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ESTRATTO DOCUMENTO

A D

ROMATICS AND ERIVATIVES

S P

ULFOLANE ROCESS

A

PPLICATION Sulfolane Process

The Sulfolane process com-

bines liquid-liquid extraction Raffinate To

Product Ejector

to Storage

with extractive distillation to Recovery

Column

recover high-purity aromatics Extractor

Feed

Surge

from hydrocarbon mixtures, Drum

such as reformed petroleum Steam

Stripper

naphtha (reformate), pyroly- Extract to Clay

Treaters in BT

Raffinate Solvent Frac. Unit

sis gasoline (pygas), or coke Wash Steam

Regenerator

Column

oven light oil (COLO). Steam

Contaminants that are the

most difficult to eliminate in

the extraction section are easi-

est to eliminate in the extrac-

tive distillation section and

vice-versa. This hybrid combi- integrated UOP aromatics complex, the Sulfolane unit

nation of techniques allows Sulfolane units to process is located downstream of the reformate splitter column.

feedstocks of much broader boiling range than would be -C fraction from the overhead of the reformate

The C

6 7

possible by either technique alone. A single Sulfolane splitter is fed to the Sulfolane unit. The aromatic extract

unit can be used for simultaneous recovery of high-purity from the Sulfolane unit is clay treated to remove trace

-C aromatics, with individual aromatic components

C

6 9 olefins, and individual benzene and toluene products

recovered downstream by simple fractionation. are recovered by simple fractionation. The paraffinic

raffinate from the Sulfolane unit is usually blended into

The Sulfolane process takes its name from the solvent the gasoline pool or used in aliphatic solvents.

used: tetrahydrothiophene 1, 1-dioxide, or “sulfolane.”

Sulfolane was developed as a solvent by Shell Oil Benzene must always be recovered by extraction or

Company in the early 1960s and is still the most effi- extractive distillation in order to meet purity specifica-

cient solvent available for the recovery of aromatics. tions for petrochemical applications. Toluene must be

Most extraction units can be made to operate at high extracted for direct use in petrochemical applications

purity and recovery by circulating more and more sol- and is usually extracted before being fed to a dealkyla-

vent. Because the sulfolane solvent exhibits higher tion or disproportionation unit for production of addi-

selectivity and capacity for aromatics than any other TM

tional benzene and xylenes. Modern CCR Platforming

commercial extraction solvent, Sulfolane units operate units operate at such high severity that the C + fraction

8

at the lowest available solvent-to-feed ratio for any of the reformate does not contain any significant

given reformate feedstock. Therefore, for reformate amount of nonaromatic impurities, and may be sent

applications, a Sulfolane unit is less expensive to build directly to the xylenes recovery section of the plant

and operate than any other type of extraction unit. + fraction of pygas

without extraction. However, the C

8

and COLO streams contains significant amounts of

A Sulfolane unit is usually incorporated within an nonaromatic impurities and therefore must be extracted

aromatics complex to recover high-purity benzene and before either being recovered as marketable mixed

toluene products from reformate. In a modern, fully xylenes or sent to xylene recovery.


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DETTAGLI
Corso di laurea: Corso di laurea in chimica industriale e tecnologie del packaging
SSD:
Università: Parma - Unipr
A.A.: 2007-2008

I contenuti di questa pagina costituiscono rielaborazioni personali del Publisher Atreyu di informazioni apprese con la frequenza delle lezioni di Chimica industriale II e studio autonomo di eventuali libri di riferimento in preparazione dell'esame finale o della tesi. Non devono intendersi come materiale ufficiale dell'università Parma - Unipr o del prof Moggi Pietro.

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