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Kolmetz.com - CMAI 2000 Joe
GT-STDP
SM
- Selective Toluene Disproportionation

In the GT-STDP process, toluene is converted to paraxylene-rich (typically >80 wt%)
mixed xylenes and benzene at toluene conversion rates of around 30%. The process is
based on a proprietary high-silica zeolite catalyst. The process flow scheme is typical of a
toluene-conversion process and consists of a vapor-phase reactor, associated heat-
exchange, and product stabilization equipment.
Product
Distillation
Reactor
Heater
H2 Makeup
Toluene
Toluene Recycle
Offgas
Stripper
P-Xylene Concentrate
C9+Aromatics
Light
Hydrocarbons
Benzene
Product
Separator
Hydrogen Recycle

Figure 1. Typical STDP Process

Typical operating conditions for the GT-STDP are shown below.


Temperature (░C)
=
390 - 400

Pressure (kg/cm
2
)
=
30

WHSV (hr
-1
)
=
4.0 - 4.5

Toluene conversion
=
28-30% (typ.)

Paraxylene selectivity, wt%
=
80-90


A comparison with other commercially available processes for selective toluene
disproportionation is shown below.

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