شماره ركورد كنفرانس :
5048
عنوان مقاله :
The Influence of Si/Al ratio on the Aromatic Adsorption from Aromatic/Alkanes Mixture by BETA Zeolite
Author/Authors :
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
كليدواژه :
BETA zeolite , Aromatic adsorption , Separation factor , Liquid mixture
عنوان كنفرانس :
ششمين كنگره بين المللي مهندسي شيمي
چكيده لاتين :
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.
