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.
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.