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Para-xylene (1,4-dimethylbenzene) is produced by separating it from a mixture of C8 aromatic isomers and nonaromatic hydrocarbons. The Parex process, based on adsorption, recovers more than 96 percent of the para-xylene per pass while consuming less utility. The Parex process is operated by passing mixed xylene feed over a bed of adsorbent, which preferable retains para-xylene. The para-xylene is separated from the adsorbent by displacing it with desorbent. Thus, the separation is carried out in
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