Parex
Parex :
(1) Para Extraction. A version of the Sorbex process, for selectively extracting p-xylene from mixtures of xylene isomers, ethylbenzene, and aliphatic hydrocarbons. The feedstock is usually a C8 stream from a catalytic reformer, mixed with a xylene stream from a xylene isomerization unit. The process is operated at 177ºC; the desorbent is usually p-diethylbenzene. The first commercial plant began operation in Germany in 1971; by 1992, 453 plants had been licensed worldwide. Not to be confused with Parex (2). (2) Paraffin Extraction. A process for separating linear aliphatic hydrocarbons from branched-chain and cyclic hydrocarbons by means of a zeolite 5A adsorbent. The products are desorbed with a mixture of steam and ammonia
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