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Kolmetz.com - CMAI 2000 Joe (Page 6)

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Kolmetz.com - CMAI 2000 Joe
Extract Column
Finishing Column
Xylene
Column
Paraxylene
C
9+
Fresh
Mixed Xylenes
Raffinate Column
Light
aromatics
Adsorption
Chambers
Extract
To Xylene
Isomerization
Raffinate
Desorbent
Recycle from
Xylene Isom.

Figure 3. Adsorption process for paraxylene recovery

The para-depleted xylenes are routed to an isomerization unit, which re-establishes
thermodynamic equilibrium among the isomers. After this, the xylenes flow back to the
original C
8
/C
9
fractionator until they are recycled to extinction. There are advantages and
disadvantages of a system based on this design configuration.

Technology Review of Adsorption-Based Paraxylene Complex

Advantages
·
High per pass recovery of paraxylene, leading to lower recycles
·
Relative efficiency in concentrating the paraxylene


Disadvantages
·
High capital cost
·
Sensitive to C
9+
hydrocarbons in the feed
·
High deployment of expensive proprietary equipment and materials; long
lead time for procurement
·
Molecular sieve is fragile, expensive, easily poisoned
·
Relative inefficiency in purifying the final paraxylene product

For an adsorption-based unit producing 400,000 MTA paraxylene with xylenes feedstock,
the relevant performance parameters are listed in the table below:

Performance Parameters, Adsorption-Based System

CCOP, $/ton

$370

Investment
1

$170 MM

Xylenes feedstock required

475,000 MTA

Aromatic by-products
2

45,000 MTA

Other by-products
2

30,000 MTA

1
2000 USGC ISBL
2
No toluene or C
9
conversion unit; EB-dealkylation type of isom catalyst

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