Addressing the corrosion caused by the catalyst carrier in the MTBE etherification reactor to the equipment itself
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In the etherification reactor for MTBE, acidic resins are used as catalyst carriers; once these resins are removed, they can cause corrosion to the equipment itself. It is desirable to have an anti-corrosion coating that can protect the inner walls of the equipment, while also being able to withstand the temperatures associated with steam purging； Or are there other ways to solve this problem?
1. The inner wall of the reactor is made of composite panels； 2. Prevent the reaction from overheating; the temperature at the reactor outlet must not exceed 95 degrees Celsius. 3. Reduce the alkaline substances and alkali metal ions in the carbon tetra compound raw material.
So far, no serious problems have been detected despite years of maintenance work; I personally think this is related to your steam purging
Currently, corrosion in MTBE plants is mainly concentrated in the methanol recovery system. In the reactors, we use stainless steel linings, and no significant corrosion has been observed. Corrosion of the internal components in the catalytic distillation towers is minimal, but we are gradually replacing those components with stainless steel ones. In methanol recovery systems, cation and anion resins are primarily used for corrosion control; the extraction water is first deacidified using these resins, and thereafter it enters the methanol recovery tower, which helps to increase the pH value of the extraction water. At present, the concentration of iron ions has been significantly reduced
If the phenomenon mentioned by the poster does occur, it is necessary to consider the material of the reactor itself; using composite panels or opting for stainless steel right from the start would be the best solution. Furthermore, it is to control the steam supply amount and flow rate during the initial purging phase.
The extraction water is first deacidified using resin, and after deacidification, it is sent to the methanol recovery tower. Could you provide the contact information for the technology company?
Most reactors these days are made of corrosion-resistant stainless steel; indeed, those using carbon steel in the early days faced equipment corrosion issues
Acid removal from the extraction water – manufacturers of MTBE catalysts generally have such facilities; Hebei Kairui
Does your methanol recovery system perform regular tower cleaning?
The methanol recovery system regularly replaces the extraction water. In 2016, a deacidification reactor was added to remove acids from the extraction water, keeping the pH between 6.5 and 7; the iron ion concentration was reduced from 15–20 to below 1 PPM. At present, tower washing is not carried out
Shandong Xunda’s process package, Feng at 15998599953