The pyrolysis gasoline produced by the steam cracker has, among others, two important characteristics that are
- a significant content in aromatics
- a resulting high octane number.
With the evolution of the gasoline pool requirements, an increasing part of the pyrolysis gasoline production has switched from a gasoline pool blending end use to aromatics production end use.
Whatever the configuration, the first treatment of the pyrolysis gasoline consists in a stabilization by hydrogenation of the diolefins and alkenyl aromatics compounds.
This is the object the Gasoline Hydrogenation Unit 1st stage, that GHU-1 stands for.
With more than 40 years experience in pygas process development and application, and over 60% of the market share, Axens has acquired a vast expertise that has led to a complete portfolio of pygas hydrogenation technologies that cover many different applications. A full line of high performance catalysts that meet most site-specific profitability requirements accompanies these technologies.
Besides naphtha based crackers for which the amount of pyrolysis gasoline production has for a long time already justified the implementation of GHU-1, the recent trend of mega crackers project using ethane as major feedstock has lead to new capacities to be processed, which characteristics appears to be very specific. Axens has followed this evolution and adapted the technology to continuously match the market requirements.
The first Axens pyrolysis gasoline hydrogenation unit started up in 1967. Since then, over 100 first-stage and over 70 second-stage units have been licensed.