| 摘要 |
<p>A method and apparatus for optimizing the production of p-xylene from a feed stream of a mixture of xylene isomers and ethylbenzene is described. The feed stream (121) is first fed through a pretreatment reactor (120) which converts the ethylbenzene into benzene and light hydrocarbons which are removed from the feed stream. The resulting mixture of xylenes is fed into a isomerization unit (114) which enriches the p-xylene concentration in the mixture at the expense of the ortho and meta isomers. The resulting effluent (116) is fed into a separator (112), which separates out the p-xylene (113). The remainder is combined with additional mixed xylenes which are then fed back into the isomerization unit (114), thus providing a continuous process for removing ethylbenzene from the initial feed stream of ethylbenzene and mixed xylenes, and converting the mixed xylenes into p-xylene.</p> |
