Industrial Air Solutions, Inc.

Criterion catalyst co. case study


Courtesy of Industrial Air Solutions, Inc.

Criterion is the world's largest supplier of catalysis for hydroprocessing, including hydrotreating applications.  The company is also a leading supplier of reforming and specialty catalysis for the refining industry.

Criterion's facility in Azusa, CA installed a Tri-NOx Mult-Chem scrubber with a 3000 cfm capacity at 250 lbs/hr of NOx. The system has four polypropylene columns, three of which form the scrubbing portion of the system and use Tri-Packs column packing.  A stainless steel quenching column with internal spray heads cools catalyst process off-gases from 500 to 150° F.

The scrubber uses an irreversible process involving proprietary solutions and chemistries.  Residence time of NOx is minimal, based on the high NOx loading relative to the NO/NO2 ratio.

The system operates at greater than 99% efficiency on both NO and NO2 and the stack is clean. No harmful liquid byproducts are generated by the system: the only liquid effluent contains a small amount of soluble salt that is processed by the facility's waste treatment system.

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