Typical Operating Conditions
400 - 450
1 - 5
1 - 2
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 ($/ton paraxylene):
Raw material costs
Total Investment cost
U.S.$ 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
As importantly, for producers that do not desire benzene co-product due to
processing objectives or local market conditions, the GT-TolAlk process produces
Sensitivity of production costs to toluene pricing for standalone installations of the
methylation process are presented below (Figure 2).