Method for separating high-purity ethylcyclohexane from hydrogenated naphtha

Abstract

The invention discloses a method for separating high-purity ethylcyclohexane from hydrogenated naphtha, which comprises the following steps: introducing a hydrogenated naphtha raw material into an aromatic hydrocarbon removal tower filled with an aromatic hydrocarbon adsorbent, and deeply removing aromatic hydrocarbon in the raw material; the dearomatization raw material is introduced into a light component removal rectifying tower, and a light component C8 + fraction is obtained in a tower kettle; the C8 < + > fraction is introduced into a heavy component removal rectifying tower, and a C8 fraction is obtained at the tower top; introducing the C8 fraction into a simulated moving bed, and carrying out high-efficiency adsorption separation on ethyl cyclohexane to obtain an ethyl-rich cyclohexane component and an ethyl-poor cyclohexane component; and introducing the ethyl-rich cyclohexane component into a rectifying tower, and separating the ethyl cyclohexane from the desorption agent to obtain an ethyl cyclohexane product with the purity of more than or equal to 99.5%. Through fixed bed adsorption, precise rectification and simulated moving bed adsorption separation processes, an ethylcyclohexane product with a high additional value can be obtained, and the additional value of a hydrogenated naphtha raw material is improved.

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