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Tranter Mini-Welded Plate Heat Exchanger as a caustic solution heater case history
Case History on Tranter Mini-Welded Plate Heat Exchanger lengthening service life as a caustic solution heater in HF-catalyzed alkylation. Download the .pdf

Withstanding Corrosive Attack Of Dissolved Hydrofluoric Acid In HF-Catalyzed Alkylation

The alkylation plant in a Mexican refinery uses the hydrofluoric acid catalysis process. A 10-ft-long (3-m) carbon steel shell & tube exchanger, used to heat caustic solution containing trace amounts of hydrofluoric acid with steam, was judged to:

  • Take up too much space
  • Require excessive steam consumption
  • Fail too frequently in both channels from corrosion damage
  • Pose a hazard to nearby people and equipment


Tranter's solution was a  Mini-Welded Plate Heat Exchanger with Monel 400 alloy plates. In use, the exchanger overcame the shell & tube exchanger's shortcomings:

  • The high efficiency of its dimpled plate heat exchange surfaces resulted in a length only one-third the length of the original S&T
  • The small size helped reduce the materials cost of the high alloy exchanger
  • The corrosion and leakage problems ceased

The unit continues to perform with no signs of corrosion or leakage.

Download the complete case history here.Tranter Mini-Welded Plate Heat Exchanger in alkylation plants

A Tranter Mini-Welded Plate Heat Exchanger made completely of Monel 400 alloy, can withstand the corrosive attack of caustic and traces of HF as a caustic heater in HF-catalyzed alkylation.