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Toluene conversion, %



Paraxylene, wt%


11.5 ­ 12.0
aromatics, wt%


14.0 ­ 15.0

Benzene/Xylenes (mole)


1.18 ­ 1.21

Standalone installation of the GT-STDP can be combined with crystallization to recover
high-purity paraxylene. Crystallization is the most efficient way to recover paraxylene from
the high-concentration streams. In addition to the reaction and crystallization equipment, a
distillation train (to recover the benzene, toluene, and paraxylene-rich stream) is required.

A consistent way to measure and compare the various technologies is to use a cash cost
of production (CCOP) based on a set of assumed feedstock and product prices, along
with a capital investment for the construction. The cash cost of production incorporates
the basic production costs of feedstock, utilities, and by-product credits, without
considering depreciation or capital charges. Based on a standalone application of GT-
STDP, the production and investment economics are presented below:

- Production & Investment Costs - 200,000 MTA paraxylene

Production costs ($/ton paraxylene)

Toluene requirement
460,000 MTA

Raw material costs
$ 780
By-product credits
$ (515)
Utility costs
$ 85
Fixed costs
$ 15

Cash Costs
$ 365

Total Investment cost
U.S.$ 75 MM

2000 USGC ISBL; includes reaction, distillation, and crystallization

- Toluene Alkylation

In the GT-TolAlk process, toluene is alkylated with methanol to produce paraxylene at a
very high selectivity (>85 wt%) on a proprietary high-silica zeolite catalyst. The reaction is
conducted in the presence of hydrogen and water in a specific molar ratio in a fixed bed
catalytic reactor. The effluent from the reactor is cooled and directed to a product
separator and a stripper column. The stripper bottoms is fed to the product distillation
section for separation into the various aromatic fractions. Typical operating conditions for
the GT-TolAlk are shown below.

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