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­ Typical Operating Conditions

Temperature (°C)
400 - 450

Pressure (kg/cm
1 - 5

WHSV (hr
1 - 2

Paraxylene selectivity,wt.%
80-90+ min.
As with the STDP process, standalone installation of the GT-TolAlk can be combined with
crystallization to recover high-purity paraxylene. Based on a standalone application of GT-
TolAlk, the production and investment economics are presented below:

- Production & Investment Costs - 200,000 MTA paraxylene

Production costs ($/ton paraxylene):

Toluene requirement
204,000 MTA

Methanol requirement
120,000 MTA

Raw material costs
$ 370
By-product credits
$ (80)
Utility costs
$ 60
Fixed costs
$ 10

Cash Costs
$ 360

Total Investment cost
U.S.$ 70 MM

2000 USGC ISBL; includes reaction, distillation, and crystallization

There are several advantages to this toluene-based route.
Firstly, the toluene requirement per ton of paraxylene can be reduced from around 2.5
to 1.0 (when compared to STDP).
A much cheaper, and most likely to be abundant in the extended future, methanol
feedstock is used to maximize the conversion of the aromatic molecule into the
desired paraxylene.
As importantly, for producers that do not desire benzene co-product due to
processing objectives or local market conditions, the GT-TolAlk process produces
negligible benzene.

Sensitivity of production costs to toluene pricing for standalone installations of the
methylation process are presented below (Figure 2).

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