Kolmetz.com CMAI 2000 Joe Page 2
- 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.
Figure 1. Typical STDP Process
Typical operating conditions for the GT-STDP are shown below.
390 - 400
4.0 - 4.5
Paraxylene selectivity, wt%
A comparison with other commercially available processes for selective toluene
disproportionation is shown below.