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为回收利用 HDPE(高密度聚乙烯 )装置尾气中的 C2 H4,测定了 C2 H4、N2 在分子筛吸附剂上的吸附等温线 ,筛选出对 C2 H4具有良好吸附性能的 13X分子筛吸附剂。在小型动态吸附试验装置上 ,评价了 13X对 C2 H4- N2混合气的分离效果 ,考察吸附温度、原料气流速对穿透时间、吸附量及选择分离因数的影响 ,结果表明 :13X吸附剂对 C2 H4具有较好的选择吸附能力。在固定床吸附分离装置上进行了混合气回收 C2 H4试验 ,回收 C2 H4的体积分数超过 95 % ,回收率达 80 %以上。
In order to recover C2H4 in the tail gas of HDPE (high density polyethylene) plant, the adsorption isotherms of C2 H4 and N2 on molecular sieve adsorbents were determined, and 13X molecular sieve adsorbents with good adsorption properties on C2 H4 were screened out. The effect of 13X on the separation of C2H4-N2 mixture was evaluated on a small dynamic adsorption device. The effects of adsorption temperature, flow rate of feed gas on the breakthrough time, adsorption capacity and selective separation factor were investigated. The results showed that 13X adsorbent pairs C2 H4 has a better choice of adsorption capacity. In a fixed bed adsorption separation unit for C2H4 gas mixture recovery test, recovery of C2 H4 volume fraction of more than 95%, the recovery rate of 80% or more.