An aromatics complex is a combination of process units that can be used to convert petroleum naphtha and pyrolysis gasoline feedstocks into the basic petrochemical intermediates such as benzene, toluene, and xylene (BTX).


Para-xylene separation process

The para-xylene separation process is the key process of a para-xylene production plant. Recently, adsorption processes are being applied worldwide, and the main licensors of these adsorption processes are UOP, AXENS and TORAY. TOYO has experience of design and/or construction of all these licensed processes. TOYO has also 3 (three) experiences of design and/or construction of transalkylation process which converts low value C9 aromatic hydrocarbons to xylenes

Separation process of an aromatics complex

The feedstock naphtha is first hydrotreated to remove sulfur and nitrogen compounds and transferred to the catalytic reforming unit, where the treated naphtha is converted to aromatics. The reformate from the catalytic reformer is sent to reformate splitter column. The C7- fraction is sent to the aromatics extraction unit for benzene and toluene separation together with the pygas feedstock. The toluene is fed to the transalkylation unit with C9- streams for additional benzene and xylene. The C8+ stream from the toluene column bottoms is sent to xylene column. The C8+ fraction from the reformate splitter is sent to xylene splitter, which overhead mixed xylene stream is transferred to para-xylene separation unit and produce high purity para-xylene. The raffinate from the para-xylene separation unit is sent to the isomerization unit where additional para-xylene is produced by equibrium reaction. The effluent from the isomerization unit is recycled to the xylene separation unit. If o-Xylene is produced in the complex, the xylene splitter bottoms is sent to o-xylene column and high purity o-xylene is produced.

Aromatics complex block flow

Aromatics complex block flow


Since TOYO constructed its first aromatics complex, in Japan, in 1975, TOYO has designed and/or constructed ten(10) aromatics complexes throughout the world. The total capacity of para-xylene production and its rate, as designed and/or constructed by TOYO, corresponds to 2,604,000 t/y and this figure is about 19% of the worldwide para-xylene production capacity.

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