SEPARATION OF ALKANES FROM NAPHTHA BY COUPLED ADSORPTION PROCESS OF 5A AND ZSM-5 ZEOLITES

Abstract

Abstract: To improve the utilization efficiency of naphtha in production of ethylene and aromatics, a continuous adsorption and separation process using 5A and ZSM-5 zeolites for separation of alkanes from naphtha was studied. The residue oil with removed n-alkanes by adsorption (abbreviated as de-alkanes oil) and the oil removed monomethyl isomeric paraffins (abbreviated as de-paraffin oil) were obtained, respectively. The alkane-rich component oil （abbreviated as desorption oil）was obtained by desorption from molecular sieves using nitrogen. The results showed that the mass fraction of normal alkanes, monomethyl isomeric alkanes and aromatics potential content in the de-paraffin oil were 0.1%, 3.8%, and 53.4%, respectively, which can be used as a high quality feedstock for catalytic reforming. The content of alkanes in desorption oil can reach over 84%, which can be used as a high quality feedstock for cracking to ethylene.

Key words: naphtha, absorption separation, ZSM-5 zeolite, monomethyl isoparaffin

CLC Number:

References

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