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NOx and Acid Gas Removal for Batch Reactor Vent System | Case Study

Initial Challenge / Problem

Treat reactor vent gas containing NOx and trace mercury vapor from batch operations.

Industry of Client  Waste disposal / chemical processing
Type of Pollutants NOx (primary), Hg vapor (trace), HNO₃, HCl, NOCl, Cl₂
Material 316L stainless steel
Design Features – Skid-mounted system (tower, pump, blower, sump)
–  pH control system; air dilution valve and rainhat

 

Project Location

Deer Park, Texas, USA

Scale of operation

Batch reactor operation (4 times per day, intermittent venting)

Equipment type used (specific scrubber/packing model)

Standalone Caustic Scrubber (FRPS-12), Fiberglass tower with PP packing and internals

Flow rates

164 ACFM reactor vent (design request); ~61 CFM (~438.7 lb/hr) design basis

Removal efficiency rates

99.9% for HNO₃, HCl, NOCl, Cl₂; 40% for NO₂

Installation timeline

12–14 weeks after purchase order

Integration with existing systems

Reactor vent system with nitrogen purge between batches

Special considerations

Batch operation; mercury vapor allowed to pass through; customer handles waste liquid disposal

Pollution reduction percentages

Up to 99.9% removal for acid gases

Mufaddal Motiwala

Mufaddal Motiwala

Position

is the Engineering Manager and founder of MACH Engineering, LLC, which he established in 2005 to provide specialized engineering and mass transfer products to the petrochemical industry. With over 25 years of experience in chemical engineering and process design, Mufaddal graduated from the University of Houston with degrees in Chemical Engineering and Computer Science. Prior to founding MACH Engineering, he spent 11 years at Jaeger Products, Inc. as a process engineer, designing internals for scrubbers, air strippers, and distillation columns. Under his leadership, MACH Engineering has built a reputation for delivering high-level personalized service and innovative solutions for complex industrial applications. Mufaddal's expertise spans process simulation, vessel fabrication, packing systems, and mass transfer products, with a particular focus on critical facility operations in the petrochemical sector. His commitment to customer satisfaction and attention to detail has helped establish MACH Engineering as a trusted partner in industrial process solutions.

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