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Selective Dehydrogenation and Dealkylation Catalyst for Conversion of Pyrolysis Gas to Benzene


Pyrotol® is a catalyst developed for selective dehydrogenation and dealkylation of pyrolysis gas (pygas) to high-purity benzene. The Pyrotol process converts the C6 to C9 fraction of pyrolysis liquids obtained as a by-product of ethylene production. Compared to the Litol® process, Pyrotol achieves more hydrocracking of non-aromatics, and a comparable amount of hydrodealkylation, but offers less desulfurization. The catalyst provides high activity and selectivity at lower operating temperatures than thermal processes, thereby supporting the operational and commercial success of petrochemical producers. 

Our complete range of catalysts for dehydrogenation and dealkylation of aromatic hydrocarbons to benzene includes:
Pyrotol® for pyrolysis petrol to benzene 
Litol® for light oil to benzene 
Detol® for toluene to benzene  

Pyrotol, Litol and Detol technologies are exclusively licensed by our process partner, Lummus Technology, while the catalysts are solely produced and supplied by Clariant.
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  • High aromatic selectivity: Higher product rate for a given feedstock
  • Single step process: Eliminates need for separate hydrotreating steps to reduce olefin or sulfur content in feedstock; reduces cost
  • Lower operating temperature: Eliminates need for sulfur injections for metal passivation; Allows use of lower alloy metals
  • No coking in heat exchange system: Low maintenance costs; eliminates aromatics saturated solid waste material
  • High value product: Highest product purity exceeding 99.93 wt%


  • Single step process
  • Lower operating temperature than thermal processes
  • No coking in heat exchange system
  • Extremely high product purity
  • Feedstock flexibility 

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