Patent ID: 8431763
Filing Date: 2013-04-30
Classification: C07C

Abstract:
1. A method for separating aromatic compounds using a simulated moving bed adsorptive chromatography, comprising: removing a non-aromatic compound from a mixture of aromatic compounds having 7 or less carbon atoms in a sulfolan step; fractionating benzene/toluene; fractionating an aromatic compound which separates aromatic compounds having 8 or more carbon atoms; selectively disproportinating toluene; transalkylating; separating para-xylene with a simulated moving bed para-xylene separation step; and isomerizing xylene; wherein, a resultant of the sulforan process is inputted to the benzene/toluene fractionation step, the toluene from the benzene/toluene fractionation step is inputted to the selective toluene disproportionation step and the transalkylation step, a resultant of the selective toluene disproportionation step is inputted again to the benzene/toluene fractionation step, resultants of the benzene/toluene fractionation step and the transalkylation step are inputted to the aromatic compound fractionation step, a xylene mixture from the aromatic compound fractionation step is inputted to the simulated moving bed para-xylene separation step, and the xylene mixture from the simulated moving bed para-xylene separation step is inputted to the xylene isomerization step, and wherein, the method further comprises a simulated moving bed xylene mixture pre-treatment step and an additional xylene isomerization step, wherein the simulated moving bed xylene mixture pre-treatment step is applied between the aromatic compound fractionation step and the simulated moving bed para-xylene separation step, and the xylene mixture from the simulated moving bed xylene mixture pre-treatment step is inputted to the additional xylene isomerization step.