Catalysts

Front-end acetylene conversion involves the hydrogenation of acetylene prior to the removal of methane and lighter components from the cracked gas stream. Back-end conversion restricts the materials entering the acetylene converter so that essentially only ethane, ethylene, acetylene and possibly some carbon monoxide are allowed through.

Chevron Phillips Chemical provides several formulations under the E-Series® catalysts designation by acetylene converter type:
 

Front End Deethanizer Catalyst

The high selectivity and stability of E-Series® catalysts can improve reactor control and ethylene quality, allowing the operator to meet extremely low acetylene levels in the reactor effluent. This allows reduced acetylene converter downtime and off-spec production without sacrificing production stability.
 
 

Front End Depropanizer Catalyst

E-Series® catalysts quantitatively remove acetylene while severely limiting the amount of over-hydrogenation of ethylene to ethane.  This enhanced selectivity can result in an increase of an ethylene plant's capacity, leading to an improvement in plant profitability.
 
 

Front End Raw Gas Catalyst

Our catalysts provide superior selectivity and stabilized reactor operations compared to traditional palladium and palladium/silver catalysts. To achieve optimum performance, E-Series® catalysts are custom-formulated to meet the requirements of their associated ethylene plant configurations.
 
 

Why E-Series® Catalysts

 

E-Series® catalysts provide the following benefits:

  • Excellent Selectivity - E-Series® catalysts quantitatively remove acetylene while severely limiting the amount of over-hydrogenation of ethylene to ethane.  This enhanced selectivity can result in an increase of an ethylene plant's capacity, leading to an improvement in plant profitability.
  • Stable Reactor Operations - E-Series® catalysts are much more stable when operating at the higher conversions
    necessary to achieve a tighter ethylene specification.  Reducing reaction temperature excursions can eliminate unplanned reactor shutdowns and minimize off-specification ethylene production.  Since runaway reactions can lead to reduced catalyst performance, E-Series® catalysts may exhibit longer catalyst lifetimes.
  • Resistance to CO Changes - Reactors operated with E-Series® catalyst are highly resistant to temperature excursions due to fluctuations in carbon monoxide content in the feed.  Changes in carbon monoxide levels with traditional catalysts can often lead to off-spec production and/or temperature runaway conditions.  For example, following the decoking of a furnace, an operator can easily adjust the temperature of the acetylene reactor containing E-Series® catalysts to accommodate changes in the carbon monoxide content of the feed.  This allows the reactor to be operated with little or no off-spec production.
  • Ease of Reactor Startup - Using E-Series® catalyst enables a quicker startup while minimizing off-spec production compared to traditional catalysts.
  • Ease of Use - E-Series® catalysts can easily be regenerated by either ex- or in-situ methods.  The high crush strength of these catalysts enables them to maintain their integrity through multiple handlings.
  • Safety - The widely enhanced operating window of E-Series® catalysts dramatically reduces undesired hydrogenation reactions.  The reactor operates more smoothly and temperature excursions or "runaway" reactions are less likely, resulting in improved reactor safety.


For more information, please contact us.