preferential adsorption of ethylene, and the additional resolution process and high adsorbent dosage further increase the purification costs. In contrast, porous materials that preferentially adsorb ethane are more desirable adsorbents. In this paper, two metal-organic framework materials, Qc-5-Cu-dia and Qc-5-Ni-dia, are reported for ethane/ethylene separation and purification. By replacing the central metal, two isostructural porous adsorbent materials were obtained, in which Qc-5-Ni-dia showed preferential adsorption of ethane, reaching 2.6 mmol/g at room temperature. Ideal adsorption solution theory(IAST) calculations show that Qc-5-Ni-dia has an ethane/ethylene adsorption selectivity ratio of 2.3, illustrating the great potential of this material for ethane/ethylene separation and purification.更多还原