The acetic acid heater made from titanium is an important equipment in a PTA project. It consists of tube pass and shell pass. The medium of shell pass is mainly steam which heats up the materials in tube pass. The media of tube pass are acetic acid combined with noble gases, which are comparatively corrosive. The tube pass is generally made of small-diameter and thin-walled titanium Grade 2 tubes, which has exceptional corrosion resistance to acetic acid.