吸附剂对多环芳烃吸附分离技术的研究

Study on adsorption and separation technology of polycyclic aromatic hydrocarbons by adsorbent

采用专用模板剂制备多环芳烃吸附剂,通过X射线衍射仪(XRD)、全自动比表面分析测试仪(BET)、程序升温化学吸附分析仪(NH_(3)-TPD)、吡啶吸附红外光谱仪(Py-IR)、扫描电镜和透射电镜测试仪(SEM/TEM)等表征方法对是否添加模板剂的吸附剂进行表征分析,并以模拟油品为原料,分别在固定床和模拟移动床吸附分离装置上,考察吸附剂的多环芳烃分离性能。结果表明,与未添加模板剂的吸附剂相比,添加模板剂的多环芳烃吸附剂平均孔径增加43.3%,微孔比表面积降低72.2%,微孔孔容降低87.5%,弱酸量提高31.2%,强酸量提高60%,多环芳烃/非芳烃相对分离度提高52.7%,多环芳烃解吸时间缩短41.4%,甲基萘饱和吸附容量提高14.6%。专用模板剂制备的多环芳烃吸附剂在模拟移动床装置上稳定运行30 d后,非芳烃产品的非芳烃质量分数>95%,多环芳烃产品的多环芳烃质量分数>95%。

Polycyclic aromatics adsorbent was prepared with special template,and characterized through X-ray diffractometer(XRD),automatic specifics surface analysis detector(BET),temperature programmed chemisorption analyzer(NH_(3)-TPD),pyridine adsorption infrared spectrometer(Py-IR),scanning electron microscope and transmission electron microscope testers(SEM/TEM)with or without template addition.Taking simulated oil as raw material,on fixed bed and simulated moving bed adsorption and separation device respectively,the separation performance of polycyclic aromatics was investigated.The experimental results showed that compared with adsorbents without template addition,the average pore size of adsorbents with template addition was increased by 43.3%,the microporous surface area was decreased by 72.2%,the microporous volume was decreased by 87.5%,the weak acid content was increased by 31.2%,the strong acid content was increased by 60%,the relative separation of polycyclic aromatic hydrocarbons/non aromatic hydrocarbons was increased by 52.7%,the desorption time of polycyclic aromatic hydrocarbons was decreased by 41.4%,and the saturated adsorption capacity of methyl naphthalene was increased by 14.6%.Polycyclic aromatic hydrocarbon adsorbents prepared using specialized templates operated stably for one month on simulated moving bed device,nonaromatic content of nonaromatic products was more than 95%,aromatics content of polycyclic aromatics products was more than 95%.