Abstract: Y-type molecular sieves were used to remove cyclic olefin （dicyclopentadiene）from toluene in this research. The acidity of USY and HY molecular sieves were tested by NH3-Temperature- Programmed Desorption Analysis （TPD）. Batch experiments were carried out to investigate their adsorption properties and the temperature influence on the adsorption performance of USY. The results showed that the equilibrium adsorption capacity of USY was 1.68 times as high as that of HY，and when the temperature ranged from 30℃ to 50℃，the adsorption rate of USY tended to be much faster and a shorter time was needed to reach the adsorption equilibrium. The effects of the operation parameters such as adsorption temperature，velocity and initial concentration on the adsorption capability of USY zeolite were studied by fixed-bed experiments. The biggest breakthrough capacity of DCPD was obtained at the temperature of 80℃ and the velocity of 0.133h?1. Furthermore，a higher breakthrough adsorption capacity can be achieved with a relatively high concentration of the raw materials. USY zeolite also had a good performance for the refining of the industrial coking toluene and exhibits a great potential for the practical applications. The thermogravimetic analysis （TGA）revealed that USY had a stronger adsorption capacity for DCPD compared with toluene.

Key words: toluene, olefin, molecular sieves, adsorption, fixed-bed

摘要： 以Y型分子筛为吸附剂脱除甲苯中的环状烯烃化合物（二聚环戊二烯，DCPD）。采用NH3-TPD测试方法分析了USY和HY分子筛的酸性中心性质。通过间歇吸附实验考察了USY和HY分子筛对甲苯中DCPD的吸附脱除能力以及温度对USY分子筛吸附能力的影响，结果表明，USY分子筛的烯烃吸附量是HY分子筛的1.68倍；当温度由30℃升至50℃时，USY分子筛的吸附速率增大。采用固定床连续实验考察了温度、体积空速和原料中烯烃浓度对USY分子筛吸附效果的影响，当温度为80℃、空速为0.133h?1时，分子筛的穿透吸附量最大；分子筛处理具有较高初始浓度的原料时得到较高的穿透吸附量，且对工业焦化甲苯溶液的处理效果明显，具有较好的工业应用前景。TGA热重分析结果表明，USY分子筛对DCPD的选择性吸附能力强于甲苯。

关键词: 甲苯, 烯烃, 分子筛, 吸附, 固定床