Benzene & Toluene
Figure 5. Optimized aromatics complex with toluene and
mixed xylenes-based paraxylene production
GTC markets the 2-stage paraxylene crystallization technology available through a non-exclusive licensing
agreement with Lyondell Chemical Company under the name CrystPX. GT-IsomPX
is a leading xylene
isomerization process available from IPCL and GTC.
A summary of production and investment economics for integrated production of
paraxylene based on the above configuration is shown below.
Integrated STDP with crystallization
Integrated TolAlk with crystallization
2000 USGC construction costs
3-yr average US contract feedstock and product prices
There are several advantages to this configuration for paraxylene production:
Mixed xylenes feed requirements can be reduced by up to 50% and replaced with
Aromatics complex can be designed for low benzene/paraxylene ratio because of
negligible benzene production in the methylation unit. This is an excellent choice for
producers that do not desire benzene co-product due to processing objectives or
local market conditions.