Design and Application of Process-anticorrosion Technology in PTA Dryer

PTA dryer suffered from serious localized corrosion on stainless steel shell liner due to the existence of acetic acid and bromine process in PTA slurry medium. In order to inhibit corrosion, a kind of heating-device had been designed on the basis of technics-anticorrosion principle, which increased the shell temperature, and changed the inner temperature distribution to avoid forming dew point corrosion, so the corrosion in special shell section was reduced. After a circulate period, the corrosion of dryer shell had been visibly improved. This case becomes a successful ensample in process corrosion prevention.