Công Nghệ Uop-parex

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Mình nghĩ bạn nên mở 1 topic thảo luận về công nghệ này cũng rất hay đó, hình như để sản xuất dầu gốc (Base Aromatics) phải ko bạn,

[bThe UOP Parex* process is an innovative adsorptive separation method for the recovery of

para-xylene from mixed xylenes. The term mixed xylenes refers to a mixture of C8 aromatic

isomers that includes ethylbenzene, para-xylene, meta-xylene, and ortho-xylene.

These isomers boil so closely together that separating them by conventional distillation is

not practical. The Parex process provides an efficient means of recovering para-xylene by

using a solid zeolitic adsorbent that is selective for para-xylene. Unlike conventional

chromatography, the Parex process simulates the countercurrent flow of a liquid feed over

a solid bed of adsorbent. Feed and products enter and leave the adsorbent bed continuously

at nearly constant compositions. This technique is sometimes referred to as simulated

moving-bed (SMB) separation.

In a modern aromatics complex (Fig. 2.6.1), the Parex unit is located downstream of

the xylene column and is integrated with a UOP Isomar* unit. The feed to the xylene column

consists of the C8
aromatics product from the CCR* Platforming* unit together

with the xylenes produced in the Tatoray unit. The C8 fraction from the overhead of the

xylene column is fed to the Parex unit, where high-purity para-xylene is recovered in the

extract. The Parex raffinate is then sent to the Isomar unit, where the other C8 aromatic isomers

are converted to additional para-xylene and recycled to the xylene column. A complete

description of the entire aromatics complex may be found in Chap. 2.1.

UOP Parex units are designed to recover more than 97 wt % of the para-xylene from

the feed in a single pass at a product purity of 99.9 wt % or better. The Parex design is

energy-efficient, mechanically simple, and highly reliable. On-stream factors for Parex

units typically exceed 95 percent.

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