Study on adsorption and separation technology of polycyclic aromatic hydrocarbons by adsorbent
Polycyclic aromatics adsorbent was prepared with special template,and characterized through X-ray diffractom-eter(XRD),automatic specifics surface analysis detector(BET),temperature programmed chemisorption analyzer(NH3-TPD),pyridine adsorption infrared spectrometer(Py-IR),scanning electron microscope and transmission electron micro-scope testers(SEM/TEM)with or without template addition.Taking simulated oil as raw material,on fixed bed and simu-lated moving bed adsorption and separation device respectively,the separation performance of polycyclic aromatics was in-vestigated.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 mi-croporous volume was decreased by 87.5%,the weak acid content was increased by 31.2%,the strong acid content was in-creased 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 ca-pacity of methyl naphthalene was increased by 14.6% .Polycyclic aromatic hydrocarbon adsorbents prepared using special-ized templates operated stably for one month on simulated moving bed device,non-aromatic content of non-aromatic prod-ucts was more than 95%,aromatics content of polycyclic aromatics products was more than 95% .
special template agentpolycyclic aromaticsadsorption and separationsimulated moving bed
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