p-Xylene separation
| 원료 | Feed |
| 생산물 | p-Xylene separation |
| 적용 | A process for separating p-xylene from mixtures with other xylene isomers, ethylbenzene and non-aromatic hydrocarbons. The p-xylene is recovers at a purity in excess of 99.5%. The process typically recovers 95% of the p-xylene charged in a single pass, but recoveries in excess of 96% are possible.<br> The process can be operated to extract p-xylene in a once through operation from either a C8-aromatic mixture derived from extraction or from a C8-cut of reformate or pyrolysis gasoline from steam cracking. Alternatively, it can be operated in conjunction with xylene isomerization, such as UOP's Isomar process, to yield any required proportion of the C8-aromatic products as p-xylene. |
| 설명 | Description:
Para-xylene is recovered by continuous adsorption from the liquid phase in a fixed bed of solid adsorbent. The adsorbed p-xylene is then recovered from the adsorbent by washing it with a desorbent liquid having a boiling point different from that of any of the C8-aromatics. The products are separated from the desorbent by fractionation. The Parex process arrangement simulates continuous countercurrent flow of adsorbent and liquid, without actual movement of the solid adsorbent (the UOP Sorbex technique). The flow of feed and products to and from the bed is continuous. Operating conditions: Temperatures range between 250-400℉ with moderate pressures. Carbon steel is used throughout the plant. No refrigeration or conveyance of solids is required. |
