The Influence of Si/Al ratio on the Aromatic Adsorption from Aromatic/Alkanes Mixture by BETA Zeolite

سال انتشار: 1388
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 2,323

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شناسه ملی سند علمی:

ICHEC06_011

تاریخ نمایه سازی: 1 مهر 1388

چکیده مقاله:

In this work, adsorption of benzene from benzene/n-hexane and benzene/n-heptane was studied by two types of H-BETA zeolite with Si/Al ratio 11.5 and 24.5. Benzene was adsorbed of these mixtures which have 0.5% up to 10% mole fraction of benzene by batch technique in ambient temperature, and benzene concentration in binary mixture was measured by gas chromatography (GC). H-BETA zeolite has active site in its surface, this active site which has charge of the electron interact with p electron in benzene causes the heat of adsorption to increase. Si/Al ratio detects the number of active site in zeolite surface. In the other hand, increased active sites in H-BETA zeolite decline entropy of adsorption. Therefore, free energy of mixing defines the potential of adsorption in H-BETA zeolite. As the results indicated in all mixtures, benzene was adsorbed better than n-hexane and n-heptane on H-BETA zeolite surface, and separation factors are rather than 20. H-BETA zeolite with Si/Al = 24.5 has separation factor higher than H-BETA zeolite with Si/Al= 11.5 in similar mixture. For example, the separation factor in benzene/n-hexane mixture for H-BETA zeolite with Si/Al = 24.5 is near 50, and for Si/Al =11.5 it is 20.

نویسندگان

Hossein Rezaei

Department of Chemical Engineering, Islamic Azad University-Quchan branch, Quchan, Iran

Mahdi Fathizadeh

Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran.

Manouchehr Nikazar

Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran.

H. Ali Tahmasebi

Department of Chemical Engineering, Islamic Azad University-Quchan branch, Quchan, Iran

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